The Sierra Fund Science Director Carrie Monohan, Ph.D.
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1 The Sierra Fund Science Director Carrie Monohan, Ph.D.
2 Mercury and the Gold Rush USGS Fact Sheet
3 Mercury and the Gold Rush Mercury was used during hardrock and hydraulic mining. It is still entrained in the river gravels. Deer Creek 1908 Greenhorn Creek 2011
4 Dust and the Gold Rush Rock crushed in mills Tons of waste rock spread over large areas Piles of rocks used for many things Construction Road surfaces Fill Dirt
5 Dust and the Gold Rush EPA officials played baseball wearing dust masks to test asbestos at an elementary school in El Dorado County and recorded significant exposure to asbestos in just one hour of play.
6
7 Gold Rush Legacy Mercury in Fish Metals in Dust
8
9 Are people eating the fish? Survey Locations Deer Creek Upper Scotts Flat Lake Lower Scotts Flat Lake Lake Wildwood Bear River Rollins Lake Lake Combie Camp Far West Reservoir South Yuba River North Yuba River Lake Englebright Lower Yuba River (below Englebright)
10 Location of Surveys Surveys Completed 69 were collected in were collected in were completed in were completed in 2012
11 Are you going to eat the fish you catch today? Don't Know 1% Are you going to feed the fish you catch to your family? Don't Know 1% No 44% Yes 55% 46% Household Consumption Information 52% No 39% Yes 60% 7% Children in household eaten sport fish in the last year Women b/w eaten sport fish in the last year Pregnant or nursing women eaten sport fish in the last year
12 Rainbow Trout Bass, any species Cat Fish Brown Trout Kokanne Salmon Crappie Sun Fish/Blue Gill Cray Fish Other Chinnok Salmon Sturgen Clams 77% Fish Consumption By Species 59% Do you EVER eat the fish that you or someone you know catches? No 19% 39% 35% 33% Yes 80% 25% 23% 23% 19% 12% 9% 8%
13 µg Methylmercury/Day Methylmercury Exposure from Sport Fish Consumption Women over 45 and Men 70 Sensitive Populations* OEHHA Recommended Safe Level for Women over 45 and Men-assume 70kg (154lbs) OEHHA Safe Level for Sensitive Populations*-assume 70 kg person and 35kg child (154lbs and 77lbs child) µg MeHg/Day 20 7µg MeHg/Day 10 0 Survey Participant
14 Angler Survey Summary and Conclusions 80% of anglers reported eating sport fish 50% feed the fish they catch to women/children 10% are consuming mercury at levels above the OEHHA safe eating guidelines Posted warnings were not present at most fishing locations Exposure potential is high with limited awareness
15 Dust and Mounds Recreation creates dust Trails go through Abandoned Mines Is there a problem? Exposure Scenarios Site Specific Risk Assessments How big is this problem?
16
17 How high is too high? Lab Detection Limits US EPA PRGs for Residential Cal EPA Industrial BLM Risk Management Criteria for Initial Screening Secondary Screening Element Symbol (ME-ICP41m) Soil CHHSLs Recreation Level Level (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) Arsenic As Chromium Cr , ,000 Lead Pb Initial Screening Level-not good Secondary Screening Level- really NOT good
18 Arsenic Lead.Asbestos.
19 Recommendation Recreational Trails Survey Quantify dust exposure and exposure to specific COCs for recreational activities in the higher risk areas identified. Dust monitoring activities by qualified professionals with adequate health and safety training and protective equipment.
20 What can we do? Public Meetings Health professionals involved Maternal Health Awareness Fish Consumption Advisories Dust Exposure Signs Asbestos-NOA Trails AML Trails NOA
21 Limited Fish Consumption Advisories Mercury OEHHA
22 Impaired Water Bodies for Mercury 303(d) listed CVRWQCB
23 Need More Fish Data 303(d) Listed as impaired by mercury (CVRWQCB 2010) Fish Consumption Advisory 2003 (OEHHA 2003) Fish Consumption Advisory 2009 Update (OEHHA 2009) Mercury-Impacted Water Way Deer Creek X X ** Upper Scotts Flat Lake X X ** Lower Scotts Flat Lake Lake Wildwood X Bear River X X ** Rollins Lake X X X Lake Combie X X X Camp Far West Reservoir X X X South Yuba River X X ** North Yuba River X Lake Englebright X X X Lower Yuba River (below Englebright) X
24
25 Long Term Solution-Clean it Up Mercury Removal from contaminated areas What was once a non-point source is no longer Abandoned Mine Remediation What was once remote is no longer Thank you-carrie Monohan, Ph.D. carrie.monohan@sierrafund.org
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