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HRS DOCUMENTATION RECORD COVER SHEET Name of Site: New Idria Mercury Mine EPA ID No. CA0001900463 Contact Persons Site Investigation: Matt Mitguard, EPA Region 9 Documentation Record: Karen Jurist, EPA Region 9 Pathways, Components, or Threats Not Scored Ground Water Pathway The ground water pathway was not scored because there are currently no known drinking water wells within four miles of site sources. Soil Exposure Pathway The soil exposure pathway was not scored because there are currently no known resident individuals, workers, sensitive environments, or resources on or within 200 feet of sources at the site. Air Migration Pathway The air pathway was not scored because there is no documented observed release to the atmosphere, and scoring the potential to release to air would not likely contribute significantly to the overall listing decision. HRS DOCUMENTATION RECORD Name of Site: New Idria Mercury Mine EPA Region: 9 Date Prepared: 3/2011 Street Address of Site: Township: 17S, Range: 12E City, County, State, Zip Code: Idria, San Benito County, CA 95043 Latitude: 36.418392 North Longitude: 120.672511 West (Ref. 18; Ref 21) Latitude/Longitude Reference Point: The latitude and longitude were measured from the centroid of Source 1, the Calcine Tailings Piles (Ref. 18; Ref. 21). Scores Air Pathway = not scored Ground Water Pathway = not scored Soil Exposure Pathway = not scored Surface Water Pathway = 63.33 HRS SITE SCORE = 31.66 *The street address, coordinates, and contaminant locations presented in this HRS documentation record identify the general area the site is located. They represent one or more locations EPA considers to be part of the site based on the screening information EPA used to evaluate the site for NPL listing. EPA lists national priorities among the known "releases or threatened releases" of hazardous substances; thus, the focus is on the release, not precisely delineated boundaries. A site is defined as where a hazardous substance has been "deposited, stored, placed, or otherwise come to be located." Generally, HRS scoring and the subsequent listing of a release merely represent the initial determination that a certain area may need to be addressed under CERCLA. Accordingly, EPA contemplates that the preliminary description of facility boundaries at the time of scoring will be refined as more information is developed as to where the contamination has come to be located. 1 HAZARD RANKING SYSTEM SUMMARY SCORESHEETS SITE NAME: New Idria Mercury Mine CITY/COUNTY/STATE: Idria, San Benito County, California EPA ID #: CA0001900463 EVALUATOR: Christina Marquis DATE: March 2011 LATITUDE: 36.418392 North LONGITUDE: 120.672511 West 2 S S Ground Water Migration Pathway Score (Sgw) Not scored Not scored Surface Water Migration Pathway Score (Ssw) 63.33 4,010.6889 Soil Exposure Pathway Score (Ss) Not scored Not scored Air Migration Pathway Score (Sa) Not scored Not scored 2 2 2 2 Sgw +Ssw + Ss + Sa XXXXXXX 4,010.6889 2 2 2 2 (Sgw +Ssw + Ss + Sa ) / 4 XXXXXXX 1,002.6722 2 2 2 2 SQRT ((Sgw +Ssw + Ss + Sa ) / 4) XXXXXXX 31.66 2 3/2011 SURFACE WATER OVERLAND/FLOOD MIGRATION COMPONENT SCORESHEET REF. 1, TABLE 4-1 Factor Categories and Factors Maximum Value Value Assigned DRINKING WATER THREAT Likelihood of Release: 1. Observed Release 550 550 2. Potential to Release by Overland Flow: 2a. Containment 10 NS 2b. Runoff 25 NS 2c. Distance to Surface Water 25 NS 2d. Potential to Release by Overland Flow (lines 2a x [2b + 2c]) 500 NS 3. Potential to Release by Flood: 3a. Containment (Flood) 10 NS 3b. Flood Frequency 50 NS 3c. Potential to Release by Flood (lines 3a x 3b) 500 NS 4. Potential to Release (lines 2d + 3c, subject to a maximum of 500) 500 NS 5. Likelihood of Release (higher of lines 1 and 4) 550 550 Waste Characteristics: 6. Toxicity/Persistence a 10,000 7. Hazardous Waste Quantity a 10,000 8. Waste Characteristics 100 100 Targets: 9. Nearest Intake 50 0 10. Population: 10a. Level I Concentrations b 0 10b. Level II Concentrations b 0 10c. Potential Contamination b 0 10d. Population (lines 10a + 10b + 10c) b 0 11. Resources 5 5 12. Targets (lines 9 + 10d + 11) b 5 3 3/2011 Factor Categories and Factors Maximum Value Value Assigned DRINKING WATER THREAT (Concluded) Drinking Water Threat Score: 13. Drinking Water Threat Score ([lines 5 x 8 x 12]/82,500, subject to a maximum of 100) 100 3.33 HUMAN FOOD CHAIN THREAT Likelihood of Release: 14. Likelihood of Release (same value as line 5) 550 550 Waste Characteristics: 15. Toxicity/Persistence/Bioaccumulation a 500,000,000 16. Hazardous Waste Quantity a 10,000 17. Waste Characteristics 1,000 1,000 Targets: 18. Food Chain Individual 50 0 19. Population: 19a. Level I Concentrations b 0 19b. Level II Concentrations b 0 19c. Potential Human Food Chain Contamination b 0 19d. Population b 0 (lines 19a + 19b + 19c) 20. Targets (lines 18 + 19d) b 0 Human Food Chain Threat Score: 21. Human Food Chain