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PUBLIC HEALTH ASSESSMENT

EASTERN SURPLUS COMPANY SITE
MEDDYBEMPS, WASHINGTON COUNTY, MAINE


APPENDICES

APPENDIX A: FIGURES

Eastern Surplus Vicinity Map
Figure 1. Eastern Surplus Vicinity Map

Eastern Surplus Site Layout
Figure 2. Eastern Surplus Site Layout

Eastern Surplus Demographics Information
Figure 3. Eastern Surplus Demographics Information

Private Well Sample Locations
Figure 4. Private Well Sample Locations

Monitoring Well Sample Locations
Figure 5. Monitoring Well Sample Locations

Surface Soil Sample Locations
Figure 6. Surface Soil Sample Locations

On-site Surface Water and Sediment Sample Locations
Figure 7. On-site Surface Water and Sediment Sample Locations

Off-site Surface Water and Sediment Sample Locations
Figure 8. Off-site Surface Water and Sediment Sample Locations


APPENDIX B: TABLES

Table 1.

Demographics for 1-mile radius of Eastern Surplus Site, Meddybemps, Maine
  Site area ZIP code 04567 Washington County
Total population 24* - 62* - 35,308 --
White 24 100% 62 100% 33,704 95.5%
Black 0 0% 0 0% 54 0.2%
American Indian, Eskimo, Aleut 0 0% 0 0% 1,442 4.1%
Asian or Pacific Islander 0 0% 0 0% 88 0.2%
Other 0 0% 0 0% 20 0.1%
Hispanic Origin 0 0% 0 0% 164 0.5%
Less than 18 Years of Age -- -- 7 11.3% 9,040 25.6%
18 Years of Age or Greater -- -- 55 88.7% 26,268 74.4%
Children Aged 6and Younger 2 8.3% 0 0% 2,250 5.3%
Females Aged 15-44 4 16.7% 8 12.9% 7,382 20.4%
Adults Aged 65 and Older 4 16.7% 15 24.2% 5,694 17.3%
Total Housing Units 93 -- 207 -- 19,124 --
Occupied -- -- 24 11.6% 13,418 70.2%
Owner Occupied -- -- 24 11.6% 10,568 55.3%
Median Housing Value -- -- 125,000 -- 53,100 --

Source: 1, 5

Notes:
* the town of Meddybemps has a population of 142 which is said to approximately triple in the summer (1)
under 5 years
Site area statistics from 1990 census
ZIP code from 1990 census
County statistics from 1990 census


Table 2.

Exposure pathways, Eastern Surplus Site, Meddybemps, Maine
Pathway Name Exposure Pathway Elements Time Comments
Source Media Point of Exposure Route of Exposure Exposed Population
Ground-water as Drinking Water Eastern Surplus Groundwater Private Wells Ingestion,
Dermal contact
Year-round residents with private wells (approximately 142 in Meddybemps, Maine) Past, Current, Future No past, current, or future public health hazards are likely because contaminants were detected below levels likely to result in adverse health effects and groundwater remediation is underway at the site. No on-site use of groundwater has been identified, therefore contact with on-site groundwater is an incomplete exposure pathway.
Surface Soil Eastern Surplus Surface Soil Contaminated on-site areas , including VOC and PCB hot spots Incidental ingestion,
Dermal contact
Trespassers,
Past on-site residents and workers
Past, Current, Future The site is fenced to prevent site access; therefore, no exposures are expected. Remedial actions have removed areas of soil contamination and no adverse health effects are expected from exposures to surface soil. Past exposures to on-site residents, workers, or trespassers cannot be evaluated because data to characterize surface soil contamination before MEDEP, EPA, and DOD conducted remedial actions in the 1980s and 1990s are unavailable.
Surface water and sediment in Meddy-bemps Lake and Dennys River Eastern Surplus Surface water, Sediment Meddybemps Lake,
Dennys River (including Mill Pond)
Incidental ingestion,
Dermal contact
Recreational users Past, Current, Future Contact with contaminants in surface water and sediment in Meddybemps Lake and Dennys River (including Mill Pond) is unlikely to result in adverse health effects. Contaminants are present below levels likely to result in health effects, exposures are infrequent, and remedial actions have been conducted to prevent contaminant migration.
Surface water from Meddy-bemps Lake as drinking water Eastern Surplus Surface water Meddybemps Lake Ingestion,
Dermal Contact
Summer residents Past, Current, Future Some summer residents are reported to use surface water from Meddybemps Lake as a drinking water source. Only antimony was found slightly above comparison values in a background sample from Meddybemps Lake. Ingestion of antimony at the maximum detected concentration for 3 to 4 months a year is unlikely to result in adverse health effects. Ongoing remediation at the site will further prevent site impacts to the lake. No past, current, of future use of lake water for drinking water by summer residents is likely to result in adverse health effects.
Air Eastern Surplus Air Site vicinity Inhalation Nearby residents,
Trespassers
Past, Current, Future No air contaminants were detected off site, even during remedial activities. No data, however, are available to assess past airborne contamination when the site was active.
Biota Eastern Surplus Plants, Animals,
Fish,
Shellfish
Plants and animals from the site,
Fish and shellfish from Meddybemps Lake and Dennys River
Ingestion Recreational users, including the Passamaquoddy Tribe Past, Current, Future Current and future use of biota from Meddybemps Lake and Denny's River is unlikely to result in adverse health effects when following the state-wide fish consumption advisory. EPA and the Passamaquoddy tribe plan to meet to identify any plants they may use for medicinal or other purposes on the site. Remedial actions were implemented to reduce site contamination and prevent contaminant migration. Potential health hazards from former (prior to 1970) tribal subsistence gathering, hunting, and fishing are unknown because no data were collected to characterize site conditions before remediation in the 1980s and 1990s.
Physical hazards Eastern Surplus Physical hazard Former hydroelectric power unit Physical hazard Trespassers Past, Current, Future A dilapidated hydroelectric unit spans Dennys River along the southern site shoreline. Access from the west is restricted by a fence surround the site, but access from the east is unrestricted.


