HAZARD RANKING SYSTEM (HRS) DOCUMENTATION RECORD COVER SHEET Name of Site: General Dynamics Longwood EPA ID No.: FLR000091322 Contact Persons Documentation Record: Barbara Alfano, Remedial Project Manager U.S. Environmental Protection Agency, Region 4 61 Forsyth Street, S.W., 11th Floor Atlanta, Georgia 30303 (404) 562-8923 Jennifer Wendel, National Priorities List Coordinator U.S. Environmental Protection Agency, Region 4 61 Forsyth Street, S.W., 11th Floor Atlanta, Georgia 30303 (404) 562-8799 Pathways, Components, or Threats Not Scored The surface water migration, soil exposure, and air migration pathways were not scored in this Hazard Ranking System (HRS) documentation record because they are not expected to significantly contribute to the overall site score. Surface Water Migration Pathway: Between 1988 and 2005, surface water and sediment samples have been collected from the drainage channel (unnamed ditch) located between the General Dynamics property and the Sprague Electric Company (SEC) property, as well as Soldier Creek located downstream of the drainage ditch. Surface water and/or sediment samples collected from the drainage ditch contained trichloroethylene (TCE) and 1,1-dichloroethylene (DCE). No constituents were detected in the surface water and sediment sample collected from Soldier Creek (Ref. 8, Tables 4-1 and 4-2, Figure 2-2). Surface water runoff from the General Dynamics property drains into the east-west trending drainage ditch on the northern boundary of the SEC property. The ditch then flows about 0.5 mile east and northeast, where it discharges into Soldier Creek. Soldier Creek flows about 1.7 miles southeast into Lake Jesup which ultimately drains into the St. Johns River (Ref. 8, p. 3-1, Figure 2-2). Soil Exposure and Air Migration Pathways: Site-related contaminants have not been detected in surface soil samples collected from 0 to 2 feet below land surface (Refs. 8, pp. 4-11, 4-12; 10, pp. 24, 25; 46, Table 1, Figure 1; 49, Figure 3; 65; 77, p. 15; 89). Residential areas are located in the vicinity of the General Dynamics property (Refs. 10, p. 18; 11). Air and residential surface soil contamination has not been documented (Refs. 8, pp. 4-11, 4-12; 10, pp. 24, 25; 46, Table 1, Figure 1; 49, Figure 3; 65). As of June 2007, five people work at the Gould (referred to as General Dynamics in this HRS documentation record) property (Ref. 10, p. 35). The property consists of three buildings, paved parking and unpaved grass areas (Ref. 10, pp. 35, 51). The population within one mile is about 5,353 people (Ref. 14, pp. 1, 4). No air samples were collected at the General Dynamics property during the site inspection (Ref. 10, p. 37). The residential population within 4 radial miles of the property is about 94,432 people (Ref. 14, pp. 1,7). ------- HAZARD RANKING SYSTEM (HRS) DOCUMENTATION RECORD Name of Site: General Dynamics Longwood EPA Region: 4 Date Prepared: Date Revised: March 2009 September 2010 Street Address of Site*: 1333 North US Highway 17/92 City, County, State, Zip: Longwood, Seminole County, Florida, 32750 General Location in the State: Central portion of state, along the eastern coast Topographic Map: Casselberry, Florida, 1981 Latitude: 28.71662° North Longitude: -81.32122° West The coordinates above for General Dynamics were measured at the southeastern corner of Building 3 (Refs. 8, Figure 1-2; 13). * The street address, coordinates, and contaminant locations presented in this HRS documentation record identify the general area in which 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 its 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 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 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 defined as more information is developed as to where the contamination has come to be located. Migration Pathway Pathway Score Ground Water Migration Pathway 100.00 Surface Water Pathway NS Soil Exposure Pathway NS Air Migration Pathway NS HRS SITE SCORE 50.00 Note: NS Not scored 1 ------- WORKSHEET FOR COMPUTING HRS SITE SCORE S pathway S2 pathway Ground Water Migration Pathway Score (Sgw) 100 10,000 Surface Water Migration Pathway Score (Ssw) NS NS Soil Exposure Pathway Score (Ss) NS NS Air Migration Score (Sa) NS NS S2g„ + S2sw + S2s + s2a 10,000 (S2gw + S2sw + S2s + S2a)/4 2,500 / (S2gw + S2sw + S2s + S2a)/4 50.00 Note: NS = Not scored 2 ------- Table 3-1 —Ground Water Migration Pathway Scoresheet Aquifer Evaluated: Interconnected Surficial and Upper Floridan Aquifers Factor Categories and Factors Maximum Value Value Assigned Likelihood of Release to an Aquifer: 1. Observed Release 550 550 2. Potential to Release: 2a. Containment 10 NS 2b. Net Precipitation 10 NS 2c. Depth to Aquifer 5 NS 2d. Travel Time 35 NS 2e. Potential to Release [lines 2a(2b + 2c + 2d)] 500 NS 3. likelihood of Release (higher of lines 1 and 2e) 550 550 Waste Characteristics: 4. Toxicity/Mobility (a) 100 5. Hazardous Waste Quantity (a) 10 6. Waste Characteristics 100 6 Targets: 7. Nearest Well 50 20 8. 'opulation: 8a. Level I Concentrations (b) 0.00 8b. Level II Concentrations (b) 0.00 8c. Potential Contamination (b) 6,613.9 8d. Population (lines 8a + 8b + 8c) (b) 6,613.9 9. le sources 5 0 10. Wellhead Protection Area 20 5.00 11. Targets (lines 7 + 8d + 9 + 10) (b) 6,638.9 Ground Water Migration Score for an Aquifer: 12. Aquifer Score [(lines 3x6x1 l)/82,500]c 100 100.00 Ground Water Migration Pathway Score: 13. Pathway Score (Sgw), (highest value from line 12 for all aquifers valuated)c 100 100.00 Notes: NS a b _ c Not scored Maximum value applies to waste characteristics category Maximum value not applicable Do not round to nearest integer ------- LEGEND \///\ General Dynamics v Sprague Electric Company 1,000 1 Feet © MAP SOURCE: Reference 15, pp. 1 through 11. USGS, Casselberry, FL Topographic Quadrangle, 1981. SEMINOLE COUNTY FLORIDA A sm United States Environmental Protection Agency GENERAL DYNAMICS LONGWOOD LONGWOOD, SEMINOLE COUNTY, FLORIDA TDD No.TTEMI-05-003-0038 FIGURE 1 FACILITY LOCATION TETRATECH ------- LEGEND Contaminated Soil Sample location i j Building/Structure Outline Former Structures/Features J" General Dynamics Property Boundary Source: References 10, Figures 4, 6, and 7; 15, pp. 1 through 9; 16, pp. 8through 15, Exhibit 1; 17, pp. 18, 19, Exhibit 1; 46, Table 1. Figure 1: 49, Figure 3; 50. pp. 15, 16; 88, pp. 10, 11J4, 15. Aerial Photograph: DigitalGlobe/Globe Explorer, 3/08. Note: AST -Above Ground Storage Tank 1:1,200 © United States Environmental Protection Agency GENERAL DYNAMICS LONGWOOD LONGWOOD, SEMINOLE COUNTY, FLORIDA TDD No.TTEMI-05-003-0038 FIGURE 2 SOURCE LOCATION Revised August 2010 H. TETRATECH ------- ------- BLDG 1 BLDG2 BLDG 3 SEC FACILITY AREA GENERAL DYNAMICS FACILITY AREA FIGURE 4-Possible Upgradient Sample Locations Legend GENERAL DYNAMICS FACILITY AREA m m m SEC FACILITY AREA MAXIMUM POSSIBLE BACKGROUND UPGRADIENT AREA Note: Hatched area represents the area hydraulically upgradient of the observed release location. (Ref. 8, Fig. 3-6, 3-7, 4-29 through 4-32, 4-38, 4-39, A-1 through A-37; 46, Table 1, Figure 1) REVIEWED UPGRADIENT SAMPLE LOCATION SOURCE 2 OBSERVED RELEASE BACKGROUND SAMPLE LOCATION (DPGW-23) SOURCE 2 OBSERVED RELEASE SAMPLE LOCATION (DPGW-34 26,500 uq/Lpf 1,1-DCE) ------- REFERENCES 1. U. S. Environmental Protection Agency (EPA). Hazard Ranking System, 40 Code of Federal Regulations Part 300, Appendix A, 55 Federal Register 51532. December 14, 1990. 138 Pages. 2. EPA. Superfund Chemical Data Matrix. January 2004. 53 pages. A complete copy of SCDM is available at http://www. epa.gov/supcrfund/sitcs/npl/hrsres/tools/scdm.htm. 3. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note. Subject: Layout of Stromberg Carlson. October 13, 2008. 2 Pages. 4. Seminole County, Public Works, Trails and Greenways. Accessed on November 5, 2008. Online Address: http://visitseminole.com/pw/trails/trails.asp. 3 Pages. 5. Douglas Grant, Staff Scientist, Geraghty & Miller, Inc. Contamination Assessment Plan, Sprague Electric Company, Longwood, Florida. January 22, 1988. 28 Pages. 6. Geraghty & Miller, Inc. Contamination Assessment Report, Sprague Electric Company, Longwood, Florida. February 1990. 46 Pages. 7. Willard Harms, Project Coordinator, URS Corporation. Project Note. 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October 5, 2004. 50 Pages. Gould Publication of Florida, Inc., a Florida Corporation, Plaintiff, vs. Sprague Electric Company, et al., Defendant, Deposition of John Ford, Case Number 02-CA-1250-11-G. October 5, 2004. 44 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note. Subject: Gould Site Owner and Lessee Timeline. October 9, 2008. 6 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note. Subject: Area of Parcel 28- 20-30-501-0000-013A. August 25, 2008. 5 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note. Subject: Area of General Dynamics Property. August 25, 2008. 1 Page. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note. Subject: MACTEC Logbook Notes from the 2007 Site Inspection. October 9, 2008. 24 Pages. Ken Busen, J. Michael Wilson, and E. Randy Merchant, ORT III - Ground water Section. Ground water Investigation, Sprague Electric, Seminole County. January 1985. 32 Pages. E.C.Jordan. Preliminary Assessment. 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September 25, 2008. 4 Pages. 37. Shanna Davis, Environmental Scientist, Tetra Tech. Record of Telephone Conversation with Doug Taylor, Utility Superintendent, City of Winter Springs Utility Department with Attachments. Subject: City of Winter Springs Utility Department. August 26, 2008. 11 Pages. 38. St. Johns River Water Management District. Public Water Supplier Report, City of Sanford Consumptive Use Permit 162. August 12, 2008. 6 Pages. 39. St. Johns River Water Management District. Public Water Supplier Report, Seminole County Consumptive Use Permit 8213. August 12, 2008. 10 Pages. 40. St. Johns River Water Management District. Public Water Supplier Report, City of Lake Mary Consumptive Use Permit 8282. August 12, 2008. 6 Pages. 41. Gould Publication of Florida, Inc., a Florida Corporation, Plaintiff, vs. Sprague Electric Company, et al., Defendant, Deposition of Ralph Leo Spotts, Jr., Case Number 02-CA-1250-11- G. July 7, 2004. 52 Pages. 42. EPA/SEMARNAP Pollution Prevention Work Group. Pollution Prevention in the Electronics Industry. May 1996. 118 Pages. 43. EPA, Risk Reduction Engineering Laboratory Center for Environmental Research Information. Guides to Pollution Prevention, The Printed Circuit Board Manufacturing Industry. June 1990. 83 Pages. 44. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Regulatory Information Available Regarding the General Dynamics Property. September 5, 2008. 5 Pages. 45. Nancy McKee, Environmental Specialist, FDEP. Seminole County-HW, Gould Publications, Inc. - FLR000091322, Case Closed. May 20, 2003. 26 Pages. 