HRS DOCUMENTATION RECORD COVER SHEET Name of Site: Dwyer Property Ground Water Plume EPA ID No.: MDD985366756 Contact Persons Site Investigation: Arthur O’Connell Chief, Brownfields/Superfund Division Maryland Department of the Environment 1800 Washington Boulevard Baltimore, Maryland 21230-1719 (410) 537-3493 [email protected] HRS Documentation Record: Lorie Baker NPL Coordinator/Site Assessment Manager U.S. Environmental Protection Agency 1650 Arch Street Philadelphia, Pennsylvania 19103-2029 (215) 814-3355 [email protected] Pathways, Components, or Threats Not Scored The Dwyer Property Ground Water Plume site is being evaluated as an area of ground water contamination with unknown sources. Preliminary scores for the surface water migration, air migration, and soil exposure pathways indicated minimal contribution of these to the overall site score; therefore, these pathways have not been included in this HRS documentation record. The surface water migration pathway ground water to surface water component score was low due to the lack of hazardous substances with high bioaccumulation factor values. Additionally, an overland runoff pathway likely does not exist. The lack of documented observed contamination and resident targets limit the soil exposure pathway scores. No observed release to the air has been documented within a 4-mile radius of the ground water plume. Surface Water Overland Migration Pathway The surface water pathway was not scored. The ground water pathway was sufficient to list the site. Soil Exposure Pathway The soil exposure pathway was not scored. The ground water pathway was sufficient to list the site. Air Migration Pathway The air migration pathway was not scored. The ground water pathway was sufficient to list the site. HRS DOCUMENTATION RECORD Name of Site: Dwyer Property Ground Water Plume Date Prepared: October 2010 EPA Region: 3 Street Address of Site*: The Dwyer Property Ground Water Plume site is located northeast of the intersection of Maryland Route 545 and Maryland Route 279 (Elkton Road) in Elkton, Cecil County, Maryland, as shown in Reference 3. City, County, State, Zip Code: Elkton, Cecil County, Maryland 21921 General Location in the State: Northeast corner of Maryland Topographic Map: Elkton, Maryland Latitude: 39.612007 North Longitude: -75.844474 West (Ref. 3; Ref. 4; Ref. 5) The latitude and longitude were measured at the northwest corner of the building shown in Reference 4. * 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 the Comprehensive Environmental Response, Compensation, and Liability Act. 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. Scores Air Pathway Not scored Ground Water Pathway 100 Soil Exposure Pathway Not scored Surface Water Pathway Not scored HRS SITE SCORE: 50.00 GEN-1 WORKSHEET FOR COMPUTING HRS SITE SCORE 2 S S 1. Ground Water Migration Pathway Score (Sgw) 100 10,000 2a. Surface Water Overland/Flood Migration Component Not Scored (from Table 4-1, line 30) 2b. Ground Water to Surface Water Migration Component Not Scored (from Table 4-25, line 28) 2c. Surface Water Migration Pathway Score (Ssw) Not Scored Enter the larger of lines 2a and 2b as the pathway score. 3. Soil Exposure Pathway Score (Ss) Not Scored (from Table 5-1, line 22) 4. Air Migration Pathway Score (Sa) Not Scored (from Table 6-1, line 12) 2 2 2 2 5. Total of Sgw + Ssw + Ss + Sa 100 6. HRS Site Score 50.00 Divide the value on line 5 by 4 and take the square root GEN-2 HRS Table 3-1 –Ground Water Migration Pathway Scoresheet Maximum Value Factor Categories and Factors Value Assigned Likelihood of Release to an Aquifer: 1. Observed Release 550 550 2. Potential to Release: 2a. Containment 10 2b. Net Precipitation 10 2c. Depth to Aquifer 5 2d. Travel Time 35 2e. Potential to Release [lines 2a x (2b + 2c + 2d)] 500 3. Likelihood of Release (higher of lines 1 and 2e) 550 550 Waste Characteristics: 4. Toxicity/Mobility (a) 10,000 5. Hazardous Waste Quantity (a) 10,000 6. Waste Characteristics 100 100 Targets: 7. Nearest Well 50 9 8. Population: 8a. Level I Concentrations (b) 8b. Level II Concentrations (b) 8c. Potential Contamination (b) 209 8d. Population (lines 8a + 8b + 8c) (b) 209 9. Resources 5 5 10. Wellhead Protection Area 20 5 11. Targets (lines 7 + 8d + 9 + 10) (b) 228 Ground Water Migration Score For An Aquifer: 12. Aquifer Score [(lines 3 x 6 x 11)/82,500]c 100 100 Ground Water Migration Pathway Score: 13. Pathway Score (Sgw), 100 100 (highest value from line 12 for all aquifers evaluated)c a. Maximum value applies to waste characteristics category. b. Maximum value not applicable. c. Do not round to nearest integer. GEN-3 REFERENCES Ref. No. Description of the Reference 1. U.S. Environmental Protection Agency. (EPA). Hazard Ranking System (HRS): Final Rule. Title 40 of the Code of Federal Regulations (CFR), Part 300; Federal Register, Volume 55, No. 241. On-Line Address: http://www.epa.gov/superfund/sites/npl/hrsres/index.htm#HRS%20Rule December 14, 1990. 