Table 3.

Groundwater contaminants detected above ATSDR comparison values for the Eastern Surplus site, Meddybemps, Maine
Chemical Max. Conc.
In parts per billion (ppb)
Date CV Type Exceedences / Detections / Samples Location of maximum
Benzene 2 12/11/96 0.6 CREG 3 / 3 / 279 MW-1B, MW-16S
Chloromethane 55 6/17/98 2.1 RBC-C 2 / 6 / 277 AP-06
1,1-Dichloroethene 3 6/14/98 0.06
90
CREG
C-EMEG-child
6 / 6 / 279
0 / 6 / 279
MW-8B
1,2-Dichloroethene (total) 440 11/6/98 55 RBC-N 4 / 15 / 137 MW-23M
Methylene chloride 6,300 11/6/98 5
600
CREG
RMEG-child
12 / 61 / 279
2 / 61 / 279
AP-06
Tetrachloroethylene (PCE) 7,900 11/5/98 5
100
MCL
RMEG-child
68 / 132 / 279 MW-20B
Toluene 650 12/4/97 200 I-EMEG-child 2 / 42 / 279 MW-8B
1,1,2-Trichloroethane 11 12/4/97 0.6
40
CREG
RMEG-child
1 / 1 / 278
0 / 1 / 278
MW-3B
Trichloroethylene (TCE) 380 11/19/97 5 MCL 51 / 61 / 279 MW-23M
Vinyl chloride 0.9 11/5/98 0.02
0.2
CREG
C-EMEG-child
1 / 1 / 279
1 / 1 / 279
MW-23M
Xylenes, total 2,700 11/6/98 2,000 I-EMEG-child 1 / 12 / 246 AP-06
Bis(2-ethylhexyl)phthalate 330 12/12/96 3
200
CREG
RMEG-child
8 / 21 / 134
1 / 21 / 134
MW-4B
Carbazole 5 9/4/96 3.3 RBC-C 1 / 1 / 134 MW-1B
Naphthalene 32 9/4/96 20 LTHA 1 / 2 / 166 MW-1B
PAHs, total 33 6/4/96 -- No CV -- / 2 / 110 MW-1B
Aldrin 0.0024 11/18/97 0.002
0.3
CREG
C-EMEG-child
1 / 2 / 37
0 / 2 / 37
MW-24B
PCBs, total 4,120.6 6/8/99 20 CREG 12 / 18 / 49 MW-17S
Aluminum 20,100 11/20/97 20,000 I-EMEG-child 1 / 140 / 227 MW-25S
Antimony 30 11/19/97 4 RMEG-child 7 / 15 / 222 MW-23M
Arsenic 65 6/11/99 0.02
3
CREG
C-EMEG-child
62 / 62 / 227
54 / 62 / 227
AP-06
Cadmium 15.6 6/14/98 2 C-EMEG-child 4 / 28 / 226 MW-8S
Chromium 713 6/7/97 30 RMEG-child 21 / 120 / 225 AP-05
Iron 51,600 12/11/96 11,000 RBC-N 13 / 185 / 227 AP-06
Lead 90 6/14/98 15 MCL Action Level 12 / 103 / 227 MW-8S
Manganese 26,800 11/19/97 500 RMEG-child 29 / 103 / 227 AP-06
Nickel 576 6/7/97 200 I-EMEG-child 3 / 146 / 225 AP-05
Silver 83.7 6/14/98 50 RMEG-child 1 / 15 / 222 MW-TB-08
Thallium 53.2 11/5/98 2.6 RBC-N 6 / 6 / 222 MW-8B
Vanadium 36.3 12/11/96 30 I-EMEG-child 1 / 69 / 225 MW-11S
Zinc 7,680 6/14/98 3,000 C-EMEG-child 3 / 153 / 227 MW-8S

