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Site Background Information: Stallworth Auto Sales Page 10 of 10 approximately 1 ,500 feet northwest of Stallworth Auto Sales . Water well 42-01 was completed to a total depth of 450 feet below surface grade (bsg) . AGE was unable to discover screen interval for water well 42-01 . According to Eric Maar of CWSC, well 42-01 was abandoned in the 1970's. Well 53-01 is located on North Aurora Street between Lindsay Street and Fremont Street, approximately 1 ,500 feet east of the subject property. Water well 53 -01 is completed to a total depth of 564 feet bsg with a 278-foot screen interval from 252 feet bsg to 530 feet bsg. On 01 December 2000, a representative of AGE performed an area reconnaissance for visually observable potential receptors within a 2,000-foot radius of the site. No additional municipal, irrigation, agricultural, federal or county water wells were located during the visual search. However, 21 ground water monitoring wells were observed at 4 different locations. A summary of all wells j located during the receptor survey is presented in Table A6. i ; i On 16 November 2000, a representative of AGE conducted a search at the California Department of Water Resources of well drillers reports for water wells located in the surrounding area. Drillers reports for water wells located within a 2000-foot radius were found for CWSC water wells 42-01 and 53-01 . No additional wells were located within 2,000 feet of the subject property on the Department of Water Resources (DWR) database or the San Joaquin County Flood Control and Water Conservation District (SJCFC&WCD) map. No other wells were identified during the physical survey. A review of files on record with the San Joaquin CoumyEHD did not locate any septic pits or septic systems on-site. j , QUARTERLY GROUND WATER MONITORING PROGRAM I Quarterly ground water monitoring commenced June 2000; to date, thirty-five ground water monitoring events have been conducted at the site. Ground water flow direction at the site has been consistently towards the northeast to east. Since December 2005, COC have been detected in all wells except MW-3 through MW-5 . The highest concentration of dissolved hydrocarbons continues to be in the area of the former USTs; TPH-g, TPH-d, BTEX constituents, and 1 ,2-DCA are present in significant concentrations in monitoring well MW- lA and MW-B . Newlyinstalledwells, MW- 10 j and MW- 11 (screened from 60 to 70 feet bsg) contained high detections of COC during the first quarter 2008 sampling event, the commencement of sampling for the two wells. The lateral extent of hydrocarbon-impacted ground water withing the 60 to 70 feet bsg ground water bearing zone is unknown to the north and northeast. 11 I Advanced GeoEnvironmental, Inc. I