46. URS Corporation. Contamination Assessment Report Addendum, Former Sprague Site, Longwood, Florida. June 2001. 30 Pages. 10 ------- 47. Gould Publication of Florida, Inc., a Florida Corporation, Plaintiff, vs. Sprague Electric Company, et al., Defendant, Deposition of George F. Anderson, Case Number 02-CA-1250-11-G. October 5, 2004. 7 Pages. 48. EPA, Office of Water. National Primary Drinking Water Standards. June 2003. 6 Pages. 49. Tom Lewis, P.G., Project Geologist, and Thomas Kwader, PhD, P.G., Senior Consulting Geologist, URS Corporation. Former Sprague Electric Preliminary Site Characterization Summary, Former Sprague Facility, Longwood, Seminole County, Florida. November 22, 2005. 171 pages. 50. Southeast Accutest Laboratories. Technical Report for URS Corporation, Sampling Date June 8, 2005. February 7, 2007. 102 Pages. 51. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: URS Data Validation Reports. October 9, 2008. 67 Pages. 52. EPA, Office of Research and Development. Technical Protocol for Evaluating Natural Attenuation of Chlorinated Solvents in Ground Water. September 1998. 248 Pages. 53. U.S. Department of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry. Toxicological Profile for Tetrachloroethylene. September 1997. 318 Pages. 54. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: URS August 2005 Logbook. November 11, 2008. 15 Pages. 55. U.S. Department of Agriculture, Soil Conservation Service. Soil Survey of Seminole County, Florida. March 1990. 179 Pages. 56. Willard Harms, Project Coordinator, URS Corporation. Project Note. Subject: Absence of Liner on the General Dynamics Property. October 9, 2008. 1 Page. 57. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Logbook for the August 2005 Remedial Investigation Conducted by URS Corporation. October 13,2008. 26 Pages. 58. KB Labs, Inc. From Michael Winslow, Quality Assurance Officer. To Kristin Taylor, URS. March 20, 2001. 15 Pages. 59. EPA. Hazardous Waste Test Methods, SW-846. September 10, 2008. Excerpt, 36 Pages. 60. Florida NPL/NPL Caliber Cleanup Site Summaries. Sprague Electric. Accessed on November 12, 2008. Online Address: http://w w w .cpa.gov/Region 4/waste/npl/nplfln/hipprdfl.htm. 1 Page. 61. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note. Subject: Seminole County Water Department. January 9, 2009. 1 Page. 62. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachment. Subject: Information Request from City of Lake Mary Water Department. January 9, 2009. 3 Pages. 63. Quinn Kelley, Environmental Scientist, Tetra Tech. Record of Telephone Conversation with Charlie Turner, Operations Manager, City of Sanford Department of Water and Sewer Utilities. Subject: City of Department of Water and Sewer Utilities - Confirmation of Information. January 20, 2009. 1 Page. 11 ------- 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 FDEP. Florida Geological Survey Data and Maps. Accessed on October 9, 2006. Internet Address: http ://www.dep .state .fl .us/geology/gisdatamaps/litholog .htm. 14 Pages. Quinn Kelley, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Request for Information from URS Corporation. January 19, 2009. 2 Pages. Quinn Kelley, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Request for Mobile Lab Data Reporting Limits. January 19, 2009. 3 Pages. Coastal Services Center, National Oceanic and Atmospheric Administration. Beach Nourishment: A Guide for Local Government Officials, Geologic Regimes of the Atlantic and Gulf Coasts. September 12, 2008. 5 Pages. United States Geologic Survey (USGS). Hydrogeology, Water Quality, and Simulated Effects of Ground-Water Withdrawals from the Floridan Aquifer System, Seminole County and Vicinity, Florida. 2001. 125 Pages. Florida Geological Survey Special Publication. Florida's Ground Water Quality Monitoring Program, Background Hydrogeochemistry. Special Publication No. 32. 44 Pages. Florida Geological Survey. Ground-Water Resources of Seminole County, Florida. Report of Investigations No. 27. 1962. 39 Pages. Brenda Shaw, TN & Associates, Inc. Project Note with Attachments. Subject: FDEP/well construction and lithology for SEC. February 19, 2003. 48 Pages. Southeast Accutest Laboratories. Technical Report for URS Corporation, Sampling Date June 20 and 21, 2005. February 7, 2007. 152 Pages. URS Corporation. Gould Property Supplemental Site Investigation. February 2, 2004. 73 Pages. URS Corporation. Remedial Investigation/Feasibility Study Work Plan, Former Sprague Electric Facility, Longwood, Florida. March 2005. 1,574 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: URS May to July 2005 Logbooks. October 9, 2008. 68 Pages. Southeast Accutest Laboratories. Technical Report for URS Corporation, Sampling Date June 9, 2005. February 7, 2007. 94 Pages. Southeast Accutest Laboratories. Technical Report for URS Corporation, Sampling Date September 16, 2005. February 8, 2007. 104 Pages. James McCarthy, Professional Geologist I, Program and Technical Support Section, FDEP. Subject: Seminole County, Florida Karst Terrain and Karst Aquifer. December 16, 2008. 4 Pages. Comprehensive Quality Assurance Plan for KB Labs, Inc. Prepared by KB Labs, Inc. March 10, 2000. 45 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Logbook for the September 2005 Remedial Investigation Conducted by URS Corporation. October 13, 2008. 7 Pages. 12 ------- 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 Southeast Accutest Laboratories. Technical Report for URS Corporation, Sampling Dates August 1 and 2, 2005. February 7, 2007. 207 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: URS August 2005 Logbooks. October 9, 2008. 12 Pages. Southeast Accutest Laboratories. Technical Report for URS Corporation, Sampling Dates August 2 through 4, 2005. February 7, 2007. 243 Pages. Todd Romero, Director of Operations, KB Labs, Inc. Sprague Superfund, Longwood, FL - Final Data Report, KB Labs Project #05-121. June 21, 2005. 18 Pages. FDEP. Letter Regarding Quality Assurance Review; KB Labs, Inc. QA Plan #980029 Revision 3; Amendment to an Approved Document. From Deborah S. Koren, Environmental Assessment Section. To. Michael G. Winslow, KB Labs, Inc. June 30, 2000. 7 Pages. Jessica Vickers, Quality Assurance Manger, Tetra Tech. Project Note. Subject: Review of KB Labs Project Number 0106 Mobile Laboratory Data. December 16, 2008. 3 Pages. EPA, Region 4, Environmental Investigations Standard Operating Procedures and Quality Assurance Manual, November 2001. 413 Pages. Gould Publication of Florida, Inc., a Florida Corporation, Plaintiff, vs. Sprague Electric Company, et al., Defendant, Deposition of Quentin Glenn, Case Number 02-CA-1250-11-G. July 7, 2004. 46 Pages. Quinn Kelley, Environmental Scientist, Tetra Tech. Project Note with Attachment. Subject: KB Labs, Inc. Definition of Less Than Symbol. January 19, 2009. 3 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Well Construction Details. September 24, 2008. 3 Pages. Jessica Vickers, Quality Assurance Manager, Tetra Tech. Project Note. Subject: Review of KB Labs Project Number 05-121 Mobile Laboratory Data. December 16, 2008. 1 Page. Southeast Accutest Laboratories. Technical Report for URS Corporation, Sampling Dates September 14 and 15, 2005. February 8, 2007. 143 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Logbooks for the 2001 Contamination Assessment Conducted by URS Corporation. October 13, 2008. 31 Pages. Shanna Davis, Environmental Scientist, Tetra Tech. Record of Telephone Conversation with Doug Taylor, Utility Superintendent, City of Winter Springs Utility Department. Subject: City of Winter Springs Utility Department. September 29, 2008. 1 Page. Shanna Davis, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Sinkhole Database. September 29, 2008. 6 Pages. Handex of Florida, Inc. Site Assessment and Interim Remediation Evaluation, Former Sprague Electric Facility, Longwood, Seminole County, Florida. March 2002. 122 Pages. Quinn Kelley, Environmental Scientist, Tetra Tech. Record of Telephone Conversation with Scotty Haws, Regional Compliance Manager, Utilities Incorporated. Subject: Sanlando Utilities 13 ------- Corporation (subsidiary of Utilities Incorporated) - Confirmation of Information. January 20, 2009. 1 Page. 98. USGS. Hydrogeology and Water-Quality Characteristics of the Lower Floridan Aquifer in East- Central Florida, Water Resources Investigations Report 02-4193. 67 pages. 99. Quinn Kelley, Environmental Scientist, Tetra Tech. Project Note with Attachments. Subject: Aquifer Information for Sanlando Utilities Municipal Wells. February 25, 2009. 10 pages. 14 ------- SITE DESCRIPTION The General Dynamics Longwood site consists of a contaminated soil source on the eastern portion of the General Dynamics property (Source No. 2) and a release of a hazardous substance (1,1-DCE) to ground water (see Figures 2 and 3 of this HRS documentation record). A significant increase of 1,1-DCE has been documented underlying and downgradient of the contaminated soil source (Source No. 2) at the site (see Section 3.1.1 Observed Release of this HRS documentation record). The General Dynamics Longwood site is located within the General Dynamics property (also known as the Gould property) (Ref. 10, p. 3) (see Figures 2 and 3 of this HRS documentation record). The General Dynamics property is located at 1333 North US Highway 17/92 in Longwood, Seminole County, Florida (Ref. 12, pp. 5, 6) (see Figure 1 of this Hazard Ranking System [HRS] documentation record). More specifically, the geographic coordinates as measured from the southeastern corner of Building 3 are latitude 28.71662° north and longitude -81.32122° west (Refs. 3; 13). The General Dynamics property consists of four parcels covering an area of about 10.42 acres (Refs. 15, pp. 1 through 9; 19, p. 1 through 5; 20). Located on the eastern portion of this property is the scored source (Source No. 2). The western part of this property contains what was originally established as Source 1, and is part of the Sprauge Electric Company (SEC) Superfund Alternative Approach (SAA) site (see Figure 3 of this HRS documentation record). Land uses surrounding the property are predominately vacant, residential, industrial, and mixed commercial (Refs. 10, pp. 49, 50; 11; 15, pp. 10 through 19; 26, p. 2). The General Dynamics property is bounded by vacant land to the north, Sprague Electric Company (SEC) to the south, vacant commercial land to the east, and Highway 17-92 to the west (Ref. 15, pp. 10 through 19). The neighboring SEC property is about 12-acres and contains office and production buildings that contain capacitor manufacturing and assembly areas and a machine shop; a loading dock; storage areas; a fire protection well; septic tanks and associated drain fields; a retention pond, and one side of a drainage ditch located along the northern property boundary (Ref. 26, pp. 2, 3). A day care center is located to the east and adjacent to SEC (Ref. 21, p. 23). The General Dynamics property consists mostly of paved parking and unpaved grass areas. Access to the back of the property is restricted by a locked chain link fence (Ref. 10, p. 35). Structures on the General Dynamics property include three large manufacture buildings (Building Nos. 1, 2, and 3) among smaller buildings (Refs. 3; 10, p. 51; 16, pp. 9 through 13, Exhibit 1) (see Figure 2 of this HRS documentation record). Building Nos. 1, 2, and 3 were built at separate times between 1959 and 1965 (Refs. 3; 47, p. 4). Building 1 contained the lobby, plant manager's office, and personnel (Refs. 3; 16, p. 12, Exhibit 1). Building 2 contained an engineering drafting and test area (Refs. 3; 16, p. 11, Exhibit 1). Building 3 contained the manufacturing area, PC soldering, storage area, and a vapor degreaser (Refs. 3; 16, pp. 9, 10, 11, 14, 15, Exhibit 1). A building which contained a maintenance shop is located to the northeast of Building 1 (Refs. 3; 10, p. 51). A shed was located to the east of Building 3 which held 55 gallon containers of TCE (Ref. 17, pp. 18, 26, Exhibit 1). Painting and plating occurred east of Building 1 (Ref. 3). From about 1961 to December 1979, the General Dynamics facility (and its predecessors) operated on a larger parcel of land. In December 1979, SEC acquired a strip of east-west trending land to the south and a rectangular portion to the east (Ref. 8, p. 1-5, Figure 1-2). 