Key:
C-EMEG-child = Environmental Media Evaluation Guide for chronic exposure to a child (ATSDR)
CREG = Cancer Risk Evaluation Guide (ATSDR)
CV = Comparison Value
Max. Conc. = maximum concentration
MCL = Maximum Contaminant Level
PCBs = polychlorinated biphenyls
ppb = parts per billion
RBC-C = Risk-Based Concentration for cancer effects (EPA)
RBC-N = Risk-Based Concentration for non-cancer effects (EPA)
RMEG-child = Reference Dose Media Evaluation Guide for a child (ATSDR)

Source: 1


Table 4.

Groundwater contaminants detected above ATSDR comparison values in private wells in the vicinity of the Eastern Surplus Site, Meddybemps, Maine
Chemical Max. Conc. Date CV Type Exceedences / Detections / Samples Drinking well (DW-) numbers with exceedences
(number of exceedences)
Tetrachloroethylene (PCE) 8.6 6/5/97 5 MCL 1 / 3 / 55 38*
Bis(2-ethylhexyl)phthalate 6 9/30/96 3
200
CREG
RMEG-child
1 / 4 / 46
0 / 4 / 46
27*
--
Arsenic 40.8 9/5/96 0.02
3
CREG
C-EMEG-child
30 / 30 / 55
27 / 30 / 55
01 (4), 06, 11, 13, 17 (6), 20, 21 (2), 24, 25*, 26, 27, 28, 29 (9)
01, 06, 11, 13, 17 (6), 20, 21 (2), 24, 25*, 26, 27, 28, 29 (9)
Manganese 836 9/4/96 500 RMEG-child 4 / 37 / 55 01 (4)*
Thallium 6.2 9/4/96 2.6 RBC-N 2 / 2 / 55 02*, 03*
Zinc 3,600 9/4/96 3,000 C-EMEG-child 1 / 17 / 55 03*

All units are ppb

Key:
C-EMEG-child = Environmental Media Evaluation Guide for Chronic exposure to a child (ATSDR)
CREG = Cancer Risk Evaluation Guide (ATSDR)
CV = Comparison Value
Max. Conc. = Maximum concentration
MCL = Maximum Contaminant Level
ppb = parts per billion
RBC-C = Risk-Based Concentration for Cancer effects (EPA)
* = maximum detection occurred at this location.

Source: 1


Table 5.

