2007 July Water System Master Plan
Section 3 Water Demand
Projections
INTRODUCTION
projected future water Water demand are based on land development and demand for the District water This section addresses the historical population projections production assumptions used for projecting potable water demands and methodology used for developing potable water This section describes the historical
demand
In this
projections
consumption including
water
section
production projections
water
as
well
demand refers
for water water any unaccounted
as
to
the
the total
amount
of
water
losses
POTABLE WATER DEMANDS Iistarical Water Production and t
Consumption
production and consumption for the period 1992 through 2005 is shown on 1 The average annual water production in this period Figure 3 varies with the highest production occurring in 2003 2002 3 175 acre ftlyr and the lowest the historical annual consumption in 199 1997 2 3 shows production 534 acre 2 ftlyr Figure The historical
water
Table 3 1 and illustrated in
per service connection for the District significantly over the last ten years
The
consumption
per service connection does not vary
Table 3 1 Summary of Water Production and Consumation
Year
Consumption
Water Loss
ftlyr acre
ftlyr acre
ftiyr acre
2 9 10 963 2
2 4 48 636 2
462
16
328
11
2 7 95 897 2 782 2
2 5 00 646 2 449 2
295
11
2 5 34 680 2 776 2
Production
y i
93 1992 1993194 1994195 1995196 97 1996 9 1997 1998199 1999100 01 2000 2001102 2002103 2003104 2004105
9
333
12
2 3 01 416 2 637 2
233
9
264
10
139
5
2 8 23 003 3 175 3
2 6 14 751 2 792 2
209
7
Connections
ftr t2 acre
8 3 27 347 8 378 8
2 7 99 806 2 816 2 820 2
3 1 23 121 3
8 3 93 410 8 442 8 8 4 95 556 8 640 8
8
383
12
2 7 60 838 2
362
12
736 85 8 927 8
9
352 9
283
Maximum
175 3
838 2
Minimum
534 2
301 2
139
MWH
Trended Production
252
462
1 2
percent
251
Note h roquctlon anq
Active Service
Water Loss
16 5
2 8 26 836 2 853 2 2 8 74 901 2 933 2 2 9 74 997 2
352 9
3 1 39 139 3
327 8
799 2
s site web Gonsumptlon statistics obtained from the Uistnct
Represents
Fiscal Year
Production linearized
over
13 years
Page
1 3
Section 3 Water Demand
Figure Summary
Projections
1 3
of Water Production and
Consumption
500 3 Y
3 000 2 500
i
I
4v
2 000 1
500
i
d
000 1 500
a
a a
0
w
I
1993
1995
1999
1997
2001
2003
2005
Time in Years
Water Production
Summary
of
Water Consumption
2 Figure 3 Average Consumption
mmw
Water Loss
per Service Connection
36 0 30 0 24 j 0
d
cC
18 I 0
12 0 06 0 00 1 0 1993
1995
1997
1999
2001
2003
2005
Time in Years
Consumption
MWH
per Service Connection
Page
2 3
Projections
Section 3 Water Demand
Water for unaccounted Tile difference between
water
for water unaccounted
or
and
production loss
water
consumption billed
Relevant
water
to
customers
is defined
loss statistics for the District s
as
water
for water may be attributed to leaking pipes 1 Unaccounted system is presented in Table 3 unmetered or unauthorized water use inaccurate meters or other events causing water to be withdrawn from the system and not measured
overflows hydrant flushing
Specific events that cause water lass include tank cleaning system flushing and hre fighting The average
street
the last 13 years is 10 percent Water are typically less than 10 percent and many have losses of less than 5 water percent annually The District is currently implementing systel the Capital Replacement Program CRP under which sections of pipes with leak history are annual
loss for the District s water system losses r fc well and maintained systems operated water
This would help reduce the
being replaced Historical
Peaking
baseline for
a
and
ADD to estimate MDD and PHD to
size
production 1995
to
water
data
2005
are
are
factor of 1 8 is
conservative
computing peaking
peak hour demand
PHD
factors
factors
These estimated MDD and PHD
The maximum
day
used to scale up the the demand conditions
are
are
distribution system pipelines and facilities Historical monthly and daily used to calculate these peaking factors The historical MDD factors far years 2 The MDD peaking factors MDD ADD varied presented in Table 3
between 1 26 and 1 80 with
peaking
loss for the District
Factors
Average day demand ADD is demand MDD peaking factor used
water
over
the second
an
the last 10 years It is observed that the 1998 compared to other years on record In order to be
6 average of 1
over
unusually high ADD highest MDD
factor of 1 74 will be used for
of the
sizing
facilities Table 3 2
Historical Year
Note
Daily
Demands and Maximum
Day Peaking
ADD
mgd
ADD MDD
1995
50 2
10 4
64 1
1996
59 2
10 4
58 1
1997
48 2
12 3
26 1
1998
26 2
07 4
80 1
1999
39 2
03 4
69 1
2000
44 2
75 3
54 1
2001
57 2
20 4
64 1
2002
63 2
58 4
74 1
2003
82 2
35 4
54 1
2004
81 2
45 4
58 1
2005
79 2
58 4
Statistics
for
2000 1995
presented years Associates 2001 Statistics presented for years 2001 2005 Water
MDD
mgd
Factors
MDD for 2005
are
by Deparsectionent of is provided by the District staff
Systems
issued
are
obtained
obtained
from
the District sWater Master
64 1 Plan
Update John
tgan anti
from the Annual Report to the Drinking Water Program for Large
Health Services
All demands listed in Table 2 include water loss
MWH
Page
3
Section 3 Water Demand
Projections
Diurnal Curves
A diurnal ve cul
curve
represents the
average
hourly
shown below for the District s
demand fluctuation in
water
fluctuation of all the pressure zones combined was recorded far 2005 A system wide diurnal
a water
system represents the on
August 29 2005
curve
was
created by
system The diurnal
average when the
preparing
hourly highest an
demand demand
hourly
mass
using well production reservoir outflows and reservoir inflows This was created based s Supervisory Control an hourly production and tank level information obtained from the District and Data Acquisition SCADA system balance
he diurnal l
curve
generated using
the District s SCADA data had unrealistic variations
on a
This is because average pump flow data rather than instantaneous flaw data generate the diurnal curve In addition the assumption that the levels at Tank 30 and
system basis wide was
used
1 ank 33
to
are
physically
the
same
as
the level
at
Palomar reservoir is inaccurate
located far from each other and
thus
do not follow the
level pattern h1 order to average diurnal curve was to
derive
a new
diurnal
District demand variation patterns This adjusted curve accurately capture the s Figure 3 As shown on Figure 3 the peak hour occurs around the thirteenth
that would
is shown
on
hour of the
day
that has
a
demand of 1 81 times the average demand far that
Figure 3 Adjusted System wide Diurnal
MWH
are
same
atwo running refine the inconsistencies in the diurnal curve hour created from the original SCADA data This curve was then adjusted curve
These three tanks
day
Curve
Page
4 3
Section 3 Water Demand
The diuz lal
is used to
curve
diurnal pattern
multiply the maximum day demand MDD for the hourly variation in demand
to account
Projections
in the model with the
PQPULATI4N
Existing Population 300 people existing year 2005 population of the District is estimated at approximately 21 This population is estimated based on the population projections prepared by the Southern The
California Association of Governments
SCAG 2004
far year 2005
Population Projections The District s service
area
contains the Town of Yucca
The
following assumptions estimates using SCAG population projections
unincorporated
areas
1
The entire
2
here are six Z
population census
s service District shown 3
area
4
on
For Tract
Figure 10403
in its
used far
entirety along
developing
future
with
some
population
of the Town of Yucca tracts
area
in San
These
Valley is served by the District Bernardino County that fall partially or fully
tracts are
within the
listed in Table 3 below and their locations
are
4 3 the
population
within
of tract within District s service
unincorporated
area to
total
area is
prorated
based
on a
ratio of
tract area
percent of the population within the Town of Yucca Valley is 10405 accounted for in the table below It is assumed that all of the unincorporated area in Tract Far Tract
10405
100
lies
outside District s
unincorporated 5
are
Valley
area
service
within District s service
10411
the table below s service District Tract 10412 is
this
tract
boundary
and thus
the
population
far this
is excluded
For Tract 10410 it is assumed that 100
i For Tract
area
percent of the developable land within this
tract
lies
area
100 percent of the population in the Town of Yucca Valley is accounted in It is assumed that the unincorporated area in this tract does not fall within area
fully
contained within the District s service
area
and 100 percent
population in
is accounted for in the table below
100 percent of the population within the Town of Yucca Valley is accounted in the table below It is assumed that the unincorporated area in this tract is For Tract
10413
outside the District s service
MWH
area
Page
5 3
Section 3 Water Demand
Population Projections by TractlD
2000
2005
Table 3 Census Tract for HDWD Service Area
2010
2020
2015
2025
2030
Population Population Population Population Population Population Population 580
10403
10410
10411
789
878
899
963
022 1
081 1
531
583
649
717
782
126
415
496 2
774 2
902 2
09T 3
335 3
542 3
743 3
608 5
086 6
279 6
331 6
450 6
568 6
681 6
071 6
231 6
384 6
531 6
10405
10412
617 5
780 5
10413
319 5
460 5
516 5
304 21
954 21
atal 1
Projections
746 19
848 5
Source Southern California Association of Governments ZUU4
As shown in the table and the
graph
an
905 5
062 6
214 6
533 23
295 24
032 25
741 5 722 22
Nopulauon rro ecuons
Figure 3 5
s current District
population will
increase
This represents a growth of about 17 percent over the next 300 21 000 25 2S years or about 0 7 percent annually Demand projections based on population are shown in able 3 T 4 below Tt is assumed that the demand will track population and also increase linearly from
at an
to
annual
in 2030
about
rate
of 0 7 percent 4 Table 3 Demand
Projection
based
Population
Year
on
Population ADD
mgd
79 2
2010
21 304 954 21
2015
722 22
98 2
2020
533 23
08 3
2025
295 24
18 3
2030
032 25
28 3
2005
88 2
scA 2ao4
2 Actual
vyH
2005 ADD based
on
s District records
Page
6 3
vice Area
racts
N
5000
0
5000
Feej
6 Figure 3 Year 2000 Census Tracts F
Section 3 Water Demand
Projections
5 Figure 3 Population Projections
As shown in Table based
4 the 3
ADD in 2030 is 3 28
This increase in demand and
mgd
SCAG data is very low The District has been adding five percent annually for fiscal years FY 2003 04and 2004J05 on
District
staff
commence
in
and the
knowledge
2007
annual
Due to this low
an
growth
rate
that for the purpose of this demands such as land use
of
growth
project
term demands short
are
rate
of 0 7 percent
Based
plomes
seems
on
population
at a rate
of about
discussions with the
development anticipated
to
low
population projections based on SCAG data it is recommended master plan other methodologies be used to project future water data
demands
at
calculated
discussed later in this section
as
by using general plan representative of the actual growth data is used
home Century 400
services
in
calculated
to
a
new
land
use
data
are
believed
to
For the purpose of this master
build
using
a
out
conditions
linear
growth
Future water demands
be
more
accurate
land
use
section
the
plan general plan
As discussed later in this
and
factor of 2 3 percent
WATER DEMAND PROJECTION METHODOLOGY Future water demands
development
planning
MWH
are
based
on
The District s CRP will
purposes
a
current water
help
water loss factor of 9
reduce the
consumption s system
water
water
percent corresponding
to
loss
the
loss
and
projected
but for conservative
most recent
2004105
Page
8 3
Section 3 Water Demand
Projections
projections Future water demands in the District are based on land use lation and water duty factors WDF To estimate the water consumption for a particular infort the WDF The WDF represents a area the surface area expressed in acres is multiplied by land use type For example the estimated typical water demand associated with a particular water acre commercial area with a WDF of 1 000 gpd acre is SO acres consumption of a 50 times 1 acre which equals 50 000 gpd or 35 gpm 000 gpd data is used for demand
Land Llse
and General Plan land
Existing
information for the District s service
use
area was
obtained from
SANBAG website in GIS format A summary of For planning categories is presented in the Appendix
s San Benlardino Association of Government the
and General Plan land
Existing
use
lumped together For example land Commercial use categories such as General Commercial Mixed Use Commercial Neighborhood 6 shows the land use etc are lumped into a single Commercial land use category Figure 3 5 lists s entire service area used for demand projections Table 3 categories within the District the lumped land use categories used for demand projection purposes land
Water
Duty
use
categories
are
Factors
WDFs for the different land
and
with similar characteristics
use
categories
demand which will
ultimately daily water use
are
account
developed
for
water
to
evaluate future
loss and
water
consumption
consumption
A WDF is the
per acre gpd acre of a given land use type Table s future water demands The method 5 shows the 11 WDFs used for projecting the District 3 used to derive the land use categories listed in the table below is discussed later in detail in this in
average
gallons
per
day
section udder Land Use 5 Table 3 Water Duty Factors Land
use
Abbreviation
T pe
Low
t2
acre d
COM
470
Industrial
IND
310
850
LDR
350
440
MDR
750
Density
h Densit
Residential Residential
Residential
Rural Low Densit Rural Ni
Planning WDF
Commercial
Medium Densit Hi
WDF Calculated acre pd
HDR
280 1
000 1
1 0 25 520 3
Residential
RURAL LD
130
130
Residential
RURAL HD
330
330
0
0
h Densit
Recreational O Non
en
S
ace
NROS ROS PARKS
280
280
Public Facilities
PUBLIG
800
800
Schools
SCHOOL
620
620
ParkslRecreational O
en
S
ace
1 wuhs computed based on global demand sampong 2WDFs used for projecting future demands
MWH
Page
9 3
Legend HDWD Service Area
Existing Land Use
Boundary
Vacant Parcels
Categories Commercial
High Density Residential Industrial Low
Density
Medium
Residential
Density Residential
Recreational Non
Open Space
ParkslRecreational
Aberdeen Dr
Open Space
O
Public Facilities
v
D
c
Rural
High Density
o
s
Rural Low
Mesa Dr
Density I
Schools
N
G7
o
a
ff
a
Vacant
aS Buena Vista Dr
4
Streets
P
l
D d
rns 29 Pa rns 29 pa
N Nv
D
Yucca Trl
Nom
0
o
Pueblo Trl
Onaga
Trl
Joshua Dr
Golden Bee Dr
San Andreas Rd N
4000
0
4000
Feet
Land
use
3 Figure 6 Categories used for Demand Projections
Section 3 Water Demand
Projections
by relating geoeoded spatially referenced billing data to sample areas for each land use type The total water consumption for the sample area divided by the area of the sample yields the WDF for that sample Thus WDFs are expressed in gpd acre The accuracy of this method is dependent on the number of samples collected and the were geographical distribution of these samples over the service area WDFs for the District water over the s District entire service area In this determined by global sampling of demands s service area is assigned a land use category method each geoeoded demand in the District The demands are then summarized by land use category and divided by the total area for each category As al the geoeoded demands as opposed to few samples are considered in the calculation of the WDFs this method of global sampling increases the accuracy of the process Water
duty
factors
are
calculated
planning demand projections a higher WDF is used for industrial and commercial 5 The total area land use types as compared to the calculated WDF This is shown in Table 3 not for these land use is covered during global sampling categories significantly large enough to Based on MWH s extensive planning compute accurate WDFs for planning purposes far communities with similar and land use a higher WDF is used for experience demographics projecting future water demands or fixture F
Based
on
the General Plan land use land
use
for residential HDR
parcels
with
density
a
of 8 tol4
for this land
samples planning experience these parcels were classified as MDR Similarly existing land use categories classified as Mixed Family Residential and High Density Trailer Parks were categorized as MDR Parcels Multi Based on classified as High Density Single Family Residential were categorized as LDR WDFs for and s planning experience the computed MWH Low Medium High Density Residential categories are low Table 3 6 explains the calculation of the revised WDFs for these categories which are used for planning purposes In addition it is assumed that the proposed residential developments will also have additional water usage for irrigation of front yards dwelling units per acre use category revealed
backyards
and
acre du
a
density
are
categorized
as
Several localized
of around 6 du acre Based
on
s MWH
common areas
Table 3 6 Residential WDFs
Land Use
Abbreviation
Type
Law Density
Personsldu
Planning capita Per
Average
consum
duJacre
ption
d
z F W acre gpd
CDR
55 2
5 1
115
440
MDR
55 2
5 3
115
025 1
HDR
55 2
0 12
115
520 3
Residential Medium
Density
Residential
High Density Residential 1
UwelOng Units persons per dwelimg urnt for the uistnct
2 Rounded
cities
MWH
Histoncai SGACi
data
developed by MWH for planning purposes for similar communities The WDFs proposed for the District are significantly lower than the other This is primarily due to very limited landscaping within the District The potable water
Table 3 7 desert
is based on
Values
provides
a
summary of WDFs
Page
11 3
Section 3 Water Demand
usage within the District is
front yard backyard
indaars with very minimal outdoor
mainly
Projections
usage Table 3 7
Comparison Cit
Barstow
HDWD WDF
Land Use
Type
WDF
ac Du
000 2
1 1 21 721 1
1 0 77 137 1
280
350 1
073 1
800
300 1
054 1
000 1
300 3
Industrial
850
Low
Density
Density
Residential Rural
a n
573 1
5 1
135 1
5 1
300 1
1
195 2
0 4
1 025
5 3
000 3
12 6
332 2
6
357 3
5 8
520 3
0 12
799 4
16
807 4
0 18
Residential
High Density Density
a n
an7 n
700
620
a n
047 2
nla
a n
a n
nla
a n
a n
a n
a n
a n
1
Residential SGI1001 Rural
Nigh Density
1 4 0
330
Residential Rural Low
Density
05 0
130
Residential
1 Indicates
that
term Lang The
their full
category was
not included in demand
vacant non
within the District with
remain the
Future
use
some
categories
water
that
within the District s service
The future
will
mainly
have not reached
in the
vacant
parcels
existing parcels For the purpose of demand vacant land use types within the District will non
existing
undergoing densification
occurs on
existing
vacant land will account for
demand within the District
in the District s
growth
area
occur
densification of the
in future while
development
increase in
parcels
land
it is assumed that the same
projections
Projections
development potential
projection
75 0
2 0
Demand
existing
ac Du
440
Residential Medium
ac Du
ac pd
Commercial
Public Facilities
WDF
ac pd
ac pd
S aceJRecreation
Bann in
Palmd ale WDF
ac Du
pdiac
Open
of WDFs
existing
land
use are
To
project
identified
the future
These
majority of growth and demands the vacant
water
vacant
parcels
are
assigned
a
land
type based on the General Plan Future water demands are calculated by multiplying the total area of each vacant parcel by its corresponding water duty factor Table 3 8 shows the use
s District
water
projected
demands
at
different
phases
this report there is only one major development Homes with 1 420 homes is in its planning phase
parcel
on
MWH
development is to development
which this
ciated with this ass
of
development
Mountain The future
be located has been
Vista
adjusted
writing
Project Century Vintage
water to
At the time of
demand for the 475
acre
reflect the actual demand
Page
12 3
Section 3 Water Demand
Projections
Table 3 8 Snmmarv of Prniected
Total Projected ADD Total
Projected
ADD
MUU values
are
obtained
d
m
m
67
percent
develo
d
93 5 values
by
muviHUVradar or
ment
percent
develo ment
93 6
41 3
py muttipry ngHun
100
percent
develo
ment
820 3
year ft acre
Total Pro ected MDD 1
33
of Vacant Parcels
Development
Demands
35 10
763 7
594 11
05 12
18 01
4
200 g Pm prajected ADD at build out condition is about 1035 mgd 7 This is little less than four times the existing ADD Based on a direct correlation between the 8 mgd and a population of 21 35 mgd build out demand translates 300 the 10 existing ADD of 2 rota a population of about 79 000 people at build out condition As shown in the
table
term Demand Short
the
Projection often years 200b 2015 The received from the District staff are used far
knowledge inputs developing these near term projections The major development expected to occur over next ten years will be a 1 420 home development by Century Vintage Homes Ill addition to this development there annual demand
projections of proposed developments
will be
few infill
a
are
developed for
and
projects
a
period
in the Town of Yucca
Valley
within the District s service
area
boundary It is assumed that the
phase starting
Century Vintage
Homes
development
will
occur
in
phases
with the first
construction in 2007 and first batch of names sold in 2008 It is also assumed that
2008 there will be about 200 homes said Based on this assumption all the names in the development will be complete occupied by the year 2015 The total prajected demand far Century Homes development is 0 437 mgd 487 acre yr as shown below in Table ft 9 This is based an an average of 2 3 55 persons per household based on historical SCAC data every year
anti 115
in
starting
gpd consumption
As spawn in Table
139 acre 3 yr feet aver
1 3
per person
the trended
water
production
in 2004 05 This rise in
water
rises from 2 799
production
reflects
93 to acre in 1992 feetlyr a 1 percent growth of 12
This low growth is largely attributed to the 93 percent annual growth 0 moratorium which expired in 2003104 Over the last couple of years the District has
13 years
or
building been experiencing
growth rate of about 5 percent It is unlikely that the District can sustain a percent annual growth rate an a long term basis Thus far the ten year projections rate a linear annual of 23 is used far the infill 20062015 percent growth projects This rate is exclusive of the Homes growth growth resulting from the Century Vintage development an
annual
5
9 The annual increase in system demands over the next ten year period is shown in Table 3 45 71 mgd and total MDD in 2015 is 6 According to this projection the total ADD in 2015 is 3
ingd
MWH
Page
13 3
Section 3 Water Demand
Projections
Table 3 9 term Annualized Demand Projections Shnrt Existin
Water Demand
Centu ADD
Homes
Total Demand
Infill Pro ects
d
m
65 2
00 0
00 0
65 2
2006
65 2
00 0
07 0
72 2
2 007
65 2
00 0
13 0
78 2
2008
65 2
05 0
19 0
89 2
2009
65 2
11 0
25 0
01 3
2010
65 2
16 0
31 0
13 3
2011
65 2
22 0
38 0
24 3
2012
65 2
27 0
44 0
36 3
2013
65 2
33 0
50 0
47 3
2014
65 2
38 0
56 0
59 3
2015
65 2
43 0
62 0
71 3
2005
61 4
00 0
00 0
61 4
2006
61 4
00 0
12 0
73 4
2007
61 4
00 0
22 0
84 4
2008
61 4
09 0
33 0
04 5
2009
61 4
19 0
44 0
24 5
2010 mYmmV
61 4
28 0
55 0
44 5
2011
61 4
38 0
65 0
64 5
2012
61 4
47 0
76 0
84 5
2013
61 4
57 0
87 0
05 6
2014
61 4
66 0
97 0
25 6
2015
61 4
76 0
08 1
45 6
2005 n
MDD
1j
Existing AUU is based
on
the
d
m
Ub reported production forZUU4
2 Existing MDD values are obtained by multiplying ADD values by MDDlADD factor of 3 Century Homes will develop at about 200 homes per year between 200 and 2015 3percent annually 4 Infill projects assumed to occur at 2
74 1
CONDLUSIONS Based the
on
the above discussions of historical
fallowing The
conclusions
existing
are
trended
demands peaking factors
and
projected demands
reached
ADD and MDD for the
District
are
80 2
mgd
and
mgd
87 4
respectively Based
on
historical MDD ADD
facilities in this
master
peaking factors
factor of 1 74 is used for
sizing
the
plan
The build out average day and maximum 01 mgd respectively mgd and 18
day
demands for the District
The term short average
day and
maximum
4 55 ft mgd 1 acre yr
and 6 45
mgd respectively
MWH
a
day
are
estimated
demand projections far the year 2015
at
10 35
are
Page
71 3
14 3
Section 4 Water Resources and
Supply
Assessment
INTRODUCTION
District existing and future potable water water supply sources in relation to future water demands It begins by describing the existing supply and the planning criteria Next future water supply needs are evaluated by comparing the available water supplies with the water demands under future demand conditions This section identifies the supply sources required to meet the projected average day demand ADD and the maximum day demand MDD through build out development Future water supply options are presented to identify those sources that best meet the water supply criteria This section then discussed the existing and future water quality regulations that affect the District It concludes with a water quality evaluation of the existing groundwater supplies and recommendations for This section discusses I4i Desert Water District s
future
supply development
OVERVIEW OF EXISTING WATER SUPPLY SYSTEM The IIi Desert Water District
currently
relies
groundwater supplemented by imparted of potable water The District currently extracts
on
State Water Project
local
SWP water as their source yr from their wells and has a maximum allocation ft acre SWP which is used to recharge the groundwater basin
104 approximately 3 fiom the
system consists of
ion
yr ft acre
plant at 14 boaster 16 26 booster reservoirs pumps agency inter connections storage emergency stations 21 pressure reducing valves and approximately 312 miles of pipeline The focus of this The
existing
watel
18
groundwater wells
of 4 282
one
exchange
treatment
exchange
nitrate removal
two
section will be Water from
on
the
water
nitrate high
supply components
Wells
12E and
7E is 1
treated
at
the ion
facility The facility has a capacity of 2 544 gpm and consists of a raw water balding tank 444 gal ion 62 exchange units a finished water tank 62 000 gal and booster pumps The treated water is blended with water from Well 16E in the finished water tank before being 640 gpm pumped into the system by two booster pumps with a combined capacity of about 1 The District also operates a blending facility 42 004 gal to blend water from Wells 9E and 14F Two booster pumps downstream of the blending tank with a combined capacity of 1 440 uz pump the water back into the g
system
WATER SUPPLY PLANNING CRITERIA The
supply planning
assessment
MWH
to
criteria
determine
outlines the
criteria used in the
whether the District
has sufficient
water resources water
supply
and
under
supply
existing
Page
1 4
Section 4 Water Resources and
demand
satisfy the projected potable water supply planning are conditions to
Meet the A DD
well
out build
Assessment
The evaluation criteria used for
out build
through
Meet the MDD
through
Supply
through
out with all build
wells
groundwater
excluding
the
largest
well
firm
capacity drinking water regulations
Meet the
WATER SUPPLY ANALYSIS
required to meet the water supply planning criteria It first discusses the District s existing water supply sources Next future water supply needs are computed by comparing the available water supplies with the water demands under future conditions Finally the future water supply sources subsection discusses water source options that might be available to the District his section identifies the T
Existing
Water
he District I
Warren
sources
Supply Sources
currently
Valley