15 ------- OPERATIONAL AND REGULATORY HISTORY Limited information exists on the operational history at General Dynamics. According to depositions of former General Dynamics' employees, General Dynamics (and its predecessors) manufactured printed circuit boards (Ref. 16, pp. 6, 7). Tenets at the General Dynamics property included Dynatronics (1959 to 1965); General Dynamics Corp. (1966 to 1978); Stromberg-Carlson, a subsidiary of General Dynamics Corp. (1979 to 1982); General Dynamics Land Systems, a subsidiary of General Dynamics Corp. (1983); Lexar Corporation and United Technologies Comm. Co. (1984 to 1985); and Lexar Corporation, UTCC, and Telex Computer Products (1986 to 1988). Gould Publications purchased the property in 1993 (Ref. 18). Gould Publications conducted printing and publication operations and, as of 2007, conducts wholesaling and warehouse activities (Ref. 10, p. 3). General Dynamics manufactured printed circuit boards (Refs. 16, pp. 6, 7; 41, p. 5). Printed circuit boards are metal clad dielectrics with conductors imprinted onto one or both sides of the board. The general assembly process of the printed circuit boards includes placing electrical components on the boards, the boards are then fluxed and components are affixed and soldered to the boards. General contaminants include: water insoluble or oily materials; water soluble materials including rosin flux activators, sodium chloride, and plating and etching salts; and particulates, such as dust, and machining, drilling, and punching fragments. A cleaning process is needed to remove residues from the board. Chemicals used in the cleaning process include chlorinated solvents such as trichloroethylene (TCE), 1,1,1-trichloroethane (TCA), perchloroethylene (PCE), and l,l,2-trichloro-l,2,2-trifluorethane, as well as various non-chlorinated solvents, such as acetone and alcohol (Refs. 42, p. II-9; 43, p. 5). According to a previous employee at General Dynamics, the manufacture of printed circuit boards included the use of a liquid resist (KPR). The panels would be placed in a copper roller coder material that would deposit a photo resist on to the boards. The boards would then be baked for several minutes followed by exposure to ultraviolet light. The boards were then placed in a degreaser (Ref. 41, p. 9). The vapor degreaser was about 4 feet wide by 4 feet deep by 5 feet high. The chemical used in the vapor degreaser was TCE (Ref. 41, pp. 10, 11). About 25 to 30 gallons of TCE were placed into the vapor degreaser a couple times a week (Ref. 41, pp. 11, 12, 13). TCE was stored in 55-gallon drums in a shed located to the east of Building 3 (Ref. 17, pp. 18, 26, Exhibit 1) (see Figure 2 of this HRS documentation record). At an unspecified time, TCE was stored in an above ground storage tank (AST) located outside Building 3 near the vapor degreaser (Ref. 88, pp. 10, 11, 14, 15) (see Figure 2 in this HRS documentation record). Additional vapor degreasers were located throughout the facility; however, the location of all the degreasers, as well as the solvents used in them, are unknown (Ref. 41, p. 8). Also, an underground storage tank is located near Source No. 2 (Ref. 8, pp. 1-4, 2-2, Figure 1-2) According to Florida Department of Environmental Protection (FDEP) personnel, no regulatory file information exists concerning operations at the General Dynamics property (Ref. 44, p. 1). However, a hazardous waste compliance inspection was conducted by FDEP in 2003 (Ref. 45, p. 2). Waste found on the property included acetic acid, ammonium thiosulfate, silver chloride, benzyl alcohol, paint, and ink, among others (Ref. 45, pp. 2, 6 through 13). The adjacent SEC facility manufactured film capacitors on the property from 1959 to 1992. From approximately 1959 to December 1964, a portion of the SEC property was owned by Dearborn Electronics of Delaware, Inc. (Dearborn). Both SEC and Dearborn manufactured film capacitors at the SEC property. Film capacitors were assembled, soldered, impregnated with wax mineral oil or silicon oil in a pressurized chamber, and then cleaned in a vapor degreaser (Ref. 26, p. 3). The chemicals TCA and TCE were used as cleaning agents in the vapor degreaser (Ref. 8, p. 1-5). The breakdown products of TCE include 1,1-dichloroethylene (DCE), cis-l,2-DCE, trans-1,2-DCE, and vinyl chloride. The breakdown products of PCE include TCE, 1,1-DCE, cis-l,2-DCE, trans-1,2-DCE, and vinyl chloride (Ref. 52, p. 24). The breakdown products of 1,1,1-TCA include 1,1-DCE (Ref. 52, p. 16 ------- B4-63). Deposition testimony of former General Dynamics employees indicates that TCE and 1,1,1-TCA (referred to in the testimony as "1,1,1-Tric") were used at the General Dynamics facility (Ref. 41, pp. 9 through 13; 88, pp. 7, 8). Solvents such as TCE, PCE, and 1,1,1-TCA are commonly used in printed circuit board manufacturing processes for metal cleaning and vapor degreasing (Refs. 43, p. 5; 53, p. 177). 1,1-DCE has been detected in the contaminated soil source and in ground water underlying and downgradient of the source (see sections 2.2.2 Hazardous Substances Associated with the Source and 3.1.1 Observed Release of this HRS documentation record). PREVIOUS INVESTIGATIONS The majority of investigations which include the General Dynamics property have been performed in conjunction with the SEC property. As a result of contaminant delineation efforts, many of the sampling investigations have included the General Dynamics property (Ref. 8, pp. 4-4 through 4-15). As a result of a former employee's allegation that SEC disposed solvents into the septic system located on the SEC property, FDEP's (then known as Florida Department of Environmental Regulation, henceforth referred to as FDEP) Operations Response Team conducted a preliminary ground water investigation at SEC in July and October 1984. Six shallow sandpoint well ground water samples were collected and analyzed for volatile organic compounds (VOC) (Ref. 22, pp. 3, 6; 26, p. 3). No VOCs were detected in an upgradient designated background sample. One or more of the following compounds were detected in the downgradient sandpoint wells: chloroethane, 1,1-dichloroethane (DCA), 1,1-DCE, 1,2-DCE, 1,1,1- TCA, and TCE (Ref. 22, p. 9). In October 1985, E.C. Jordan conducted a preliminary assessment (PA) on behalf of FDEP. The PA noted that FDEP had issued a Warning Notice to SEC on January 11, 1985, regarding the high concentration of TCE, 1,1-DCE, and TCE in the ground water underlying the SEC property. During a windshield survey conducted on August 22, 1985, effluent was seen flowing from a polyvinyl chloride (PVC) pipe into the drainage ditch located on the SEC property. It was recommended that the facility be inspected to ensure that illegal discharges to the septic system were no longer occurring and to sample the discharge to the ditch to ensure that it was not negatively impacting surface water quality (Ref. 23, pp. 1, 2). FDEP issued a consent order (CO) on January 9, 1986 (Ref. 24, Appendix A, p. 1). On February 10, 1986, SEC submitted a preliminary contamination assessment plan (PCAP) to FDEP; the plan was approved by FDEP on April 23, 1986 (Ref. 24, Appendix A, p. 2). During the PCAP review period, SEC located an underground storage tank (UST) on the southern portion of the property, and analyzed its contents (Ref. 25, p. 1, Figure 1). The UST contained the following VOCs: 1,1-DCA; 1,1-DCE; 1,1,1- TCA; and TCE (Ref. 25, pp. 11, B-l). In May 1986, sixteen ground water samples were collected on the SEC property. The following hazardous substances were detected in the ground water samples collected: 1,1-DCA; 1,1-DCE; cis-1,2-DCE; methylene chloride; PCE; 1,1,1-TCA; and TCE (Ref. 25, pp. 3, 4, 10). The greatest concentrations of total VOCs, 6,617 milligrams per liter (mg/L), were detected in the north central portion of the SEC property. No samples were collected on the General Dynamics property (Ref. 25, pp. 9, 10). The UST and underlying contaminated soil (from ground surface to 10 feet below land surface [bis]) were removed in 1987, and the excavation was filled with soil transported from off site. Approximately 5,500 pounds of soil were removed from the property (Ref. 24, pp. 2, 3, 104 through 107). Geraghty & Miller, Inc. collected ground water samples from newly installed monitoring wells in 1988 and 1989 (Ref. 6, pp. 1, 5, 7, 8). Three monitoring wells were installed on the General Dynamics property, MW-13, MW-14, and FL-3, with total depths of 40, 15, and 156 feet, respectively. These wells are located on the eastern portion of the General Dynamics property (Refs. 6, Figures 8, 9, and 10; 71, pp. 18, 19, 33). The greatest concentrations of TCE discovered in monitoring wells were detected in sample MW-5 (total depth of 44 feet bis) in August 1988 and again in November 1989. MW-5 is located on the north central portion of the SEC property (Refs. 6, Tables 6 and 7, Figure 6; 71, p. 10). 