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S EC ® R go Circle K 8671 March 9,2006 Page 2 (MW-5, MW-6, and MW-7) were installed onsite by SECOR The results of this work are documented in SECOR's report titled Site Assessment Report, dated June 21, 2002 In November 2003, SECOR installed deep wells MW-8, MW-9, and MW-10 at the site Petroleum hydrocarbons were not reported in soil and groundwater samples from the new wells Vertical and lateral delineation of the plume has been completed On April 25, 2005, two soil vapor extraction wells (SVE-1 and SVE-2) were installed onsite by SECOR The results of this work are documented in SECOR's report titled SVE Well Installation and SVE Pilot Test Report, dated August 31, 2005 SENSTIVE RECEPTORS SECOR performed a sensitive receptor survey to identify the location of permitted water supply wells within a 2,000-foot radius of the site The sensitive receptor survey consisted of reviewing the California Department of Water Resources (DWR)files for locating water supply wells in the area, contacting the local water purveyor (San Joaquin County), and conducting a door-to-door field survey in search of any wells or other sensitive receptors within 1,000 feet of the site Four wells were identified within the surveyed area, one municipal well and three domestic wells The domestic well was identified as Colonial Heights municipal water supply well#3 (Well DW-3) The location of Well DW-3 was verified in the field and surveyed, and is situated 260 feet south of the site, on the south bank of Mosher Slough, which borders the intersection of Thornton Road and Davis Road Three additional water supply wells in the area were identified One well was identified at Bear Creek Veterinarian Hospital (Well DW-2), located at 8728 Thornton Road Well DW-2 is located 444 feet north of the site Another well is located at a residence (Well DW-4), located at 8732 Davis Road (180 feet north of the site) SECOR field staff located what appeared to be a domestic water supply well (Well DW-1)on the property located at 8855 Thornton Road that is 281 feet northwest of the site The resident was not available to confirm the existence of the well, and a well survey form was not completed by the property owner, however, the possible domestic well was housed in a similar enclosure as the previously identified wells in the field CURRENT ASSESSMENT ACTIVITIES No assessment activities were conducted this quarter MONITORING AND SAMPLING TRC's Groundwater Monitoring Report dated February 10, 2006 is included as Attachment 1, including Tables 1-3, Figures 1 -5A/5B, and field data sheets and groundwater analytical reports The site has been monitored and sampled quarterly from 1999 to the present Samples are analyzed for total purgeable petroleum hydrocarbons(TPPH),benzene,toluene,ethylbenzene,and total xylenes(collectively known as BTEX), and fuel oxygenates, including methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (EtBE), tertiary butyl alcohol (TBA), ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), and ethanol by EPA Method 82608 •