Meatls Ames
supply
obtains
water
from three
Groundwater Basin
Valley Groundwater Basin SWP water through
State Water Project Fach of the three
sources
supply
sources
the
Morongo
Basin
Pipeline
is discussed further in this subsection
The District
00 acre 1 yr of groundwater to supply its ft currently pumps approximately 3 Warren The primary groundwater source is the Valley Basin which underlies the Yucca area in San Bernardino The District has pumping rights of 1 622 acre Valley County Warren as as of from the nearby well 800 acre ftlyr from the Valley Basin ftlyr pumping rights customers
Means Ames There
are
Basin
Valley
HDWD 2005d
differences in the
significant
groundwater
basin boundaries in the IIDWD service
area
among various agencies The California Department of Water Resources DWR published an updated version of California s Groundwater Bulletin 118 in 2003 This report includes
descriptions of groundwater basins throughout the state The Mojave Water Agency MWA prepared a regional water management plan in 1994 and updated that plan in 2004 The MWA report contains basin designation with significantly different boundaries than those published by DWR A third source of basin boundaries is local groundwater judgments and agreements A has been for the Warren developed Valley groundwater basin while a settlement judgment Means Valley groundwater basin The boundaries in agreement was approved for the Ames these documents boundaries
are
of the
groundwater rights
hydrogeology
MWH
of the
different from those of DWR and MWA
judgment
and
However
groundwater
agreement
since
they
information
from
Bulletin
form
This section the
118
basis is used
uses
for the to
the basin s District
describe
the
basins
Page
2 4
Section 4 Water Resources and
Supply
Assessment
groundwater wells 15 of which are located along Yucca Creek which two are located on the Mesa area which pump groundwater from the Warren Valley Basin and Four of these 18 wells are inactive hump groundwater from the Ames Basin HDWD 2005b s wells are summarized in Error Reference he physical and operational data of the District T source not found 57 mgd based The total capacity of all groundwater wells is 8 033 gpm or 11 17 on SCh 063 gpm or 10 pump tests The total capacity of the active wells is approximately 7 mgd The firm well capacity is defined as the combined capacity of all operational groundwater wells excluding the largest well With the largest well offline Well 12E with a capacity of 1 467 or 06 or 2 1 1 the firm well is 596 gpm mgd gpm mgd capacity 5 The District
awns
1
purchases SWP water from Mojave Water Agency MWA which is a SWP Beginning in 1995 the SWP water has been used to recharge the Warren Valley Basin after many years of overdraft The District has a maximum allotment of 4 yr of ft 282 acre discussed water from the State Water the Basin As Morongo imported Project through Pipeline later this source provides untreated water that is used for groundwater replenishment Consequently it is not included as part of the production capacity available to meet MDD The District also contractor
h
addition
the District
The District has
an
can
obtain
water
inter connections during emergencies through agency
emergency interne with the Joshua Basin Water District
transferred from the Joshua Basin Water District
temporary
pump and hose connections
connected
to
the
Desert Bighorn
only
le 4 Ta1 1
The District s
View Water District with are nat
considered
a as
pump
water
supply sources
be
system is also
but its
intertie
can
transfer via
through hydrant
the District
John Egan 2001
discontinued in 1996 These connections be used in
to
Water
as
use
was
these should
emergencies
s historical presents HDWD
water
supplies
for fiscal years 1993
through
2005
Table 4 1 Historical HDWD Water
Supplies
ftl acre Fiscal Year
Warren
BDVWA
Valley
Interne
Basin
Ames Means
Total
SWP
Recharge
Basin
316 2
593
0
910 2
0
1994
982 1
573
408
963 2
0
1995
713 1
497
585
795 2
340 1
1996
440 1
713
745
897 2
586 3
1997
955 1
124
703
782 2
776 4
1998
786 1
0
748
534 2
962 3
1999
40 1
0
840
680 2
211 2
2000
198 2
0
578
776 2
633 3
2001
168 2
0
656
823 2
891 3
2002
034 2
0
969
003 3
359 2
2003
721 2
0
454
175 3
987 2
2004
372 2
0
751
123 3
851 2
2005
341 2
0
781
121 3
996 3
1993
MWN
r
Page
3 4
Section 4 Water Resources and
Maximum
721 2
Minimum
440 1 067 2
Avera
e
Assessment
776 4
969
175 3
0
0
534 2
192
632
891 2
713
Supply
0
738 2
reu Valley Groundwater Wat The Warren
Valley
of 26 9 square miles 17 200 acres DWR 2004 to be 000 ft The basin is of the basin 568 acre storage capacity ft KJC 1991 Total usable storage capacity of approximately 160 000 acre Basin
covers
an area
DWR estimated that total
estimated annual
have
to
a
groundwater production
from the basin
was
g during 2 41 acre approximately 3
FY 2004
O5 The Warren
Valley on
Valley
Basin includes the
bearing water
surrounding area The basin is bounded by the bedrock outcrop of the Little San
and the
the south
bedrock constriction called the Yucca barrier and
on
sediments beneath the on
the north
Bernardino the
west
by
by
of Yucca
the Pinto Mountain fault the east
by
a
bedrock constriction and
a
Mountains a
town
on
The
praductive topographic divide between Warren Valley and Morongo Valley DWR 2004 to to consolidated Miocene materials in this basin consist of unconsolidated partly gearing water uatenzary interbedded
MWH
bearing deposits deposits The main productive water and silts deposited by alluvial fan systems gravels conglomerates
continental
are
unconfined
Page
4
Section 4 Water Resources and
Supply
Assessment
Table 4 2
Groundwater Well Characteristics SCE
Design No
Location
Status
Basin
Depth
Capacityy n C9P t
10W
Sunland Dr W of Miami Tr
Warren Valle
Active
020 1
220
11W
Cassia Dr
Warren Valle
Active
860
550
12E
Cassia Dr
Warren Valle
Active
800
200 1
District Yard
Warren Valle
Active
Warren
Valley
Active
Warren
Valley
Active
14E 16E
Sage Lea
17E
ue
Sage Lea
Ave South of Little
Pm
t t
251
1 0 17 467 1
700
658
270
219
400
380
270
269
378
100
96
X04
80
80
730
150
157
1 1 15 450 1
Dr
Ave South of Little ue
Pump
800
Dr Warren Valle
18E
Crestview Dr
2W
Pioneer Town Rd Sunland
Warren
Valley
Warren
Valley
Active
000 1
Active
Dr
3W
Off of Church St N of 29 Palms Hw Balsa Ave and Paxton Rd
Warren Valle
5W
5E
Luna Vista Ln
Warren Valle
6W
Co ate Tr
Warren Valle
Theatre Rd
Warren Valle
8W
Yucca Tr
Warren Valle
Active
9E
District Yard
Warren Valle
Active
Sunland Dr W of Cherokee
Warren
Active
7E
9W
Active
Active
Valley
90
90
757
425
428
c
700
700
250
238
800
400
357
990
800
837
Tr a
10E
Mesa Dr
24E
Warren Vista
Total Well
Capacity
Active
all
Capacity
System
535 6
063 7
for the
System
505 7
033 8
335 5
596 5
wells
Firm Well minus i
100 689
for the
active wells
Total Well
100 800
Capacity active largest well 12E
wells
Design capacities provided by the District obtained from SCE pump test points
2 Information
3 Design capacities Groundwater
used where SCE test
Adjudication
capacities
of Water
were
not available
Rights
The basin
began
to
be overdrafted in the 19SOs
KJC 1991 Concerned about significantly increasing the overdraft the District filed a complaint against the Yueea Water Company Ltd et al for adjudication of the groundwater in 1976 In 1977 the Superior Court for the County of San Bernardino issued its judgment for adjudication Although the native yield of the basin from precipitation and runoff does not exceed 200 acre yr the Court recognized the need to issue groundwater rights in excess of the ft s safe basin
resulting local economic growth could support the cast of a solution to the overdraft 3 Accordingly rights to the basin groundwater were issued as listed in Table 4 administer the of the the Court To provisions DVVD 2006a i adjudication judgment appointed the District as the Watermaster for the basin and ordered the Watermaster develop a physical lutian s
MWH
to
yield
so
that the
the overdraft
problem HDWD 2005e
Chilton Jerks Kennedy
was
hired
to
5 Page 4
Section 4 Water Resources and
fonzlulate the solution
adopted
on
the Warren
Valley tansan 2005 i
as
1991
May 10
Basin
Management Plan
Supply
Assessment
which the Watennaster
Table 4 3 Warren
to the
Party
Valley Groundwater Adjudication Pumping
ftlyr acre
Adjudication
Production
Average
ht
Ri
Between
20002005
ftr acre
Desert Water District Hi
896
Yucca Water Com
an
726
Blue Skies Countr
Club
585
268
80
14
Institute of Mental Ph sics 16 individuals for small domestic
16
uses
2 3 4
16
303 2
Total eulstnci r
1
391 2
acquired the Yucca water e ompany m
Assumed to be 1
ftlyr acre
per
producer
per
689 2
ayu
Not included in watermaster
judgment
report
HDWD 2005e Hanson 2005
Safe Yield The current average yield of the Warren Valley Basin is estimated to be 820 acre ftof natural recharge 820 acre yr which includes 80 acre ft yr of septic and irrigation return ft and 80
ftlyr acre
Natural
recharge
of subsurface outflow to
the basin is
mainly from
streamflow from Water
ephelnerai
Percolation of septic tank effluent
2004
As
growth
occurs
in the
Canyon
basin
the
to
the basin based
on
the Yucca Barrier
in the north and
significantly
contributes
amount
report it is assumed that 32 percent of the a u rett
Grady 2006 HDWD 2006a direct percolation of precipitation and percolation of
across
to
Covington Canyon in the south the recharge of groundwater DWR
of return flow is
groundwater pumped
the ratio of estimated
returns to
expected
to
increase For this
from the Warren
average
production
Valley
Basin
in the Warren
Valley Basin aesfMeans Ar
Valley
Groundwater Basins
section the AmesiMeans Valley Groundwater Basin includes portions of the Ames atad Copper Mountain Valley basins as designated by DWR The surface area of the Ames Valley Basin as defined in the Ames Valley Water Basin Agreement 1991 is approximately 900 acres The following basin descriptions are based on information in Bulletin ll8 DWR 49 2004 As used in this
7 square miles 1 0 000 acres The basin is Valley Basin covers an area of 169 rocks of the San Bernardino Mountains on the west Iron waterbearing bynon Ridge on the north and Hidalgo Mountain an the northeast The Emerson Copper Mountain and West Calico fault also form parts of the eastern and northern boundaries A surface water drainage divide with the Copper Mountain Valley Basin forms the southern boundary The total storage ft DWR 2004 200 acre 1 capacity is estimated to be 000 The Ames bounded
The
Copper
Mountain
basin is bounded
by
4 square miles 30 Valley Basin covers an area of 47 300 acres The on the north by a drainage divide with the Ames Valley Basin and on the south
the Pinto Mountain fault
MWN
The
non rocks waterbearing
of the
Copper
Mountain and the San
Page
S 4
Section 4 Water Resources and
Supply
Assessment
boundaries respectively excess of 000 ft DWR 2004 000 acre 1
Bernardino Mountains farm the eastern and western basin
storage In
capacity
is estimated in
The total
Development Company to locate and 500 acre yr ft capable of producing 1
1987 the District contracted with the Mainstream Water
develop
a
well outside the Warren
Valley
Basin that is
placed within the Sphere of Influence of the Desert View Water Agency one of the predecessors to the Bighorn Desert View Water Agency BDVWA A well Ames was successfully drilled in the 00 acre Valley Basin capable of producing up to 2 yr ft In 1989 environmental litigation with the BDVWA prevented the use of this well In 1991 a 5 rt settlemei ftlyr plus 0 agreement between the two parties allowed HDWD to extract 800 acre fttyr for each new residential meter installed after approval of the agreement The acre agreement provides that water pumped from the Ames Valley Basin can only be used to serve In 1993 Well 24E was put into operation HDWD 2006a customers within that basin informal Through agreement with BDVWA the District limits its pumping from the Means Valley to about 650 acre Ames yr until a recharge program is implemented ft The
proposed
State Water
well site
Project
was
Water Artificial
Recharge
largest water source for the Yucca Valley area SWP water is brought the area via the Morongo Basin Pipeline MBP a 54 million project mile pipeline beginning at the California Aqueduct in Hesperia The capacity consisting of a 71 of the pipeline provides for the delivery of excess water when available In June 1990 the voters thirds vote h1 approved the financing plan for the Morongo Basin Pipeline by more than atwo MBP SWP water the lanuary 1995 the District started importing through State Water
Project SWP
water
is the
to
Agency is one of the 29 SWP contractors It provides wholesale water to the Hi Desert Water District Desert Bighorn View Water Agency Joshua Basin Water District and Service Area No 70 Improvement Zones W 1 and W 4 MWA Ordinance No 9 U1ty Co included as Appendix C establishes the rules and regulations for the sale and delivery of SWP
Mojave
Water
water
In
1991 when the MWA anal
HDWD
signed
the MBP
Agreement
to allocate the water MWA
ftlyr Of this amount Improvement District M the 50 00 acre seventh or a 7 257 acre yr and the ft designated service area for the MBP was entitled to one District has a contractual allocation of 59 percent or 4 282 acre ftlyr I IDWD 2006x The had
a
SWP Table A amount of
provides that MWA may deliver additional SWP water to MBP project participants subject to project capacity The agreement defines the project peak delivery capacity as 15 cubic feet per second cfs or 10 900 acre ftlyr if operated continuously According to MWA the addition of a second pumping station along the pipeline has increased this capacity to 22 cfs 10 acre 9 15 yr if operated continuously MWA 2006 Based on this capacity it is possible ft I I DWD to obtain additional water for for groundwater storage if water is available from MWA agreement
000 acre acquired an additional Table A amount of 25 yr from Berrenda Mesa ft Water District a member agency of Kern County Water Agency increasing its total Table A anzoutit to 75 800 acre ftlyr According to the terms of the MBP Agreement this increased In
1998
Table A
MWA
amount
would
agencies Instead
MWH
not
increase the
amount
of
water
available for the MBP
the SWP allotment for the MBP would be based an the
contracting 50 acre original 800
Page
7 4
Section 4 Water Resources and
Supply Assessment
ftly Talale A amount but project participants may request additional water deliveries up to the r s capacity if MWA has not contracted with other water purveyors for this additional project water Ongoing discussions continue as to whether he District and others within Improvement District M are entitled to a proportionate share of the additional 25 000 acre ftlyr If this is resolved favorably the District s annual allotment could potentially be increased to 6 390 acre MWA on an a If not the District would be able to purchase additional SWP supplies from Itty available basis in accordance with MWA Ordinance No 9 as
Based have
on
DWR
operational
teen along
exports
to receive
studies
published
in
deliveries of SWP water
2005
average of 77 percent of the Table A
297 acre 3 ftlyr
on
average
amount
are
Consequently
expected
to
the District
HDWD 2006a
Pipeline Agreement continues until the earlier of i the date which all Bonds issued have been retired or full provision made for their retirement including interest until their retirement date or ii fifty 50 years The District estimate that the bonds will be paid off in 2023 but it could be earlier based on the current rate of population growth Whether the District will be able to secure firm SWP allocation beyond 2023 is unknown at this time The MBP Agreement states that water service would be subject to sopinion that sagency MWA wide policy for the sale of water in effect at that time It is MWA The
term
of 1991
Basin
Morongo
on
the District will have boundaries water to
in
The District has
the District
Appendix
D and
beyond
reliable
are
sources
SWP water with
all the other
confirmation from MWA of its
requested
is estimated
susceptible
According
to
reductions
to DWR
to
to
yield
an
are
their SWP
attached
E respectively
during drought
studies
and thus are
are
not
expected
HDWD this range 1992 the SWP supply period 1990 A contract amount or 1 113 acre yr ft
contract amount
average of26 percent of the Table
years
future Table A deliveries
100 percent of the Table A range from 5 percent would be 214 to 4 282 acre yr For the driest three year ft to
agencies within ability to supply
2023 The letter to MWA and the response from MWA
Appendix
SWP Table A deliveries
completely
compete for
to
For
signed a Conjunctive Use Agreement with MWA in 1994 that provided the tunity to import additional water through the MBP for recharge into the Warren Valley oppoz Basin The District was able to directly purchase the water stored in the basin by MWA hi ft of conjunctive use water In 2004 the District 500 acre 2001 the District paid for almost 1 and MWA re the negotiated Conjunctive Use Agreement to provide greater flexibility to both agencies Terms of the agreement include no agreement expiration no limit to the amount of water stored in the basin MWA is responsible for the cost of transporting the water to the recharge basins and the cost of water itself withdrawn from the banked water can begin only after the initial storage threshold of 2 ft is reached and the District will provide water 500 acre The District
Isom its SWP allocation if MWA requests a withdrawal Both agencies plan to store a total of 2012 HDWD 2006a 900 acreft of conjunctive use water in the basin between 2006 12 Water received
from
the MBP
is
recharged
into the
Warren
Valley
Basin
through
two
Valley percolation ponds owned and operated by HDWD These sites are located west DWR and of 247 and south of Drive 2005d 2004 Airl7art Highway Sunnyslope HDWD a yr Recharging the ft Historically these basins have combined recharge capacity of 5 000 acre near
MWH
the Yucca
Page
8 4
Section 4 Water Resources and
water
eliminates the need
to construct a treatment
biter Three additional basins will increase the total
plant
because
recently constructed 000 acre ftlyr recharge capacity to 11
east
were
Supply
percolation
Assessment
acts
of Pioneertown Road
as
a
natural
These basins
Future Water Demand
supply capacity must be sufficient to serve the projected water demands out with adequate redundancy for emergency conditions Table 4 shows the through build s projected water demands at different phases of development The methodology used IJistrict for developing these water demand projections is discussed in Section 3 The available
water
Table 4 Summary of Projected Demands Development of Vacant Total Projected ADD
m
Parcels d
Total Projected MDD are
obtained
m
percent
develo
80 2
Total Projected ADD acre ftr
1 MUU values
33
Current
d
ment
66 percent develo
41 3
137 3
93 6
820 3 93 5
87 4
meat
100
percent
develo
ment
35 10
763 7
594 11
05 12
18 01
AUU tactor of 14 by multiplying AUU values by MUU
Demand
projections aver the next five year period 2010 2006 for these is also discussed in methodology developing projections
are
5 The shown in Table 4
Section 3
Table 4 5 term Annual Demand Projections Near Water Demand
Existin
Homes
Centu ADD
m
Infill Pro ects
Total Demand
d
2005
65 2
00 0
00 0
65 2
2006
65 2
00 0
07 0
72 2
2007
65 2
00 0
13 0
78 2
65 2
05 0
19 0
89 2
2009
65 2
11 0
25 0
01 3
2010
65 2
16 0
31 0
13 3
2011
65 2
22 0
38 0
24 3
2012
65 2
27 0
44 0
36 3
2013
65 2
33 0
50 0
47 3
2014
65 2
38 0
56 0
59 3
2015
65 2
43 0
62 0
71 3
2008
MDDmd
MWH
2005
61 4
00 0
00 0
61 4
2006
61 4
00 0
12 0
73 4
2007
61 4
00 0
22 0
84 4
2008
61 4
09 0
33 0
04 5
2009
61 4
19 0
44 0
24 5
2010
61 4
28 0
55 0
44 5
2011
61 4
38 0
65 0
64 5
2012
61 4
47 0
76 0
84 5
2013
61 4
57 0
87 0
05 6
Page
9 4
Section 4 Water Resources and
mm rv
1
Supply
Assessment
2014
61 4
66 0
97 0
25 6
2015
61 4
76 0
08 1
45 6
m
EXISting ADU IS based on the reported prodUCtiOn torLUU41Ub ADD factor of 1 74 Existing MDD values are obtained by multiplying ADD values by MDD
2 3 Century Homes will develop at about 200 homes per year between 2008 3percent annually 4 Infill projects assumed to occur at 2
Comparison
of Demand and
hable 4 6lists the average
and 2015
Existing Supply
yield
maximum
capacity
and firm
supply capacity
for each
existing
water source
6 Table 4
Existing
Valley Valley
Imported
SWP Water
Net Water 1
Firm
Groundwater
capacity
r
Firm
Capacity an
d
Gapacity an
d
522
17 9
20 6
650
00 1
00 1
297 3
as
the
17 10
469 4
Supply Capacity is defined
Max
Yield
ftJ acre
Groundwater
AmeslMeans
Supply Summary
Average
Supply Source Warren
Water
groundwater production capacity
with me
20 7
nitrate treatment plant out or service
year average pumping by Average yield is based on the safe yield of the Warren Valley 820 acre yrless the recent five ft Blue Skies Country Glub 268 acre ftlyr Institute for Mental Physics 14 acre yrand minimal producers 16 acre ft yr ft Average yield is based on the existing agreed upon pumping from the AmeslMeans Valley The allowed pumping of the Means Valley is 800 acre Ames 5acre fttyr 0 yrper connection installed since January 1991 ft The is estimated to be 77 of the contractual Table A amount based on DWR studies DWR SWP 4 term average long supply 2005 No production capacity is included since this supply is used for groundwater recharge 2
compared with the projected ADD to identify a supply surplus or existing water supply is 4 469 acre ftlyr This is significantly than the ADD of the five which was 82 mgd 3 2 past 159 acre yr in ft greater highest years are 2003 section 2 Therefore it is concluded that the District s existing supplies adequate to The average yield is typically deficit The average annual
its
meet
basin
existing
reserves
demands
during
ui the Warren
an
Valley
average year with an surplus supply being used Due to the variabAlity of the SWP supply during
to
build
a
single
yr Under these conditions ft dry year SWP supplies could be reduced to as little as 214 acre and the difference would be made up through recovery of demands would exceed supplies
previously stored The firm meet
SWP water
supply capacity
is
projected MDD to verify the ability to groundwater capacity is defined as the combined out of service In this case the largest source is the
typically compared
with the
seasonal variations in demands The firm
capacity
of all wells with the
largest
source
6 mgd As shown in Table 4 G the 500 gpm or 3 plant capacity of 2 57 17 mgd while the existing firm supply capacity is 6 existing maximum supply capacity is 10 are MDD in the five which Both than the past greater highest experienced years mgd capacities was 4 58 mgd 5 yr in 2005 ft 130 acre nitrate
treatment
With this
supplies future
MWH
comparison
are
water
sufficient demands
with
a
of the demands and to meet are
the ADD
projected
to
as
supplies well
increase
as
it
can
be concluded that the
the MDD for the
significantly
as
water
term
I4awever the
earlier
To determine
near
presented
existing
Page
10 4
Section 4 Water Resources and
when floe District needs additional availalale
water
for the
supplies
ondition 1 Meet the ADD C
water
supplies
through
Condition 2 Meet the MDD
projected
demands
are
compared
with the
conditions
two
following
the
Assessment
Supply
out build out with build
through
largest
source
nitrate plant
out
of
service he supply and demand
comparisons
for each of these conditions
are
presented
in Table 7 4 and
Table 4 8
Condition 1 Meet ADD results of the evaluation
Table 4 7 shows the
evaluation several assumptions
Valley Basin
will increase
from
estimated
use
This is are
are
to
as
are
made
First
to
increased growth occurs due based on an yr ft acre average
returns
be 820
32 percent of the average remain at this percentage if no changes
ation uiader the allac
and demands
from
water
For this
yield of the Warren Currently returns
use use
of
yr ft 575 acre 2
in the past 13 years Returns from use occur in the current method of wastewater
water use
It is also assumed that other
disposal
supplies
it is assumed that the
to
approximately
assumed
of annual
judgment
of 615
producers
in the Warren
Valley
will
extract
their full
ftlyr acre 7 Table 4
Future Water Needs Evaluation Condition 1 Meet ADD Demand
Supplies acre yr ft Ames Warren
Year
Valle Yield
Means
SWP
Total
Valley
Water2
Supplies
956
650
2006
977
650
297 3
2007
994
650
297 3
2008
026 1
650
297 3
2009
060 1
650
297 3
2010
083 1
650
297 3
33 Uev
163 1
650
297 3
035 2
650
297 3
794 2
650
297 3
66
rev
lDev 100
Other DWD
Warren
297 3
otal
Valley
Basin
200 5
yr ft acre Surplus
4 deficit
968 2
615
583 3
320 1
924 4
046 3
615
661 3
263 1
941 4
114 3
615
729 3
212 1
973 4
237 3
615
852 3
121 1
007 5
371 3
615
986 3
021 1
030 5
506 3
615
121 4
909
110 5
820 3
615
435 4
675
gg2 5
763 7
615
378 8
396 2
741 6
594 11
615
209 12
468 5
903 4
2 3
valley yield is based on estimated returns rrom use of percent or appiieo water SWP supply available for HDWD is assumed to remain at 77 percent of the current allocation of 4 282 acre ftJyr Other Warren Valley pumping is based on the rights of Blue Skies Golf Course Institute of Mental Physics and private
4
pumpers Deficit shown
1
Warren
A second
represents
assumption
the difference between
supply
is that the estimated
increase consistent with
and
demand
production
from the Ames Means
Valley
Basin will
growth as defined in the Settlement Agreement Valley yr based on production in ft currently about 650 acre the past five years At full development the Ames Means Valley area will have a demand of S The Settlement allows the District to increase its pumping by O 478 acre 3 Agreement yr ft projected
Demand in the AmeslMeans
yr far ft acre
MWH
every
new
residential area
is
residential connection in this
area
Based
on
current
usage patterns
Page
11 4
Section 4 Water Resources and
growth
is
expected this
agreement
to result in about
would allow
the
200 7
maximum
Supply
Assessment
Under the
additional connections at build out
pumping
to
increase from
800
yr ft acre
to
400 acre approximately 4 ftlyr Since the agreement limits pumping to demand in the out An analysis AmeslMeans Valley the maximum pumping could be 3 478 acre yr at build ft of whether the available yield of the Ames Means Valley is adequate to support this level of not in the scope of this current investigation For this study it is assumed that the pumping is AmeslMeans Valley basin cannot support this level of use under current supply conditions ftlyr production is therefore limited to 650 acre
assumptions existing supplies are adequate to meet annual demands through 2010 However future development at about the 40 percent level and beyond shows a supply shortage under average conditions Additional water supplies would be needed to support out would be 5 468 acre yr ft th beyond the 40 percent level and the deficit at build grov Based
on
these
Condition 2 Meet MDD with the Firm Well
Capacity
Table 4 8 shows the results of the evaluation of maximum
day supplies
and demands
Far this
existing supplies are adequate to meet annual demands through 33 percent development However future development at the 66 percent level and beyond shows a supply shortage under maximum day conditions primarily due to a lack of pumping capacity of the existing wells New wells will need to be drilled to meet the peak demand As discussed under Condition 1 it is also due to a reduction in the safe yield of the Warren Valley Basin condition
additional
8 mgd is expected without Consequently a future supply deficit of up to 10 additional water sources production capacity would production capacity Without augmented when development approaches the 33 percent level