17 ------- In March 1991, Geraghty & Miller installed two wells on the western portion of the General Dynamics property (Refs. 27, p. i, Figure 1; 71, pp. 21, 34). Monitoring well MW-16 (MW-16A) was installed to a depth of 16 feet bis and FL-4 (FL-4C) was installed to a depth of 130 feet bis (Refs. 8, Table 2-4; 71, pp. 21, 34). Samples collected in March 1991 from monitoring well MW-16 (MW-16A) contained TCE at a concentration of 380 (ig/L. Constituents related to the General Dynamics and/or SEC properties were not detected in the sample collected from FL-4 (Ref. 27, Attachment A, pp. 3, 5). In October 1995, Great American Financial Resources, Inc. (GAFRI) (successor in interest to SEC) retained Woodward-Clyde Consultants (now URS Corporation [URS]) to conduct remediation activities at the SEC property (Ref. 8, pp. ES-1, 4-8). In January 1996, URS submitted a revised interim remedial action plan to FDEP. Three horizontal wells were installed in the upper surficial aquifer along the north boundary of the SEC property to capture impacted shallow ground water and prevent the movement of the shallow volatile organic hydrocarbon (VOH) plume to the north (Ref. 8, p. 4-8). One recovery well was installed in the lower surficial aquifer to provide some hydraulic control, recover contaminants from the B-zone (lower surficial aquifer), and to create additional upward pressure to further reduce the possibility of vertical migration of contaminants into the Floridan aquifer (Ref. 8, pp. 1-9, 4-8). The ground water treatment system began operation in July 1997. Six additional A-zone (upper surficial aquifer) wells, one B-zone well, and one Floridan aquifer well were installed in 1996 to support performance monitoring (Ref. 8, pp. 1-9, 4-8). In 2001, URS, on behalf of GAFRI, conducted additional contamination assessment activities at the SEC and General Dynamics properties (Refs. 8, pp. 4-10, 7-2; 8a; 46, p. 1; 79). The additional assessment activities were conducted to investigate the cause of increasing levels of halogenated compounds in the A-zone (about 12 to 17 feet bis) and the B-zone (about 20 to 46 feet bis) of the surficial aquifer (Ref. 46, p. 1, Figure 3). Field logbooks from these activities are presented in Reference 93. The "A" zone and "B" zone are separated by a clay layer (A/B) that exists at depths ranging from 11 feet to 32 feet bis across the SEC and General Dynamics properties; however, the A/B clay layer is absent in certain areas of both properties (Ref. 8, p. 2-4, Figure 2-3). Soil and direct push ground water samples were collected during the investigation and analyzed for eight halogenated compounds (Ref. 46, p. 1; 58). TCE and its degradation products were detected in subsurface soil samples collected from the western section of the General Dynamics property (Ref. 46, Table 1, Figure 1; Ref. 52. p. 24; 65). In November 2003, URS conducted a supplemental site investigation at the General Dynamics and SEC properties (Ref. 73, pp. Cover-1, 1-1). URS investigated the septic tanks in the areas west of Buildings 1 and 2 on the General Dynamics property (Ref. 73, p. 2-1). In 2005, URS, on behalf of GAFRI, conducted preliminary site characterization activities at the SEC and General Dynamics properties. Activities included the collection of soil samples, direct push ground water sampling, monitoring well network installation and sampling, as well as septic tank sampling (Refs. 54; 57; 75; 80; 82; 90). All samples were analyzed for chlorinated solvents (Ref. 49, pp. 1 through 4; 66; 81; 83; 84; 85; 86; 91). A soil sample was collected in the vicinity of the former vapor degreaser at a depth of 3 feet bis on the General Dynamics property (Refs. 16, pp. 14, 15, Exhibit 1; 49, Figure 3). This sample contained 1,1-DCE at a concentration of 19.2 jj.g/kg. PCE was also detected in the soil sample, but at a concentration greater than the method detection limit but less than the reporting limit (Refs. 49, Table 1; 77, p. 15). Ground water sampled from a direct-push sampling location underlying and downgradient of the contaminated soil contained a significant increase of 1,1-DCE (greater than 3 times background) (See Section 3.1, Likelihood of Release, of this HRS documentation record). In 2007, MACTEC conducted a site inspection (SI) at the General Dynamics property on behalf of FDEP. SI activities included the collection of soil and ground water samples from eight areas of concern to identify possible source areas on the General Dynamics property (Ref. 10, pp. 19, 20, 21, 22). The samples were analyzed for VOCs and Resource Conservation and Recovery Act (RCRA) metals (Ref. 10, p. 20). Surface and subsurface soil samples collected in the vicinity of the paint and plating building contained cadmium, chromium, lead, and silver at elevated concentrations (Refs. 3; 10, p. 53, Tables 7 and 9). Surface and subsurface soil samples did not contain site-related organic hazardous substances 18 ------- (Ref. 10, p. 52, Tables 6 and 8). One ground water sample collected in the vicinity of the paint and plating building contained chromium at 52 (ig/L (Ref. 10, p. 51, Table 11). Ground water samples were collected from direct push sample locations and newly installed micro wells located near Source 2 (DPGW03, MW-AOC-1, MW-AOC-A2) at depths ranging from 10 to 42 feet bis (Ref. 10, pp. 21, 22, 56, Tables 3 and 4). The samples contained PCE, TCE, cis-l,2-DCE, 1,1-DCE, and vinyl chloride (Ref. 10, p. 56, Table 10). The concentrations of PCE, TCE, 1,1-DCE, and vinyl chloride detected in the samples exceeded their respective EPA MCLs (Refs. 10, p. 56, Table 10; 48, pp. 2, 4, 5). The greatest concentration of 1,1-DCE was detected at a depth of 20 to 24 feet bis with concentrations of 3,400 (ig/L. The greatest concentration of TCE, 8.2 (ig/L, was detected at a depth of 38 to 42 feet bis, and the greatest concentration of vinyl chloride, 8.5 (ig/L, was detected at a depth of 15 to 25 feet bis (Ref. 10, p. 56, Table 10). 19 ------- Source No: 2 2.2 SOURCE CHARACTERIZATION 2.2.1 SOURCE IDENTIFICATION Number of source: 2 Name of source: Contaminated soil in the southeastern corner of Building 3 Source Type: Contaminated soil Description and Location of Source (with reference to a map of site): Source No. 2 is contaminated soil containing 1,1-DCE located beneath the southeastern corner of Building 3 (see Figure 2 of this HRS documentation record). In 2005, URS collected a subsurface soil sample (SB-038-03) in the southeast corner of Building 3 (Ref. 80, p. 29; 49, Figure 3). The sample contained 1,1-DCE at an elevated concentration (Ref. 77, p. 15) (see Table 3 of this HRS documentation record). 1,1-DCE is a breakdown product of 1,1,1-TCA and TCE (Ref. 52, p. 24, B4-63). Solvents such as 1,1,1-TCA and TCE are indicated to have been used at the General Dynamics facility (Ref. 41, pp. 11, 12, 13; 88, pp. 7 through 11, 14, 15). Solvents were stored in an above ground storage tank located outside Building 3, and used in a vapor degreaser located near Source No. 2 (Ref. 41, pp. 11, 12, 13; 88, pp. 7 through 11, 14, 15). Additionally, an underground storage tank is located near Source 2 (Ref. 8, pp. 1-4, 2-2, Figure 1-2) 20 Source Characterization ------- Source No: 2 2.2.2 HAZARDOUS SUBSTANCES ASSOCIATED WITH THE SOURCE The subsurface soil samples listed in Table 3 were collected by URS during the June through September 2005 RI (Refs. 8, p. 2-5; 50, p. 44; 75, pp. 13, 20; 76, p. 46; 77, p. 34; 80, pp. 27, 29; 92, p. 43). The subsurface soil samples were collected at 3 feet bis. Subsurface soil samples, SB-006-3, SB-017-3, and SB-037-3, were collected from the General Dynamics and SEC properties at the same depth (3 feet bis) and were used to establish background concentrations (Refs. 49, Figure 3; 75, pp. 13, 20; 80, pp. 27, 29). The contaminated subsurface soil sample, SB-038-03, was collected in the southeastern corner of Building 3 at a depth of 3 feet below the building floor. The sample was collected inside the building by coring through the concrete using a direct push rig. (Refs. 16, pp. 14, 15, Exhibit 1; 49, Figure 3; 80, pp. 29, 30). The background subsurface soil samples and contaminated subsurface soil samples were collected from the same soil type (urban land, 0 to 12 percent slopes), at the same depth, during the same sampling event, and in accordance with the same sampling procedures (Refs. 7; 8, p. 2-5; 49, Figure 3; 55, pp. 167, 168, 169; 74, Appendix E, p. E-30; 75, pp. 13, 20; 80, pp. 27, 29; 87, Section 12). The subsurface soil samples were collected in accordance with the EPA Region 4, Science and Ecosystem Support Division (SESD) Environmental Investigations Standard Operating Procedures and Quality Assurance Manual (EISOPQAM) (Refs. 7; 8, pp. 2-5; 74, Appendix E, p. E-30; 87, Section 12). The samples were analyzed for VOHs (volatile organic hydrocarbons) using EPA SW846 Method 8260B (Refs. 8, p. 2-5; 50, p. 7; 59, p. 1, FOUR-15; 76, p. 13; 77, p. 15; 92, p. 18). Data validation was conducted by URS and the data validation reports are contained in Reference 51. The URS data validation reports were reviewed to ensure that the National Functional Guidelines were followed. Analytical data sheets and chain of custody records are contained in References 50, 76, 77, and 92. Logbook notes are provided in References 75 and 80. The locations of the subsurface soil samples listed in Table 3 are provided in Figure 3 of Reference 49. TABLE 3: Analytical I results for Source No. 2 - June through September 2005 Sample ID /Station ID Hazardous Substance Hazardous Substance Concentration MDL References Background Subsurface Soil Sample SB-006-3 1,1-DCE 4.5U Mg/kg 4.5 (ig/kg 28, pp. 1-3; 50, pp. 7, 44; 51, pp. 57 through 61; 75, p. 13 SB-017-3 1,1-DCE 4.7U Mg/kg 4.7 (ig/kg 28, pp. 1-3; 51, pp. 62 through 66; 75, p. 20; 76, pp. 13,46 SB-037-3 1,1-DCE 3.2U Mg/kg 3.2 (ig/kg 28, pp. 1-3; 51, pp. 47 through 51; 80, p. 27; 92, pp. 18, 43 Contaminated Subsurface Soil Sample SB-038-03 1,1-DCE 19.2 (ig/kg 2.5 (ig/kg 28, pp. 1-3; 77, pp. 15, 34; 51, pp. 2 through 6; 80, p. 29 Notes: 1,1-DCE 1,1-Dichloroethlyene ID Identification number (ig/kg Microgram per kilogram MDL Method detection limit SB Subsurface soil sample U Material not detected at or above reporting limit 21 Source Characterization ------- Source No: 2 2.2.3 HAZARDOUS SUBSTANCES AVAILABLE TO A PATHWAY The subsurface soil sample collected from Source No. 2 contained an elevated concentration of 1,1-DCE (Refs. 49, Figure 3; 77, pp. 15, 34) (also see Table 5 of this HRS documentation record). Source No. 2 consists of an area of contaminated soil located in the southeastern portion of Building 3 on the General Dynamics property (Ref. 16, pp. 14, 15, Exhibit 1). Analytical results for ground water collected in the vicinity of Source No. 2 indicate that a release of hazardous substances has occurred to the ground water migration pathway as documented in Section 3.0 of this HRS documentation record. During the 2005 RI, a liner was not observed during sampling activities (Ref. 56). Therefore, a containment factor value of 10 was assigned for the ground water migration pathway (Ref. 1, Section 3.1.2.1, Table 3-2). TABLE 4: Containment Factors for Source No. 2 Containment Description Containment Factor Value References Gas release to air NS NA Particulate release to air NS NA Release to ground water: No liner 10 1, Section 3.1.2.1, Table 3-2; 56 Release via overland migration and/or flood NS NA Notes: NA Not applicable NS Not scored 22 Source Characterization ------- Source No: 2 2.4.2.1 HAZARDOUS WASTE QUANTITY 2.4.2.1.1 Hazardous Constituent Quantity The information available is not