South River Mercury TMDL: Study Goals
South River Mercury TMDL Study
Jack Eggleston
South River Mercury TMDL: Study Goals
•
Characterize cycling of total mercury and methyl mercury
•
Develop mathematical models for simulating surface water flows and methyl mercury production and transport
•
Determine loading reductions needed to achieve fish tissue Hg levels of less than 0.5 ppm
South River Mercury TMDL :
Study Area
Grottoes
>!
Crimora
SOUTH RIVER AT HARRISTON, VA 01627300
Dooms
Waynesboro
>!
SOUTH RIVER NEAR WAYNESBORO VA, 01626000
Mass Balance of Total Mercury
Runoff to river Direct Atmospheric Deposition
Losses to Atmosphere
Tributary Contributions South River Sediment deposition/suspension Point Sources
Downstream Losses
Groundwater Discharge to river
Mass Balance of Methyl Mercury
Net Methylation of Hg in Water Column Tributary Contributions
Volatilization
Bioavailable Mercury (MeHg) in Water Column
Net Sedimentation of MeHg
Porewater MeHg Net Inflow
Downstream Losses
Streamflow Monitoring 2 Existing Continuous Stations Waynesboro, 01626000 1952-present
Harriston, 01627300 1925-present
1 New Periodic Station Dooms
Continuous WQ Monitoring – Proposed Locations Waynesboro Dooms
Harriston
Continuous Stream WQ Monitoring Equipment Sensors In the James River at Cartersville
Out of Water
Mercury Loading Rate – Example Calculation Hurricane Jeanne - September 28, 2004 Streamflow and Mercury Concentrations at Harriston Streamflow (cfs)
14000
8,000
Measured [Hg] (ng/l)
Streamflow (cfs)
7,000 6,000
10000
5,000 8000 4,000 6000 3,000 4000
2,000
2000 0 12:00
Total Mercury Concentration (ng/l)
Estimated [Hg] (ng/l)
12000
1,000
16:00
20:00
0:00
4:00
8:00
0 12:00
Time (Hours from noon 9/28 to noon 9/29)
Mercury Flux Thanks to Ted Turner for outstanding data collection and help.
= (Concentration x Flow) = 46 kg over 19 hours
Flow of this magnitude (6500 daily cfs) has an average recurrence interval of 4 years
Jack Eggleston
South River Mercury TMDL: Study Goals
•
Characterize cycling of total mercury and methyl mercury
•
Develop mathematical models for simulating surface water flows and methyl mercury production and transport
•
Determine loading reductions needed to achieve fish tissue Hg levels of less than 0.5 ppm
South River Mercury TMDL :
Study Area
Grottoes
>!
Crimora
SOUTH RIVER AT HARRISTON, VA 01627300
Dooms
Waynesboro
>!
SOUTH RIVER NEAR WAYNESBORO VA, 01626000
Mass Balance of Total Mercury
Runoff to river Direct Atmospheric Deposition
Losses to Atmosphere
Tributary Contributions South River Sediment deposition/suspension Point Sources
Downstream Losses
Groundwater Discharge to river
Mass Balance of Methyl Mercury
Net Methylation of Hg in Water Column Tributary Contributions
Volatilization
Bioavailable Mercury (MeHg) in Water Column
Net Sedimentation of MeHg
Porewater MeHg Net Inflow
Downstream Losses
Streamflow Monitoring 2 Existing Continuous Stations Waynesboro, 01626000 1952-present
Harriston, 01627300 1925-present
1 New Periodic Station Dooms
Continuous WQ Monitoring – Proposed Locations Waynesboro Dooms
Harriston
Continuous Stream WQ Monitoring Equipment Sensors In the James River at Cartersville
Out of Water
Mercury Loading Rate – Example Calculation Hurricane Jeanne - September 28, 2004 Streamflow and Mercury Concentrations at Harriston Streamflow (cfs)
14000
8,000
Measured [Hg] (ng/l)
Streamflow (cfs)
7,000 6,000
10000
5,000 8000 4,000 6000 3,000 4000
2,000
2000 0 12:00
Total Mercury Concentration (ng/l)
Estimated [Hg] (ng/l)
12000
1,000
16:00
20:00
0:00
4:00
8:00
0 12:00
Time (Hours from noon 9/28 to noon 9/29)
Mercury Flux Thanks to Ted Turner for outstanding data collection and help.
= (Concentration x Flow) = 46 kg over 19 hours
Flow of this magnitude (6500 daily cfs) has an average recurrence interval of 4 years