need
to
be
Table 4 8 Future Water Needs Evaluation Condition 2 Meet MDD with Firm Well Supplies Demands
Capacity
33
66
100
Dev
Dev
Dev
20 6
20 6
20 6
20 6
00 1
00 1
00 1
00 1
00 1
0
0
0
0
0
0
2005
2006
2007
2008
2009
2010
20 6
20 6
20 6
20 6
20 6
1 00
00 1
00 1
00 1
mgd Warren Wells
Valley
i t
Ames
Valley
Groundwater
0
SWP Water Total
Supplies
MDD
Deficit Surplusl rirrn weir
2
capacity
0
20 7
20 7
20 7
20 7
20 7
20 7
20 7
20 7
20 7
61 4
73 4
84 4
04 5
24 5
44 5
93 5
06 12
18 01
96 1
76 1
27 1
86 4
81 10
59 2 of the warren
SWP water is used
0
47 2 vaney
wens
36 2 exauaes
16 2 nitrate
ants p
zu a
mga
for groundwater recharge and does not contribute to maximum day production capacity
OIIC1USlo11 C
existing supplies are not sufficient to meet the future water demands so the District must develop additional production capacity before demands reach the 33 percent term supplies before development level In addition the district must develop new long It is concluded that the
yyH
Page
12 4
Section 4 Water Resources and
Supply
Assessment
development reaches the 40 percent level It should be noted that availability of SWP water for groundwater replenishment may change after 2023 when the MBP bonds are paid off After this Hh may need yeas WD
compete for available SWP supplies with other
to
MWA member
agencies fo address the future
deficit identified under both
supply
available to the District The potential future Future Water
Supply
many supply options discussed in the next section
conditions
supply sources are
Sources
Based upon supply demand evaluation the District will need at least S S00 amount to This could decrease about if the Ames supplies 700 acre 2 yr ft sustain the future
developed based Basin
allowed in the Settlement
pumping supply
water
on
in addition
the
Agreement
discussed include
sources
to
existing supply
potential
sources
without addiltial water
supply
These future
yr of new ft acre
Valley
replenishment
sources
supply
Basin
Plan These
potential
Negotiate long term agreement
can
The
that could be
sources are
identified
discussions with District staff and recommendations from the 1991 Warren
Management
are
Valley
sources are
with MWA for SWP
water
Obtain increased SWP allocation from MWA
Develop Water
a
water
exchange
Conjunctive Drill
new
use
supply
outside District boundaries
with MWD with MWA
wells in Warren
Construct surface
Valley and Ames Valley
water treatment
Purchase temporary
surface
Water conservation
measures
Recycled
Basins
facilities
water
supplies
water
Desalination
Negotiate Long term Agreement The
current contract
bonds 2023
far the
with MWA for SWP Water
Morongo
Basin
Pipeline
with MVVA is
set to
terminate when the
50 years 2041 whichever comes first The bonds are estimated to retire in After this time the availability of SWP water to HDWD and other MBP participants
are
retired
or
would be
s agency subject MWA wide policy on the sale of water as defined in Ordinance No 9 sSWP allocation is not fully utilized by its member agencies however growth Cuhrently MWA is expected to result in full utilization by 2028 MWA 2005 To ensure long term supply availability HDWD could negotiate an extension of the term of the SWP allocation at least for of MWA s SWP contract 2035 In the absence of such a commitment HDWD would need written assurance that MWA will obtain adequate imported water supplies to meet the the
term
future demands of IIDWD and other
MWH
agencies participating
in the MBP
Page
13 4
Section 4 Water Resources and
btain Increased SWP Allocation from MWA C MWA has
However the s MWA its
to
Table A amount
390 acre 6 yr ft
to
Others
for up to 75 800 acre yr of Table A water ft states that the basis for SWP supply allocation will be
seventh of If MWA agrees to allocate one the MBP participants HDWD could have its SWP allocation Table A amount
800 acre yr ft original 50
current
increase
specifically
MBP agreement
Assessment
water contract
SWP
existing
an
or
Supply
Using
the
estimates of SWP
recent
this increase could
reliability
623 acre 920 acre yr an increase of 1 ft provide the District with an average SWP supply of 4 the future allocation of SWP going discussions with MWA regarding yr The District has on ft water
The MWA 2005 Urban Water
Plan
Management
conservation of 10 percent the full available SWP 800 acre ftlyr 2030 MWA may have a deficit of 2 estimates between 2005 and 2028 indicate
a
Update supply
that assuming municipal by about 2028 By
indicates
will be needed
s Evaluation of MWA
cumulative
surplus
of supply
supply
over
and demand
demand of about
HDWD could
purchase some additional average supply in the from MWA when it is available for Warren SWP storage Valley Basin In addition HDWD is the only MBP contractor that is utilizing SWP water HDWD could utilize the unused conditions
160 000 acre ft assuming water
capacity
in the MBP
to
import
additional
water
when available
MWA 2005 MWA estimated that under feet per year will be needed by 000 acre 95
In its report Post 2020 Wate7r Supply Options different growth scenarios an additional 57 000 2050
MWA has initiated efforts
obtained
banking
MWA has
of conservation
has yet
growth
to
be examined
water can
to
large
needs
so
some
of this
Monterey Amendments Tabic A amounts from all of this
agencies
water
groundwater banking Metropahtan and feasibility of specific
Valley
term water supply relatively reliable long and replenish the groundwater basin The
and
area
1998
water can
agricultural
in the Central
Valley
provide
to
are
or
occur
in
excess
of their
for the transfer of
committed for
may still be interested
anticipated
the District s SWP contractor
The of the
130 acre 000 yr ft 2006 essentially transfer However some agricultural in transferring water if the price is
contractors to urban contractors
has been transferred
between
willing acquired 25 000 acre yr of Table A water ft Monterey Amendment Several SWP contractors
be transferred
the SWP contracts
to
to
MWA
their subunits have indicated that their Table A entitlements
water
The
underway
are
the SWP contracts allows transfers
Effective in
willing buyers
a
from Ben enda Mesa Water District under the or
term ashort
MWA 2005
provide
in the Yucca
Amendment
Monterey
recently negotiated
Water District of Southern California
Additional SWP Table A accommodate
new
Metropolitan term banking project larger long
a
2020 options 17ost
sellers and
supply might be appropriations water
options include pre banking existing supplies water transfers exchange arrangements developing water conservation or of existing supplies including exploring higher credits and aggressive management
discussions for
995 1
where this additional
sources
of
arrangement with the
to
determine
Potential ar
desalination levels
to
to
As of late
acceptable The District should work transfer
Such
be allocated
WH
to
availability of Table A water for transfers should be made with the understanding that the water would specifically the District or MBP participating agencies closely
with MWA
to
explore
the
Page
14 4
Section 4 Water Resources and
Ln addition
to
MWA
the District should
Supply
explore supply opportunities with
other
Assessment
regional
water
in the very early stages of Valley agencies example investigating the construction of a desert aqueduct to convey SWP water to the Coachella Valley Two principal alignments are under consideration a Pass Route roughly paralleling For
Water District is
the Coachella
roughly paralleling the MBP alignment This project may larovide significant partnering opportunities and could substantially improve supply reliability for It is recommended that the District staff discuss potential participation in the the District Interstate 10 and
a
Desert Route
VWD project C
Develola
a
Water
Supply
Outside District Boundaries
possibility of developing a water supply in the service area of another water district and exchanging SWP water for the new local supply This could be possible within water districts that have low quality water sources such as wastewater effluent or groundwater with high dissolved solids content that cannot be utilized without costly treatment Because to the many areas have access to less costly water supplies the value of imported water is higher District Thus the District maybe able to develop water supplies which are more expensive than the existing water supplies in another area but less expensive than the cost of imported water to e District The other water district would likely need to have a contract for SWP water which tl can be conveyed to the Yucca Valley area through the Morongo Basin Pipeline KJC 1991 There is also the
exchange might be financial participation in the development of a recycled water ar seawater desalination project near the coast The District could purchase a portion of the project capacity and through a water exchange would receive SWP water through MWA and the MBP This would require multiple interagency agreements between the project particilaants An
example
Water
of such
a
supply
and
Exchange
MWA is
expected
to
have
an
estimated
000 160
ftof unused SWP acre
supply
between 2405 and
supply would be to transfer a portian of it to another party as part of a storage agreement or exchange program In 2003 MWA and Metropolitan agreed on a Water Exchange Pilot Program with the goals of facilitating a water exchange in the short term and helping to determine the feasibility of a similar long teen exchange program between the two agencies Under the terms of the Pilot Program Metropolitan will deliver to Mojave up to feet acre of its SWP deliveries or other water In exchange in years when Metropolitan 000 75 s SWP requests water MWA will provide Metropolitan water through exchange of MWA In deliveries for that year less MWA s current demand of 5 2005 MWA 000 acre ftlyr amended the existing demonstl ation water exchange agreement with Metropolitan to extend the until storage period February 2006 anal allow Metropolitan to call back the water until December 2028 C ne
option
for
utilizing
this
2015 program in place with the 5olano County Water Agency WA This agreement allows MWA to receive entitlement deliveries from the SCWA during SC hydrologic periods when the SCWA has approved entitlement in excess of their needs MWA
MWA also has
will
MWH
an
subsequently
entitlement
exchange
allow the SCWA to utilize
some
of their
approved
entitlement
during periods
Page
15 4
Section 4 Water Resources and
of d ought but not delivered
than half of the
MWA It is
to
quantity
previously
some
to
Use and Groundwater
been
more
supply
Although these water exchange programs do not directly affect BDWD storage Warren Valley Basin could reduce pumping lifts and improve water quality
Conjunctive
Assessment
than its full years MWA could receive basin recharge alternatives designed to use SWP
that in
possible
of SCWA entitlement that has
these programs Therefore should consider the effects of a variable water
entitlement due water
more
Supply
of
water
in the
Storage
Agreement with MWA in 1994 that provided the en Valley opportunity to import additional water through the MBP for recharge into the Wal to the water stored in the basin Basin The District was able by MWA h7 directly purchase ft of conjunctive use water In 2004 the District 2001 the District paid for almost 1 500 acre 1VIWA and negotiated the Conjunctive Use Agreement to provide greater flexibility to bath re agencies Terms of the agreement include no agreement expiration no limit to the amount of water stared in the basin MWA is responsible for the cost of transporting the water to the recharge basins and the cost of water itself withdrawal from the banked water can begin only ft is reached and the District will provide water after t11e initial storage threshold of 2 500 acre from its SWP allocation if MWA requests a withdrawal Both agencies expect to store a total of ftof conjunctive use water in the basin between 2012 2006 HDWD 2006 900 acre 12 The District
Such
a
signed
conjunctive
use
Use
Conjunctive
a
project
could be
expanded to increase the amount of storage Again be pre delivery of MWA water when it is available
benefit of this program would later use during droughts or periods of reduced MWA SWP deliveries
primary
reliability
for HDWD but would not alter the
of
supply delivered water would be a credit against pre As discussed store cost
the
previously
water
for its
future
implement
use
not
The
average
for
This increases the
supply
because the
future deliveries
the District could also pre purchase SWP
own
of water for storage that may
District could
term long
the
water
principal shortcoming
be recovered
through
approach
is the initial
sales for many years The apply to new connections to
customer
that would
water
when it is available and
of this
purchase charge purchase and stare this water The supply would be limited by pre the available capacity of MBP and HDWD s ability to recharge the water However there is ently unused capacity in the MBP since other MBP contractors are not using this supply clal ate sufficient funds goner
a
to
The HDWD Board has
defines the amount of
allowed based
reserve
This
policy
on
04 that implemented Polley No 26 levels of prescribed groundwater storage
is described in
more
detail later in this section
curtailed if the minimum storage reserve the storage reserve exceeds five years
effective consider
IdDWD should establish
a
drops
basin
To
below ensure
growth
that is
Valley
Basin
policy requires growth to be three years there are no growth limits if that growth limitations do not become
This
that exceeds five years This reserve should during extended dry periods potential for water
reserve
anticipated reductions in SWP supplies quality degradation and uncertainty in local water supplies supply contingencies to determine a specific reserve volume
MWH
in the Warren
HDWD should evaluate
potential
Page
16 4
Section 4 Water I esourees and
Supply
Assessment
Drill New Wells If FIDWD continues wells
uct new const7
reement allows A demand
rely
on
future MDD
to meet
increased
day
demand of 6 8
mgd
Additional wells would also be out in this build
If
area
0 5
wells have similar
wells with
required
mgd
AmeslMeans
area
a
to
at
the
new
this demand
to meet
to
The
current
wells
existing
The estimated
400 acre 4 9 mgd yr 3 ft
Valley portion firm
area
with
of at least 5 8
new
with
a
wells
mgd
of the basin The MDD at
supply
in Warren
Valley
is
would be needed 65 rngd about 0 Valley and
wells in the Warren
Whether this number of
new
per well
nine
new
on
an
wells
wells could be located
this time
an
investigation
extraction that could be located within the Warren
identify
future demands
capacity
supply capacity
It is recommended that the District commission
potential
combined
in the Warren
of additional
capacities eight
within the basin is unknown
meet
is about
To meet all of the future demand in this
new
DWD would need I
average
Valley
to
area
2 is estimated to be 11 mgd
mgd Consequently
new
As
primary source of supply it will need to indicated previously the Ames Valley Settlement its
as
in that basin
pumping
the District will need to construct
2 6
groundwater
out in the Ames build Means
at
maximum
to
to
determine the maximum
Valley and Ames Valley basins
and
locations for future wells
Construct Treatment Facilities The District has MAP
access
to 7 83 cubic
Instead of recharging
l feet per second cfs or S mgd of SWP capacity in the the groundwater basin with SWP water the District could construct
plant to allow direct delivery of SWP water to its customers It is anticipated that such a facility would be used primarily during the summer months to meet peak water demands Under this option the District might treat and deliver 5 mgd of SWP water far 4 6 months This could provide 1 870 to 2 800 acre ftlyr of treated water Delivery of SWP water would still be required for groundwater replenishment during the winter months At the current a
water treatment
SWP
allocation 1 482 to 2 412 acre ftlyr
recharge This
option
would
of SWP
water
would remain available for
groundwater
under full SWP deliveries
could increase the
increase the District s available
not
meeting MDD conditions However it supplies In fact it would divert water from
peak supply capacity water
for
to direct
uldwater recharge gro condition In addition vulnerable
delivery and may leave the groundwater basin in a deficit reliance on surface water treatment would make the District more
supply shortages during droughts when SWP deliveries are reduced Since a water treatment plant may not be operated continuously the unit cost of treatment is expected to be higher than if operated continuously Consequently this option does not appear to be viable at this point in the absence of additional water supplies to
Temporary Some water
MWH
areas
Water
Supplies
in California have
agencies Generally
water
these
supplies that are temporarily available for purchase by other supplies are surface water that would otherwise be lost if
water
Page
17 4
Section 4 Water Resources and
not
used To utilize these
yinfrastructure deliver
or
temporary
be in
a
water
position
to
supplies do
the
a water
Supply
purchasing agency
Assessment
must have
sufficient
exchange
Pez interruptible water is available from the SWP The cost of this water is typically iodically effective water source provided it can be the cost of pumping on the SWP making it acost utilized HDWD could establish an agreement with MWA to purchase interruptible water and convey the water to the District
through
the MBP
Water Conservation Measures
Water conservation is
demand
through
important
an
efficient
use
element of
will continue
water
supply management
be essential
Reduction in
water
the District grows Currently water to other desert areas because of minimal
to
as
usage in the District is relatively low compared irrigation It is expected that this trend will continue in the future
As part of its 2004 Regional Water Management Plan MWA has planned on a 10 percent water conservation level Given the District s current low water usage it is unclear whether an additional 10 percent reduction is
However 25 acre 1 yr ft
out by about this level of conservation could reduce future demands at build
he I istrict has
active
feasible
prohibitions
an
and
conservation program that includes public education water use of water conserving fixtures The District has an active public education
use
water
program that provides information on a greywater native plant landscaping leak The District has
adopted
water waste
variety of topics including water conservation detection cross connections and septic tanks to
prohibitions
reduce
water
use
of
wastage HDWD 2006b
These include
Washing
of sidewalks
driveways with a hose is prohibited clean fill operate or maintain levels in decorative fountains
walkways
Water shaIl not be used to
and
unless such water is part of a recycling system Potable
water
application
to
from
within the District shall
not
be used
the District
commercial washing of privately owned vehicles is Non hose No
equipped of
use
participate with the informed
charge In 1
with
water
adjacent lands Customers
permitted only
from
flooding
or
off onto run
hardscape driveways
on
reading
their
water meters
and
checking Program By making representative at their home
in the District s Household Water Awareness customers
can
meet with
a
on
the District
bucket and
a
automatic shut offnozzle
assistance
wanting
District
a
streets
into gutters shall be permitted
or
adopted
flow toilets and other
MWH
an
that results in
ways to conserve water save money for this service HDWD 2006b
X90
maintain dirt roads without
to
a
resolution that
water devices saving
on
their
requires
such
as
water
that all
bill
new
and much
for leaks may an
appointment
Customers
more
There is
are no
homes be installed with low
flow showerheads and flow restrictors low
on
18 Page 4
Section 4 Water Resources and
sulks
Additionally
the
The District has also
Assessment
upon the transfer of ownership of property and tenant requests water service HDWD 2006b
same
property whenever a new
Supply
applies
adopted
water
hours
to
reduce
water
wastage during the hot
on
rental
summer
During the high use season beginning June 1 and ending September 30 of each year 00 00 a m and after the hours of 5 irrigating and watering is permitted before the hours of 9 low season beginning October l and m or no more than three days per week During the use p at is the discretion of the customer taking into ending May 31 of each year watering permitted account weather conditions such as wind and temperature However watering is only permitted three days of the week HDWD 2006b months
12ecycled
Water
currently generate recycled watei as the However to reduce the nitrate contamination
Ize District does Z
not
entire District is
on
individual
groundwater basin the to install sewers and construct a wastewater treatment facility onstruction of a wastewater treatment facility will likely be a condition for future development C due to Regional Board policies Upon project completion recycled water will be available for uses such as groundwater recharge landscape irrigation etc HDWD 2006a If the District line is 2009 The rn with the design of the project this year the earliest it would be on c nenced District has estimated that about 1 000 to 1 600 acre ftlyr could be recovered through recycling water It is atlticipated that any recycled generated would offset a portion of the existing percolation of septic effluent occurring in the basin Consequently no additional water supply would be generated by recycled water However the reduction in nitrate loading to the basin would be a major benefit septic systems District has preliminary plans
in the
Growth Limitations Court overseeing the Warren
judgment approved a The court proposal to revise the method for allocating water meters approved method establishes a direct relationship between groundwater reserves and actual growth Groundwater reserves are based on the amount of water recharged in the Warren Valley Basin This method water reserves in the groundwater basin reach apre removes all restrictions on unless growth 04 deten7ainedlevel In response to this court approved proposal HDWD adopted Polley Na 26 titled Issuing Will Serve Commitment Letters and the Installation of New Water Services and Rescinding Policy 23 03 A copy of this policy in included in Appendix F This policy provides for a staged method for approving growth In December
2003
the
Superior
Valley
Basin
growth limitation would be implemented in the event water reserves in the Warren Valley Basin are equal to or fall below 5 years 500 percent of water demand for that particular year A 1 percent growth limitation would be implemented in the event Stage 2 Condition water reserves in the Warren Valley Basin are equal to or fall below 4 years 400 percent of water demand for that particular year Stage 3 Condition A 0 percent growth rate would be implemented in the event water reserves in the Warren Valley Basin are equal to or fall below 3 years 300 percent of water demand for that particular year Stage
MWH
1 Condition
A 2
percent
19 Page 4
Section 4 Water Resources and
The effect of this ent ctu
and
dry period
policy
to
maintain minimum
groundwater
reserves
that
are
to meet
adequate
years without causing overdraft Should an extended that draws down the reserves below the established levels limitations on demands
approved occur
is
Assessment
Supply
during dry
To growth would be implemented I changes to this policy are anticipated earlier this policy would limit growth if adequate water supply reserves are not
of additional
approval
As discussed maintained
Desalinated Water Yucca
it
is
is
Valley
not
100 miles away from the nearest ocean water supply Therefore that desalinated water will become a viable source in the near future
approximately
anticipated
Because of the
distance constructing
a
transmission
pipeline
would
be feasible due
not
to
the
Since MWA manages the through potential MBP that provides SWP water to the Yucca Valley there may be opportunity to increase SWP supplies by developing desalination facilities with other coastal SWP contractors thus creating alternative could exist
A
extreme cost
exchange opportunities
Summary
of Supply
currently evaluating
to
acquire up
to
500 acre 5 ftlyr
The District should be able
demands
this concept
HDWD 2006a
Options
The District will need out
MWA is
the MWA
to
of additional water
obtain additional
water
supplies
to meet
build
from the Ames Means
in that area but the long term yield of the basin is uncertain at Valley growth this time if this basin becomes overdrafted a replenishment program may become necessary The amount of replenishment water would need to be evaluated but for planning purposes it is Basin
as
expected that an supply needs
occurs
800 average of 2
Since the Warren increased
water
Valley
yr may ft acre
Basin is
fully
from the SWP is the most
be required
utilized and
likely
This
dependent
source
for
new
water
on
is included in the total
imported
water
water
If HDWD
can
recharge negotiate
extension of the MBP agreement and obtain a commitment for additional water from MWA it 600 acre ftlyr of additional supply A portion of the supply needs maybe able to obtain at least 1 Buz
could be
ftlyr
generated through
increased water conservation with the
ol demand reduction Absent of the need for may
If the District
demands
replenishment
Additional
provide adequate supply purchases pre purchase of SWP supplies
measures
cannot
Yucca
maintain
Valley
an
will need
to
water
water
limit its future
for about 2 1 50 acre two these Valley
in the Ames
could be obtained
from MWA and
adequate
potential
supply
through through conjunctive use
SWP Table
when needed to meet the
growth pursuant to Policy No
growing
04 26
UATION OF WATER QUALITY A EXISTtNG AND FUTURE REGULATIONS AND E his section discusses federal and I the
existing supplies
MWH
state
and evaluates the
quality regulations evaluates the water quality water system s adherence to waterworks standards water
Page
of
20 4
Section 4 Water Resources and
Water
Supply Assessment
Quality Regulations
T11is subsection discusses that the District
existing
water
quality laws existing regulations
and future
regulations
must meet
Laws
hc Federal Safe 1
Drinking
Water Act
Public Law
SDWA
339 originally 99
enacted in 1974
gave the federal government through the United States Environmental Protection Agency FPA the authority to set standards for drinking water quality in water delivered by public watcr
suppliers
In 1986 and
The California Safe
through
5The 4037
California
drinking
Drinking primacy
hPA
has
least
at
established
to
the SDWA
Safety Code Sections 4010 Department of Health Services DHS alifarnia Code of Regulations Title 22 C
agency for California is the
as
new
contained in
are
Sections 64400
through 17 water regulations must be
amendments
Water Act is contained in Health and
regulations
water
haptcrs 15 C
The
1996 Congress passed major
primacy state California drinking can be more stringent than federal regulations
64690
through
stringent but
As
contaminant
maximum
a
levels
and
MCLs
monitoring
egz for many additional contaminants pursuant to the Federal Safe Drinking Water Act i iircments Amendments of 1986 and 1996 As the primacy agency in Califonlia the DIIS has adapted more stringent standards for a number of inorganic compounds IOCs volatile organic compounds VOCs
and
Cs synthetic organic compounds S
Existing Regulations The MCLs for
inorganic