sufficient to evaluate Tier A, hazardous constituent quantity, as required by Reference 1, Section 2.4.2.1.1. Hazardous Constituent Quantity Assigned Value: NS 2.4.2.1.2 Hazardous Wastestream Quantity The information available is not sufficient to evaluate Tier B, hazardous wastestream quantity, as required by Reference 1, Section 2.4.2.1.2. Hazardous Wastestream Quantity Assigned Value: NS 2.4.2.1.3 Volume The information available is not sufficient to evaluate Tier C, hazardous volume quantity, as required by Reference 1, Section 2.4.2.1.3. Volume Assigned Value: 0 2.4.2.1.4 Area Only one sample was collected from Source No. 2 in the vicinity of the former vapor degreaser (Refs. 16, pp. 14, 15, Exhibit 1; 49, Figure 3). As a result, it is not known whether contamination in Source No. 2 is continuous throughout and the extent of contamination is not defined. The area of Source No. 2 is undetermined, but greater than zero (Ref. 1, Section 2.4.2.1.4). Sum (ft2): >0 Equation for Assigning Value (Table 2-5): Area (A)/34,000 Area Assigned Value: >0 2.4.2.1.5 Source Hazardous Waste Quantity Value The source hazardous waste quantity (HWQ) value for Source No. 2 is assigned a source HWQ value of greater than zero, but unknown (Ref. 1, Sec. 2.4.2.1.5). Source HWQ Value: >0 23 Source Characterization ------- SUMMARY OF SOURCE DESCRIPTIONS TABLE 5: Summary of Source Descriptions Source No. Source Hazardous Waste Quantity Value Source Hazardous Constituent Quantity Complete? (Yes/No) Containment Factor Value by Pathway Ground Water (Ref. 1, Table 3-2) Surface Water Overland/ Flood (Ref. 1, Table 4-2) Air Gas (Ref. 1, Table 6-3) Particulate (Ref. 1, Table 6-9) 2 >0 No 10 NS NS NS Notes: > Greater than NS Not scored Description of Other Possible Sources During the 2007 SI conducted by MACTEC, surface and subsurface soil samples were collected from various locations throughout the property surrounding the paint and plating building located in the northeastern portion of the property (Refs. 3; 10, pp. 1, 3, 51, 52, 53, Tables 3, 7, and 9) (see Figure 2 of this HRS documentation record). Sediment samples have also been collected from the drainage ditch that runs between the General Dynamics and SEC properties and were found to contain TCE and DCE (Ref. 8, Tables 4-1 and 4-2, Figure 2-2). Surface and subsurface soil samples collected during the SI contained cadmium, chromium, lead, and silver at elevated concentrations (Ref. 10, pp. 52, 53, Tables 7 and 9). One ground water sample collected in the vicinity of the paint and plating building contained chromium at 52 jig/L (Ref. 10, p. 51, Table 11). 24 Source Characterization ------- 3.0 GROUND WATER MIGRATION PATHWAY 3.0.1 GENERAL CONSIDERATIONS Ground Water Migration Pathway Description The General Dynamics property is located in the western section of Seminole County on the Florida Platform section of the Atlantic Coastal Plain province (Refs. 4, p. 3; 10, p. 48; 67, pp. 2, 3; 69, p. 4). The topography in Seminole County is divided into two types: a flat lowland and hilly uplands (Refs. 68, p. 6; 70, pp. 6, 7). Elevation at the General Dynamics property is about 35 feet above sea level (asl) (see Figure 1 of this HRS documentation record) (Ref. 30). The General Dynamics property is underlain in descending stratigraphic order by undifferentiated deposits of the Holocene, Pleistocene, and Pliocene age; the Hawthorn Group of the Miocene age; the Ocala Limestone, Avon Park Formation, and Oldsmar Formation of the Eocene age; and the Cedar Keys Formation of the Paleocene age (Ref. 68, pp. 10, 13). The undifferentiated deposits of Pliocene to Holocene age consist of alluvium, freshwater marl, peats and muds in stream and lake bottoms, quartz, sand, shell fragments and sandy clay. The deposits range from 0 to 150 feet bis in the vicinity of the General Dynamics property (Ref. 68, p. 13). Underlying the undifferentiated deposits is the Hawthorn Group. The Hawthorn Group consists of beds of blue to gray, calcareous clay, altering with beds of cream to gray sandy limestone containing numerous grains of black to cream phosphate rack and fragments of chert. The deposits range from 0 to 200 feet in thickness (Refs. 68, p. 13; 70, p. 15). The Ocala Limestone underlies the Hawthorn Group and is characterized by white-cream to tan-gray soft to hard, granular, porous foraminiferal marine limestones (Refs. 68, p. 13; 70, p. 15). The Ocala Limestone is about 0 to 200 feet thick and overlies the Avon Park Formation, which consists of light to brown, soft to hard, porous to dense, granular to chalky, fossiliferous limestone and brown, crystalline dolomite (Refs. 68, p. 13; 70, pp. 13, 14). The Avon Park Formation is about 600 to 1,600 feet thick. Underlying the Avon Park Formation is the Oldsmar Formation which has a thickness of 300 to 1,350 feet. This formation consists of alternating beds of light brown to white, chalky, porous, fossiliferous limestone and porous crystalline dolomite. The Avon Park Formation is underlain by the Cedar Keys Formation, which consists of dolomite with anhydrite and gypsum and some limestone. The Cedar Keys formation is about 500 to 2,200 feet thick (Ref. 68, p. 13). Ground water in the Seminole County, Florida area exists in two distinct units: the surficial aquifer and the Floridan aquifer. These aquifers are separated by a discontinuous intermediate confining unit (Hawthorn Group). The surficial aquifer has limited use due to low yields to wells and the potential for contamination. Water withdrawn from the surficial aquifer is used mainly for lawn irrigation (Refs. 8, Figure 4-40; 29; 68, pp. 2, 13; 71, p. 32). The Floridan aquifer system is the principal source of ground water in east-central Florida and is divided into two aquifers of relatively high permeability, the Upper Floridan and the Lower Floridan aquifers. These aquifers are separated by a less permeable unit that restricts the downward movement of water (Ref. 68, p. 19). The surficial aquifer consists of undifferentiated sediments of the Holocene, Pleistocene, and Pliocene ages; the intermediate confining unit consists of part of the Hawthorn Group; and the Floridan aquifer consists of portions of the Hawthorn Group, Ocala Limestone, the Avon Park Formation, the Oldsmar Formation, and the upper part of the Cedar Keys Formation (Ref. 68, pp. 13, 19). In Seminole County, the surficial aquifer is separated from the Floridan aquifer by the confining bed of the Hawthorn Group; however, the Hawthorn Group is not continuous; and is not present directly north (about 240 feet) of the General Dynamics property (Refs. 8, Figure 4-40; 29; 71, p. 32). The surficial aquifer is the upper most water bearing unit in Seminole County. The system is unconfined and consists mainly of lenses of fine to medium quartz sand with varying amounts of shell and clay. The deposits are discontinuous and their lithology and texture can vary over short distances. The top of the 25 GW-Likelihood of Release ------- surficial aquifer is defined by the water table (Ref. 68, p. 14). The base of the surficial aquifer system is characterized by the first persistent beds of Miocene or Pliocene age containing a significant increase in clay or silt. The altitude at the base of the surficial aquifer system ranges from about 75 feet asl to more than 75 feet below sea level in Seminole County (Ref. 68, p. 16). Underlying the surficial aquifer is the intermediate confining unit (Hawthorn Group) containing interbedded quartz, locally highly phosphatic clay, silt, sand, and limestone (Ref. 68, pp. 13, 18). The thickness of the confining unit is variable due to past erosional processes and sinkhole formation. In Seminole County, the thickness of the Hawthorne Group ranges from 25 to greater than 100 feet (Ref. 68, p. 18). However, the Hawthorn Group is not continuous in the vicinity of the General Dynamics property. Specifically, the group is absent directly north (about 240 feet) of Source No. 2 on the General Dynamics property; therefore, the surficial and Upper Floridan aquifers are interconnected (Refs. 8, Figure 4-40; 29; 71, p. 32). The Upper Floridan aquifer is composed of the Ocala Limestone and the dolomitic limestones of the upper one-third of the Avon Park Formation (Ref. 68, p. 19). In the vicinity of the General Dynamics property, the top of the Upper Floridan aquifer is encountered at about 50 feet below sea level (about 85 feet bis) (Refs. 30; 68, p. 22). However, according to the U.S. Geological Survey (USGS) well data- collection sites, the depths of wells installed in the Upper Floridan aquifer in Seminole County range from 90 to 925 feet bis. (Refs. 9, Plates 28 and 29; 30; 68, pp. 102 through 107). Also, the depths of municipal wells installed in the Upper Floridan aquifer in Seminole County range from 162 to 925 feet bis (Refs. 31, pp. 1,2; 32, p.l; 33, pp. 1,2; 34; 35, pp. 1, 22; 36, p.l; 37, p. 1; 61; 62, p. 2; 63; 94; 97) (see Table 17 of this HRS documentation record). Well logs of monitoring wells installed in the Upper Floridan aquifer on the SEC and General Dynamics properties display water levels indicating that ground water flow is to the north-northeast (Ref. 8, p. 3-4, Figure 3-10). Ground water flow in the Upper Floridan aquifer system is mostly through porous limestone, and is enhanced by networks of small fractures or solution openings that occur along joints or bedding planes. In some areas, flow may be through large cavernous features of paleokarst, resulting in a dual-porosity flow system (Ref. 68, pp. 19, 21, 23). In addition, Florida Geological Survey well logs to the north and south of the General Dynamics property indicate pin point voids in the limestone units of the Upper Floridan aquifer. Karstic ground water flow occurs in the Upper Floridan aquifer (Refs. 64, pp. 4, 14; 78). Recharge in the Upper Floridan aquifer is by downward leakage from the surficial aquifer system, through breaches in the intermediate confining unit caused by sinkholes or where the confining unit is thin or missing, by lateral inflow, and through drainage wells (Ref. 68, p. 29). The highest rates of recharge from the surficial aquifer to the Upper Floridan aquifer occur in western Seminole County, which is characterized by karstic sand ridges with relatively deep water tables or an intermediate confining unit that is relatively thin (Ref. 68, p. 29). Karst terrain is also exhibited in Longwood, Florida by numerous sinkholes of various sizes (Refs. 78; 95, pp. 1 through 6). The middle semiconfining unit separates the Upper and Lower Floridan aquifers and consists of soft micritic limestone and fine-grained dolomitic limestone, both of low porosity (Refs. 9, p. B56; 68, p. 23). The middle semiconfining unit is the leakiest confining unit in the Floridan aquifer system (Ref. 9, pp. B3, B56). In Seminole County the middle semiconfining unit ranges in thickness from about 400 to 550 feet (Refs. 9, p. B57; 68, p. 23). The Lower Floridan aquifer