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Site Background Information: Stallworth Auto Sales Page 10 of 11 Hydrogeologic Unit 10 (HU10) - extends from 195 feet to 200 feet bsg; HU10 is predominately silt and clay; the unit is characterized by moderate and some low pore pressures. SENSITIVE RECEPTOR SURVEY A sensitive receptor survey was conducted for the site. The area encompassed by the 2000-foot search radius and the water wells located during the search are depicted on Figure 3 in the AGE-prepared Sensitive Receptor Survey, dated 12 January 2001. Drinking water at and near the site is supplied by the City of Stockton municipal well system.The municipal wells in the site area are maintained by the California Water Service Company (CWSC). CWSC station numbers (wells) 42-01 and 53-01 are both located within 2,000 feet of the subject site. Water well 42-01 was located on East Poplar Street between San Joaquin Street and Hunter Street, 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. 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 County EHD did not locate any septic pits or septic systems on-site. Advanced GeoEnvi ron mental,Inc.