summarized in Table 4 9
chemicals
secondary levels The primary MCLs secondary MCLs are aesthetic standards The
most
important regulations
luoridation In h or more
1993
forth
set
by
As shown in this must
for the District
California
passed
service connections that does
a
not
table
be
are
law have
the EPA and the state
met
MCLs to
are
deem
separated
water as
of California into
safe
are
primary
and
drink
The
to
discussed below
requiring a
any
public
water
fluoridation system
to
system with 10 000
install
a
fluoridation
system if DIES identifies a source of sufficient funds to cover capital and associated casts necessary to install such a system Lnstallation should be completed within two years of the date that funds are received by the water system The optimal fluoride level should be 0 7 mg 1 6 L but 2 0
mglL is the MGL
The District very
scaon
currently has 9 352 active connections so it will need to install a fluoridation system Only Well lOW has naturally occurring high fluoride concentrations and does not
need additional fluoridation
Stage
1
Disinfection Disinfectants
DisinfectantfDisinfeetion
Product By
Rule
The EPA
published
the
Stage
1
Product D By DBP Rule in December 1998 This rule established 080 mg TTHM at 0 L halaacetic acids HAAs or HAAS at
MCLs for total trihalomethanes
MWH
21 Page 4
Section 4 Water Resources and
Supply
Assessment
mg established Maximum Residual L 8 4 mg 4 mg Disinfectant Levels for chlorine L and chlorine dioxide at 0 L chloramines the mgll within the distribution system and established enhanced coagulation requirements for As of water conventional treatment reduction of DBP precursors for surface systems using ebruary 2006 DHS has not yet adopted the Stage 1 DBP Regulation but issued draft 1 regulations in March 2005 However compliance with the federal regulation is still required ompliance requires monitoring for TTHMs and HAASs from a minimum of one sample per C quarter per treatment plant collected at a location representing the maximum residence time 060 0
L mg
bromate at 0 010
L mg
O and chlorite at 1
at
uFithin the distribution system
at
DNS 2003
already initiated quarterly TH1VI monitoring in May 1994 and completed it in May approval from DHS in September 1995 the District reduced the monitoring to The District two samples per year far THM potential beginning with sampling in May 199 with the total TIdM MCL of 100 g1L in all sampling rounds However the District complied will need to do quarterly monitoring again because of the new rule HDWD 2005e The District had
995 After 1
Interim Enhanced Surface Water Treatment Ruie In December the final Interim Enhanced Surface Water Treatment Rule IESWTR
systems utilizing surface
serving
more
requirements for surface
than
water or
000 people 10
this rule established
water
groundwater
the EPA
1998
The IESWTR
under the direct influence of surface
published applies to water
and
compliance starting in January 2002 Among other a requirement to achieve a log reduction in Cryptosporidium 2 with
systems that filter
It also lowered the
standards from 0 5
existing turbidity
nephelometric turbidity units NTU in 95 percent of the monthly measurements not to exceed 5 0 NTU in 95 percent of the monthly measurements not to exceed 1 NTU DHS NTLT to 3 prepared
draft
regulations to implement
The District is affected
people
MWH
by
this
the IESWTR in March 2003 that
requirement
because it receives SWP
are
in review
water
and served
300 21
in 2005
Page
22 4
Section 4 Water F esources and
Supply Assessment
Table 4 9 Maximum Contaminant Levels for
Inorganic
EPA
EPA
Chemicals
State
State
Primary
MCLt2
Secondary txl MCL
1
2 0
Chemical
Units
Aluminum
L mg
CCL
Antimony
mglL
006 0
006 0
L mg
01 0
05 0
Primary
hi MC
Arsenic
as
Secondary l t MCt 05 to 0 0 2
of 1123 06
Barium
L mg
2
1
Beryllium
004 0
mgiL
004 0
Boron
L mg
CGL
Cadmium
mglL
005 0
Chlaride
250
mg1L
Chromium
Total Cr
Chromium
Total
Cr VI
L mg Screen
005 0
1 0
600 500 25p 05 0
L mg
Gopper
L mg
3 1
1
3 1
Fluoride
mglL
4
2
2
Iron
L mg
Lead
L mg
Manganese
L mg
Mercury
L mg
Niekel
L mg
Nitrate as NOs
L mg
Perchlorate
3 0 015 0
1
3 0 015 0
05 0 002 0
05 0 002 0 1 0 45
L pg
CCL
Selenium
mglL
05 0
Silver
L mg
Sulfate
L mg
6
NL
05 0 1 0
1 0 250
600 500 250
Thallium
L mg
002 0
002 0
Vanadium
L mg
CCL
inc
L mg
5
5
Ccalar Apparent
units
15
15
Odor Threshold
TON
3
3 5 0
MBAS
L mg
5 0
pN
units
8 5 6
Speaific
Conductance
2200 1600 900
cm pS
Total Dissolved Solids
L mg
Turbidity
NTU
500
1500 1000 500 5
1 EPA 2003 2 DNS 2004 3 Values shown
term limits for the indicated constituent Water less than the upper limit are the recommended upper and short term limit may only be acceptable if it is not reasonable or feasible to provide more suitable water Water up to the short served on a temporary basis pending treatment or development of acceptable new supplies Lead and copper action levels are exceeded if more than 10 percent of the samples exceed the values indicated is
4 5
GGL indicates the contaminant is
MWH
on
the Contaminant Candidate List
Page
23 4
Section 4 Water Resources and
Nitrate and Nitrite
Nitrates
organic
combitle with various
converted into nitrites
and
and nitrites
NOz inorganic compounds
3 NC
Infants less than six months old
Supply
Assessment
nitrogen compounds that oxygen Once taken into the body nitrates are who drink water containing nitrate in are
seriously ill and if untreated may die Health affects include of breath and blue baby syndrome Both the EPA and DHS established the MCL far 10 mglL 5 mg N at 1 mg L as N03 and for NOz L
of the MCL could become
excess
shortness
ls at NOS Several
groundwater
wells in the District
are
affected
of nitrates in the District is
by high nitrate
tank effluent
concentratians The
Monitoring
primary required
for nitrate is
septic halfthe nitrate annually increasing to quarterly for sources which exceed one Monitoring for nitrite is required every three years increasing to quarterly far ce sour
MCL of 45 those
L mg that
sources
exceed one halfthe nitrite MCL
Arsenic Arsenic is surface
water
naturally occurring inorganic
a
and is considered
supplies
MCL from 0 005 mgfL
to 0 01
L mg
in
a
contaminant found in
known human
January
carcinogen
some
groundwater and
The EPA lowered the
2001 The effective date for the arsenic rule
was
compliance date for the regulation was January 23 2006 All surface systems complete initial monitoring by December 31 2006 while groundwater must complete initial systems monitoring by December 3l 2007 2002 and the
February 22 water
must
This may be a concern for the District since some wells have experienced concentrations as 17 2000 HDWD 2005a HDWD 2005b b between 2004 pp
Stage
Z DBP Rule
includes the
1
The EPA
published following requirements
he EPA finalized the 1
ently cancun
with the
Long
Stage
the
Stage
2 DBP Rule
on
January 4
2006
as
high
The rule
Term 2 Enhanced Surface Water Treatment Rule LT2ESWTR
2 DBPR
to ensure
simultaneous
protection
from microbial and
DI3P risks 2
IDSE must be conducted for systems serving 000 people 10 study to identify and select future monitoring sites representing high TTHM and HAAS levels in the distribution system If all samples far 040 mg 030 mg Stage 1 DBP Rule monitoring are less than 0 L for THM and 0 L for HAAS no further 000 and 50 000 monitoring is required Agencies with populations between 10 need to submit an IDSE plan by October 1 2007 IDSE reports must be submitted to DHS An Initial Distribution more
3
4
Evaluation
Atl IDSE is
Systems serving an
System
than
a
between 10 000 and
the IDSE and the
50 people will need to complete and submit reports 000 Cryptosporidium monitoring to DHS by December 31 2009
The IDSE includes recommendations far
new
DBP
compliance
locations and the months in
monitoring Compliance with the Stage 2 DBP Rule DBPR will be determined using a Locational Rurn ing Annual Average LRAA instead of a distribution wide running annual average Groundwater systems serving more than system 000 people will monitor quarterly at the highest THM location and the highest HAAS 10 which TTHM and HAAS
should
location The bromate MCL will remain of a
year review six
should be
MWN
to
at
occur
OlO O
L mg
The MCL will be reviewed
determine whether the MCL should stay
at
010 mg 0 L
or
as
part
whether it
lowered
Page
24 4
Section 4 Water Resources and
5
Supply
Assessment
within three years of the final rule being published systems will have to comply with Stage 10 mglL far HAAS using the LRAA approach but 2A MGLs of 0 120 mglL for THMs and 0 e not the new locations as will be using the Stage 1 DBP Rule sample locations i
compliance with the Stage 1 Ms and 0 060 mg Ls of 0 MC 080 mglL for TI L for HAAS with compliance based on the distribution system annual year extensions far capital projects wide running average Two will be available Within six years of the final rule systems will need to be in campliance 080 mg1L for THMs and 0 060 mg with the Stage 2B 1VICLs of 0 L for HAAS using the new sample locations identified per the IDSE and using the LRAA for compliance determination Two year extensions for capital projects will be available determined
by
the
IDSE
as
well
as
continue
demonstrate
to
monitoring no conclusions can be made regarding the IDSE at this time The Stage 2 DBP Rule will require the District to The monitor DBPs in its distribution system at locations having high DBP concentrations change to a LRAA may result in compliance issues however the extent is unknown at this time Because MWH
Future
was
provided with
not
the results of Stage 1 DBP
Regulations
regulations are under development at the federal and state levels that could affect water utilities using groundwater to augment their supplies Six pending regulations that could affect the District s local groundwater supplies are arsenic chromium 6 radon sulfate the grotiuidwater treatment rule and the Stage 2 DBP Rule Several
ia Health Although a new federal MCL for arsenic has been established the Califos to a new arsenic MCL Code Section 1 1 6361 DHS required by June 30 2004 Safety adopt
Arsenic and
HS I
was
unable to
Health Goal
meet
the June 2004
for arsenic
In
requirement April 2004 the
because
at
that time there
was z1o
Public
Office of Environmental Health Hazard
PHG 004 g L based on risks associated with QEHHA established the arsenic PHG at 0 cancers of the lung and bladder DHS is now proceeding with the MCL process for arsenic and as of March 2006 anticipates proposing a new MCL for arsenic by the end of 2006 This new Assessment
MCL could be the for
blending
same or
lower than the federal MCL A lower MCL could result in the need
or treatment
Chromium 6 Hexavalent chromium
chromium 6
when
the evidence for its
however
carcinogenicity drinking water by a total
chromium 6 in
regulates
both chromium 6 and
a
is known
to cause cancer
ingested
is
not
when it is
compelling
inhaled
California
chromium MCL Total chromium consists of
metal trivalent chromium chromium 3 The 1 L the federal MCL for total chromium is 0 mg total chromium of 0 0025 mg L in February 1999 In
toxic form of the less
alifol MCL for total chromium is 0 C nia 05
The OEHHA adopted a PHCs for November 2001 OEHHA withdrew its PHG for total chromium in drinking water C9EHHA is developing a new chromium 6 PIIG that will replace the withdrawn PHG for total chromium
L mg
DHS will state
The the
law
new
use
the
As of March
to
2006
there is
develop
to
no
a
drinking water standard as required by adopting the new PHG or the MCL
chromium 6
schedule for
have little effect
the District s
regulations
are
expected
has
not
exceeded 0 016 mg L total chromium
groundwater
WH y
PHG
new
on
water
system operations as IIDWD 2005b 2005a HDWD
25 Page 4
Section 4 Water Resources and
Ftadlonuelides
DHS issued
a
notice of
proposed rulemaking
to
Supply
Assessment
adopt updated drinking
water
far radionuclides
radium radium 226 228 gross alpha particle activity uranium and 90 tritium This proposed regulation would incorporate all betaJphotan emitters strontium of the federal regulations except for uranium which will be kept at the more stringent state MCL regulations
of 20 dune 1 The
per liter pCi L The comment period on the proposed regulations closed 2005 These regulations could be approved in the first half of2006
picocuries
s water system operations as regulations are expected to have little effect on the District not and some of the change monitoring requirements may be reduced
on
the
numerical limits will
Radon
Radon is
decay product in certain rack formations Under the 1996 amendments to the SDWA the EPA published far public comment a health risk reduction and cost analysis for a potential radon standard on February S 1999 The EPA was required to propose a radon regulation in August 1999 and to publish a final regulation in August 2000 On November 2 1999 the EPA published for public comment a proposed L of 300 pCilL far groundwater systems serving 10 MC 000 or more people However the 1996 A amendments require the EPA to establish an alternate 1V1CL AMCL far radon if the SDt a
naturally occurring
contribution of radon from air phis AMCL is
proposed
A Final Radon Rule
2001 and had into ofEce
water to
was
to
be
sent to
gas that is
a
radioactive
radon in indoor air is less than
w nc
the Office of
Management and Budget OMB on January 19 review by the time the new Bush Administration came
gone through the OMB The Radon Rule has been sent back not
rule will have little effect
Groundwater Rule The EPA is
levels in outdoor
000 pCi 4 L
to
the EPA for review
completed it will go back to the OMB far their review radon MCL is uncertain as of March 2006 The
background
on
the District s
developing pathogens
from bacterial and viral
a
water
After that review is
The schedule for
system
groundwater
promulgation
of
operations
rule
GWR
to assure
fecal contamination indicators in
public health groundwater
protection The proposed GWR will specify appropriate use of disinfection and encourage the use altenlative approaches including management practices and control of contamination at or
a
of its
source
May 10 2000 EPA published the proposed GWR The public comment period closed on August 9 2000 In January 2005 EPA sent the final GVVR to the OMB fora 90 day review In March 2005 EPA voluntarily withdrew the rule based on issues raised by the OMB and anticipates promulgating the final GWR in August 2006 n C
The District
1 S samples per week from the distribution system All wells in routinely collects 12 operation sampled monthly far bacteriological quality The bacteriological monitoring program collects representative samples throughout the distribution system and complies with currant regulations are
MWH
26 Page 4
Section 4 Water Resources and
Total Goliform Rule
The EPA
The Z CR
public
all
requires
published
water
the Total Coliform Rule
systems
monitor
to
distribution systems as measured by total coliforms Drinking Water Act require the EPA to review and revise
strategies
assess
public health protection developed a series of white
as
appropriate h1 July 2003
data information
Tune
29 199
to
as
its decision
the Safe
phimary
part of its National to
revise the TCR current
additional alternative
maintaining
system experts
in their
each national
the effectiveness of the
supportable
The EPA and distribution
on
the presence of coliforms
available that would decrease economic burden while
are
TCR
The 1996 amendments
drinking water regulation not less often than every six years Primary Drinking Water Regulation Review the EPA published As part of the TCR rulemaking the EPA plans to reducing public health risk and what technically
Supply Assessment
or
TCR in
monitoring improving
external to EPA have
The
papers objective of the white papers is to review the available and research regarding the potential public health risks assaciated with the
distribution system issues and where relevant identify areas in which additional research may be warranted In addition the EPA and AWWA are preparing a series of ten TCR issue papers
presenting
available information related to
the papers
as
sources
for
for discussions
potential on
TCR revision
The EPA will
TCR issues with the
drinking
use
water
experts and stakeholders
unity coznn Water
information
topics
Quality
11is subsection describes the T
quality monitoring requirements
water
s wells It also discusses the District
specific
and
compliance
of the
exceedances of the California MCLs
Monitoring bacteria minerals inorganics volatile products The following organics synthetic organics unregulated chemicals and disinfection by Annual information is summarized from the DHS 2003 monitoring Inspection Report and The District
regularly
IIDWD Well Water
monitors its
water
Quality Data from
quality
far
2005 1992
According to DHS vulnerability assessment letter dated December 26 2001 the District is required to monitor all active wells for general mineral general physical and inorganic chemicals every three years The District is up date on all chemical monitoring to
Monitoring
for
radiological
Since Wells 6W
and 14E
9W
required for four consecutive quarters every four years relatively new they have not yet been monitored for four
chemicals is are
consecutive quarters
vulnerability assessment letter regulated VOCs are required to be monitored every The District is up date on all VOC monitoring except for Wells 3W 9W and 12E to
Per DHS years
Per the DHS MTBE
vulnerability
have each been classified
as
assessment
either vulnerable
letter dated or
August 23 2001
vulnerable non
to MTBE
six
the District s wells To
complete
the
monitoring requirements for MTBE all wells must be sampled for four consecutive quarters and then annually for two years Following completion of the initial MTBE monitoring initial
requirements MTBE monitoring waiver to
MWH
The District may apply for a will be monitored every three years reduce the monitoring frequency to once every six years for those wells
Page
27 4
Section 4 Water Resources and
designated 2W 12E
as
vulnerable non
to
The District needs
MTBE
to
Supply Assessment
complete monitoring
far Wells
and 17E
year Monitoring of representative water sources for SOCs is due every three years A three is detect non Waivers will not be given waiver be for if SOC may sampling monitoring applied EDB All Wells l0E and 24E have not been for DBC and simazine monitoring wells except P monitored far any SOCs
Monitoring
for
chemicals is
unregulated
required
from each well for
two
sampling rounds
five
months apart At least one sample must be collected during the vulnerable time period betweetl May 1 and September 30 Monitoring for two rounds for all wells except Wells 7E and to seven
IOW leas been
completed
The District collects four
water
for
color odor
sampling comply
The results of this
system system
samples
and
turbidity per week from the secondary standards
with
the distribution for distribution
quality month lead and copper monitoring two rounds of completed two rounds of six two rounds of reduced triennial monitoring The 90 percentile monitoring and
The District has reduced annual
lead and capper levels were below their respective action levels in all sampling rounds according The District was due again far lead and copper to the 2003 Annual Inspection Report
monitoring
in
summer
2005
but this has
not
been completed
as
of February 2006
Maximum Contaminant Level Exceedances
The
primary
water
quality
contaminants of concern
are
concern
for the
s District
arsenic fluoride iron
and
groundwater turbidity
wells is nitrate
Other
water source is most vulnerable to nitrate contamination from septic systems in the Nitrate exceedances occurred in Wells 12E and 17E between 2000 2003 while fluoride
The District s area
exceedances occurred in Well lOW between 2003 2004 The
specific
exceedances
listed in
are
Table 4 10 and Table 4 11
C o nsequently in excess
to
2002
the District installed
nitrates from Wells 12E and 17E
eliminate the need for
2005b nitrate is
June
septic
an
ion
exchange
A wastewater treatment
tanks in the
more
treatment
facility
be built
plant will eventually
densely populated areas
of the District
HDWD
IS 2003 Wells 12E and 17E DI is blended with Well 16E water which is law in and discharged to the distribution system via pipelines to the three well sites The plant water
consistently below 20 mglL nitrate and not exceeding and blended water below 30 mg L nitrate DHS 2003 The use of Well 5W ontinued because it contains high nitrates that cannot be cost dist effectively treated capable
of
producing
exchange plant
MWH
to remove
water
Well lOW
water
is blended with well
to
lower its
high
36
L mg
has been at
the ion
fluoride concentration
Page
28 4
Section 4 Water Resources and
Supply Assessment
10 Table 4 Nitrate MCA
45 mg Specific Exceedances
Well ID
12E
Sam
le Date
03102 07
51
02 24 04
50
02 23 01
53
01 10129
53
00 17 07
L
52 5 50
03 16 07
45
03 12 02
50
01 22 03
53
02 20 06
54
02 23 01
56
01 10 07
52
01 02 07
52
16101 01
MWH
m
45
01 05 02
17E
Nitrate
03 15 01
2005 1992
54
12 1100
0 58
00 17 07
4 58
99 12 07
7 66
98 20 07
6 66
01 19 98
0 45
Page
29 4
Section 4 Water Resources and
Supply
Assessment
Table 4 11 Fluoride MCL
2005 2 mg Specific Exceedances 1992
Well ID
Sam
10W
Table 4 12
2004
as
Fluoride
m
0 2
03 19 02
3 2
03 02
2
99 14 04
69 2
summary of the contaminants that exceeded the MCL between 1992 and in Consumer Confidence Reports from 199 2004 and Water Quality Reports
presents
reported
le Date
01 14 04
a
from 1992 1997
12 Table 4 Contaminants
the MCL Between 1992 2004
Exceeding
Contaminant
Year
Arsenic
2004
District Ran
2003
050 0 050 0
050 0
012 0 05
050 0
1993
012 0 05
050 0
2000
244 0 9 2 9
1999
254 0 6 2 8
1997
17 0 7 2 9
2 2 2 4 1
790 0
3 0 3 0
167 3 0 00
1996
71 1 0
3 0
2003
51 5 8
45
2000
65 5 2 1
45
1999
82 0 5 2
45
1998
81 0 2 3
45
1997
95 6 4 2
45
1996
7 5 1 0
5 NTU
1992
6 1 0
5 NTU 0
2000
9 4 7
Radon 222
1992
1003 525
1000
Total Dissolved Solids
2002
750 120
500
Uranium
1996
24 3
20
Vanadium
2004
58 0
50
H
L was lowered from 5U ppb to 1U ppb 1 Arsenic MC
Results are taken 2
at the well
prior to
treatment
on
8 5 6
January i uuEi
This
high
nitrate water
was
he most recent measured nitrate and fluoride concentrations
ortunately
MWH
m
1994
2000
Turbidity
MCL
050 0
017 0
2002
Nitrate
L
017 0 ND
1997
Iron
m
0 0 0 112 02
2000
Fluoride
e
013 0
none
ofthem exceeds their
respective
not directly served to customers
are
presented
in Table 4 13
MCLs
Page
30 4
Section 4 Water Resources and
Supply
Assessment
13 Table 4 Current Nitrate and Fluoride Concentrations Well ID
Sam
le Date
Nitrate
L
m
Fluoride
m
2W
05 19 01
18
ND
5E
10 05 26
40
ND
05 10 08
20
ND
8W
10 05
11
ND
9W
05 13 04
14
10W
10 05
2 8
ND
11 W
04 07
11
ND
12E
05 29 06
30
ND
14E
05 13 07
16
ND
16E
05 29 06
21
ND
17E
05 15 06
37
ND
18E
10 05
11
24E
10 05
8 5
6W
L
33 0
ND 69 0
Note ND non detectable
Waterworks Standards Based
the latest DHS Annual
on
complies
with the
Inspection Report from 2003 standards established by the California
current
the
existing
water
system
Waterworks Standard and
American Water Works Association
The District s
source
improvements comply
distribution
capacity storage capacity
facility construction
with the California Waterworks Standard
The
water
and system
main disinfection
complies with AWWA standards Per DHS requirements the water is chlorinated after pumped from the wells HDWD 20OSb The design of the ion exchange treatment plant and the installed reliability features have adequate redundancies to prevent water exceeding the nitrate MCL from being delivered to the public program
it is
All wells have surface and
sanitary seals except
for Wells 2W and
sanitary seals Currently Well 3W is inactive Well 2W probably be removed from service with little impact if its
3W which do not have is aloes producing well that could water cannot meet drinking water
standards
FINDINGS AND RECOMMENDATIONS The District s current
water
supplies are adequate to of development provided
about the 50 percent level Basin as allowed in the Settlement
Agreement
At
meet current and
projected
demands until
pump water from the Ames Valley out the District will require at least build it
can
yr under ft 600 acre acre of additional supplies and could require as much as 5 yr ft s well production capacity is adequate to meet MDD average hydrology conditions The District until about the 33 percent development level 90C 2
To meet build out conditions it will need to which 4
MWH
mgd
should be in the Ames
develop nearly 13 mgd of new well capacity of Valley Basin with the remainder in the Warren Valley
31 Page 4
Section 4 Water Resources and
Basin
It is
maximum
recommended that the District commission
potential
s and to il Bas
locations for future wells
The District should continue discussions with MWA
supplies including
the
acquisition
available for storage in the Warren
to
obtain
along caznmitment term
of additional SWP Table A water
work with MWA to obtain additional SWP water
MWH
investigation to determine the Warren Valley and Ames Valley
an
extraction that could be located within the
identify
Supply Assessment
Valley Basin
either
for future
Table A
or
for SWP
The District also should
interruptible water
when
use
32 Page 4
Section 4 Water Resources and
Supply
Assessment
REFERENCES
alifoz Department of health Services C lia ater District Yl
2003 Annual Inspccti Desert nReport fo Hi
DHS
2004
May 2003
alifonlia Department of Health Services C related Laws and
Califortzia
DHS
Regulations
Department
Title
22
Division
California Safe Drinking
4 Chapter
of Water Resources
I1 3 Individual Basin
DWR 2004 s alifornia Groundwater C Descriptions February 27 2004
FDA 2003 National Primary
Drinking
Water
2005 Annual Reportt of the Warren
f7ctubcr 1 2004
through September
Desert Water District Hi
HDWD
Available
2005b
Accessed
HDWD
2005c
HDWD
2005d
www Accessed htm supple eom hdwd Ii Water District I Desert
HDWD
2005e
Watermasterfor the Period
2005
Quality Reports
January 3
Available
2006
Monthly
Accessed
Board
Report
Water stats com hdwd www http pdf Culyr
Desert Water District 1Ii
2006 E mail
1999 2005 Consumer Confidence
htm waterquality com hdwd www http
esert Water District I Hi Available
HDWD
21
199 Water 1993
lwww hula water com hdwd quality htm Desert Water District Hi
Valley Basin
30 5 2Q December
2005a
Bulletin
June 2003
Standards
CJrady Pat Hi Desert Water District Information Systems Manager correspondence January 19 2006 lanso James C I n
Water Act and
I5 June 2004
Recharge
Reports January 3 2006
for Fiscal Year 2004 05
Accessed
January 24
2006
Water Available
December
22
2005
Watermaster Available
htm Accessed December 20 2005 watermaster com hdwd www Desert Water District Hi
HDWD
2005f Well Water
Desert Water District Hi
HDWD
2006a 2005 Urban Water Management Plan
Desert Water District Hi
HDWD
2006b Water conservation programs and ordinances
Quality Data from
2005 1992
www httpJhttp htzn gencon com hdwd htm handouts com hdwd www htmAccessed ordinanees com hdwd www http John
Egan
and
Associates
March 20 2006
2001 Hi Desert Water Distr ict Water Master Plan
Update
Lecember 2001
MWH
Page
33 4
Section 4 Water Resources and
199 L
a KJC Chilto KennedylJenks rt January 30 Rc
Mojave
Warren
Supply
Halley Basin Management Plan
Assessment
Fznal Draft
1991
Desert Water District I tDWD 1991 Agreement MWA and the Ni Construction Operation and Financing of the 1Vlorongo Basin Pipeline Project
Water Agency
for the
March 1 S 1991
Superior
Desert Water District Hi in Judgement a
MWH
C a unty of San Bernardino 1977 Judgement Company Ltd Case 1Vo 1721 3 Warren Valley
Court of the State of California far the vs
Yucca Water