includes the lower one-third of the Avon Park Formation and all of the Oldsmar Formation. The aquifer is very productive and is composed of altering beds of limestone and fractured dolomite (Ref. 68, p. 23). The top of the Lower Floridan aquifer is encountered at about 900 to 1,000 feet below sea level (which corresponds to about 935 to 1,035 feet bis at the site) (Refs. 30; 98, pp. 20, 21; 99, pp. 1, 5, 6). The Lower Floridan aquifer is about 910 to 1,180 feet thick. Therefore, the base of the Lower Floridan Aquifer is estimated to be between 1,810 and 2,180 feet below sea level (which corresponds to about 1,845 to 2,215 feet bis at the site) (Refs. 9, Plates 31 and 33; 30; 98, pp. 20 through 26 GW-Likelihood of Release ------- 23). According to USGS well data-collection sites, the depths of wells installed in the Lower Floridan aquifer in Seminole County range from 984 to 1,506 feet bis (Ref. 68, pp. 102 through 107). Previous investigations at the General Dynamics and SEC properties divide the surficial aquifer into two water bearing zones, A-zone and B-zone, and refer to the Upper Floridan aquifer as the C-zone. The A- zone (upper surficial aquifer) and B-zone (lower surficial aquifer), are separated by a discontinuous clay layer (A/B clay) (Ref. 8, pp. 3-3, 3-4, Figure 2-3). The A/B clay layer ranges in depth from 13.5 bis to 32 feet bis across the General Dynamics property and is absent in the northwestern portion of the property (Ref. 8, p. 2-4, Figure 2-3, Appendix C, pp. 27 through 49). The ground water flow direction in the A and B zones is north to northeast across the General Dynamics property (Refs. 8, Figures 3-6 and 3-7; 10, p. 57). Three horizontal wells were installed in the upper surficial aquifer along the north boundary of the SEC property to capture impacted shallow ground water and prevent the movement of the shallow volatile organic hydrocarbon (VOH) plume to the north (Ref. 8, p. 4-8; 74, Appendix H, Figure 2, Figure 4). One recovery well was installed in the lower surficial aquifer to provide some hydraulic control, recover contaminants from the B-zone (lower surficial aquifer), and to create additional upward pressure to further reduce the possibility of vertical migration of contaminants into the Floridan aquifer (Ref. 8, pp. 1- 9, 4-8). The operation of this system does not alter the general northerly movement of ground water in the surficial aquifer (Ref. 8, Figs. 3-6, 3-7, Appendix D, p. D-105; 10, Fig. 10; 74, Appendix H, Figs. 4, 5). SUMMARY OF AQUIFERS BEING EVALUATED TABLE 6: Summary of Aquifers Being Evaluated Aquifer Name Is Aquifer Interconnected with Upper Aquifer within 2 Miles? (Yes/No/NA) Is Aquifer Continuous within 4-mile TDL? (Yes/No) Is Aquifer Karst? (Yes/No) References Surficial Aquifer NA Yes No 78, p. 3 Upper Floridan Aquifer Yes Yes Yes 29; 78, p. 1 Notes: NA Not applicable TDL Target distance limit 27 GW-Likelihood of Release ------- 3.1 LIKELIHOOD OF RELEASE 3.1.1 OBSERVED RELEASE Aquifer Being Evaluated: Interconnected Surficial and Upper Floridan Aquifer - Hazardous Substance in Release: 1,1-DCE Chemical Analysis Analysis of ground water underlying and downgradient of Source No. 2 shows a significant increase of 1,1-DCE (greater than 3 times) over background level (see Table 12 and 14 of this HRS documentation record). Background Samples Direct push ground water samples collected from direct push locations 23 and 26 (DPGW-23 and DPGW- 26) were collected on the northeastern and south central portion of the SEC property. These locations are upgradient of Source No. 2 and ground water underlying Source No. 2 (Ref. 8, Figures 3-6 and 3-7) (see Figure 2 of this HRS documentation record). Therefore, ground water samples collected from DPGW-23 and DPGW-26 are used to represent background concentrations for the observed release to the surficial aquifer underlying and downgradient of Source No. 2 at the General Dynamics property (Refs. 8, Figures 4-30 and 4-32; 72, p. 74; 75, pp. 55, 56). Background direct push ground water samples listed in Table 11 were collected at 22 feet bis and are compared to downgradient direct push ground water samples collected at corresponding depths (Ref. 8, Figures 4-30 and 4-32) (see Tables 11 and 13 of this HRS documentation record). The direct push ground water samples were collected using a truck-mounted direct push rig and smaller track mounted direct push rig to advance stainless steel rods using hydraulic pressure and a hammer technique (Ref. 8, p. 2-7). The background direct push ground water samples were collected in accordance with the EPA Region 4 SESD EISOPQAM, dated November 2001 (Refs. 7; 74, Appendix E, p. E-29; 87, Section 7). The locations of the direct push background ground water samples are provided in Table 11 and depicted in Reference 8, Figures 4-29 through 4-32. Chain of custody records are provided in Reference 72, pp. 74, 76. Logbook notes are contained in Reference 75. The background direct push and downgradient direct push ground water samples were collected from surficial aquifer wells with similar construction details, at similar depths, during the same sampling event, and in accordance with the same sampling procedures (Refs. 7; 8, p. 2-7; 72, pp. 74, 76; 74, Appendix E, p. E-29; 77, p. 34; 80, p. 29; 87, Section 7) (see Tables 11 and 13 of this HRS documentation record). TABLE 11: Background for June through September 2005 Sample ID Depth (feet bis) Screened Interval (feet bis) Date Sampled Location References Background Samples for Ground Water Underlying and Downgradient of Source No. 2 Direct Push Ground Water Sample Collected at 22 Feet bis DPGW-23(22') 22 NA 6/21/2005 Northeastern portion of SEC property 8, Figure 4-30; 75, pp. 55, 56; 72, p. 76 DPGW-26(22') 22 NA 6/21/2005 South central portion of SEC property 8, Figure 4-30; 72, p. 74 28 GW-Likelihood of Release ------- Notes: bis Below land surface DP Direct push GW Ground water ID Identification NA Not applicable No. Number t Feet (#) Depth of direct push ground water sample in feet 29 GW-Likelihood of Release ------- Background Level The ground water samples listed in Table 12 were collected by URS during the 2005 RI (Refs. 8, Figures 4-30; 72, pp. 74, 76; 75, pp. 55, 56). These direct push samples were analyzed for VOHs using EPA SW846 Method 8260B (Refs. 8, pp. 4-12; 59, p. 1, FOUR-15; 72, pp. 33, 65). As seen in Table 12 below, 9.2 (ig/L was the highest background concentration of 1,1-DCE, and is used as the background level for this evaluation. Data validation was conducted by URS and the data validation reports are contained in Reference 51. The data validation reports were reviewed to ensure that the National Functional Guidelines were followed (Ref. 28, pp. 1, 2, 3). Method detection limits, reporting limits, and analytical data sheets for the background ground water samples are contained in Reference 72. TABLE 12: Analytical Results for June through September 2005 RI Sample ID Hazardous Substance Concentration RL References Background Samples For Ground Water Underlying and Downgradient of Source No. 2 Direct Push Ground Water Sample Collected at 22 Feet bis DPGW-23(22') 1,1-DCE 9.2 (ig/L 0.50 (ig/L 28, p. 1; 51, pp. 7 through 11; 72, p. 33 DPGW-26(22') 1,1-DCE 0.50U (ig/L 0.50 (ig/L 28, p. 1; 51, pp. 7 through 11; 72, p. 65 Notes: DCE Dichloroethylene DP Direct push ID Identification number GW Ground water MDL Method detection limit l-ig/L Microgram per liter No. Number RI Remedial Investigation RL Reporting limit U Analyte was not detected at or above the detection limit t Feet (#) Depth of direct push ground water sample in feet 30 GW-Likelihood of Release ------- Contaminated Sample The contaminated direct push samples listed in Table 13 were collected from direct push borings during the 2005 RI conducted by URS (Refs. 8, pp. 2-7). The contaminated ground water sample was collected from ground water underlying and downgradient of Source No. 2 (Refs. 8, pp. 4-12, Figures 4-29 through 4-32; 77, p. 34; 80, p. 29) (see Figure 2 of this HRS documentation record). The contaminated ground water sample and its corresponding depth is provided in Table 13. The contaminated ground water sample underlying and downgradient of Source No. 2 was compared to upgradient ground water samples at corresponding depths (Ref. 8, Figures 4-29 through 4-32) (see Tables 11 and 13 of the HRS documentation record). The direct push ground water samples were collected using a truck-mounted direct push rig and smaller track mounted direct push rig to advance stainless steel rods using hydraulic pressure and a hammer technique (Ref. 8, p. 2-7). The contaminated ground water sample was collected in accordance with the EPA Region 4 SESD EISOPQAM, dated November 2001 (Refs. 7; 74, Appendix E, p. E-29; 87, Section 7). The location of the ground water sample listed in Table 13 is depicted on Figures 4-30 in Reference 8. Chain of custody records are provided in References 72 and 77. Logbook notes are provided in Reference 80. TABLE 13: June through September 2005 RI Sample ID Depth (feet bis) Screened Interval (feet bis) Date Sampled Location References Ground Water Underlying or Downgradient of Source No. 2 Direct Push Ground Water Samples Collected at 22 Feet bis DPGW-34(22') 22 NA 9/16/2005 Southeastern Corner of Building No. 3 on General Dynamics property 3; 8, Figure 4-30; 77, p. 34; 80, p. 29 Notes: bis Below land surface DP Direct push GW Ground water ID Identification NA Not applicable No. Number ' Feet (#) Depth of direct push ground water sample in feet 31 GW-Likelihood of Release ------- Contaminated Concentration The direct push ground water sample listed in Table 14 was collected from the General Dynamics property during the June through September 2005 RI conducted by URS (Refs. 8, pp. 4-12, Figures 4-29 through 4-32; 72, p. 75; 77, p. 34; 80, p. 29). The direct push sample presented in Table 14 was analyzed for VOH analysis using EPA SW846 Method 8260B (Refs. 8, p. 4-12; 59, p. 1, FOUR-15; 77, pp. 9, 10). Data validation was conducted by URS and the data validation reports are contained in Reference 51. The URS data validation reports were reviewed to ensure that the National Functional Guidelines were followed (Ref. 28, pp. 1, 2, 3). The method detection limits and reporting limits are contained on the analytical data sheets in Reference 77. TABLE 14: Analytical Results for June through September 2005 RI Sample ID Hazardous Substance Concentration RL References Ground Water Underlying and Downgradient of Source No. 2 Direct Push Ground Water Samples Collected at 22 Feet bis DPGW-34(22') 1,1-DCE 26,500a (ig/L 500 |_ig/L 28, pp. 1-3; 51, pp. 2 through 6; 77, pp. 9, 10 Notes: a Result is from Run# 2 DCE Dichloroethylene DP Direct push (ig/L Microgram per liter MDL Method detection limit RL Reporting limit ' Feet (#) Depth of direct push ground water sample in feet 32 GW-Likelihood of Release ------- Attribution The significant increase of 1,1-DCE can be attributed