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i C., ASS O C I ATE S INC construction logs are contained inppendix E Based on ATC's current work at the site, the inferred regional groundwater gradien ss e southwest. The wells located at the corner of West Main Street and Los Angeles Avenue (Well Nos. 6 and 7) are the closest to the site (approximately 400 feet southwest and downgradient). Groundwater well construction logs provided by DWR indicate the wells are groundwater monitoring wells V and are not used for drinking water. The wells are owned by East Bay Municipal Utilities District and are identified as monitoring wells MW8 and MW9, indicating that there are possibly seven more groundwater monitoring wells at this location. The six remaining groundwater wells are located greater than 500 feet of the site to the south and southwest. According to the information on the groundwater well construction logs, only one of these groundwater wells is identified as a drinking water well and one of these groundwater wells F is identified as an irrigation well. Because the area is serviced by the City of Stockton for water rV and sewer, it is unlikely that the domestic well is utilized as a drinking water source. The domestic well is approximately 1,300 feet south of the site. �. 6.0 ADDITIONAL SITE ACTIVITIES On June 19, 2000, ATC personnel transported and disposed of four 55-gallon drums of soil cuttings and on July 26, 2000, ATC personnel transported and disposed of one 55-gallon drum of soil cuttings generated during the advancement of soil borings and monitoring wells. Prior to the soil disposal, analytical data was supplied to Allied Waste Landfill to profile the soil for the appropriate disposal method. ATC transported the soil to the Allied Waste Landfill in Stockton, California where it was properly disposed. Copies of the non-hazardous waste manifests are included in Appendix F. On April 7, 2000, ATC personnel supervised the transport and disposal of approximately 680 gallons of monitoring well purge water stored on site. Prior to the groundwater disposal, analytical data was supplied to Clearwater Environmental to profile the groundwater for treatment. The purge water was transported to Alviso Independent Oil in Alviso, California LM where it was recycled. A copy of the non-hazardous waste manifest is included in Appendix F. On June 19, 2000, ATC personnel supervised the transport and disposal of approximately 230 �. gallons of monitoring well purge water stored on site. Prior to the groundwater disposal, analytical data was supplied to Nor Cal Oil to profile the groundwater for treatment. The purge water was transported to Seaport Environmental in Redwood City, California where it was recycled. A copy of the non-hazardous waste manifest is included in Appendix F. 7.0 DISCUSSION fi . Based on the analytical results and field observations, the soil and groundwater beneath the location of the former 10,000-gallon UST appears to be impacted with TPHd. Groundwater wA54.625001reportslsumiii.doc 8