77 September 16 19
34 Page 4
Projections
INTRODUCTION
projected future water Water demand are based on land development and demand for the District water This section addresses the historical population projections production assumptions used for projecting potable water demands and methodology used for developing potable water This section describes the historical
demand
In this
projections
consumption including
water
section
production projections
water
as
well
demand refers
for water water any unaccounted
as
to
the
the total
amount
of
water
losses
POTABLE WATER DEMANDS Iistarical Water Production and t
Consumption
production and consumption for the period 1992 through 2005 is shown on 1 The average annual water production in this period Figure 3 varies with the highest production occurring in 2003 2002 3 175 acre ftlyr and the lowest the historical annual consumption in 199 1997 2 3 shows production 534 acre 2 ftlyr Figure The historical
water
Table 3 1 and illustrated in
per service connection for the District significantly over the last ten years
The
consumption
per service connection does not vary
Table 3 1 Summary of Water Production and Consumation
Year
Consumption
Water Loss
ftlyr acre
ftlyr acre
ftiyr acre
2 9 10 963 2
2 4 48 636 2
462
16
328
11
2 7 95 897 2 782 2
2 5 00 646 2 449 2
295
11
2 5 34 680 2 776 2
Production
y i
93 1992 1993194 1994195 1995196 97 1996 9 1997 1998199 1999100 01 2000 2001102 2002103 2003104 2004105
9
333
12
2 3 01 416 2 637 2
233
9
264
10
139
5
2 8 23 003 3 175 3
2 6 14 751 2 792 2
209
7
Connections
ftr t2 acre
8 3 27 347 8 378 8
2 7 99 806 2 816 2 820 2
3 1 23 121 3
8 3 93 410 8 442 8 8 4 95 556 8 640 8
8
383
12
2 7 60 838 2
362
12
736 85 8 927 8
9
352 9
283
Maximum
175 3
838 2
Minimum
534 2
301 2
139
MWH
Trended Production
252
462
1 2
percent
251
Note h roquctlon anq
Active Service
Water Loss
16 5
2 8 26 836 2 853 2 2 8 74 901 2 933 2 2 9 74 997 2
352 9
3 1 39 139 3
327 8
799 2
s site web Gonsumptlon statistics obtained from the Uistnct
Represents
Fiscal Year
Production linearized
over
13 years
Page
1 3
Section 3 Water Demand
Figure Summary
Projections
1 3
of Water Production and
Consumption
500 3 Y
3 000 2 500
i
I
4v
2 000 1
500
i
d
000 1 500
a
a a
0
w
I
1993
1995
1999
1997
2001
2003
2005
Time in Years
Water Production
Summary
of
Water Consumption
2 Figure 3 Average Consumption
mmw
Water Loss
per Service Connection
36 0 30 0 24 j 0
d
cC
18 I 0
12 0 06 0 00 1 0 1993
1995
1997
1999
2001
2003
2005
Time in Years
Consumption
MWH
per Service Connection
Page
2 3
Projections
Section 3 Water Demand
Water for unaccounted Tile difference between
water
for water unaccounted
or
and
production loss
water
consumption billed
Relevant
water
to
customers
is defined
loss statistics for the District s
as
water
for water may be attributed to leaking pipes 1 Unaccounted system is presented in Table 3 unmetered or unauthorized water use inaccurate meters or other events causing water to be withdrawn from the system and not measured
overflows hydrant flushing
Specific events that cause water lass include tank cleaning system flushing and hre fighting The average
street
the last 13 years is 10 percent Water are typically less than 10 percent and many have losses of less than 5 water percent annually The District is currently implementing systel the Capital Replacement Program CRP under which sections of pipes with leak history are annual
loss for the District s water system losses r fc well and maintained systems operated water
This would help reduce the
being replaced Historical
Peaking
baseline for
a
and
ADD to estimate MDD and PHD to
size
production 1995
to
water
data
2005
are
are
factor of 1 8 is
conservative
computing peaking
peak hour demand
PHD
factors
factors
These estimated MDD and PHD
The maximum
day
used to scale up the the demand conditions
are
are
distribution system pipelines and facilities Historical monthly and daily used to calculate these peaking factors The historical MDD factors far years 2 The MDD peaking factors MDD ADD varied presented in Table 3
between 1 26 and 1 80 with
peaking
loss for the District
Factors
Average day demand ADD is demand MDD peaking factor used
water
over
the second
an
the last 10 years It is observed that the 1998 compared to other years on record In order to be
6 average of 1
over
unusually high ADD highest MDD
factor of 1 74 will be used for
of the
sizing
facilities Table 3 2
Historical Year
Note
Daily
Demands and Maximum
Day Peaking
ADD
mgd
ADD MDD
1995
50 2
10 4
64 1
1996
59 2
10 4
58 1
1997
48 2
12 3
26 1
1998
26 2
07 4
80 1
1999
39 2
03 4
69 1
2000
44 2
75 3
54 1
2001
57 2
20 4
64 1
2002
63 2
58 4
74 1
2003
82 2
35 4
54 1
2004
81 2
45 4
58 1
2005
79 2
58 4
Statistics
for
2000 1995
presented years Associates 2001 Statistics presented for years 2001 2005 Water
MDD
mgd
Factors
MDD for 2005
are
by Deparsectionent of is provided by the District staff
Systems
issued
are
obtained
obtained
from
the District sWater Master
64 1 Plan
Update John
tgan anti
from the Annual Report to the Drinking Water Program for Large
Health Services
All demands listed in Table 2 include water loss
MWH
Page
3
Section 3 Water Demand
Projections
Diurnal Curves
A diurnal ve cul
curve
represents the
average
hourly
shown below for the District s
demand fluctuation in
water
fluctuation of all the pressure zones combined was recorded far 2005 A system wide diurnal
a water
system represents the on
August 29 2005
curve
was
created by
system The diurnal
average when the
preparing
hourly highest an
demand demand
hourly
mass
using well production reservoir outflows and reservoir inflows This was created based s Supervisory Control an hourly production and tank level information obtained from the District and Data Acquisition SCADA system balance
he diurnal l
curve
generated using
the District s SCADA data had unrealistic variations
on a
This is because average pump flow data rather than instantaneous flaw data generate the diurnal curve In addition the assumption that the levels at Tank 30 and
system basis wide was
used
1 ank 33
to
are
physically
the
same
as
the level
at
Palomar reservoir is inaccurate
located far from each other and
thus
do not follow the
level pattern h1 order to average diurnal curve was to
derive
a new
diurnal
District demand variation patterns This adjusted curve accurately capture the s Figure 3 As shown on Figure 3 the peak hour occurs around the thirteenth
that would
is shown
on
hour of the
day
that has
a
demand of 1 81 times the average demand far that
Figure 3 Adjusted System wide Diurnal
MWH
are
same
atwo running refine the inconsistencies in the diurnal curve hour created from the original SCADA data This curve was then adjusted curve
These three tanks
day
Curve
Page
4 3
Section 3 Water Demand
The diuz lal
is used to
curve
diurnal pattern
multiply the maximum day demand MDD for the hourly variation in demand
to account
Projections
in the model with the
PQPULATI4N
Existing Population 300 people existing year 2005 population of the District is estimated at approximately 21 This population is estimated based on the population projections prepared by the Southern The
California Association of Governments
SCAG 2004
far year 2005
Population Projections The District s service
area
contains the Town of Yucca
The
following assumptions estimates using SCAG population projections
unincorporated
areas
1
The entire
2
here are six Z
population census
s service District shown 3
area
4
on
For Tract
Figure 10403
in its
used far
entirety along
developing
future
with
some
population
of the Town of Yucca tracts
area
in San
These
Valley is served by the District Bernardino County that fall partially or fully
tracts are
within the
listed in Table 3 below and their locations
are
4 3 the
population
within
of tract within District s service
unincorporated
area to
total
area is
prorated
based
on a
ratio of
tract area
percent of the population within the Town of Yucca Valley is 10405 accounted for in the table below It is assumed that all of the unincorporated area in Tract Far Tract
10405
100
lies
outside District s
unincorporated 5
are
Valley
area
service
within District s service
10411
the table below s service District Tract 10412 is
this
tract
boundary
and thus
the
population
far this
is excluded
For Tract 10410 it is assumed that 100
i For Tract
area
percent of the developable land within this
tract
lies
area
100 percent of the population in the Town of Yucca Valley is accounted in It is assumed that the unincorporated area in this tract does not fall within area
fully
contained within the District s service
area
and 100 percent
population in
is accounted for in the table below
100 percent of the population within the Town of Yucca Valley is accounted in the table below It is assumed that the unincorporated area in this tract is For Tract
10413
outside the District s service
MWH
area
Page
5 3
Section 3 Water Demand
Population Projections by TractlD
2000
2005
Table 3 Census Tract for HDWD Service Area
2010
2020
2015
2025
2030
Population Population Population Population Population Population Population 580
10403
10410
10411
789
878
899
963
022 1
081 1
531
583
649
717
782
126
415
496 2
774 2
902 2
09T 3
335 3
542 3
743 3
608 5
086 6
279 6
331 6
450 6
568 6
681 6
071 6
231 6
384 6
531 6
10405
10412
617 5
780 5
10413
319 5
460 5
516 5
304 21
954 21
atal 1
Projections
746 19
848 5
Source Southern California Association of Governments ZUU4
As shown in the table and the
graph
an
905 5
062 6
214 6
533 23
295 24
032 25
741 5 722 22
Nopulauon rro ecuons
Figure 3 5
s current District
population will
increase
This represents a growth of about 17 percent over the next 300 21 000 25 2S years or about 0 7 percent annually Demand projections based on population are shown in able 3 T 4 below Tt is assumed that the demand will track population and also increase linearly from
at an
to
annual
in 2030
about
rate
of 0 7 percent 4 Table 3 Demand
Projection
based
Population
Year
on
Population ADD
mgd
79 2
2010
21 304 954 21
2015
722 22
98 2
2020
533 23
08 3
2025
295 24
18 3
2030
032 25
28 3
2005
88 2
scA 2ao4
2 Actual
vyH
2005 ADD based
on
s District records
Page
6 3
vice Area
racts
N
5000
0
5000
Feej
6 Figure 3 Year 2000 Census Tracts F
Section 3 Water Demand
Projections
5 Figure 3 Population Projections
As shown in Table based
4 the 3
ADD in 2030 is 3 28
This increase in demand and
mgd
SCAG data is very low The District has been adding five percent annually for fiscal years FY 2003 04and 2004J05 on
District
staff
commence
in
and the
knowledge
2007
annual
Due to this low
an
growth
rate
that for the purpose of this demands such as land use
of
growth
project
term demands short
are
rate
of 0 7 percent
Based
plomes
seems
on
population
at a rate
of about
discussions with the
development anticipated
to
low
population projections based on SCAG data it is recommended master plan other methodologies be used to project future water data
demands
at
calculated
discussed later in this section
as
by using general plan representative of the actual growth data is used
home Century 400
services
in
calculated
to
a
new
land
use
data
are
believed
to
For the purpose of this master
build
using
a
out
conditions
linear
growth
Future water demands
be
more
accurate
land
use
section
the
plan general plan
As discussed later in this
and
factor of 2 3 percent
WATER DEMAND PROJECTION METHODOLOGY Future water demands
development
planning
MWH
are
based
on
The District s CRP will
purposes
a
current water
help
water loss factor of 9
reduce the
consumption s system
water
water
percent corresponding
to
loss
the
loss
and
projected
but for conservative
most recent
2004105
Page
8 3
Section 3 Water Demand
Projections
projections Future water demands in the District are based on land use lation and water duty factors WDF To estimate the water consumption for a particular infort the WDF The WDF represents a area the surface area expressed in acres is multiplied by land use type For example the estimated typical water demand associated with a particular water acre commercial area with a WDF of 1 000 gpd acre is SO acres consumption of a 50 times 1 acre which equals 50 000 gpd or 35 gpm 000 gpd data is used for demand
Land Llse
and General Plan land
Existing
information for the District s service
use
area was
obtained from
SANBAG website in GIS format A summary of For planning categories is presented in the Appendix
s San Benlardino Association of Government the
and General Plan land
Existing
use
lumped together For example land Commercial use categories such as General Commercial Mixed Use Commercial Neighborhood 6 shows the land use etc are lumped into a single Commercial land use category Figure 3 5 lists s entire service area used for demand projections Table 3 categories within the District the lumped land use categories used for demand projection purposes land
Water
Duty
use
categories
are
Factors
WDFs for the different land
and
with similar characteristics
use
categories
demand which will
ultimately daily water use
are
account
developed
for
water
to
evaluate future
loss and
water
consumption
consumption
A WDF is the
per acre gpd acre of a given land use type Table s future water demands The method 5 shows the 11 WDFs used for projecting the District 3 used to derive the land use categories listed in the table below is discussed later in detail in this in
average
gallons
per
day
section udder Land Use 5 Table 3 Water Duty Factors Land
use
Abbreviation
T pe
Low
t2
acre d
COM
470
Industrial
IND
310
850
LDR
350
440
MDR
750
Density
h Densit
Residential Residential
Residential
Rural Low Densit Rural Ni
Planning WDF
Commercial
Medium Densit Hi
WDF Calculated acre pd
HDR
280 1
000 1
1 0 25 520 3
Residential
RURAL LD
130
130
Residential
RURAL HD
330
330
0
0
h Densit
Recreational O Non
en
S
ace
NROS ROS PARKS
280
280
Public Facilities
PUBLIG
800
800
Schools
SCHOOL
620
620
ParkslRecreational O
en
S
ace
1 wuhs computed based on global demand sampong 2WDFs used for projecting future demands
MWH
Page
9 3
Legend HDWD Service Area
Existing Land Use
Boundary
Vacant Parcels
Categories Commercial
High Density Residential Industrial Low
Density
Medium
Residential
Density Residential
Recreational Non
Open Space
ParkslRecreational
Aberdeen Dr
Open Space
O
Public Facilities
v
D
c
Rural
High Density
o
s
Rural Low
Mesa Dr
Density I
Schools
N
G7
o
a
ff
a
Vacant
aS Buena Vista Dr
4
Streets
P
l
D d
rns 29 Pa rns 29 pa
N Nv
D
Yucca Trl
Nom
0
o
Pueblo Trl
Onaga
Trl
Joshua Dr
Golden Bee Dr
San Andreas Rd N
4000
0
4000
Feet
Land
use
3 Figure 6 Categories used for Demand Projections
Section 3 Water Demand
Projections
by relating geoeoded spatially referenced billing data to sample areas for each land use type The total water consumption for the sample area divided by the area of the sample yields the WDF for that sample Thus WDFs are expressed in gpd acre The accuracy of this method is dependent on the number of samples collected and the were geographical distribution of these samples over the service area WDFs for the District water over the s District entire service area In this determined by global sampling of demands s service area is assigned a land use category method each geoeoded demand in the District The demands are then summarized by land use category and divided by the total area for each category As al the geoeoded demands as opposed to few samples are considered in the calculation of the WDFs this method of global sampling increases the accuracy of the process Water
duty
factors
are
calculated
planning demand projections a higher WDF is used for industrial and commercial 5 The total area land use types as compared to the calculated WDF This is shown in Table 3 not for these land use is covered during global sampling categories significantly large enough to Based on MWH s extensive planning compute accurate WDFs for planning purposes far communities with similar and land use a higher WDF is used for experience demographics projecting future water demands or fixture F
Based
on
the General Plan land use land
use
for residential HDR
parcels
with
density
a
of 8 tol4
for this land
samples planning experience these parcels were classified as MDR Similarly existing land use categories classified as Mixed Family Residential and High Density Trailer Parks were categorized as MDR Parcels Multi Based on classified as High Density Single Family Residential were categorized as LDR WDFs for and s planning experience the computed MWH Low Medium High Density Residential categories are low Table 3 6 explains the calculation of the revised WDFs for these categories which are used for planning purposes In addition it is assumed that the proposed residential developments will also have additional water usage for irrigation of front yards dwelling units per acre use category revealed
backyards
and
acre du
a
density
are
categorized
as
Several localized
of around 6 du acre Based
on
s MWH
common areas
Table 3 6 Residential WDFs
Land Use
Abbreviation
Type
Law Density
Personsldu
Planning capita Per
Average
consum
duJacre
ption
d
z F W acre gpd
CDR
55 2
5 1
115
440
MDR
55 2
5 3
115
025 1
HDR
55 2
0 12
115
520 3
Residential Medium
Density
Residential
High Density Residential 1
UwelOng Units persons per dwelimg urnt for the uistnct
2 Rounded
cities
MWH
Histoncai SGACi
data
developed by MWH for planning purposes for similar communities The WDFs proposed for the District are significantly lower than the other This is primarily due to very limited landscaping within the District The potable water
Table 3 7 desert
is based on
Values
provides
a
summary of WDFs
Page
11 3
Section 3 Water Demand
usage within the District is
front yard backyard
indaars with very minimal outdoor
mainly
Projections
usage Table 3 7
Comparison Cit
Barstow
HDWD WDF
Land Use
Type
WDF
ac Du
000 2
1 1 21 721 1
1 0 77 137 1
280
350 1
073 1
800
300 1
054 1
000 1
300 3
Industrial
850
Low
Density
Density
Residential Rural
a n
573 1
5 1
135 1
5 1
300 1
1
195 2
0 4
1 025
5 3
000 3
12 6
332 2
6
357 3
5 8
520 3
0 12
799 4
16
807 4
0 18
Residential
High Density Density
a n
an7 n
700
620
a n
047 2
nla
a n
a n
nla
a n
a n
a n
a n
a n
1
Residential SGI1001 Rural
Nigh Density
1 4 0
330
Residential Rural Low
Density
05 0
130
Residential
1 Indicates
that
term Lang The
their full
category was
not included in demand
vacant non
within the District with
remain the
Future
use
some
categories
water
that
within the District s service
The future
will
mainly
have not reached
in the
vacant
parcels
existing parcels For the purpose of demand vacant land use types within the District will non
existing
undergoing densification
occurs on
existing
vacant land will account for
demand within the District
in the District s
growth
area
occur
densification of the
in future while
development
increase in
parcels
land
it is assumed that the same
projections
Projections
development potential
projection
75 0
2 0
Demand
existing
ac Du
440
Residential Medium
ac Du
ac pd
Commercial
Public Facilities
WDF
ac pd
ac pd
S aceJRecreation
Bann in
Palmd ale WDF
ac Du
pdiac
Open
of WDFs
existing
land
use are
To
project
identified
the future
These
majority of growth and demands the vacant
water
vacant
parcels
are
assigned
a
land
type based on the General Plan Future water demands are calculated by multiplying the total area of each vacant parcel by its corresponding water duty factor Table 3 8 shows the use
s District
water
projected
demands
at
different
phases
this report there is only one major development Homes with 1 420 homes is in its planning phase
parcel
on
MWH
development is to development
which this
ciated with this ass
of
development
Mountain The future
be located has been
Vista
adjusted
writing
Project Century Vintage
water to
At the time of
demand for the 475
acre
reflect the actual demand
Page
12 3
Section 3 Water Demand
Projections
Table 3 8 Snmmarv of Prniected
Total Projected ADD Total
Projected
ADD
MUU values
are
obtained
d
m
m
67
percent
develo
d
93 5 values
by
muviHUVradar or
ment
percent
develo ment
93 6
41 3
py muttipry ngHun
100
percent
develo
ment
820 3
year ft acre
Total Pro ected MDD 1
33
of Vacant Parcels
Development
Demands
35 10
763 7
594 11
05 12
18 01
4
200 g Pm prajected ADD at build out condition is about 1035 mgd 7 This is little less than four times the existing ADD Based on a direct correlation between the 8 mgd and a population of 21 35 mgd build out demand translates 300 the 10 existing ADD of 2 rota a population of about 79 000 people at build out condition As shown in the
table
term Demand Short
the
Projection often years 200b 2015 The received from the District staff are used far
knowledge inputs developing these near term projections The major development expected to occur over next ten years will be a 1 420 home development by Century Vintage Homes Ill addition to this development there annual demand
projections of proposed developments
will be
few infill
a
are
developed for
and
projects
a
period
in the Town of Yucca
Valley
within the District s service
area
boundary It is assumed that the
phase starting
Century Vintage
Homes
development
will
occur
in
phases
with the first
construction in 2007 and first batch of names sold in 2008 It is also assumed that
2008 there will be about 200 homes said Based on this assumption all the names in the development will be complete occupied by the year 2015 The total prajected demand far Century Homes development is 0 437 mgd 487 acre yr as shown below in Table ft 9 This is based an an average of 2 3 55 persons per household based on historical SCAC data every year
anti 115
in
starting
gpd consumption
As spawn in Table
139 acre 3 yr feet aver
1 3
per person
the trended
water
production
in 2004 05 This rise in
water
rises from 2 799
production
reflects
93 to acre in 1992 feetlyr a 1 percent growth of 12
This low growth is largely attributed to the 93 percent annual growth 0 moratorium which expired in 2003104 Over the last couple of years the District has
13 years
or
building been experiencing
growth rate of about 5 percent It is unlikely that the District can sustain a percent annual growth rate an a long term basis Thus far the ten year projections rate a linear annual of 23 is used far the infill 20062015 percent growth projects This rate is exclusive of the Homes growth growth resulting from the Century Vintage development an
annual
5
9 The annual increase in system demands over the next ten year period is shown in Table 3 45 71 mgd and total MDD in 2015 is 6 According to this projection the total ADD in 2015 is 3
ingd
MWH
Page
13 3
Section 3 Water Demand
Projections
Table 3 9 term Annualized Demand Projections Shnrt Existin
Water Demand
Centu ADD
Homes
Total Demand
Infill Pro ects
d
m
65 2
00 0
00 0
65 2
2006
65 2
00 0
07 0
72 2
2 007
65 2
00 0
13 0
78 2
2008
65 2
05 0
19 0
89 2
2009
65 2
11 0
25 0
01 3
2010
65 2
16 0
31 0
13 3
2011
65 2
22 0
38 0
24 3
2012
65 2
27 0
44 0
36 3
2013
65 2
33 0
50 0
47 3
2014
65 2
38 0
56 0
59 3
2015
65 2
43 0
62 0
71 3
2005
61 4
00 0
00 0
61 4
2006
61 4
00 0
12 0
73 4
2007
61 4
00 0
22 0
84 4
2008
61 4
09 0
33 0
04 5
2009
61 4
19 0
44 0
24 5
2010 mYmmV
61 4
28 0
55 0
44 5
2011
61 4
38 0
65 0
64 5
2012
61 4
47 0
76 0
84 5
2013
61 4
57 0
87 0
05 6
2014
61 4
66 0
97 0
25 6
2015
61 4
76 0
08 1
45 6
2005 n
MDD
1j
Existing AUU is based
on
the
d
m
Ub reported production forZUU4
2 Existing MDD values are obtained by multiplying ADD values by MDDlADD factor of 3 Century Homes will develop at about 200 homes per year between 200 and 2015 3percent annually 4 Infill projects assumed to occur at 2
74 1
CONDLUSIONS Based the
on
the above discussions of historical
fallowing The
conclusions
existing
are
trended
demands peaking factors
and
projected demands
reached
ADD and MDD for the
District
are
80 2
mgd
and
mgd
87 4
respectively Based
on
historical MDD ADD
facilities in this
master
peaking factors
factor of 1 74 is used for
sizing
the
plan
The build out average day and maximum 01 mgd respectively mgd and 18
day
demands for the District
The term short average
day and
maximum
4 55 ft mgd 1 acre yr
and 6 45
mgd respectively
MWH
a
day
are
estimated
demand projections far the year 2015
at
10 35
are
Page
71 3
14 3
Section 4 Water Resources and
Supply
Assessment
INTRODUCTION
District existing and future potable water water supply sources in relation to future water demands It begins by describing the existing supply and the planning criteria Next future water supply needs are evaluated by comparing the available water supplies with the water demands under future demand conditions This section identifies the supply sources required to meet the projected average day demand ADD and the maximum day demand MDD through build out development Future water supply options are presented to identify those sources that best meet the water supply criteria This section then discussed the existing and future water quality regulations that affect the District It concludes with a water quality evaluation of the existing groundwater supplies and recommendations for This section discusses I4i Desert Water District s
future
supply development
OVERVIEW OF EXISTING WATER SUPPLY SYSTEM The IIi Desert Water District
currently
relies
groundwater supplemented by imparted of potable water The District currently extracts
on
State Water Project
local
SWP water as their source yr from their wells and has a maximum allocation ft acre SWP which is used to recharge the groundwater basin
104 approximately 3 fiom the
system consists of
ion
yr ft acre
plant at 14 boaster 16 26 booster reservoirs pumps agency inter connections storage emergency stations 21 pressure reducing valves and approximately 312 miles of pipeline The focus of this The
existing
watel
18
groundwater wells
of 4 282
one
exchange
treatment
exchange
nitrate removal
two
section will be Water from
on
the
water
nitrate high
supply components
Wells
12E and
7E is 1
treated
at
the ion
facility The facility has a capacity of 2 544 gpm and consists of a raw water balding tank 444 gal ion 62 exchange units a finished water tank 62 000 gal and booster pumps The treated water is blended with water from Well 16E in the finished water tank before being 640 gpm pumped into the system by two booster pumps with a combined capacity of about 1 The District also operates a blending facility 42 004 gal to blend water from Wells 9E and 14F Two booster pumps downstream of the blending tank with a combined capacity of 1 440 uz pump the water back into the g
system
WATER SUPPLY PLANNING CRITERIA The
supply planning
assessment
MWH
to
criteria
determine
outlines the
criteria used in the
whether the District
has sufficient
water resources water
supply
and
under
supply
existing
Page
1 4
Section 4 Water Resources and
demand
satisfy the projected potable water supply planning are conditions to
Meet the A DD
well
out build
Assessment
The evaluation criteria used for
out build
through
Meet the MDD
through
Supply
through
out with all build
wells
groundwater
excluding
the
largest
well
firm
capacity drinking water regulations
Meet the
WATER SUPPLY ANALYSIS
required to meet the water supply planning criteria It first discusses the District s existing water supply sources Next future water supply needs are computed by comparing the available water supplies with the water demands under future conditions Finally the future water supply sources subsection discusses water source options that might be available to the District his section identifies the T
Existing
Water
he District I
Warren
sources
Supply Sources
currently
Valley
Meatls Ames
supply
obtains
