ARCHIVED REPORTS_XR0006749 CASE 1

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d A total of 38 soil samples and all 11 of the groundwater-grab samples were labeled and stored in an iced cooler for transport with chain-of-custody documentation to Kiff Analytical, LLC (Kiff), a state of California certified hazardous waste testing laboratory (Certification #2236) Kiff analyzed all of the soil and groundwater-grab samples for TPH-as-gasoline, BTEX, MTBE, df- isopropyl ether (DIPE), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether (TAME), ' tertiary butanol (TBA), methanol and ethanol by EPA Method 8260B All laboratory analyses were performed on a standard turn-around ' At the request of PHSIEHD, one groundwater sample (from SB-7) was split and submitted to an alternate laboratory for analysis The sample was submitted with chain-of-custody ' documentation to CLS Labs (CLS), a state of California certified hazardous waste testing laboratory (Certification # 1233) CLS analyzed the gropndwater sample for TPH-as-gasoline, methanol and ethanol by EPA Method 8015M, for BTEX by EPA Method 602, and for MTBE, DIPE, ETBE, TAME, and TBA by Modified EPA Method 8260 23 Water Well Survey To identify sensitive receptors in the vicinity of the site, Ramage Environmental performed a survey of water wells within a 2,000-foot radius of the site The survey included reviewing well completion reports at the California Department of Water Resources (DWR) office in ' Sacramento, contacting the local water purveyor, and walking the site vicinity to confirm the location and status of any identified wells ' On August 30, 1999, Ramage Environmental reviewed DWR's well completion reports for water wells located within a 2,000-foot radius of the site Five wells, including one located lust outside of the 2,000-foot radius, were included in DWR's records A map with the locations of these five wells, a table summarizing the well construction and purpose, and copies of the well completion ' reports are included in Appendix D On October 19, 1999, Ramage Environmental contacted Ms Diane Martin of the City of Manteca Department of Public Works, Water Division Ms Martin indicated that the city is the only water purveyor in the area and that water is derived from three operating wells in the area of the site (City Wells#3, 10 and 19) Only City Well#19 is located within a 2,000-foot radius of ' the site City Well #19 (identified as Well Number 4 on the map and table in Appendix D) is located approximately 1,500 feet southwest of the site City Wells#3 and #10 are located approximately 2,500 to 3,000 feet northwest of the site According to Ms Martin, the municipal well identified as Well Number 1 in Appendix D, has been abandoned and is out of service 10