138 pages. 2. EPA. Superfund Chemical Data Matrix. (Note: A complete copy of SCDM is available at On- Line Address: http://www.epa.gov/superfund/sites/npl/hrsres/tools/scdm.htm.) Excerpt 16 pages. 3. Tetra Tech EM Inc. (Tetra Tech). Ground Water Plume, Elkton, Cecil County, Maryland. Site Location Map. October 22, 2009. 1 page. 4. Tetra Tech EM Inc. Project Note for the Dwyer Property. Subject Latitude and Longitude of the Dwyer Property using Google Earth©. May 17, 2010. 1 page. 5. United States Department of the Interior Geological Survey (USGS). Topographic Map for Elkton, Maryland. 1992. 1 sheet. 6. EPA. Safe Drinking Water Information System for Cecil County. Accessed on January 22, 2010. On-Line Address: http://www.epa.gov/enviro/html/sdwis/sdwis_query.html. 9 pages. 7. Tetra Tech. 4-Mile Radius Map. May 18, 2010. 1 sheet. 8. Maryland Department of the Environment (MDE). Expanded Site Inspection for the Dwyer Property (MD-313), Elkton, Cecil County, Maryland. January 2001. 58 pages. 9. Tetra Tech. Record of Telephone Conversation. Between Alicia Shultz, Tetra Tech, HRS Specialist, and Kim Kamp, Town of Elkton. November 5, 2009. 1 page. 10. Tetra Tech. Population Served by the Town of Elkton Wells. January 22, 2010. 1 page. 11. MDE. Application for Permit to Drill Well. Town of Elkton. 1979 and 1980. 4 pages. 12. American Fact Finder. Population Data for Cecil County, Maryland. Accessed on January 22, 2010. 1 page. On-Line Address: http://factfinder.census.gov/servlet/ACSSAFFFacts?_event=Search&geo_id=&_geoContext=&_st reet=&_county=cecil&_cityTown=cecil&_state=04000US24&_zip=&_lang=en&_sse=on&pctxt= fph&pgsl=010. 13. Tetra Tech Inc. Final Remedial Investigation Report. Remedial Investigation and Feasibility Study. Volume 1 of 2. Dwyer Site (MD 313), Elkton, Cecil County, Maryland (includes full copies of several reports as Appendices). August 2005. 510 pages. 14. MDE. Site Investigation, Dwyer Property, MD-313, Routes 279 and 545, Elkton, Cecil County, Maryland. November 2002. 196 pages. GEN-4 15. MDE. A Screening Site Inspection of Dwyer Property, Elkton, Maryland (MD-313), Final Report, December 1989. 69 pages. 16. MDE. A Preliminary Assessment of Dwyer Property, Elkton, Maryland (MD-313). Final Report. March.1989. 30 pages. 17. Little Elk Creek Reuse Committee. Area-Wide One Cleanup Program Pilot Project. May 2006. 107 pages. 18. Tetra Tech. Potential Sources of Contamination. March 10, 2010. 1 page. 19. Town of Elkton. 2008 Annual Drinking Water Quality Report, Town of Elkton, Cecil County, Maryland. 2008. 5 pages. 20. Forest Green Court. Water Quality Report for 2007, Forest Green Court. April 1, 2008. 2 pages. 21. MDE. Community Supply Wells. January 22, 2010. 1 page. 22. Tetra Tech. Record of Conversation. Between David Black, Cecil County Department of Planning and Zoning, Geographic Information System (GIS) Coordinator and Alicia Shultz, HRS Specialist. October 10, 2009. 1 page. 23. Town and County Mobile Home Park. Annual Drinking Water Quality Report. 2009. 2 pages. 24. Forest View Village and Sherwood Forest Mobile Home Park. Annual Drinking Water Quality Report. June 23, 2009. 4 pages. 25. MDE. Wellhead Protection. Accessed on January 22, 2010. 1 page. On-Line Address: http://www.mde.state.md.us/Programs/WaterPrograms/Water_Supply/sourcewaterassessment/well head.asp. 26. TechLaw, Inc. Final Report, Site Operations/Ownership History, Cecil Industrial Park Site, Elkton, Maryland (Formerly Triumph Explosives, Inc., Site). Prepared for U.S. Army Corps of Engineers. Contract No. DACA45-89-D-0512. September 1, 1992. 48 pages. 27. Chesapeake GeoSciences, Inc. (CGS). Comprehensive Groundwater Monitoring Well Data. MDE-LRP-Dwyer Property. November 17, 2009. 9 pages. 28. Tetra Tech. Aerial Photograph of the Area Surrounding Maryland Route 279 and Route 545. March 2, 2010. 1 sheet. 29. CGS. Dwyer Property and Extension, Blue Ball, Elkton and Singerly Roads, Elkton, Maryland. Figure 1, MIP Boring and Monitoring Well Location Map. September 2009. 1 sheet. 30. Agency for Toxic Substances and Disease Control (ATSDR).