water
from three
Groundwater Basin
Valley Groundwater Basin SWP water through
State Water Project Fach of the three
sources
supply
sources
the
Morongo
Basin
Pipeline
is discussed further in this subsection
The District
00 acre 1 yr of groundwater to supply its ft currently pumps approximately 3 Warren The primary groundwater source is the Valley Basin which underlies the Yucca area in San Bernardino The District has pumping rights of 1 622 acre Valley County Warren as as of from the nearby well 800 acre ftlyr from the Valley Basin ftlyr pumping rights customers
Means Ames There
are
Basin
Valley
HDWD 2005d
differences in the
significant
groundwater
basin boundaries in the IIDWD service
area
among various agencies The California Department of Water Resources DWR published an updated version of California s Groundwater Bulletin 118 in 2003 This report includes
descriptions of groundwater basins throughout the state The Mojave Water Agency MWA prepared a regional water management plan in 1994 and updated that plan in 2004 The MWA report contains basin designation with significantly different boundaries than those published by DWR A third source of basin boundaries is local groundwater judgments and agreements A has been for the Warren developed Valley groundwater basin while a settlement judgment Means Valley groundwater basin The boundaries in agreement was approved for the Ames these documents boundaries
are
of the
groundwater rights
hydrogeology
MWH
of the
different from those of DWR and MWA
judgment
and
However
groundwater
agreement
since
they
information
from
Bulletin
form
This section the
118
basis is used
uses
for the to
the basin s District
describe
the
basins
Page
2 4
Section 4 Water Resources and
Supply
Assessment
groundwater wells 15 of which are located along Yucca Creek which two are located on the Mesa area which pump groundwater from the Warren Valley Basin and Four of these 18 wells are inactive hump groundwater from the Ames Basin HDWD 2005b s wells are summarized in Error Reference he physical and operational data of the District T source not found 57 mgd based The total capacity of all groundwater wells is 8 033 gpm or 11 17 on SCh 063 gpm or 10 pump tests The total capacity of the active wells is approximately 7 mgd The firm well capacity is defined as the combined capacity of all operational groundwater wells excluding the largest well With the largest well offline Well 12E with a capacity of 1 467 or 06 or 2 1 1 the firm well is 596 gpm mgd gpm mgd capacity 5 The District
awns
1
purchases SWP water from Mojave Water Agency MWA which is a SWP Beginning in 1995 the SWP water has been used to recharge the Warren Valley Basin after many years of overdraft The District has a maximum allotment of 4 yr of ft 282 acre discussed water from the State Water the Basin As Morongo imported Project through Pipeline later this source provides untreated water that is used for groundwater replenishment Consequently it is not included as part of the production capacity available to meet MDD The District also contractor
h
addition
the District
The District has
an
can
obtain
water
inter connections during emergencies through agency
emergency interne with the Joshua Basin Water District
transferred from the Joshua Basin Water District
temporary
pump and hose connections
connected
to
the
Desert Bighorn
only
le 4 Ta1 1
The District s
View Water District with are nat
considered
a as
pump
water
supply sources
be
system is also
but its
intertie
can
transfer via
through hydrant
the District
John Egan 2001
discontinued in 1996 These connections be used in
to
Water
as
use
was
these should
emergencies
s historical presents HDWD
water
supplies
for fiscal years 1993
through
2005
Table 4 1 Historical HDWD Water
Supplies
ftl acre Fiscal Year
Warren
BDVWA
Valley
Interne
Basin
Ames Means
Total
SWP
Recharge
Basin
316 2
593
0
910 2
0
1994
982 1
573
408
963 2
0
1995
713 1
497
585
795 2
340 1
1996
440 1
713
745
897 2
586 3
1997
955 1
124
703
782 2
776 4
1998
786 1
0
748
534 2
962 3
1999
40 1
0
840
680 2
211 2
2000
198 2
0
578
776 2
633 3
2001
168 2
0
656
823 2
891 3
2002
034 2
0
969
003 3
359 2
2003
721 2
0
454
175 3
987 2
2004
372 2
0
751
123 3
851 2
2005
341 2
0
781
121 3
996 3
1993
MWN
r
Page
3 4
Section 4 Water Resources and
Maximum
721 2
Minimum
440 1 067 2
Avera
e
Assessment
776 4
969
175 3
0
0
534 2
192
632
891 2
713
Supply
0
738 2
reu Valley Groundwater Wat The Warren
Valley
of 26 9 square miles 17 200 acres DWR 2004 to be 000 ft The basin is of the basin 568 acre storage capacity ft KJC 1991 Total usable storage capacity of approximately 160 000 acre Basin
covers
an area
DWR estimated that total
estimated annual
have
to
a
groundwater production
from the basin
was
g during 2 41 acre approximately 3
FY 2004
O5 The Warren
Valley on
Valley
Basin includes the
bearing water
surrounding area The basin is bounded by the bedrock outcrop of the Little San
and the
the south
bedrock constriction called the Yucca barrier and
on
sediments beneath the on
the north
Bernardino the
west
by
by
of Yucca
the Pinto Mountain fault the east
by
a
bedrock constriction and
a
Mountains a
town
on
The
praductive topographic divide between Warren Valley and Morongo Valley DWR 2004 to to consolidated Miocene materials in this basin consist of unconsolidated partly gearing water uatenzary interbedded
MWH
bearing deposits deposits The main productive water and silts deposited by alluvial fan systems gravels conglomerates
continental
are
unconfined
Page
4
Section 4 Water Resources and
Supply
Assessment
Table 4 2
Groundwater Well Characteristics SCE
Design No
Location
Status
Basin
Depth
Capacityy n C9P t
10W
Sunland Dr W of Miami Tr
Warren Valle
Active
020 1
220
11W
Cassia Dr
Warren Valle
Active
860
550
12E
Cassia Dr
Warren Valle
Active
800
200 1
District Yard
Warren Valle
Active
Warren
Valley
Active
Warren
Valley
Active
14E 16E
Sage Lea
17E
ue
Sage Lea
Ave South of Little
Pm
t t
251
1 0 17 467 1
700
658
270
219
400
380
270
269
378
100
96
X04
80
80
730
150
157
1 1 15 450 1
Dr
Ave South of Little ue
Pump
800
Dr Warren Valle
18E
Crestview Dr
2W
Pioneer Town Rd Sunland
Warren
Valley
Warren
Valley
Active
000 1
Active
Dr
3W
Off of Church St N of 29 Palms Hw Balsa Ave and Paxton Rd
Warren Valle
5W
5E
Luna Vista Ln
Warren Valle
6W
Co ate Tr
Warren Valle
Theatre Rd
Warren Valle
8W
Yucca Tr
Warren Valle
Active
9E
District Yard
Warren Valle
Active
Sunland Dr W of Cherokee
Warren
Active
7E
9W
Active
Active
Valley
90
90
757
425
428
c
700
700
250
238
800
400
357
990
800
837
Tr a
10E
Mesa Dr
24E
Warren Vista
Total Well
Capacity
Active
all
Capacity
System
535 6
063 7
for the
System
505 7
033 8
335 5
596 5
wells
Firm Well minus i
100 689
for the
active wells
Total Well
100 800
Capacity active largest well 12E
wells
Design capacities provided by the District obtained from SCE pump test points
2 Information
3 Design capacities Groundwater
used where SCE test
Adjudication
capacities
of Water
were
not available
Rights
The basin
began
to
be overdrafted in the 19SOs
KJC 1991 Concerned about significantly increasing the overdraft the District filed a complaint against the Yueea Water Company Ltd et al for adjudication of the groundwater in 1976 In 1977 the Superior Court for the County of San Bernardino issued its judgment for adjudication Although the native yield of the basin from precipitation and runoff does not exceed 200 acre yr the Court recognized the need to issue groundwater rights in excess of the ft s safe basin
resulting local economic growth could support the cast of a solution to the overdraft 3 Accordingly rights to the basin groundwater were issued as listed in Table 4 administer the of the the Court To provisions DVVD 2006a i adjudication judgment appointed the District as the Watermaster for the basin and ordered the Watermaster develop a physical lutian s
MWH
to
yield
so
that the
the overdraft
problem HDWD 2005e
Chilton Jerks Kennedy
was
hired
to
5 Page 4
Section 4 Water Resources and
fonzlulate the solution
adopted
on
the Warren
Valley tansan 2005 i
as
1991
May 10
Basin
Management Plan
Supply
Assessment
which the Watennaster
Table 4 3 Warren
to the
Party
Valley Groundwater Adjudication Pumping
ftlyr acre
Adjudication
Production
Average
ht
Ri
Between
20002005
ftr acre
Desert Water District Hi
896
Yucca Water Com
an
726
Blue Skies Countr
Club
585
268
80
14
Institute of Mental Ph sics 16 individuals for small domestic
16
uses
2 3 4
16
303 2
Total eulstnci r
1
391 2
acquired the Yucca water e ompany m
Assumed to be 1
ftlyr acre
per
producer
per
689 2
ayu
Not included in watermaster
judgment
report
HDWD 2005e Hanson 2005
Safe Yield The current average yield of the Warren Valley Basin is estimated to be 820 acre ftof natural recharge 820 acre yr which includes 80 acre ft yr of septic and irrigation return ft and 80
ftlyr acre
Natural
recharge
of subsurface outflow to
the basin is
mainly from
streamflow from Water
ephelnerai
Percolation of septic tank effluent
2004
As
growth
occurs
in the
Canyon
basin
the
to
the basin based
on
the Yucca Barrier
in the north and
significantly
contributes
amount
report it is assumed that 32 percent of the a u rett
Grady 2006 HDWD 2006a direct percolation of precipitation and percolation of
across
to
Covington Canyon in the south the recharge of groundwater DWR
of return flow is
groundwater pumped
the ratio of estimated
returns to
expected
to
increase For this
from the Warren
average
production
Valley
Basin
in the Warren
Valley Basin aesfMeans Ar
Valley
Groundwater Basins
section the AmesiMeans Valley Groundwater Basin includes portions of the Ames atad Copper Mountain Valley basins as designated by DWR The surface area of the Ames Valley Basin as defined in the Ames Valley Water Basin Agreement 1991 is approximately 900 acres The following basin descriptions are based on information in Bulletin ll8 DWR 49 2004 As used in this
7 square miles 1 0 000 acres The basin is Valley Basin covers an area of 169 rocks of the San Bernardino Mountains on the west Iron waterbearing bynon Ridge on the north and Hidalgo Mountain an the northeast The Emerson Copper Mountain and West Calico fault also form parts of the eastern and northern boundaries A surface water drainage divide with the Copper Mountain Valley Basin forms the southern boundary The total storage ft DWR 2004 200 acre 1 capacity is estimated to be 000 The Ames bounded
The
Copper
Mountain
basin is bounded
by
4 square miles 30 Valley Basin covers an area of 47 300 acres The on the north by a drainage divide with the Ames Valley Basin and on the south
the Pinto Mountain fault
MWN
The
non rocks waterbearing
of the
Copper
Mountain and the San
Page
S 4
Section 4 Water Resources and
Supply
Assessment
boundaries respectively excess of 000 ft DWR 2004 000 acre 1
Bernardino Mountains farm the eastern and western basin
storage In
capacity
is estimated in
The total
Development Company to locate and 500 acre yr ft capable of producing 1
1987 the District contracted with the Mainstream Water
develop
a
well outside the Warren
Valley
Basin that is
placed within the Sphere of Influence of the Desert View Water Agency one of the predecessors to the Bighorn Desert View Water Agency BDVWA A well Ames was successfully drilled in the 00 acre Valley Basin capable of producing up to 2 yr ft In 1989 environmental litigation with the BDVWA prevented the use of this well In 1991 a 5 rt settlemei ftlyr plus 0 agreement between the two parties allowed HDWD to extract 800 acre fttyr for each new residential meter installed after approval of the agreement The acre agreement provides that water pumped from the Ames Valley Basin can only be used to serve In 1993 Well 24E was put into operation HDWD 2006a customers within that basin informal Through agreement with BDVWA the District limits its pumping from the Means Valley to about 650 acre Ames yr until a recharge program is implemented ft The
proposed
State Water
well site
Project
was
Water Artificial
Recharge
largest water source for the Yucca Valley area SWP water is brought the area via the Morongo Basin Pipeline MBP a 54 million project mile pipeline beginning at the California Aqueduct in Hesperia The capacity consisting of a 71 of the pipeline provides for the delivery of excess water when available In June 1990 the voters thirds vote h1 approved the financing plan for the Morongo Basin Pipeline by more than atwo MBP SWP water the lanuary 1995 the District started importing through State Water
Project SWP
water
is the
to
Agency is one of the 29 SWP contractors It provides wholesale water to the Hi Desert Water District Desert Bighorn View Water Agency Joshua Basin Water District and Service Area No 70 Improvement Zones W 1 and W 4 MWA Ordinance No 9 U1ty Co included as Appendix C establishes the rules and regulations for the sale and delivery of SWP
Mojave
Water
water
In
1991 when the MWA anal
HDWD
signed
the MBP
Agreement
to allocate the water MWA
ftlyr Of this amount Improvement District M the 50 00 acre seventh or a 7 257 acre yr and the ft designated service area for the MBP was entitled to one District has a contractual allocation of 59 percent or 4 282 acre ftlyr I IDWD 2006x The had
a
SWP Table A amount of
provides that MWA may deliver additional SWP water to MBP project participants subject to project capacity The agreement defines the project peak delivery capacity as 15 cubic feet per second cfs or 10 900 acre ftlyr if operated continuously According to MWA the addition of a second pumping station along the pipeline has increased this capacity to 22 cfs 10 acre 9 15 yr if operated continuously MWA 2006 Based on this capacity it is possible ft I I DWD to obtain additional water for for groundwater storage if water is available from MWA agreement
000 acre acquired an additional Table A amount of 25 yr from Berrenda Mesa ft Water District a member agency of Kern County Water Agency increasing its total Table A anzoutit to 75 800 acre ftlyr According to the terms of the MBP Agreement this increased In
1998
Table A
MWA
amount
would
agencies Instead
MWH
not
increase the
amount
of
water
available for the MBP
the SWP allotment for the MBP would be based an the
contracting 50 acre original 800
Page
7 4
Section 4 Water Resources and
Supply Assessment
ftly Talale A amount but project participants may request additional water deliveries up to the r s capacity if MWA has not contracted with other water purveyors for this additional project water Ongoing discussions continue as to whether he District and others within Improvement District M are entitled to a proportionate share of the additional 25 000 acre ftlyr If this is resolved favorably the District s annual allotment could potentially be increased to 6 390 acre MWA on an a If not the District would be able to purchase additional SWP supplies from Itty available basis in accordance with MWA Ordinance No 9 as
Based have
on
DWR
operational
teen along
exports
to receive
studies
published
in
deliveries of SWP water
2005
average of 77 percent of the Table A
297 acre 3 ftlyr
on
average
amount
are
Consequently
expected
to
the District
HDWD 2006a
Pipeline Agreement continues until the earlier of i the date which all Bonds issued have been retired or full provision made for their retirement including interest until their retirement date or ii fifty 50 years The District estimate that the bonds will be paid off in 2023 but it could be earlier based on the current rate of population growth Whether the District will be able to secure firm SWP allocation beyond 2023 is unknown at this time The MBP Agreement states that water service would be subject to sopinion that sagency MWA wide policy for the sale of water in effect at that time It is MWA The
term
of 1991
Basin
Morongo
on
the District will have boundaries water to
in
The District has
the District
Appendix
D and
beyond
reliable
are
sources
SWP water with
all the other
confirmation from MWA of its
requested
is estimated
susceptible
According
to
reductions
to DWR
to
to
yield
an
are
their SWP
attached
E respectively
during drought
studies
and thus are
are
not
expected
HDWD this range 1992 the SWP supply period 1990 A contract amount or 1 113 acre yr ft
contract amount
average of26 percent of the Table
years
future Table A deliveries
100 percent of the Table A range from 5 percent would be 214 to 4 282 acre yr For the driest three year ft to
agencies within ability to supply
2023 The letter to MWA and the response from MWA
Appendix
SWP Table A deliveries
completely
compete for
to
For
signed a Conjunctive Use Agreement with MWA in 1994 that provided the tunity to import additional water through the MBP for recharge into the Warren Valley oppoz Basin The District was able to directly purchase the water stored in the basin by MWA hi ft of conjunctive use water In 2004 the District 500 acre 2001 the District paid for almost 1 and MWA re the negotiated Conjunctive Use Agreement to provide greater flexibility to both agencies Terms of the agreement include no agreement expiration no limit to the amount of water stored in the basin MWA is responsible for the cost of transporting the water to the recharge basins and the cost of water itself withdrawn from the banked water can begin only after the initial storage threshold of 2 ft is reached and the District will provide water 500 acre The District
Isom its SWP allocation if MWA requests a withdrawal Both agencies plan to store a total of 2012 HDWD 2006a 900 acreft of conjunctive use water in the basin between 2006 12 Water received
from
the MBP
is
recharged
into the
Warren
Valley
Basin
through
two
Valley percolation ponds owned and operated by HDWD These sites are located west DWR and of 247 and south of Drive 2005d 2004 Airl7art Highway Sunnyslope HDWD a yr Recharging the ft Historically these basins have combined recharge capacity of 5 000 acre near
MWH
the Yucca
Page
8 4
Section 4 Water Resources and
water
eliminates the need
to construct a treatment
biter Three additional basins will increase the total
plant
because
recently constructed 000 acre ftlyr recharge capacity to 11
east
were
Supply
percolation
Assessment
acts
of Pioneertown Road
as
a
natural
These basins
Future Water Demand
supply capacity must be sufficient to serve the projected water demands out with adequate redundancy for emergency conditions Table 4 shows the through build s projected water demands at different phases of development The methodology used IJistrict for developing these water demand projections is discussed in Section 3 The available
water
Table 4 Summary of Projected Demands Development of Vacant Total Projected ADD
m
Parcels d
Total Projected MDD are
obtained
m
percent
develo
80 2
Total Projected ADD acre ftr
1 MUU values
33
Current
d
ment
66 percent develo
41 3
137 3
93 6
820 3 93 5
87 4
meat
100
percent
develo
ment
35 10
763 7
594 11
05 12
18 01
AUU tactor of 14 by multiplying AUU values by MUU
Demand
projections aver the next five year period 2010 2006 for these is also discussed in methodology developing projections
are
5 The shown in Table 4
Section 3
Table 4 5 term Annual Demand Projections Near Water Demand
Existin
Homes
Centu ADD
m
Infill Pro ects
Total Demand
d
2005
65 2
00 0
00 0
65 2
2006
65 2
00 0
07 0
72 2
2007
65 2
00 0
13 0
78 2
65 2
05 0
19 0
89 2
2009
65 2
11 0
25 0
01 3
2010
65 2
16 0
31 0
13 3
2011
65 2
22 0
38 0
24 3
2012
65 2
27 0
44 0
36 3
2013
65 2
33 0
50 0
47 3
2014
65 2
38 0
56 0
59 3
2015
65 2
43 0
62 0
71 3
2008
MDDmd
MWH
2005
61 4
00 0
00 0
61 4
2006
61 4
00 0
12 0
73 4
2007
61 4
00 0
22 0
84 4
2008
61 4
09 0
33 0
04 5
2009
61 4
19 0
44 0
24 5
2010
61 4
28 0
55 0
44 5
2011
61 4
38 0
65 0
64 5
2012
61 4
47 0
76 0
84 5
2013
61 4
57 0
87 0
05 6
Page
9 4
Section 4 Water Resources and
mm rv
1
Supply
Assessment
2014
61 4
66 0
97 0
25 6
2015
61 4
76 0
08 1
45 6
m
EXISting ADU IS based on the reported prodUCtiOn torLUU41Ub ADD factor of 1 74 Existing MDD values are obtained by multiplying ADD values by MDD
2 3 Century Homes will develop at about 200 homes per year between 2008 3percent annually 4 Infill projects assumed to occur at 2
Comparison
of Demand and
hable 4 6lists the average
and 2015
Existing Supply
yield
maximum
capacity
and firm
supply capacity
for each
existing
water source
6 Table 4
Existing
Valley Valley
Imported
SWP Water
Net Water 1
Firm
Groundwater
capacity
r
Firm
Capacity an
d
Gapacity an
d
522
17 9
20 6
650
00 1
00 1
297 3
as
the
17 10
469 4
Supply Capacity is defined
Max
Yield
ftJ acre
Groundwater
AmeslMeans
Supply Summary
Average
Supply Source Warren
Water
groundwater production capacity
with me
20 7
nitrate treatment plant out or service
year average pumping by Average yield is based on the safe yield of the Warren Valley 820 acre yrless the recent five ft Blue Skies Country Glub 268 acre ftlyr Institute for Mental Physics 14 acre yrand minimal producers 16 acre ft yr ft Average yield is based on the existing agreed upon pumping from the AmeslMeans Valley The allowed pumping of the Means Valley is 800 acre Ames 5acre fttyr 0 yrper connection installed since January 1991 ft The is estimated to be 77 of the contractual Table A amount based on DWR studies DWR SWP 4 term average long supply 2005 No production capacity is included since this supply is used for groundwater recharge 2
compared with the projected ADD to identify a supply surplus or existing water supply is 4 469 acre ftlyr This is significantly than the ADD of the five which was 82 mgd 3 2 past 159 acre yr in ft greater highest years are 2003 section 2 Therefore it is concluded that the District s existing supplies adequate to The average yield is typically deficit The average annual
its
meet
basin
existing
reserves
demands
during
ui the Warren
an
Valley
average year with an surplus supply being used Due to the variabAlity of the SWP supply during
to
build
a
single
yr Under these conditions ft dry year SWP supplies could be reduced to as little as 214 acre and the difference would be made up through recovery of demands would exceed supplies
previously stored The firm meet
SWP water
supply capacity
is
projected MDD to verify the ability to groundwater capacity is defined as the combined out of service In this case the largest source is the
typically compared
with the
seasonal variations in demands The firm
capacity
of all wells with the
largest
source
6 mgd As shown in Table 4 G the 500 gpm or 3 plant capacity of 2 57 17 mgd while the existing firm supply capacity is 6 existing maximum supply capacity is 10 are MDD in the five which Both than the past greater highest experienced years mgd capacities was 4 58 mgd 5 yr in 2005 ft 130 acre nitrate
treatment
With this
supplies future
MWH
comparison
are
water
sufficient demands
with
a
of the demands and to meet are
the ADD
projected
to
as
supplies well
increase
as
it
can
be concluded that the
the MDD for the
significantly
as
water
term
I4awever the
earlier
To determine
near
presented
existing
Page
10 4
Section 4 Water Resources and
when floe District needs additional availalale
water
for the
supplies
ondition 1 Meet the ADD C
water
supplies
through
Condition 2 Meet the MDD
projected
demands
are
compared
with the
conditions
two
following
the
Assessment
Supply
out build out with build
through
largest
source
nitrate plant
out
of
service he supply and demand
comparisons
for each of these conditions
are
presented
in Table 7 4 and
Table 4 8
Condition 1 Meet ADD results of the evaluation
Table 4 7 shows the
evaluation several assumptions
Valley Basin
will increase
from
estimated
use
This is are
are
to
as
are
made
First
to
increased growth occurs due based on an yr ft acre average
returns
be 820
32 percent of the average remain at this percentage if no changes
ation uiader the allac
and demands
from
water
For this
yield of the Warren Currently returns
use use
of
yr ft 575 acre 2
in the past 13 years Returns from use occur in the current method of wastewater
water use
It is also assumed that other
disposal
supplies
it is assumed that the
to
approximately
assumed
of annual
judgment
of 615
producers
in the Warren
Valley
will
extract
their full
ftlyr acre 7 Table 4
Future Water Needs Evaluation Condition 1 Meet ADD Demand
Supplies acre yr ft Ames Warren
Year
Valle Yield
Means
SWP
Total
Valley
Water2
Supplies
956
650
2006
977
650
297 3
2007
994
650
297 3
2008
026 1
650
297 3
2009
060 1
650
297 3
2010
083 1
650
297 3
33 Uev
163 1
650
297 3
035 2
650
297 3
794 2
650
297 3
66
rev
lDev 100
Other DWD
Warren
297 3
otal
Valley
Basin
200 5
yr ft acre Surplus
4 deficit
968 2
615
583 3
320 1
924 4
046 3
615
661 3
263 1
941 4
114 3
615
729 3
212 1
973 4
237 3
615
852 3
121 1
007 5
371 3
615
986 3
021 1
030 5
506 3
615
121 4
909
110 5
820 3
615
435 4
675
gg2 5
763 7
615
378 8
396 2
741 6
594 11
615
209 12
468 5
903 4
2 3
valley yield is based on estimated returns rrom use of percent or appiieo water SWP supply available for HDWD is assumed to remain at 77 percent of the current allocation of 4 282 acre ftJyr Other Warren Valley pumping is based on the rights of Blue Skies Golf Course Institute of Mental Physics and private
4
pumpers Deficit shown
1
Warren
A second
represents
assumption
the difference between
supply
is that the estimated
increase consistent with
and
demand
production
from the Ames Means
Valley
Basin will
growth as defined in the Settlement Agreement Valley yr based on production in ft currently about 650 acre the past five years At full development the Ames Means Valley area will have a demand of S The Settlement allows the District to increase its pumping by O 478 acre 3 Agreement yr ft projected
Demand in the AmeslMeans
yr far ft acre
MWH
every
new
residential area
is
residential connection in this
area
Based
on
current
usage patterns
Page
11 4
Section 4 Water Resources and
growth
is
expected this
agreement
to result in about
would allow
the
200 7
maximum
Supply
Assessment
Under the
additional connections at build out
pumping
to
increase from
800
yr ft acre
to
400 acre approximately 4 ftlyr Since the agreement limits pumping to demand in the out An analysis AmeslMeans Valley the maximum pumping could be 3 478 acre yr at build ft of whether the available yield of the Ames Means Valley is adequate to support this level of not in the scope of this current investigation For this study it is assumed that the pumping is AmeslMeans Valley basin cannot support this level of use under current supply conditions ftlyr production is therefore limited to 650 acre
assumptions existing supplies are adequate to meet annual demands through 2010 However future development at about the 40 percent level and beyond shows a supply shortage under average conditions Additional water supplies would be needed to support out would be 5 468 acre yr ft th beyond the 40 percent level and the deficit at build grov Based
on
these
Condition 2 Meet MDD with the Firm Well
Capacity
Table 4 8 shows the results of the evaluation of maximum
day supplies
and demands
Far this
existing supplies are adequate to meet annual demands through 33 percent development However future development at the 66 percent level and beyond shows a supply shortage under maximum day conditions primarily due to a lack of pumping capacity of the existing wells New wells will need to be drilled to meet the peak demand As discussed under Condition 1 it is also due to a reduction in the safe yield of the Warren Valley Basin condition
additional
8 mgd is expected without Consequently a future supply deficit of up to 10 additional water sources production capacity would production capacity Without augmented when development approaches the 33 percent level