On-site surface soil contaminants detected above ATSDR comparison values at the Eastern Surplus Site, Meddybemps, Maine
Chemical Max. Conc. Date CV Type Exceedences / Detections / Samples Location of maximum
Methylene chloride 40,000 10/21/96 90
10,000
CREG
C-EMEG-child
4 / 12 / 419 SS096
4-Methyl-2-pentanone 23 10/21/96 -- none -- / 6 / 40 SS096
Benzo(a)pyrene 0.4 10/8/97 0.1 CREG 2 / 4 / 26 SS108
Benzo(g,h,i)perylene 0.19 10/8/97 -- none -- / 4 / 26 SS108
Bis(2-ethylhexyl)phthalate 60 11/8/97 50
1,000
CREG
RMEG-child
1 / 10 / 26
0 / 10 / 26
ES-GS-BII07-0001
Dibenzo(a,h)anthracene 0.18 10/8/97 0.087 RBC-C 3 / 3 / 26 SS108
PAHs, total 7.068 10/8/97 -- none -- / 8 / 26 SS108
Phenanthrene 0.21 10/8/97 -- none -- / 5 / 26 SS108
Dieldrin 0.061 11/8/97 0.04
3
CREG
C-EMEG-child
1 / 7 / 37
0 / 7 /37
ES-GS-BII06-0001
Endosulfan sulfate 0.0041 11/11/97 -- none -- / 1 / 37 ES-GS-BIV07-0001
Aroclor-1248 6.4 9/23/98 0.32 RBC-C 1 / 1 / 412 ES-SS-15-0001
Aroclor-1254 8 9/23/98 1 RMEG-child 6 / 18 / 412 ES-SS-15-0001
Aroclor-1260 560 10/8/97 0.32 RBC-C 78 / 111 / 412 SS114
PCBs, total 560 10/8/97 0.4 CREG 90 / 120 / 412 SS114
Antimony 64.5 10/21/96 20 RMEG-child 4 / 45 / 102 SS096
Arsenic 105 10/21/98 0.5
20
CREG
C-EMEG-child
114 / 114 / 477
34 / 114 / 477
ES-SS-154-0001
Cadmium 270 9/23/98 10 C-EMEG-child 11 / 47 / 478 ES-DP-41-0002
Chromium 13,800 10/21/96 200 RMEG-child 51 / 143 / 477 SS096
Iron 180,000 10/8/97 23,000 RBC-N 56 / 102 / 102 SS108
Lead 1,500 10/13/98 400 EPA SSL 10 / 170 / 477 ES-SS-113-0001

All units are ppm.

Key:
C-EMEG-child = Environmental Media Evaluation Guide for Chronic exposure to a child (ATSDR)
CREG = Cancer Risk Evaluation Guide (ATSDR)
CV = Comparison Value
Max. Conc. = Maximum Concentration
PAHs = Polynuclear aromatic hydrocarbons
PCBs = Polychlorinated biphenyls
ppm = parts per million
RBC-C = Risk-Based Concentration for Cancer effects (EPA)
RMEG-child = Reference Dose Media Evaluation Guide for a child (ATSDR)
SSL = Soil Screening Level (EPA)

Source: 1


Table 6.

Off-site surface soil contaminants detected above ATSDR comparison values in the vicinity of Eastern Surplus Site, Meddybemps, Maine
Chemical Max. Conc. Date CV Type Exceedences / Detections / Samples Location of maximum
Arsenic 63 10/22/98 0.5
20
CREG
C-EMEG-child
5 / 5 / 5
1 / 5 / 5
DP-120 (south of site)
Aroclor-1260 0.46 10/8/97 0.32 RBC-C 1 / 2 / 4 SS116 (west of site)
PCBs, total 0.46 10/8/97 0.4 CREG 1 / 2 / 4 SS116 (west of site)

All units are ppm.

Key:
C-EMEG-child = Environmental Media Evaluation Guide for Chronic exposure to a child (ATSDR)
CV = Comparison Value
Max. Conc. = Maximum Concentration
PAHs = Polynuclear aromatic hydrocarbons
PCBs = Polychlorinated biphenyls
ppm = part per million
RBC-C = Risk-Based Concentration for Cancer effects (EPA)

Source: 1


Table 7.

Surface water contaminants detected above ATSDR comparison values in the vicinity of the Eastern Surplus Site, Meddybemps, Maine
Chemical Max. Conc. Date CV Type Exceedences / Detections / Samples Location of maximum
Tetrachloroethylene (PCE) 270 6/17/99 5
100
MCL
RMEG-child
5 / 5 / 37
2 / 5 / 37
SW-406
Trichloroethylene (TCE) 76 6/17/99 5 MCL 6 / 6 / 37 SW-406
Bis(2-ethylhexyl)phthalate 480 10/6/97 3
200
CREG
RMEG-child
2 / 5 / 38
1 / 5 / 38
SW-118
Antimony 7.4 10/6/97 4 RMEG-child 3 / 4 / 44 SW-122
Arsenic 3.8 10/6/97 0.02
3
CREG
C-EMEG-child
2 / 2 / 44
1 / 2 / 44
SW-119
Manganese 1,410 6/17/99 500 RMEG-child 1 / 43 / 44 SW-406
Thallium 5.7 10/2/96 2.6 RBC-N 1 / 1 / 44 SW-108

All units are ppb.

