Caged Clam Study
Caged Clam Study Plant Reaches, 2004 Thomas R. Benzing, JMU Doug Graber-Neufeld, EMU November 9, 2004
Plant reaches and cage locations
Waynesboro
Dupont plant site
Clams taken from North River
Collecting clams
Sorting clams by size
Caging and Canoeing Clams
Placing Clam Cage May 21-22, 2004
Recording Location Using GPS
Clam Cages on River Bottom
Clam cage in Jones Hollow (above) Clam cage in South River (right)
Recovering Cages • • • • • •
August 28, 2004 (after 99 Days) Recovered 19 of 20 cages (95%) 80.1% of clams were alive Clams purged for 48-72 hours in JMU labs Tissue was harvested and frozen on 8/31/2004 Sent to Studio Geochimica Labs on 9/15/2004
Mercury in South River Clams near Dupont Plant Mercury in Caged Clams in South River along Plant Reach 70
50
40 total Hg methyl Hg 30
20
10
Site ID
CCA1400
CCA1300
CCA1200
CCA1100
CCA1000
CCA0900
CCA0800
CCA0600
CCA0500
CCA0400
CCA0300
CCA0200
CCA0100
0 CCA0000
Average concentration (ppb)
60
South River Reach: 0 – 600 meters
South River Reach: 300 – 900 meters
South River Reach: 800 – 1200 meters
Mercury in Jones Hollow Clams near Dupont Plant Mercury in Caged Clams in Jones Hollow along Plant Reach 70
Average concentration (ppb)
60
50
40 total Hg methyl Hg 30
20
10
0 CCJH100
CCJH200
CCJH300
Site ID
CCJH400
CCJH500
Jones Hollow Reach: 0 – 500 meters
0
methyl, South River non-methyl, South River Site ID
methyl, Jones Hollow non-methyl, Jones Hollow
CCJH500A
CCJH400A
CCJH300A
CCJH200A
CCJH100A
CCA1400A
CCA1300A
CCA1200A
CCA1100A
CCA1000A
CCA0900A
CCA0800A
CCA0600A
CCA0500A
CCA0400A
CCA0300A
CCA0200A
CCA0100A
CCA0000A
Percent of Total Hg Percent of Total Mercury
Mercury fractions in clam tissue, 2004 Mercury fractions in clam tissue, 2004
100
80
60
40
20
Still to come…. • Caged Clams: North Park to Basic Park – Placed on July 10 – Recovered on September 25 (after 77 days) – 14 of 20 cages recovered (70%)
• Caged Clams: Dooms Mill Pond – Placed on July 16 – Recovered on September 25 (after 71 days) – 18 of 20 cages recovered (90%)
JEANNE FRANCES IVAN
Sina Pricelius Stacy Davenport Lee Cochran Cheryl Heatwole Tim Shenk Absalom Shank Fred Copithorn
Thanks to…
Mark Lotts Pete Bolton Ashley Young Harrison Green Jacob Hileman Bill Van Wart Ted Turner
Sampling Location ID C S 18 C S 10 1 C S 40 1
C S 17
C S 16
C S 15
C S 14
C S 13
C S 12
C S 11
0.45
C S 10
C S 09
C S 08
C S 07
C S 06
C S 05
C S 04
C S 03
C S 02
C S 01
Hg Concentration (ppmwet weight)
Comparison of Clam Data, 2001-2003
0.60
2003 2002 2001
0.30
0.15
0.00
Clam Tissue Results, 2003 0.40
Total Hg Methyl Hg Hg Concentration (ppmwet weight)
0.30
Methyl Hg = 38% Total Hg 0.20
0.10
0.00 CS01
CS03
CS12
CS18
Sampling Site ID
CS101
CS401
Plant reaches and cage locations
Waynesboro
Dupont plant site
Clams taken from North River
Collecting clams
Sorting clams by size
Caging and Canoeing Clams
Placing Clam Cage May 21-22, 2004
Recording Location Using GPS
Clam Cages on River Bottom
Clam cage in Jones Hollow (above) Clam cage in South River (right)
Recovering Cages • • • • • •
August 28, 2004 (after 99 Days) Recovered 19 of 20 cages (95%) 80.1% of clams were alive Clams purged for 48-72 hours in JMU labs Tissue was harvested and frozen on 8/31/2004 Sent to Studio Geochimica Labs on 9/15/2004
Mercury in South River Clams near Dupont Plant Mercury in Caged Clams in South River along Plant Reach 70
50
40 total Hg methyl Hg 30
20
10
Site ID
CCA1400
CCA1300
CCA1200
CCA1100
CCA1000
CCA0900
CCA0800
CCA0600
CCA0500
CCA0400
CCA0300
CCA0200
CCA0100
0 CCA0000
Average concentration (ppb)
60
South River Reach: 0 – 600 meters
South River Reach: 300 – 900 meters
South River Reach: 800 – 1200 meters
Mercury in Jones Hollow Clams near Dupont Plant Mercury in Caged Clams in Jones Hollow along Plant Reach 70
Average concentration (ppb)
60
50
40 total Hg methyl Hg 30
20
10
0 CCJH100
CCJH200
CCJH300
Site ID
CCJH400
CCJH500
Jones Hollow Reach: 0 – 500 meters
0
methyl, South River non-methyl, South River Site ID
methyl, Jones Hollow non-methyl, Jones Hollow
CCJH500A
CCJH400A
CCJH300A
CCJH200A
CCJH100A
CCA1400A
CCA1300A
CCA1200A
CCA1100A
CCA1000A
CCA0900A
CCA0800A
CCA0600A
CCA0500A
CCA0400A
CCA0300A
CCA0200A
CCA0100A
CCA0000A
Percent of Total Hg Percent of Total Mercury
Mercury fractions in clam tissue, 2004 Mercury fractions in clam tissue, 2004
100
80
60
40
20
Still to come…. • Caged Clams: North Park to Basic Park – Placed on July 10 – Recovered on September 25 (after 77 days) – 14 of 20 cages recovered (70%)
• Caged Clams: Dooms Mill Pond – Placed on July 16 – Recovered on September 25 (after 71 days) – 18 of 20 cages recovered (90%)
JEANNE FRANCES IVAN
Sina Pricelius Stacy Davenport Lee Cochran Cheryl Heatwole Tim Shenk Absalom Shank Fred Copithorn
Thanks to…
Mark Lotts Pete Bolton Ashley Young Harrison Green Jacob Hileman Bill Van Wart Ted Turner
Sampling Location ID C S 18 C S 10 1 C S 40 1
C S 17
C S 16
C S 15
C S 14
C S 13
C S 12
C S 11
0.45
C S 10
C S 09
C S 08
C S 07
C S 06
C S 05
C S 04
C S 03
C S 02
C S 01
Hg Concentration (ppmwet weight)
Comparison of Clam Data, 2001-2003
0.60
2003 2002 2001
0.30
0.15
0.00
Clam Tissue Results, 2003 0.40
Total Hg Methyl Hg Hg Concentration (ppmwet weight)
0.30
Methyl Hg = 38% Total Hg 0.20
0.10
0.00 CS01
CS03
CS12
CS18
Sampling Site ID
CS101
CS401