need
to
be
Table 4 8 Future Water Needs Evaluation Condition 2 Meet MDD with Firm Well Supplies Demands
Capacity
33
66
100
Dev
Dev
Dev
20 6
20 6
20 6
20 6
00 1
00 1
00 1
00 1
00 1
0
0
0
0
0
0
2005
2006
2007
2008
2009
2010
20 6
20 6
20 6
20 6
20 6
1 00
00 1
00 1
00 1
mgd Warren Wells
Valley
i t
Ames
Valley
Groundwater
0
SWP Water Total
Supplies
MDD
Deficit Surplusl rirrn weir
2
capacity
0
20 7
20 7
20 7
20 7
20 7
20 7
20 7
20 7
20 7
61 4
73 4
84 4
04 5
24 5
44 5
93 5
06 12
18 01
96 1
76 1
27 1
86 4
81 10
59 2 of the warren
SWP water is used
0
47 2 vaney
wens
36 2 exauaes
16 2 nitrate
ants p
zu a
mga
for groundwater recharge and does not contribute to maximum day production capacity
OIIC1USlo11 C
existing supplies are not sufficient to meet the future water demands so the District must develop additional production capacity before demands reach the 33 percent term supplies before development level In addition the district must develop new long It is concluded that the
yyH
Page
12 4
Section 4 Water Resources and
Supply
Assessment
development reaches the 40 percent level It should be noted that availability of SWP water for groundwater replenishment may change after 2023 when the MBP bonds are paid off After this Hh may need yeas WD
compete for available SWP supplies with other
to
MWA member
agencies fo address the future
deficit identified under both
supply
available to the District The potential future Future Water
Supply
many supply options discussed in the next section
conditions
supply sources are
Sources
Based upon supply demand evaluation the District will need at least S S00 amount to This could decrease about if the Ames supplies 700 acre 2 yr ft sustain the future
developed based Basin
allowed in the Settlement
pumping supply
water
on
in addition
the
Agreement
discussed include
sources
to
existing supply
potential
sources
without addiltial water
supply
These future
yr of new ft acre
Valley
replenishment
sources
supply
Basin
Plan These
potential
Negotiate long term agreement
can
The
that could be
sources are
identified
discussions with District staff and recommendations from the 1991 Warren
Management
are
Valley
sources are
with MWA for SWP
water
Obtain increased SWP allocation from MWA
Develop Water
a
water
exchange
Conjunctive Drill
new
use
supply
outside District boundaries
with MWD with MWA
wells in Warren
Construct surface
Valley and Ames Valley
water treatment
Purchase temporary
surface
Water conservation
measures
Recycled
Basins
facilities
water
supplies
water
Desalination
Negotiate Long term Agreement The
current contract
bonds 2023
far the
with MWA for SWP Water
Morongo
Basin
Pipeline
with MVVA is
set to
terminate when the
50 years 2041 whichever comes first The bonds are estimated to retire in After this time the availability of SWP water to HDWD and other MBP participants
are
retired
or
would be
s agency subject MWA wide policy on the sale of water as defined in Ordinance No 9 sSWP allocation is not fully utilized by its member agencies however growth Cuhrently MWA is expected to result in full utilization by 2028 MWA 2005 To ensure long term supply availability HDWD could negotiate an extension of the term of the SWP allocation at least for of MWA s SWP contract 2035 In the absence of such a commitment HDWD would need written assurance that MWA will obtain adequate imported water supplies to meet the the
term
future demands of IIDWD and other
MWH
agencies participating
in the MBP
Page
13 4
Section 4 Water Resources and
btain Increased SWP Allocation from MWA C MWA has
However the s MWA its
to
Table A amount
390 acre 6 yr ft
to
Others
for up to 75 800 acre yr of Table A water ft states that the basis for SWP supply allocation will be
seventh of If MWA agrees to allocate one the MBP participants HDWD could have its SWP allocation Table A amount
800 acre yr ft original 50
current
increase
specifically
MBP agreement
Assessment
water contract
SWP
existing
an
or
Supply
Using
the
estimates of SWP
recent
this increase could
reliability
623 acre 920 acre yr an increase of 1 ft provide the District with an average SWP supply of 4 the future allocation of SWP going discussions with MWA regarding yr The District has on ft water
The MWA 2005 Urban Water
Plan
Management
conservation of 10 percent the full available SWP 800 acre ftlyr 2030 MWA may have a deficit of 2 estimates between 2005 and 2028 indicate
a
Update supply
that assuming municipal by about 2028 By
indicates
will be needed
s Evaluation of MWA
cumulative
surplus
of supply
supply
over
and demand
demand of about
HDWD could
purchase some additional average supply in the from MWA when it is available for Warren SWP storage Valley Basin In addition HDWD is the only MBP contractor that is utilizing SWP water HDWD could utilize the unused conditions
160 000 acre ft assuming water
capacity
in the MBP
to
import
additional
water
when available
MWA 2005 MWA estimated that under feet per year will be needed by 000 acre 95
In its report Post 2020 Wate7r Supply Options different growth scenarios an additional 57 000 2050
MWA has initiated efforts
obtained
banking
MWA has
of conservation
has yet
growth
to
be examined
water can
to
large
needs
so
some
of this
Monterey Amendments Tabic A amounts from all of this
agencies
water
groundwater banking Metropahtan and feasibility of specific
Valley
term water supply relatively reliable long and replenish the groundwater basin The
and
area
1998
water can
agricultural
in the Central
Valley
provide
to
are
or
occur
in
excess
of their
for the transfer of
committed for
may still be interested
anticipated
the District s SWP contractor
The of the
130 acre 000 yr ft 2006 essentially transfer However some agricultural in transferring water if the price is
contractors to urban contractors
has been transferred
between
willing acquired 25 000 acre yr of Table A water ft Monterey Amendment Several SWP contractors
be transferred
the SWP contracts
to
to
MWA
their subunits have indicated that their Table A entitlements
water
The
underway
are
the SWP contracts allows transfers
Effective in
willing buyers
a
from Ben enda Mesa Water District under the or
term ashort
MWA 2005
provide
in the Yucca
Amendment
Monterey
recently negotiated
Water District of Southern California
Additional SWP Table A accommodate
new
Metropolitan term banking project larger long
a
2020 options 17ost
sellers and
supply might be appropriations water
options include pre banking existing supplies water transfers exchange arrangements developing water conservation or of existing supplies including exploring higher credits and aggressive management
discussions for
995 1
where this additional
sources
of
arrangement with the
to
determine
Potential ar
desalination levels
to
to
As of late
acceptable The District should work transfer
Such
be allocated
WH
to
availability of Table A water for transfers should be made with the understanding that the water would specifically the District or MBP participating agencies closely
with MWA
to
explore
the
Page
14 4
Section 4 Water Resources and
Ln addition
to
MWA
the District should
Supply
explore supply opportunities with
other
Assessment
regional
water
in the very early stages of Valley agencies example investigating the construction of a desert aqueduct to convey SWP water to the Coachella Valley Two principal alignments are under consideration a Pass Route roughly paralleling For
Water District is
the Coachella
roughly paralleling the MBP alignment This project may larovide significant partnering opportunities and could substantially improve supply reliability for It is recommended that the District staff discuss potential participation in the the District Interstate 10 and
a
Desert Route
VWD project C
Develola
a
Water
Supply
Outside District Boundaries
possibility of developing a water supply in the service area of another water district and exchanging SWP water for the new local supply This could be possible within water districts that have low quality water sources such as wastewater effluent or groundwater with high dissolved solids content that cannot be utilized without costly treatment Because to the many areas have access to less costly water supplies the value of imported water is higher District Thus the District maybe able to develop water supplies which are more expensive than the existing water supplies in another area but less expensive than the cost of imported water to e District The other water district would likely need to have a contract for SWP water which tl can be conveyed to the Yucca Valley area through the Morongo Basin Pipeline KJC 1991 There is also the
exchange might be financial participation in the development of a recycled water ar seawater desalination project near the coast The District could purchase a portion of the project capacity and through a water exchange would receive SWP water through MWA and the MBP This would require multiple interagency agreements between the project particilaants An
example
Water
of such
a
supply
and
Exchange
MWA is
expected
to
have
an
estimated
000 160
ftof unused SWP acre
supply
between 2405 and
supply would be to transfer a portian of it to another party as part of a storage agreement or exchange program In 2003 MWA and Metropolitan agreed on a Water Exchange Pilot Program with the goals of facilitating a water exchange in the short term and helping to determine the feasibility of a similar long teen exchange program between the two agencies Under the terms of the Pilot Program Metropolitan will deliver to Mojave up to feet acre of its SWP deliveries or other water In exchange in years when Metropolitan 000 75 s SWP requests water MWA will provide Metropolitan water through exchange of MWA In deliveries for that year less MWA s current demand of 5 2005 MWA 000 acre ftlyr amended the existing demonstl ation water exchange agreement with Metropolitan to extend the until storage period February 2006 anal allow Metropolitan to call back the water until December 2028 C ne
option
for
utilizing
this
2015 program in place with the 5olano County Water Agency WA This agreement allows MWA to receive entitlement deliveries from the SCWA during SC hydrologic periods when the SCWA has approved entitlement in excess of their needs MWA
MWA also has
will
MWH
an
subsequently
entitlement
exchange
allow the SCWA to utilize
some
of their
approved
entitlement
during periods
Page
15 4
Section 4 Water Resources and
of d ought but not delivered
than half of the
MWA It is
to
quantity
previously
some
to
Use and Groundwater
been
more
supply
Although these water exchange programs do not directly affect BDWD storage Warren Valley Basin could reduce pumping lifts and improve water quality
Conjunctive
Assessment
than its full years MWA could receive basin recharge alternatives designed to use SWP
that in
possible
of SCWA entitlement that has
these programs Therefore should consider the effects of a variable water
entitlement due water
more
Supply
of
water
in the
Storage
Agreement with MWA in 1994 that provided the en Valley opportunity to import additional water through the MBP for recharge into the Wal to the water stored in the basin Basin The District was able by MWA h7 directly purchase ft of conjunctive use water In 2004 the District 2001 the District paid for almost 1 500 acre 1VIWA and negotiated the Conjunctive Use Agreement to provide greater flexibility to bath re agencies Terms of the agreement include no agreement expiration no limit to the amount of water stared in the basin MWA is responsible for the cost of transporting the water to the recharge basins and the cost of water itself withdrawal from the banked water can begin only ft is reached and the District will provide water after t11e initial storage threshold of 2 500 acre from its SWP allocation if MWA requests a withdrawal Both agencies expect to store a total of ftof conjunctive use water in the basin between 2012 2006 HDWD 2006 900 acre 12 The District
Such
a
signed
conjunctive
use
Use
Conjunctive
a
project
could be
expanded to increase the amount of storage Again be pre delivery of MWA water when it is available
benefit of this program would later use during droughts or periods of reduced MWA SWP deliveries
primary
reliability
for HDWD but would not alter the
of
supply delivered water would be a credit against pre As discussed store cost
the
previously
water
for its
future
implement
use
not
The
average
for
This increases the
supply
because the
future deliveries
the District could also pre purchase SWP
own
of water for storage that may
District could
term long
the
water
principal shortcoming
be recovered
through
approach
is the initial
sales for many years The apply to new connections to
customer
that would
water
when it is available and
of this
purchase charge purchase and stare this water The supply would be limited by pre the available capacity of MBP and HDWD s ability to recharge the water However there is ently unused capacity in the MBP since other MBP contractors are not using this supply clal ate sufficient funds goner
a
to
The HDWD Board has
defines the amount of
allowed based
reserve
This
policy
on
04 that implemented Polley No 26 levels of prescribed groundwater storage
is described in
more
detail later in this section
curtailed if the minimum storage reserve the storage reserve exceeds five years
effective consider
IdDWD should establish
a
drops
basin
To
below ensure
growth
that is
Valley
Basin
policy requires growth to be three years there are no growth limits if that growth limitations do not become
This
that exceeds five years This reserve should during extended dry periods potential for water
reserve
anticipated reductions in SWP supplies quality degradation and uncertainty in local water supplies supply contingencies to determine a specific reserve volume
MWH
in the Warren
HDWD should evaluate
potential
Page
16 4
Section 4 Water I esourees and
Supply
Assessment
Drill New Wells If FIDWD continues wells
uct new const7
reement allows A demand
rely
on
future MDD
to meet
increased
day
demand of 6 8
mgd
Additional wells would also be out in this build
If
area
0 5
wells have similar
wells with
required
mgd
AmeslMeans
area
a
to
at
the
new
this demand
to meet
to
The
current
wells
existing
The estimated
400 acre 4 9 mgd yr 3 ft
Valley portion firm
area
with
of at least 5 8
new
with
a
wells
mgd
of the basin The MDD at
supply
in Warren
Valley
is
would be needed 65 rngd about 0 Valley and
wells in the Warren
Whether this number of
new
per well
nine
new
on
an
wells
wells could be located
this time
an
investigation
extraction that could be located within the Warren
identify
future demands
capacity
supply capacity
It is recommended that the District commission
potential
combined
in the Warren
of additional
capacities eight
within the basin is unknown
meet
is about
To meet all of the future demand in this
new
DWD would need I
average
Valley
to
area
2 is estimated to be 11 mgd
mgd Consequently
new
As
primary source of supply it will need to indicated previously the Ames Valley Settlement its
as
in that basin
pumping
the District will need to construct
2 6
groundwater
out in the Ames build Means
at
maximum
to
to
determine the maximum
Valley and Ames Valley basins
and
locations for future wells
Construct Treatment Facilities The District has MAP
access
to 7 83 cubic
Instead of recharging
l feet per second cfs or S mgd of SWP capacity in the the groundwater basin with SWP water the District could construct
plant to allow direct delivery of SWP water to its customers It is anticipated that such a facility would be used primarily during the summer months to meet peak water demands Under this option the District might treat and deliver 5 mgd of SWP water far 4 6 months This could provide 1 870 to 2 800 acre ftlyr of treated water Delivery of SWP water would still be required for groundwater replenishment during the winter months At the current a
water treatment
SWP
allocation 1 482 to 2 412 acre ftlyr
recharge This
option
would
of SWP
water
would remain available for
groundwater
under full SWP deliveries
could increase the
increase the District s available
not
meeting MDD conditions However it supplies In fact it would divert water from
peak supply capacity water
for
to direct
uldwater recharge gro condition In addition vulnerable
delivery and may leave the groundwater basin in a deficit reliance on surface water treatment would make the District more
supply shortages during droughts when SWP deliveries are reduced Since a water treatment plant may not be operated continuously the unit cost of treatment is expected to be higher than if operated continuously Consequently this option does not appear to be viable at this point in the absence of additional water supplies to
Temporary Some water
MWH
areas
Water
Supplies
in California have
agencies Generally
water
these
supplies that are temporarily available for purchase by other supplies are surface water that would otherwise be lost if
water
Page
17 4
Section 4 Water Resources and
not
used To utilize these
yinfrastructure deliver
or
temporary
be in
a
water
position
to
supplies do
the
a water
Supply
purchasing agency
Assessment
must have
sufficient
exchange
Pez interruptible water is available from the SWP The cost of this water is typically iodically effective water source provided it can be the cost of pumping on the SWP making it acost utilized HDWD could establish an agreement with MWA to purchase interruptible water and convey the water to the District
through
the MBP
Water Conservation Measures
Water conservation is
demand
through
important
an
efficient
use
element of
will continue
water
supply management
be essential
Reduction in
water
the District grows Currently water to other desert areas because of minimal
to
as
usage in the District is relatively low compared irrigation It is expected that this trend will continue in the future
As part of its 2004 Regional Water Management Plan MWA has planned on a 10 percent water conservation level Given the District s current low water usage it is unclear whether an additional 10 percent reduction is
However 25 acre 1 yr ft
out by about this level of conservation could reduce future demands at build
he I istrict has
active
feasible
prohibitions
an
and
conservation program that includes public education water use of water conserving fixtures The District has an active public education
use
water
program that provides information on a greywater native plant landscaping leak The District has
adopted
water waste
variety of topics including water conservation detection cross connections and septic tanks to
prohibitions
reduce
water
use
of
wastage HDWD 2006b
These include
Washing
of sidewalks
driveways with a hose is prohibited clean fill operate or maintain levels in decorative fountains
walkways
Water shaIl not be used to
and
unless such water is part of a recycling system Potable
water
application
to
from
within the District shall
not
be used
the District
commercial washing of privately owned vehicles is Non hose No
equipped of
use
participate with the informed
charge In 1
with
water
adjacent lands Customers
permitted only
from
flooding
or
off onto run
hardscape driveways
on
reading
their
water meters
and
checking Program By making representative at their home
in the District s Household Water Awareness customers
can
meet with
a
on
the District
bucket and
a
automatic shut offnozzle
assistance
wanting
District
a
streets
into gutters shall be permitted
or
adopted
flow toilets and other
MWH
an
that results in
ways to conserve water save money for this service HDWD 2006b
X90
maintain dirt roads without
to
a
resolution that
water devices saving
on
their
requires
such
as
water
that all
bill
new
and much
for leaks may an
appointment
Customers
more
There is
are no
homes be installed with low
flow showerheads and flow restrictors low
on
18 Page 4
Section 4 Water Resources and
sulks
Additionally
the
The District has also
Assessment
upon the transfer of ownership of property and tenant requests water service HDWD 2006b
same
property whenever a new
Supply
applies
adopted
water
hours
to
reduce
water
wastage during the hot
on
rental
summer
During the high use season beginning June 1 and ending September 30 of each year 00 00 a m and after the hours of 5 irrigating and watering is permitted before the hours of 9 low season beginning October l and m or no more than three days per week During the use p at is the discretion of the customer taking into ending May 31 of each year watering permitted account weather conditions such as wind and temperature However watering is only permitted three days of the week HDWD 2006b months
12ecycled
Water
currently generate recycled watei as the However to reduce the nitrate contamination
Ize District does Z
not
entire District is
on
individual
groundwater basin the to install sewers and construct a wastewater treatment facility onstruction of a wastewater treatment facility will likely be a condition for future development C due to Regional Board policies Upon project completion recycled water will be available for uses such as groundwater recharge landscape irrigation etc HDWD 2006a If the District line is 2009 The rn with the design of the project this year the earliest it would be on c nenced District has estimated that about 1 000 to 1 600 acre ftlyr could be recovered through recycling water It is atlticipated that any recycled generated would offset a portion of the existing percolation of septic effluent occurring in the basin Consequently no additional water supply would be generated by recycled water However the reduction in nitrate loading to the basin would be a major benefit septic systems District has preliminary plans
in the
Growth Limitations Court overseeing the Warren
judgment approved a The court proposal to revise the method for allocating water meters approved method establishes a direct relationship between groundwater reserves and actual growth Groundwater reserves are based on the amount of water recharged in the Warren Valley Basin This method water reserves in the groundwater basin reach apre removes all restrictions on unless growth 04 deten7ainedlevel In response to this court approved proposal HDWD adopted Polley Na 26 titled Issuing Will Serve Commitment Letters and the Installation of New Water Services and Rescinding Policy 23 03 A copy of this policy in included in Appendix F This policy provides for a staged method for approving growth In December
2003
the
Superior
Valley
Basin
growth limitation would be implemented in the event water reserves in the Warren Valley Basin are equal to or fall below 5 years 500 percent of water demand for that particular year A 1 percent growth limitation would be implemented in the event Stage 2 Condition water reserves in the Warren Valley Basin are equal to or fall below 4 years 400 percent of water demand for that particular year Stage 3 Condition A 0 percent growth rate would be implemented in the event water reserves in the Warren Valley Basin are equal to or fall below 3 years 300 percent of water demand for that particular year Stage
MWH
1 Condition
A 2
percent
19 Page 4
Section 4 Water Resources and
The effect of this ent ctu
and
dry period
policy
to
maintain minimum
groundwater
reserves
that
are
to meet
adequate
years without causing overdraft Should an extended that draws down the reserves below the established levels limitations on demands
approved occur
is
Assessment
Supply
during dry
To growth would be implemented I changes to this policy are anticipated earlier this policy would limit growth if adequate water supply reserves are not
of additional
approval
As discussed maintained
Desalinated Water Yucca
it
is
is
Valley
not
100 miles away from the nearest ocean water supply Therefore that desalinated water will become a viable source in the near future
approximately
anticipated
Because of the
distance constructing
a
transmission
pipeline
would
be feasible due
not
to
the
Since MWA manages the through potential MBP that provides SWP water to the Yucca Valley there may be opportunity to increase SWP supplies by developing desalination facilities with other coastal SWP contractors thus creating alternative could exist
A
extreme cost
exchange opportunities
Summary
of Supply
currently evaluating
to
acquire up
to
500 acre 5 ftlyr
The District should be able
demands
this concept
HDWD 2006a
Options
The District will need out
MWA is
the MWA
to
of additional water
obtain additional
water
supplies
to meet
build
from the Ames Means
in that area but the long term yield of the basin is uncertain at Valley growth this time if this basin becomes overdrafted a replenishment program may become necessary The amount of replenishment water would need to be evaluated but for planning purposes it is Basin
as
expected that an supply needs
occurs
800 average of 2
Since the Warren increased
water
Valley
yr may ft acre
Basin is
fully
from the SWP is the most
be required
utilized and
likely
This
dependent
source
for
new
water
on
is included in the total
imported
water
water
If HDWD
can
recharge negotiate
extension of the MBP agreement and obtain a commitment for additional water from MWA it 600 acre ftlyr of additional supply A portion of the supply needs maybe able to obtain at least 1 Buz
could be
ftlyr
generated through
increased water conservation with the
ol demand reduction Absent of the need for may
If the District
demands
replenishment
Additional
provide adequate supply purchases pre purchase of SWP supplies
measures
cannot
Yucca
maintain
Valley
an
will need
to
water
water
limit its future
for about 2 1 50 acre two these Valley
in the Ames
could be obtained
from MWA and
adequate
potential
supply
through through conjunctive use
SWP Table
when needed to meet the
growth pursuant to Policy No
growing
04 26
UATION OF WATER QUALITY A EXISTtNG AND FUTURE REGULATIONS AND E his section discusses federal and I the
existing supplies
MWH
state
and evaluates the
quality regulations evaluates the water quality water system s adherence to waterworks standards water
Page
of
20 4
Section 4 Water Resources and
Water
Supply Assessment
Quality Regulations
T11is subsection discusses that the District
existing
water
quality laws existing regulations
and future
regulations
must meet
Laws
hc Federal Safe 1
Drinking
Water Act
Public Law
SDWA
339 originally 99
enacted in 1974
gave the federal government through the United States Environmental Protection Agency FPA the authority to set standards for drinking water quality in water delivered by public watcr
suppliers
In 1986 and
The California Safe
through
5The 4037
California
drinking
Drinking primacy
hPA
has
least
at
established
to
the SDWA
Safety Code Sections 4010 Department of Health Services DHS alifarnia Code of Regulations Title 22 C
agency for California is the
as
new
contained in
are
Sections 64400
through 17 water regulations must be
amendments
Water Act is contained in Health and
regulations
water
haptcrs 15 C
The
1996 Congress passed major
primacy state California drinking can be more stringent than federal regulations
64690
through
stringent but
As
contaminant
maximum
a
levels
and
MCLs
monitoring
egz for many additional contaminants pursuant to the Federal Safe Drinking Water Act i iircments Amendments of 1986 and 1996 As the primacy agency in Califonlia the DIIS has adapted more stringent standards for a number of inorganic compounds IOCs volatile organic compounds VOCs
and
Cs synthetic organic compounds S
Existing Regulations The MCLs for
inorganic
summarized in Table 4 9
chemicals