Key:
C-EMEG-child = Environmental Media Evaluation Guide for Chronic exposure to a child (ATSDR)
CREG = Cancer Risk Evaluation Guide (ATSDR)
CV = Comparison Value
Max. Conc. = Maximum Concentration
ppb = parts per billion
RBC-C = Risk-Based Concentration for Cancer effects (EPA)
RBC-N = Risk-Based Concentration for Non-cancer effects (EPA)
RMEG-child = Reference Dose Media Evaluation Guide for a child (ATSDR)

Source: 1


Table 8.

Sediment contaminants detected above ATSDR comparison values in the vicinity of the Eastern Surplus Site, Meddybemps, Maine
Chemical Max. Conc. Date CV Type Exceedences / Detections / Samples Location of maximum
Benzo(a)anthracene 5.8 10/3/96 0.87 RBC-C 1 / 19 / 73 SD-131
Benzo(b)fluoranthene 6.6 10/3/96 0.87 RBC-C 1 / 23 / 73 SD-131
Benzo(g,h,i)perylene 3.5 10/3/96 -- none -- / 7 / 73 SD-131
Benzo(a)pyrene 5.6 10/3/96 0.1 CREG 18 / 19 / 73 SD-131
Dibenzo(a,h)anthracene 1 10/3/96 0.087 RBC-C 1 / 1 / 73 SD-131
Indeno(1,2,3-cd)pyrene 3.7 10/3/96 0.87 RBC-C 1 / 10 / 73 SD-131
Phenanthrene 5.2 10/3/96 -- none -- / 16 / 73 SD-131
Endosulfan sulfate 0.0031 6/16/99 -- none -- / 1 / 81 ES-SD-409-03
Endrin aldehyde 0.0034 6/16/99 -- none -- / 4 / 81 ES-SD-406-03
Aroclor-1260 1.6 6/16/99 0.32 RBC-C 6 / 16 / 38 ES-SD-406-03
Total PCBs 7.89 6/17/98 0.4 CREG 9 / 74 / 81 ES-SD-303-01
Arsenic 31.9 10/7/97 0.5
20
CREG
C-EMEG-child
76 / 76 / 81
6 / 76 / 81
SD-151
Iron 43,900 10/1/96 23,000 RBC-N 16 / 79 / 81 SD-107

All units are ppm.

Key:
C-EMEG-child = Environmental Media Evaluation Guide for Chronic exposure to a child (ATSDR)
CREG = Cancer Risk Evaluation Guide (ATSDR)
CV = Comparison Value
Max. Conc. = Maximum Concentration
PCBs = Polychlorinated biphenyls
ppm = parts per million
RBC-C = Risk-Based Concentration for Cancer effects (EPA)
RBC-N = Risk-Based Concentration for Non-cancer effects (EPA)
RMEG-child = Reference Dose Media Evaluation Guide for a child (ATSDR)

Source: 1


Table 9.

Fish fillet contaminants detected above EPA's risk-based concentrations in the vicinity of the Eastern Surplus Site, Meddybemps, Maine
Chemical Max. Conc. RBC Type Exceedences / Detections / Samples Location of maximum
4,4'-DDE 0.0119 0.0093 C 2 / 13 / 36 DS02BT
Dieldrin 0.00381 0.0002 C 2 / 2 / 36 DS01BT
PCBs, total 0.062 0.0016 C 36 / 36 / 36 ES02SM
Arsenic 4.13 0.0021 C 30 / 30 / 36 MS04SM
Chromium 12.2 4.1 N 1 / 16 / 36 ES01SM
Lead 1.01 --   2 / 2 / 36 SC05SM
Mercury 3.94 0.14 N* 35 / 35 / 36 DW01SM

All units are ppm.

Notes:

  • All samples were taken on September 22 and 27, 1997.
  • Five fish samples, representing different ages and sizes, were collected from each of seven different sampling locations. The fillets from each fish were analyzed individually. The maximum concentrations, therefore, represents the concentration found in an individual fish.
  • Analysis results were normalized for lipid and moisture content using statistical models to allow for data comparisons across results.
  • Smallmouth bass were collected from each sampling location, except DS01BT and DS02BT, where brook trout were collected.