Threat Score ([lines 14 x 17 x 20]/82,500, subject to a maximum of 100) 100 0 4 3/2011 Factor Categories and Factors Maximum Value Value Assigned ENVIRONMENTAL THREAT Likelihood of Release: 22. Likelihood of Release (same value as line 5) 550 550 23. Ecosystem Toxicity/Persistence/ Bioaccumulation a 500,000,000 24. Hazardous Waste Quantity a 10,000 25. Waste Characteristics 1,000 1,000 Targets: 26. Sensitive Environments: 26a. Level I Concentrations b 0 26b. Level II Concentrations b 750 26c. Potential Contamination b 0 26d. Sensitive Environments (lines 26a + 26b + 26c) b 750 27. Targets (value from 26d) B 750 Environmental Threat Score: 28. Environmental Threat Score ([lines 22 x 25 x 27]/82,500, subject to a maximum of 60) 60 60 SURFACE WATER OVERLAND/FLOOD MIGRATION COMPONENT SCORE FOR A WATERSHED 29. Watershed Scorec (lines 13 + 21 + 28, 63.33 subject to a maximum of 100) 100 SURFACE WATER OVERLAND/FLOOD MIGRATION COMPONENT SCORE c 30. Component Score (Sof) , (highest score from line 29 for all watersheds evaluated, subject to a maximum of 100) 100 63.33 aMaximum value applies to waste characteristics category. bMaximum value not applicable. cDo not round to nearest integer. 5 3/2011 REFERENCES Reference Description of the Reference Number Hazard Ranking System; Final Rule, 14 December 1990, Vol. 55, No. 241, 138 pages. 1 Available at: http://www.epa.gov/superfund/sites/npl/hrsres/index.htm#HRS%20Rule. U.S. Environmental Protection Agency (EPA), Superfund Chemical Data Matrix 2 (SCDM) Methodology, January 2004, 15 pages. A complete copy of SCDM is available at http://www.epa.gov/superfund/sites/npl/hrsres/tools/scdm.htm. Weston Solutions, Inc., New Idria Mercury Mine, Expanded Site Inspection, Idria, 3 San Benito County, California, Sampling and Analysis Plan, April 2010, 48 pages. Ecology & Environment, Inc., New Idria Mercury Mine, Preliminary Assessment/Site 4 Inspection, March 31, 1998, 68 pages. Dames & Moore, Application for Facility Permit/Waste Discharge, New Idria Mine, 5 Idria, California 95021, April 21, 1989, 22 pages. Weston Solutions, Inc., Expanded Site Inspection Report, New Idria Mercury Mine, 6 San Benito County, California, October 2010, 1200 pages. Bureau of Land Management, Draft Clear Creek Management Area Resource 7 Management Plan & Environmental Impact Statement, Hollister, California, November 2009, 735 pages. University of California Santa Cruz, Mercury Speciation in Acid Mine Drainage: 8 New Idria Quicksilver Mine, California, September 1998, 41 pages. California Regional Water Quality Control Board, Central Valley Region, New Idria 9 Mine, San Benito County – Complaint Investigation, June 2, 1975, 4 pages. California Regional Water Quality Control Board, Central Valley Region, Inspection 10 of New Idria Mine, San Benito County, July 22, 1988, 6 pages. California Regional Water Quality Control Board, Central Valley Region, New Idria 11 Mine, San Benito County, March 7, 2003, 15 pages. TechLaw, Inc., Potentially Responsible Party and Insurance Archeology Search 12 Report, New Idria Mercury Mine Site, San Benito County, California, June 5, 2006, 205 pages. U.S. Environmental Protection Agency, Region IX, Wetlands Regulatory Office (WTR-8), Summary of Site Inspection to Verify the Presence of Jurisdictional 13 Wetlands for the New Idria Mercury Mine Site, including San Carlos and Silver Creeks, San Benito and Fresno Counties, California, December 16, 2010, 18 pages. Weston Solutions, Inc., Expanded Site Inspection. Logbook, New Idria Mercury 14 Mine, July 6, 2010 through July 23, 2010, 8 pages. U.S. Bureau of Mines, Mercury Potential of the United States, Information Circular 15 8252, 1965, 34 pages. U.S. Environmental Protection Agency, Solid Waste and Emergency Response, Using 16 Qualified Data to Document an Observed Release and Observed Contamination, November 1996, 18 pages. 6 3/2011 County of San Benito, Proposal by the County of San Benito before the Central Valley Regional Water Quality Control Board – Request for Investigation, Enforcement, and 17 Regional Planning necessary to clean up and abate the discharge of pollutants from the New Idria Mercury Mine in San Benito County, undated, 28 pages. 18 U.S. Geological Survey, Idria, California 7.5 Minute quadrangle 1969, 1 page. National Operations Center, Sampling and Analysis Plan, Archer Mine, April 15, 19 2009, 12 pages. Weston Solutions, Inc., Surface Water Pathway and Target Distance Limit Map, New 20 Idria Mercury Mine, December 13, 2010, 1 page. Weston Solutions, Inc., Site Latitude and Longitude and Source Area, New Idria 21 Mercury Mine, December 13, 2010, 1 page. Meierer, Bob, CompuChem, Memorandum to Stan Kott, ESAT/ICF-LDC, Case#: 22 40334, SDG#: MY71L3, October 5, 2010, 339 pages. Meierer, Bob, CompuChem, Memorandum to Stan Kott, ESAT/ICF-LDC, Case#: 23 40334, SDG#: MY71M9, October 11, 2010, 264 pages. CompuChem, Memorandum to Garrett Peterson, U.S.
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