secondary levels The primary MCLs secondary MCLs are aesthetic standards The
most
important regulations
luoridation In h or more
1993
forth
set
by
As shown in this must
for the District
California
passed
service connections that does
a
not
table
be
are
law have
the EPA and the state
met
MCLs to
are
deem
separated
water as
of California into
safe
are
primary
and
drink
The
to
discussed below
requiring a
any
public
water
fluoridation system
to
system with 10 000
install
a
fluoridation
system if DIES identifies a source of sufficient funds to cover capital and associated casts necessary to install such a system Lnstallation should be completed within two years of the date that funds are received by the water system The optimal fluoride level should be 0 7 mg 1 6 L but 2 0
mglL is the MGL
The District very
scaon
currently has 9 352 active connections so it will need to install a fluoridation system Only Well lOW has naturally occurring high fluoride concentrations and does not
need additional fluoridation
Stage
1
Disinfection Disinfectants
DisinfectantfDisinfeetion
Product By
Rule
The EPA
published
the
Stage
1
Product D By DBP Rule in December 1998 This rule established 080 mg TTHM at 0 L halaacetic acids HAAs or HAAS at
MCLs for total trihalomethanes
MWH
21 Page 4
Section 4 Water Resources and
Supply
Assessment
mg established Maximum Residual L 8 4 mg 4 mg Disinfectant Levels for chlorine L and chlorine dioxide at 0 L chloramines the mgll within the distribution system and established enhanced coagulation requirements for As of water conventional treatment reduction of DBP precursors for surface systems using ebruary 2006 DHS has not yet adopted the Stage 1 DBP Regulation but issued draft 1 regulations in March 2005 However compliance with the federal regulation is still required ompliance requires monitoring for TTHMs and HAASs from a minimum of one sample per C quarter per treatment plant collected at a location representing the maximum residence time 060 0
L mg
bromate at 0 010
L mg
O and chlorite at 1
at
uFithin the distribution system
at
DNS 2003
already initiated quarterly TH1VI monitoring in May 1994 and completed it in May approval from DHS in September 1995 the District reduced the monitoring to The District two samples per year far THM potential beginning with sampling in May 199 with the total TIdM MCL of 100 g1L in all sampling rounds However the District complied will need to do quarterly monitoring again because of the new rule HDWD 2005e The District had
995 After 1
Interim Enhanced Surface Water Treatment Ruie In December the final Interim Enhanced Surface Water Treatment Rule IESWTR
systems utilizing surface
serving
more
requirements for surface
than
water or
000 people 10
this rule established
water
groundwater
the EPA
1998
The IESWTR
under the direct influence of surface
published applies to water
and
compliance starting in January 2002 Among other a requirement to achieve a log reduction in Cryptosporidium 2 with
systems that filter
It also lowered the
standards from 0 5
existing turbidity
nephelometric turbidity units NTU in 95 percent of the monthly measurements not to exceed 5 0 NTU in 95 percent of the monthly measurements not to exceed 1 NTU DHS NTLT to 3 prepared
draft
regulations to implement
The District is affected
people
MWH
by
this
the IESWTR in March 2003 that
requirement
because it receives SWP
are
in review
water
and served
300 21
in 2005
Page
22 4
Section 4 Water F esources and
Supply Assessment
Table 4 9 Maximum Contaminant Levels for
Inorganic
EPA
EPA
Chemicals
State
State
Primary
MCLt2
Secondary txl MCL
1
2 0
Chemical
Units
Aluminum
L mg
CCL
Antimony
mglL
006 0
006 0
L mg
01 0
05 0
Primary
hi MC
Arsenic
as
Secondary l t MCt 05 to 0 0 2
of 1123 06
Barium
L mg
2
1
Beryllium
004 0
mgiL
004 0
Boron
L mg
CGL
Cadmium
mglL
005 0
Chlaride
250
mg1L
Chromium
Total Cr
Chromium
Total
Cr VI
L mg Screen
005 0
1 0
600 500 25p 05 0
L mg
Gopper
L mg
3 1
1
3 1
Fluoride
mglL
4
2
2
Iron
L mg
Lead
L mg
Manganese
L mg
Mercury
L mg
Niekel
L mg
Nitrate as NOs
L mg
Perchlorate
3 0 015 0
1
3 0 015 0
05 0 002 0
05 0 002 0 1 0 45
L pg
CCL
Selenium
mglL
05 0
Silver
L mg
Sulfate
L mg
6
NL
05 0 1 0
1 0 250
600 500 250
Thallium
L mg
002 0
002 0
Vanadium
L mg
CCL
inc
L mg
5
5
Ccalar Apparent
units
15
15
Odor Threshold
TON
3
3 5 0
MBAS
L mg
5 0
pN
units
8 5 6
Speaific
Conductance
2200 1600 900
cm pS
Total Dissolved Solids
L mg
Turbidity
NTU
500
1500 1000 500 5
1 EPA 2003 2 DNS 2004 3 Values shown
term limits for the indicated constituent Water less than the upper limit are the recommended upper and short term limit may only be acceptable if it is not reasonable or feasible to provide more suitable water Water up to the short served on a temporary basis pending treatment or development of acceptable new supplies Lead and copper action levels are exceeded if more than 10 percent of the samples exceed the values indicated is
4 5
GGL indicates the contaminant is
MWH
on
the Contaminant Candidate List
Page
23 4
Section 4 Water Resources and
Nitrate and Nitrite
Nitrates
organic
combitle with various
converted into nitrites
and
and nitrites
NOz inorganic compounds
3 NC
Infants less than six months old
Supply
Assessment
nitrogen compounds that oxygen Once taken into the body nitrates are who drink water containing nitrate in are
seriously ill and if untreated may die Health affects include of breath and blue baby syndrome Both the EPA and DHS established the MCL far 10 mglL 5 mg N at 1 mg L as N03 and for NOz L
of the MCL could become
excess
shortness
ls at NOS Several
groundwater
wells in the District
are
affected
of nitrates in the District is
by high nitrate
tank effluent
concentratians The
Monitoring
primary required
for nitrate is
septic halfthe nitrate annually increasing to quarterly for sources which exceed one Monitoring for nitrite is required every three years increasing to quarterly far ce sour
MCL of 45 those
L mg that
sources
exceed one halfthe nitrite MCL
Arsenic Arsenic is surface
water
naturally occurring inorganic
a
and is considered
supplies
MCL from 0 005 mgfL
to 0 01
L mg
in
a
contaminant found in
known human
January
carcinogen
some
groundwater and
The EPA lowered the
2001 The effective date for the arsenic rule
was
compliance date for the regulation was January 23 2006 All surface systems complete initial monitoring by December 31 2006 while groundwater must complete initial systems monitoring by December 3l 2007 2002 and the
February 22 water
must
This may be a concern for the District since some wells have experienced concentrations as 17 2000 HDWD 2005a HDWD 2005b b between 2004 pp
Stage
Z DBP Rule
includes the
1
The EPA
published following requirements
he EPA finalized the 1
ently cancun
with the
Long
Stage
the
Stage
2 DBP Rule
on
January 4
2006
as
high
The rule
Term 2 Enhanced Surface Water Treatment Rule LT2ESWTR
2 DBPR
to ensure
simultaneous
protection
from microbial and
DI3P risks 2
IDSE must be conducted for systems serving 000 people 10 study to identify and select future monitoring sites representing high TTHM and HAAS levels in the distribution system If all samples far 040 mg 030 mg Stage 1 DBP Rule monitoring are less than 0 L for THM and 0 L for HAAS no further 000 and 50 000 monitoring is required Agencies with populations between 10 need to submit an IDSE plan by October 1 2007 IDSE reports must be submitted to DHS An Initial Distribution more
3
4
Evaluation
Atl IDSE is
Systems serving an
System
than
a
between 10 000 and
the IDSE and the
50 people will need to complete and submit reports 000 Cryptosporidium monitoring to DHS by December 31 2009
The IDSE includes recommendations far
new
DBP
compliance
locations and the months in
monitoring Compliance with the Stage 2 DBP Rule DBPR will be determined using a Locational Rurn ing Annual Average LRAA instead of a distribution wide running annual average Groundwater systems serving more than system 000 people will monitor quarterly at the highest THM location and the highest HAAS 10 which TTHM and HAAS
should
location The bromate MCL will remain of a
year review six
should be
MWN
to
at
occur
OlO O
L mg
The MCL will be reviewed
determine whether the MCL should stay
at
010 mg 0 L
or
as
part
whether it
lowered
Page
24 4
Section 4 Water Resources and
5
Supply
Assessment
within three years of the final rule being published systems will have to comply with Stage 10 mglL far HAAS using the LRAA approach but 2A MGLs of 0 120 mglL for THMs and 0 e not the new locations as will be using the Stage 1 DBP Rule sample locations i
compliance with the Stage 1 Ms and 0 060 mg Ls of 0 MC 080 mglL for TI L for HAAS with compliance based on the distribution system annual year extensions far capital projects wide running average Two will be available Within six years of the final rule systems will need to be in campliance 080 mg1L for THMs and 0 060 mg with the Stage 2B 1VICLs of 0 L for HAAS using the new sample locations identified per the IDSE and using the LRAA for compliance determination Two year extensions for capital projects will be available determined
by
the
IDSE
as
well
as
continue
demonstrate
to
monitoring no conclusions can be made regarding the IDSE at this time The Stage 2 DBP Rule will require the District to The monitor DBPs in its distribution system at locations having high DBP concentrations change to a LRAA may result in compliance issues however the extent is unknown at this time Because MWH
Future
was
provided with
not
the results of Stage 1 DBP
Regulations
regulations are under development at the federal and state levels that could affect water utilities using groundwater to augment their supplies Six pending regulations that could affect the District s local groundwater supplies are arsenic chromium 6 radon sulfate the grotiuidwater treatment rule and the Stage 2 DBP Rule Several
ia Health Although a new federal MCL for arsenic has been established the Califos to a new arsenic MCL Code Section 1 1 6361 DHS required by June 30 2004 Safety adopt
Arsenic and
HS I
was
unable to
Health Goal
meet
the June 2004
for arsenic
In
requirement April 2004 the
because
at
that time there
was z1o
Public
Office of Environmental Health Hazard
PHG 004 g L based on risks associated with QEHHA established the arsenic PHG at 0 cancers of the lung and bladder DHS is now proceeding with the MCL process for arsenic and as of March 2006 anticipates proposing a new MCL for arsenic by the end of 2006 This new Assessment
MCL could be the for
blending
same or
lower than the federal MCL A lower MCL could result in the need
or treatment
Chromium 6 Hexavalent chromium
chromium 6
when
the evidence for its
however
carcinogenicity drinking water by a total
chromium 6 in
regulates
both chromium 6 and
a
is known
to cause cancer
ingested
is
not
when it is
compelling
inhaled
California
chromium MCL Total chromium consists of
metal trivalent chromium chromium 3 The 1 L the federal MCL for total chromium is 0 mg total chromium of 0 0025 mg L in February 1999 In
toxic form of the less
alifol MCL for total chromium is 0 C nia 05
The OEHHA adopted a PHCs for November 2001 OEHHA withdrew its PHG for total chromium in drinking water C9EHHA is developing a new chromium 6 PIIG that will replace the withdrawn PHG for total chromium
L mg
DHS will state
The the
law
new
use
the
As of March
to
2006
there is
develop
to
no
a
drinking water standard as required by adopting the new PHG or the MCL
chromium 6
schedule for
have little effect
the District s
regulations
are
expected
has
not
exceeded 0 016 mg L total chromium
groundwater
WH y
PHG
new
on
water
system operations as IIDWD 2005b 2005a HDWD
25 Page 4
Section 4 Water Resources and
Ftadlonuelides
DHS issued
a
notice of
proposed rulemaking
to
Supply
Assessment
adopt updated drinking
water
far radionuclides
radium radium 226 228 gross alpha particle activity uranium and 90 tritium This proposed regulation would incorporate all betaJphotan emitters strontium of the federal regulations except for uranium which will be kept at the more stringent state MCL regulations
of 20 dune 1 The
per liter pCi L The comment period on the proposed regulations closed 2005 These regulations could be approved in the first half of2006
picocuries
s water system operations as regulations are expected to have little effect on the District not and some of the change monitoring requirements may be reduced
on
the
numerical limits will
Radon
Radon is
decay product in certain rack formations Under the 1996 amendments to the SDWA the EPA published far public comment a health risk reduction and cost analysis for a potential radon standard on February S 1999 The EPA was required to propose a radon regulation in August 1999 and to publish a final regulation in August 2000 On November 2 1999 the EPA published for public comment a proposed L of 300 pCilL far groundwater systems serving 10 MC 000 or more people However the 1996 A amendments require the EPA to establish an alternate 1V1CL AMCL far radon if the SDt a
naturally occurring
contribution of radon from air phis AMCL is
proposed
A Final Radon Rule
2001 and had into ofEce
water to
was
to
be
sent to
gas that is
a
radioactive
radon in indoor air is less than
w nc
the Office of
Management and Budget OMB on January 19 review by the time the new Bush Administration came
gone through the OMB The Radon Rule has been sent back not
rule will have little effect
Groundwater Rule The EPA is
levels in outdoor
000 pCi 4 L
to
the EPA for review
completed it will go back to the OMB far their review radon MCL is uncertain as of March 2006 The
background
on
the District s
developing pathogens
from bacterial and viral
a
water
After that review is
The schedule for
system
groundwater
promulgation
of
operations
rule
GWR
to assure
fecal contamination indicators in
public health groundwater
protection The proposed GWR will specify appropriate use of disinfection and encourage the use altenlative approaches including management practices and control of contamination at or
a
of its
source
May 10 2000 EPA published the proposed GWR The public comment period closed on August 9 2000 In January 2005 EPA sent the final GVVR to the OMB fora 90 day review In March 2005 EPA voluntarily withdrew the rule based on issues raised by the OMB and anticipates promulgating the final GWR in August 2006 n C
The District
1 S samples per week from the distribution system All wells in routinely collects 12 operation sampled monthly far bacteriological quality The bacteriological monitoring program collects representative samples throughout the distribution system and complies with currant regulations are
MWH
26 Page 4
Section 4 Water Resources and
Total Goliform Rule
The EPA
The Z CR
public
all
requires
published
water
the Total Coliform Rule
systems
monitor
to
distribution systems as measured by total coliforms Drinking Water Act require the EPA to review and revise
strategies
assess
public health protection developed a series of white
as
appropriate h1 July 2003
data information
Tune
29 199
to
as
its decision
the Safe
phimary
part of its National to
revise the TCR current
additional alternative
maintaining
system experts
in their
each national
the effectiveness of the
supportable
The EPA and distribution
on
the presence of coliforms
available that would decrease economic burden while
are
TCR
The 1996 amendments
drinking water regulation not less often than every six years Primary Drinking Water Regulation Review the EPA published As part of the TCR rulemaking the EPA plans to reducing public health risk and what technically
Supply Assessment
or
TCR in
monitoring improving
external to EPA have
The
papers objective of the white papers is to review the available and research regarding the potential public health risks assaciated with the
distribution system issues and where relevant identify areas in which additional research may be warranted In addition the EPA and AWWA are preparing a series of ten TCR issue papers
presenting
available information related to
the papers
as
sources
for
for discussions
potential on
TCR revision
The EPA will
TCR issues with the
drinking
use
water
experts and stakeholders
unity coznn Water
information
topics
Quality
11is subsection describes the T
quality monitoring requirements
water
s wells It also discusses the District
specific
and
compliance
of the
exceedances of the California MCLs
Monitoring bacteria minerals inorganics volatile products The following organics synthetic organics unregulated chemicals and disinfection by Annual information is summarized from the DHS 2003 monitoring Inspection Report and The District
regularly
IIDWD Well Water
monitors its
water
Quality Data from
quality
far
2005 1992
According to DHS vulnerability assessment letter dated December 26 2001 the District is required to monitor all active wells for general mineral general physical and inorganic chemicals every three years The District is up date on all chemical monitoring to
Monitoring
for
radiological
Since Wells 6W
and 14E
9W
required for four consecutive quarters every four years relatively new they have not yet been monitored for four
chemicals is are
consecutive quarters
vulnerability assessment letter regulated VOCs are required to be monitored every The District is up date on all VOC monitoring except for Wells 3W 9W and 12E to
Per DHS years
Per the DHS MTBE
vulnerability
have each been classified
as
assessment
either vulnerable
letter dated or
August 23 2001
vulnerable non
to MTBE
six
the District s wells To
complete
the
monitoring requirements for MTBE all wells must be sampled for four consecutive quarters and then annually for two years Following completion of the initial MTBE monitoring initial
requirements MTBE monitoring waiver to
MWH
The District may apply for a will be monitored every three years reduce the monitoring frequency to once every six years for those wells
Page
27 4
Section 4 Water Resources and
designated 2W 12E
as
vulnerable non
to
The District needs
MTBE
to
Supply Assessment
complete monitoring
far Wells
and 17E
year Monitoring of representative water sources for SOCs is due every three years A three is detect non Waivers will not be given waiver be for if SOC may sampling monitoring applied EDB All Wells l0E and 24E have not been for DBC and simazine monitoring wells except P monitored far any SOCs
Monitoring
for
chemicals is
unregulated
required
from each well for
two
sampling rounds
five
months apart At least one sample must be collected during the vulnerable time period betweetl May 1 and September 30 Monitoring for two rounds for all wells except Wells 7E and to seven
IOW leas been
completed
The District collects four
water
for
color odor
sampling comply
The results of this
system system
samples
and
turbidity per week from the secondary standards
with
the distribution for distribution
quality month lead and copper monitoring two rounds of completed two rounds of six two rounds of reduced triennial monitoring The 90 percentile monitoring and
The District has reduced annual
lead and capper levels were below their respective action levels in all sampling rounds according The District was due again far lead and copper to the 2003 Annual Inspection Report
monitoring
in
summer
2005
but this has
not
been completed
as
of February 2006
Maximum Contaminant Level Exceedances
The
primary
water
quality
contaminants of concern
are
concern
for the
s District
arsenic fluoride iron
and
groundwater turbidity
wells is nitrate
Other
water source is most vulnerable to nitrate contamination from septic systems in the Nitrate exceedances occurred in Wells 12E and 17E between 2000 2003 while fluoride
The District s area
exceedances occurred in Well lOW between 2003 2004 The
specific
exceedances
listed in
are
Table 4 10 and Table 4 11
C o nsequently in excess
to
2002
the District installed
nitrates from Wells 12E and 17E
eliminate the need for
2005b nitrate is
June
septic
an
ion
exchange
A wastewater treatment
tanks in the
more
treatment
facility
be built
plant will eventually
densely populated areas
of the District
HDWD
IS 2003 Wells 12E and 17E DI is blended with Well 16E water which is law in and discharged to the distribution system via pipelines to the three well sites The plant water
consistently below 20 mglL nitrate and not exceeding and blended water below 30 mg L nitrate DHS 2003 The use of Well 5W ontinued because it contains high nitrates that cannot be cost dist effectively treated capable
of
producing
exchange plant
MWH
to remove
water
Well lOW
water
is blended with well
to
lower its
high
36
L mg
has been at
the ion
fluoride concentration
Page
28 4
Section 4 Water Resources and
Supply Assessment
10 Table 4 Nitrate MCA
45 mg Specific Exceedances
Well ID
12E
Sam
le Date
03102 07
51
02 24 04
50
02 23 01
53
01 10129
53
00 17 07
L
52 5 50
03 16 07
45
03 12 02
50
01 22 03
53
02 20 06
54
02 23 01
56
01 10 07
52
01 02 07
52
16101 01
MWH
m
45
01 05 02
17E
Nitrate
03 15 01
2005 1992
54
12 1100
0 58
00 17 07
4 58
99 12 07
7 66
98 20 07
6 66
01 19 98
0 45
Page
29 4
Section 4 Water Resources and
Supply
Assessment
Table 4 11 Fluoride MCL
2005 2 mg Specific Exceedances 1992
Well ID
Sam
10W
Table 4 12
2004
as
Fluoride
m
0 2
03 19 02
3 2
03 02
2
99 14 04
69 2
summary of the contaminants that exceeded the MCL between 1992 and in Consumer Confidence Reports from 199 2004 and Water Quality Reports
presents
reported
le Date
01 14 04
a
from 1992 1997
12 Table 4 Contaminants
the MCL Between 1992 2004
Exceeding
Contaminant
Year
Arsenic
2004
District Ran
2003
050 0 050 0
050 0
012 0 05
050 0
1993
012 0 05
050 0
2000
244 0 9 2 9
1999
254 0 6 2 8
1997
17 0 7 2 9
2 2 2 4 1
790 0
3 0 3 0
167 3 0 00
1996
71 1 0
3 0
2003
51 5 8
45
2000
65 5 2 1
45
1999
82 0 5 2
45
1998
81 0 2 3
45
1997
95 6 4 2
45
1996
7 5 1 0
5 NTU
1992
6 1 0
5 NTU 0
2000
9 4 7
Radon 222
1992
1003 525
1000
Total Dissolved Solids
2002
750 120
500
Uranium
1996
24 3
20
Vanadium
2004
58 0
50
H
L was lowered from 5U ppb to 1U ppb 1 Arsenic MC
Results are taken 2
at the well
prior to
treatment
on
8 5 6
January i uuEi
This
high
nitrate water
was
he most recent measured nitrate and fluoride concentrations
ortunately
MWH
m
1994
2000
Turbidity
MCL
050 0
017 0
2002
Nitrate
L
017 0 ND
1997
Iron
m
0 0 0 112 02
2000
Fluoride
e
013 0
none
ofthem exceeds their
respective
not directly served to customers
are
presented
in Table 4 13
MCLs
Page
30 4
Section 4 Water Resources and
Supply
Assessment
13 Table 4 Current Nitrate and Fluoride Concentrations Well ID
Sam
le Date
Nitrate
L
m
Fluoride
m
2W
05 19 01
18
ND
5E
10 05 26
40
ND
05 10 08
20
ND
8W
10 05
11
ND
9W
05 13 04
14
10W
10 05
2 8
ND
11 W
04 07
11
ND
12E
05 29 06
30
ND
14E
05 13 07
16
ND
16E
05 29 06
21
ND
17E
05 15 06
37
ND
18E
10 05
11
24E
10 05
8 5
6W
L
33 0
ND 69 0
Note ND non detectable
Waterworks Standards Based
the latest DHS Annual
on
complies
with the
Inspection Report from 2003 standards established by the California
current
the
existing
water
system
Waterworks Standard and
American Water Works Association
The District s
source
improvements comply
distribution
capacity storage capacity
facility construction
with the California Waterworks Standard
The
water
and system
main disinfection
complies with AWWA standards Per DHS requirements the water is chlorinated after pumped from the wells HDWD 20OSb The design of the ion exchange treatment plant and the installed reliability features have adequate redundancies to prevent water exceeding the nitrate MCL from being delivered to the public program
it is
All wells have surface and
sanitary seals except
for Wells 2W and
sanitary seals Currently Well 3W is inactive Well 2W probably be removed from service with little impact if its
3W which do not have is aloes producing well that could water cannot meet drinking water
standards
FINDINGS AND RECOMMENDATIONS The District s current
water
supplies are adequate to of development provided
about the 50 percent level Basin as allowed in the Settlement
Agreement
At
meet current and
projected
demands until
pump water from the Ames Valley out the District will require at least build it
can
yr under ft 600 acre acre of additional supplies and could require as much as 5 yr ft s well production capacity is adequate to meet MDD average hydrology conditions The District until about the 33 percent development level 90C 2
To meet build out conditions it will need to which 4
MWH
mgd
should be in the Ames
develop nearly 13 mgd of new well capacity of Valley Basin with the remainder in the Warren Valley
31 Page 4
Section 4 Water Resources and
Basin
It is
maximum
recommended that the District commission
potential
s and to il Bas
locations for future wells
The District should continue discussions with MWA
supplies including
the
acquisition
available for storage in the Warren
to
obtain
along caznmitment term
of additional SWP Table A water
work with MWA to obtain additional SWP water
MWH
investigation to determine the Warren Valley and Ames Valley
an
extraction that could be located within the
identify
Supply Assessment
Valley Basin
either
for future
Table A
or
for SWP
The District also should
interruptible water
when
use
32 Page 4
Section 4 Water Resources and
Supply
Assessment
REFERENCES
alifoz Department of health Services C lia ater District Yl
2003 Annual Inspccti Desert nReport fo Hi
DHS
2004
May 2003
alifonlia Department of Health Services C related Laws and
Califortzia
DHS
Regulations
Department
Title
22
Division
California Safe Drinking
4 Chapter
of Water Resources
I1 3 Individual Basin
DWR 2004 s alifornia Groundwater C Descriptions February 27 2004
FDA 2003 National Primary
Drinking
Water
2005 Annual Reportt of the Warren
f7ctubcr 1 2004
through September
Desert Water District Hi
HDWD
Available
2005b
Accessed
HDWD
2005c
HDWD
2005d
www Accessed htm supple eom hdwd Ii Water District I Desert
HDWD
2005e
Watermasterfor the Period
2005
Quality Reports
January 3
Available
2006
Monthly
Accessed
Board
Report
Water stats com hdwd www http pdf Culyr
Desert Water District 1Ii
2006 E mail
1999 2005 Consumer Confidence
htm waterquality com hdwd www http
esert Water District I Hi Available
HDWD
21
199 Water 1993
lwww hula water com hdwd quality htm Desert Water District Hi
Valley Basin
30 5 2Q December
2005a
Bulletin
June 2003
Standards
CJrady Pat Hi Desert Water District Information Systems Manager correspondence January 19 2006 lanso James C I n
Water Act and
I5 June 2004
Recharge
Reports January 3 2006
for Fiscal Year 2004 05
Accessed
January 24
2006
Water Available
December
22
2005
Watermaster Available
htm Accessed December 20 2005 watermaster com hdwd www Desert Water District Hi
HDWD
2005f Well Water
Desert Water District Hi
HDWD
2006a 2005 Urban Water Management Plan
Desert Water District Hi
HDWD
2006b Water conservation programs and ordinances
Quality Data from
2005 1992
www httpJhttp htzn gencon com hdwd htm handouts com hdwd www htmAccessed ordinanees com hdwd www http John
Egan
and
Associates
March 20 2006
2001 Hi Desert Water Distr ict Water Master Plan
Update
Lecember 2001
MWH
Page
33 4
Section 4 Water Resources and
199 L
a KJC Chilto KennedylJenks rt January 30 Rc
Mojave
Warren
Supply
Halley Basin Management Plan
Assessment
Fznal Draft
1991
Desert Water District I tDWD 1991 Agreement MWA and the Ni Construction Operation and Financing of the 1Vlorongo Basin Pipeline Project
Water Agency
for the
March 1 S 1991
Superior
Desert Water District Hi in Judgement a
MWH
C a unty of San Bernardino 1977 Judgement Company Ltd Case 1Vo 1721 3 Warren Valley
Court of the State of California far the vs
Yucca Water
77 September 16 19
34 Page 4