Key:
Max. Conc. = Maximum Concentration
PCBs = Polychlorinated biphenyls
ppm = parts per million
RBC-C = Risk-Based Concentration for Cancer effects (EPA)
RBC-N = Risk-Based Concentration for Non-cancer effects (EPA)
* for methylmercury

Source: 1


Table 10.

Whole body fish contaminants detected above EPA's risk-based concentrations in the vicinity of the Eastern Surplus Site, Meddybemps, Maine
Chemical Max. Conc. RBC Type Exceedences / Detections / Samples Location of maximum
4,4'-DDE 0.021 0.0093 C 8 / 64 / 71 DS02BT
Dieldrin 0.00711 0.0002 C 11 / 11 / 71 DS02BT
PCBs, total 0.330 0.0016 C 71 / 71 / 71 DW05SM
Arsenic 3.05 0.0021 C 34 / 34 / 71 MS06PS
Chromium 16.5 4.1 N 3 / 70 / 71 FP04SM
Lead 0.65 --   -- / 7 / 71 ES08WS
Mercury 1.91 0.14 N* 65 / 65 / 71 EM06SM

All units are ppm.

Notes:

  • All samples were taken on September 22 and 27, 1997.
  • Whole body results were generated either through analysis of the whole body fish sample or the combined results from separate analyses of the fish fillet and carcass samples.
  • Ten fish samples, representing different ages and sizes, were collected from each of seven different sampling locations and analyzed individually. Of the ten samples collected from each location, five samples were analyzed as whole body and five samples were analyzed separately as a fillet (see Table 9) and carcass. The maximum concentrations represents the concentration found in an individual fish.
  • Analysis results were normalized for lipid and moisture content using statistical models to allow for data comparisons across results.
  • Four fish species were collected for analysis: smallmouth bass (fillet and carcass), brook trout (fillet and carcass), pumpkinseed (whole body), and white sucker (whole body). Maximum concentrations of PCBs, chromium, and mercury were found in smallmouth bass; 4,4'-DDE and dieldrin in brown trout; arsenic in pumpkinseed; and lead in white sucker.

Key:
Max. Conc. = Maximum Concentration
PCBs = Polychlorinated biphenyls
ppm = parts per million
RBC-C = Risk-Based Concentration for Cancer effects (EPA)
RBC-N = Risk-Based Concentration for Non-cancer effects (EPA)
* for methylmercury

Source: 1


Table 11.

Mussels contaminants detected above EPA's risk-based concentrations in the vicinity of the Eastern Surplus Site, Meddybemps, Maine
Chemical Max. Conc. RBC Type Exceedences / Detections / Samples Location of maximum
PCBs, total 0.0099 0.0016 C 5 / 6 / 6 ES02AF
Arsenic 8.41 0.0021 C 6 / 6 / 6 FP01EC
Barium 452 95 N 6 / 6 / 6 EM01EC
Cadmium 5.8 1.4 N 6 / 6 / 6 ES01AF
Chromium 6.43 4.1 N 1 / 6 / 6 ES02AF
Iron 2,758 410 N 6 / 6 / 6 EM01EC
Lead 5.91 --   -- / 6 / 6 EM01EC
Manganese 4,262 190 N 6 / 6 / 6 EM01EC
Mercury 0.78 0.14 N* 3 / 3 / 6 EM01EC

All units are ppm.

Notes:

  • All samples were taken on September 22 and 27, 1997.
  • Each sample represents a composite of five mussels of similar size and species collected from one sampling location.
  • Analysis results were normalized for lipid and moisture content using statistical models to allow for data comparisons across results.
  • Two mussel species were collected for analysis: eastern elliptio and alewife floater. Maximum concentrations of arsenic, barium, iron, lead, manganese, and mercury were found in eastern elliptio; and maximum concentrations of PCBs, cadmium, and chromium were found in alewife floater.

Key:
Max. Conc. = Maximum Concentration
PCBs = Polychlorinated biphenyls
ppm = parts per million
RBC-C = Risk-Based Concentration for Cancer effects (EPA)
RBC-N = Risk-Based Concentration for Non-cancer effects (EPA)
* for methylmercury

Source: 1



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