to the General Dynamics Longwood site. 1,1-DCE is associated with Source No. 2, and a significant increase of 1,1-DCE is detected in ground water underlying and downgradient of Source No. 2 (see sections 2.2.2 Hazardous Substances Associated with the Source and 3.1.1 Observed Release of this HRS documentation record). Additionally, upgradient background concentrations of 1,1-DCE indicate that releases from the SEC SAA site did not contribute significantly to the increase in the concentration of 1,1-DCE in the General Dynamics Longwood site observed release sample (see section 3.1.1 Observed Release of this HRS documentation record). According to depositions of former General Dynamics' employees, General Dynamics (and its predecessors) manufactured printed circuit boards (Refs. 10, pp. 3, 4; 16, pp. 6, 7). Gould Publications purchased the property in 1993 and conducted printing and publication assembly operations. Currently, the property is used for wholesaling and warehouse activities (Refs. 10, p. 3; 18). Solvents such as 1,1,1- TCA and TCE (whose degradation products include 1,1-DCE) are indicated to have been used at the General Dynamics facility (Ref. 41, pp. 11, 12, 13; 52, p. 24, B4-63; 88, pp. 7 through 11, 14, 15). Solvents were stored in an above ground storage tank located outside Building 3, and used in a vapor degreaser located near Source No. 2 (Ref. 41, pp. 11, 12, 13; 88, pp. 7 through 11, 14, 15). The adjacent SEC facility manufactured film capacitors on the property from 1959 to 1992. From about 1959 to December 1964, a portion of the SEC property was owned by Dearborn. Both SEC and Dearborn manufactured film capacitors at the SEC property. Film capacitors were assembled, soldered, impregnated with wax mineral oil or silicon oil in a pressurized chamber, and then cleaned in a vapor degreaser (Ref. 26, p. 3). The chemicals TCA and TCE were used as cleaning agents in the vapor degreaser, and contamination has been documented in SEC sources and ground water in the surficial and Floridan aquifers underlying the SEC property (Refs. 5, pp. 15, 18; 8, p. 1-5; 22, p. 3; 60). In January 1986 and December 1987, the SEC property entered into a State of Florida Consent Order that was approved and monitored by FDEP. Site assessments have been conducted at the SEC property for over 20 years and have included numerous investigations. In 2003, the lead agency for cleanup activities was transferred to EPA (Refs. 8, p. ES-1). The AOC signed and approved by EPA in June 2004 also included the General Dynamics property (Refs. 8, p. 1-1, Figure 1-4; 26, p. 3; 60). In 2005, URS conducted an RI at the SEC property. During the 2005 RI, 1,1-DCE (a degradation product of TCE and 1,1,1-TCA) was detected in a subsurface soil sample (Source No. 2) as well as ground water on the General Dynamics property, (sample DPGW-34(22') (Refs. 8, Figure 4-30; 49, Figure 3; 52, p. 24, B4-63; 77, p. 15) (see Figure 2 of the HRS documentation record). Due to this finding, EPA removed the eastern portion of the General Dynamics property from the AOC (Ref. 8, pp. 1-1, 1-2). Although the SEC SAA site located hydraulically upgradient (south of) of the General Dynamics property is a known source of ground water contamination (Ref. 10, p. 4, 5), upgradient background concentrations of 1,1-DCE indicate that releases from the SEC site did not contribute significantly to the increase of the concentration of 1,1-DCE in the General Dynamics Longwood site observed release sample (see section 3.1.1 Observed Release of this HRS documentation record) Additionally, analytical results from 1989 to 2005 indicate that the concentration of 1,1-DCE detected in direct push ground water sample, DPGW- 34(22'), collected from ground water underlying Source No. 2 on the General Dynamics property contained the highest concentration of 1,1-DCE (26,500 (ig/L) detected during ground water investigations conducted at the General Dynamics and SEC properties (Refs. 8, Figures 4-29 through 4- 32, 4-38, 4-39; 51, pp. 1 through 6; 77, p. 9; 96, Tables 1 through 4). To highlight this, the analytical and sampling data from 1988 to 2006 available in the references to the HRS documentation record have been reviewed to characterize the contamination levels in the ground water hydraulically upgradient of the release sample (see references cited on Figure 4 of this HRS documentation record); these data include historical results for monitoring well samples from the A-zone and B-zone of the surficial aquifer and direct push ground water samples. The sample locations selected for review are from the area depicted in Figure 4 of this HRS documentation record, which presents the 33 GW-Likelihood of Release ------- extent of the area considered hydraulically upgradient of the release sample, including approximate locations of the reviewed upgradient samples. As discussed in section 3.0.1 General Considerations, Ground Water Migration Pathway Description, of this HRS documentation record, a generally northern flow direction of ground water has been documented from various investigations at the site. The western- most extent of the upgradient area in Figure 4 was selected to be as inclusive as reasonably possible based upon analysis of the ground water flow direction maps provided in the references to the HRS documentation record (see references cited on Figure 4 of this HRS documentation record). No upgradient occurrence of 1,1-DCE or possible parent compound were found at levels sufficient to explain the concentration found in observed release sample DPGW-34(22'). In addition to SEC, another source of potential contamination may exist in the area. Continental Circuits, Inc. is located about 1.5 miles northwest of the General Dynamics property (Ref. 12, pp. 1, 2, 3, 4, 9, 10). However, Continental Circuits, Inc. is located hydraulically side gradient to the General Dynamics property and is not expected to impact contamination or releases at the General Dynamics property (Refs. 8, Figures 3-6, 3-7 and 3-10; 12, pp. 9, 10). Hazardous Substance in the Release 1,1 -dichloroethylene Ground Water Observed Release Factor Value: 550.00 34 GW-Likelihood of Release ------- 3.1.2 POTENTIAL TO RELEASE Potential to release was not evaluated for the upper and lower surficial aquifers because an observed release has been documented (see Section 3.1.1 of this HRS documentation record). The Hawthorne Formation, which underlies the surficial aquifer, is not continuous in the vicinity of the General Dynamics property. Specifically, the formation is absent about 240 feet north of the General Dynamics property; therefore, the surficial and upper Floridan aquifers are interconnected (Refs. 8, Figure 4-40; 29; 68, p. 18; 71, p. 32). 3.2 WASTE CHARACTERISTICS 3.2.1 TOXICITY/MOBILITY The toxicity and mobility factor values for the hazardous substance detected in the source sample with a containment factor value of greater than 0 are summarized in Table 15. The combined toxicity and mobility factor value is assigned in accordance with Reference 1, Section 3.2.1. The hazardous substance detected in the observed release to ground water is assigned a mobility factor value of 1 (Ref. 1, Section 3.2.1.2). TABLE 15: Ground Water Toxicity/Mobility Hazardous Substance Source No. Toxicity Factor Value Mobility Factor Value Does Hazardous Substance Meet Observed Release? (Yes/No) Toxicity/ Mobility (Table 3-9) Reference 1,1-DCE 2 100 1A Yes 100 2, p. BI-5 Notes: A Documented in the observed release to ground water. A mobility factor value of 1 is assigned (Ref. 1, Section 3.2.1.2). DCE Dichloroethylene No. Number Toxicity/Mobility Factor Value: 10,000.00 (Reference 1, Table 3-9) 35 GW-Likelihood of Release ------- 3.2.2 HAZARDOUS WASTE QUANTITY TABLE 16: Hazardous Waste Quantity Source No. Source Type Source Hazardous Waste Quantity 2 Contaminated soil Undetermined, but greater than zero The hazardous constituent quantity for Source No.2 is not adequately determined. The HWQ is undetermined, but greater than zero. As specified in Reference 1, Section 2.4.2.2, a HWQ factor value of 10 was assigned. Hazardous Waste Quantity Factor Value: 10 (Reference 1, Sec. 2.4.2.2) 3.2.3 WASTE CHARACTERISTICS FACTOR CATEGORY VALUE The waste characteristics factor category value was obtained by multiplying the toxicity/mobility and HWQ factor values, subject to a maximum product of 1 x 10s. Based on this product, a value was assigned in accordance with Reference 1, Table 2-7. Toxicity/Mobility Factor Value: 100.00 Hazardous Waste Quantity Factor Value: 10 Toxicity/Mobility Factor Value x Hazardous Waste Quantity Factor Value: 1,000.00 Waste Characteristics Factor Category Value: 6 (Reference 1, Table 2-7) 36 GW-Waste Characteristics ------- 3.3 TARGETS Residents in the vicinity of the General Dynamics property are provided drinking water from one of seven municipal systems: Seminole County, Casselberry, Lake Mary, Longwood, Winter Springs, Sanford, and Sanlando Utilities (Ref. 30). Seminole County operates three water treatment plants (WTP) served by 19 municipal wells, 9 of which are in two distribution systems within a 4-mile radius of the General Dynamics property. The Greenwood Lakes WTP (five wells) and Country Club WTP (two wells) make up one distribution system and the Heathrow WTP (two wells) makes up the second distribution system. Of the nine wells, four are located within 1 to 2 miles (Greenwood Lakes and Country Club WTPs), three are located within 2 to 3 miles (Greenwood Lakes WTP), and two (Heathrow WTP) are located within 3 to 4 miles of the General Dynamics property (Refs. 30; 31, pp. 1, 2, 3, 5, 7). The depths of the Greenwood Lakes WTP wells range from 480 to 900 feet, the depths of the Country Club WTP wells are 350 feet, and the depths of the Heathrow WTP wells are 325 and 390 feet (Refs. 31, pp. 1, 2; 61). All wells obtain water from the Upper Floridan aquifer (Ref. 31, pp. 1, 2). Water from the Greenwood Lakes and Country Club WTPs is combined into one distribution system and is mixed in the distribution lines. These two WTPs collectively serve about 18,094 people (18,094 7 wells = 2,584.86 people served per well) (Ref. 31, pp. 1,2). The second distribution system includes the Heathrow WTP along with three other WTPs. The Heathrow WTP operates five wells, two of which are located within 3-4 miles of the General Dynamics property (Ref. 30; 31, pp. 1, 2). The three other WTPs and their seven wells are not located within a 4- mile radius of the General Dynamics property. Water from the four WTPs is mixed in distribution lines and serves about 24,439 people collectively (24,439 people 12 wells = 2,036.58 people served per well). None of the Seminole County wells produces more than 40 percent of the total water supply in the distribution systems (Refs. 30; 31, pp. 1, 2). Water from the two distribution systems does not mix in the distribution lines to form one blended system (Ref. 31, p. 9). The City of Casselberry maintains nine municipal wells and three (N-l, N-2, and N-3) are located within 2 to 3 miles of the General Dynamics property (Refs. 30; 36, pp. 1, 2, 3). Of these three wells, one well obtains water from the Lower Floridan aquifer and two wells obtain water from the Upper Floridan aquifer. The depths of the wells range from 377 to 1,200 feet (Ref. 36, pp. 1, 2, 3). None of the City of Casselberry wells produce more than 40 percent of the total water supply. The water from the wells can be mixed in distribution lines. The City of Casselberry collectively serves 54,800 people or 6,088.89 people per well (54,800 people 9 wells) (Ref. 36, p. 1). The City of Lake Mary maintains five municipal wells located within 3 to 4 miles of the General Dynamics property (Refs. 30; 32, p. 1). None of the Lake Mary wells produce more than 40 percent of the total water supply. All wells obtain water from the Upper Floridan aquifer and the depths range from 500 to 695 feet. The water from all five wells is mixed prior to distribution to customers. The City of Lake Mary wells collectively serve 13,496 people (13,496 5 = 2,699.20 people served per well) (Ref. 32, pp. 1, 2; 62, pp. i, 1, 2). The City of Longwood maintains five municipal wells; two of the wells are located within 1 to 2 miles and 3 are located within 2 to 3 miles of the General Dynamics property (Refs. 30; 33, pp. 1, 4 through 9). None of the City of Longwood wells produce more than 40 percent of the total water supply. All wells obtain water from the Upper Floridan aquifer and the depths range from 300 to 500 feet. The water from all five wells is mixed prior to distribution to customers. The City of Longwood wells collectively serve 20,223 people (20,223 people 5 wells = 4,044.60 people served per well) (Ref. 33, pp. 1 through 10). The City of Sanford operates 19 municipal wells; six of the wells are located within 3 to 4 miles of the General Dynamics property (Refs. 30; 34, pp. 1, 2, 3). The wells located within the 4-mile radius of the General Dynamics property obtain water from the Upper Floridan aquifer and the depths range from 162 to 350 feet. None of the City of Sanford wells produce more than 40 percent of the total water supply. The water from all 19 wells is mixed prior to distribution to customers. The City of Sanford wells 37 GW-Targets ------- collectively serve 61,975 people (61,975 people 19 wells = 3,261.84 people served per well) (Refs. 34, pp. 1,2, 3; 63, pp. 3, 5, 6). The City of Winter Springs operates eight municipal wells; four of the wells are located within a 4-mile radius of the General Dynamics property. The wells are distributed as follows: 0.25 to 0.5 mile, one well; 0.5 to 1 mile, 1 well; and 2 to 3 miles, two wells (Refs. 30; 37, p. i). None of the City of Winter Springs wells produce more than 40 percent of the total water supply. The depths of the wells range from 290 to 491 feet deep and obtain water from the Upper Floridan aquifer. The water from all eight wells is mixed in distribution lines. The City of Winter Springs wells collectively serve 35,983 people (35,983 people 8 wells = 4,497.88 people served per well) (Refs. 37, p. i, 1, 2; 94). Sanlando Utilities maintains 11 municipal wells; six are located within 3 to 4 miles of the General Dynamics property (Refs. 30; 35, p. 1; 97). Well No. 8, located outside the 4-mile radius, supplies 50 percent of the total water supply (Ref. 35, p. 1). All wells obtain water from the Upper Floridan aquifer and the depths of the wells range from 420 to 925 feet deep (Ref. 97). The water from all 11 wells is mixed prior to distribution to customers. Sanlando Utilities collectively serves 35,700 people (Refs. 35, pp. 1 through 8). Therefore, the amount of people served by Well No. 8 is 17,850 (35,700 2) and the remaining 10 wells, which each contribute equally to the remaining 50 percent of the total water supply, serve 1,785 people served per well (17,850 10) (Refs. 35, p. 1; 97). The service areas for Sanlando Utilities, City of Longwood, and City of Winter Springs were obtained from their respective contact person (Refs. 33, p. 1; 35, pp. 1, 2; 37, pp. 2, 3). The service areas for the City of Sanford, Seminole County, and the City of Lake Mary were obtained from the St. Johns River Management District Consumptive Use Permits 162, 8213, and 8284, respectively (Refs. 38, p. 6; 39, pp. 7 through 10; 40, p. 6). Municipal wells located within a 4-mile radius of the General Dynamics property provide drinking water to about 116,336.52 people. The population served by these wells per distance ring is distributed as follows: > 0 to 0.25 mile, 0 people; > 0.25 to 0.50 mile, 4,497.88 people; > 0.50 to 1 mile, 4,497.88 people; > 1 to 2 miles, 18,428.64 people; > 2 to 3 miles, 41,061.92 people; > 3 to 4 miles, 47,850.20 people (Refs. 30; 31, pp. 1 through 8; 32, pp. 1, 2; 33, pp. 1 through 8; 34; 35, pp. 1 through 8; 36, pp. 1, 2, 3; 37, pp. i through 11) (also see Table 17 of this HRS documentation record). All of the wells in the area are screened in the Upper Floridan aquifer at a maximum depth of 925 feet (Refs. 31, pp. 1, 2, 9; 32, p. 1; 33, pp. 1, 2; 34; 35, p. 1; 36, p. 1; 37, p. 1; 94; 97). Seminole County, Sanlando Utilities, and the cities of Lake Mary, Sanford, and Casselberry have wellhead protection areas (Refs. 31, p. 2; 32, p. 1; 33, p. 1; 34, p. 1; 35, p. 1; 36). Therefore, wellhead protection areas are located within the 4-mile radius of the source at General Dynamics (Ref. 30). 38 GW-Targets ------- TABLE 17: Municipal Drinking Water Wells Within A Upper Floridan Aqui 4-Mile Radius Of General Dynamics er Distance Ring Miles Water System Name Number of Wells Well No. and Depth of Wells (feet bis) Level I Cont. (Y/N) Level II Cont. (Y/N) Potential Cont. (Y/N) Population Served References > 0.25 to 0.5 City of Winter Springs 1 Well No. 3-491 N N Y 4,497.88 30; 37; pp. i through 11; 94 >0.5 to 1 City of Winter Springs 1 Well No. 6 - 400 N N Y 4,497.88 30; 37; pp. i through 11; 94 > 1 to 2 Seminole County (Greenwood Lakes and Country Club WTPs) 4 Well No. 1 - 350 Well No. 2 - 350 Well No. 5 - 500 Well No. 4 - 700 N N Y 10,339.44 30; 31, pp. 1 through 8; 61 > 1 to 2 City of Longwood 2 Well No. 1 - 372 Well No. 2 - 390 N N Y 8,089.20 30; 33, pp. 1 through 10 > 2 to 3 Seminole County (Greenwood Lakes WTP) 3 Well No. 1 - 480 Well No. 2 - 900 Well No. 3 - 607 N N Y 7,754.58 30; 31, pp. 1 through 9; 61 > 2 to 3 City of Longwood 3 Well No. 3 - 427 Well No. 4 - 400 Well No. 5 - 400 N N Y 12,133.80 30; 33, pp. 1 through 10 > 2 to 3 City of Casselberry 2 Well No. N-2 - 377 Well No. N-l -388 N N Y 12,177.78 30; 36, pp. 1, 2,3 > 2 to 3 City of Winter Springs 2 Well No. 4 - 423 Well No. 5 - 440 N N Y 8,995.76 30, 37, pp. i through 11 > 3 to 4 Seminole County (Heathrow WTP) 2 Well No. 1 - 390 Well No. 4 - 325 N N Y 4,073.16 30; 31, pp. 1 through 8; 61 > 3 to 4 City of Lake Mary 5 Well No. 1 - 500 Well No. 2 - 500 Well No. 4 - 695 Well No. 5 - 560 Well No. 6 - 552 N N Y 13,496.00 30; 32, pp. 1, 2; 62, pp. i, 1,2 > 3 to 4 City of Sanford 6 Well L - 300 N N Y 19,571.04 30; 34, pp. 1, 39 GW -Targets ------- TABLE 17: Municipal Drinking Water Wells Within A Upper Floridan Aqui 4-Mile Radius Of General Dynamics er Distance Ring Miles Water System Name Number of Wells Well No. and Depth of Wells (feet bis) Level I Cont. (Y/N) Level II Cont. (Y/N) Potential Cont. (Y/N) Population Served References Well K - 328 Well J - 302 Well 1-303 Well H-350 Well G - 162 2, 3; 63, pp. 3,5,6 > 3 to 4 Sanlando Utilities 6 Well No. 1 - 925 Well No. 1A - 500 Well No. 2 - 420 Well No. 2A - 420 Well No. 3 - 830 Well No. 4 - 550 N N Y 10,710.00 30; 35, pp. 1 through 8; 97 Notes: > Greater than bis Below land surface Cont. Contamination ID Identification number N No WTP Water treatment plant Y Yes See Section 3.3, Targets of this HRS documentation record forthe method by which the population for the water systems listed in Table 17 were calculated. 40 GW -Targets ------- 3.3.1 NEAREST WELL Well ID: The City of Winter Springs has one well located within 0.25 to 0.5 mile southeast from the source at the General Dynamics Longwood site (Refs. 30; 37, p. 1). Level of Contamination (I, II, or potential): Potential If potential contamination, distance from source in miles: 0.25 to 0.5 The nearest well value is also based on karst ground water flow documented in Section 3.0.1 of this HRS documentation record. Nearest Well Factor Value: 20.0 (Ref. 1, Section 3.2.1.3) 3.3.2 POPULATION 3.3.2.1 Level of Contamination 3.3.2.2 Level I Concentrations No Level I wells have been identified. Level I Concentrations Factor Value: 0.00 3.3.2.3 Level II Concentrations No Level II wells have been identified. Level II Concentrations Factor Value: 0.00 41 GW -Targets ------- 3.3.2.4 Potential Contamination Distance-weighted population values for potential contamination ground water targets for the Upper and Lower Floridan aquifer are presented in Table 18. Ground water flow in the Floridan aquifer system is mostly through porous limestone, and is enhanced by networks of small fractures or solution openings that occur along joints or bedding planes. In some areas, flow may be through large cavernous features of paleokarst, resulting in a dual-porosity flow system (Ref. 68, pp. 19, 21, 23). Karstic ground water flow occurs in the Floridan aquifer within the entire 4-mile radius of the source at the General Dynamics Longwood site (Ref. 78). TAI !LE 18: Distance-Weighted Population Values - Karst Distance Category (Miles) Population Distance-Weighted Population Value (Ref. 1, Table 3-12) References Greater than 0 to 1/4 0 0 30 Greater than 1/4 to 1/2 4,497.88 3,233 30; 37, pp. i through 11 Greater than 1/2 to 1 4,497.88 2,607 30; 37, pp. i through 11 Greater than 1 to 2 18,428.64 8,163 30; 31, pp. 1 through 8; 33, pp. 1 through 10 Greater than 2 to 3 41,061.92 26,068 30; 31, pp. 1 through 8; 33, pp. 1 through 10; 36, pp. 1, 2; 37, pp. i through 11 Greater than 3 to 4 47,850.20 26,068 30; 31, pp. 1 through 8; 32, pp. 1, 2; 34, pp. 1, 2, 3; 35, pp. 1 through 8 Calculations: Sum of Distance - Weighted Population Values: 66,139 Sum of Distance - Weighted Population Values 10: 6,613.9 Potential Contamination Factor Value: 6,613.9 3.3.3 RESOURCES Wells used for resources were not identified within a 4-mile radius of the General Dynamics property. Resources Factor Value: 0.00 3.3.4 WELLHEAD PROTECTION AREA Seminole County, Sanlando Utilities, and the cities of Lake Mary, Sanford, and Casselberry have wellhead protection areas (Refs. 31, p. 2; 32, p. 1; 33, p. 1; 34, p. 1; 35, p. 1; 36, pp. 1, 2). Therefore, wellhead protection areas are located within the 4-mile radius of the source at General Dynamics (Ref. 30). The closest wells with wellhead protection areas are operated by the Seminole County and are located between 1 and 2 miles of the source at the General Dynamics Longwood site (Refs. 30; 31, pp. 1, 2). Wellhead Protection Area Factor Value: 5.00 42 GW -Targets ------- |