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1 <br /> 1 0 <br /> C3EpM/CITRIX <br /> 2000 feet of the site vicinity(ATC,2000) According to ATC,the nearest well is located <br /> ' approximately 400 feet southeast of the site and is a monitoring well The nearest well potentially <br /> used for drinking water is a domestic well located approximately 1,300 feet to the south of the site In <br /> ' addition, San Joaquin County Department of Public Health Services ordinances require a nummum of <br /> 50 foot sanitary seal at the top of any public water supply well These sanitary seal requirements <br /> ' would preclude shallow affected water at the site from future use as a source of municipal water The <br /> nearest surface water is the Stockton deepwater channel, located approximately 650 feet north of the <br /> site in a hydrogeologicly upgradient direction <br /> The following is a summary of findings from this section for this site <br /> 1 The lateral extent of reported petroleum-related detections in groundwater is limited to the <br /> vicinity of the petroleum-impacted area and the volume is small, <br /> 2 No dissolved"plume"of petroleum affected groundwater associated with this petroleum- ? <br /> ' impacted area is present <br /> ' 3 It is highly unlikely that this localized area of petroleum affected shallow groundwater will <br /> migrate beyond its current limited spatial extent given that the release occurred at least 16 <br /> years ago <br /> 4 Shallow groundwater is not and likely will not be used directly as a source of dnnlung water <br /> ' 5 Environmental impacts (e g,to groundwater supply wells or surface water bodies)outside the <br /> immediate area of the former UST location are not likely to occur under current conditions <br /> 2.6 HUMAN HEALTH Risxs <br /> ' Based on available data,maximum concentrations of petroleum constituents detected in vadose zone <br /> soil were compared to environmental screening levels(ESLs) for soil at residential sites published by <br /> ' the Regional Water Quality Control Board, San Francisco Bay Region(2003 [updated Feb 2004]) <br /> The ESLs were developed to evaluate potential environmental impacts via several potential migration <br /> pathways and exposure routes The ESLs for potential human exposure via direct contact(i e , <br /> ingestion and dermal exposure) and inhalation of indoor air were used in this screening evaluation <br /> The maximum concentrations of toluene, ethylbenzene,and xylenes were 13,0 11, and 0 48 mg/kg, <br /> ' respectively,which are well below their respective ESLs for residential soil (130,4 7 and 45 mg/kg) <br /> Benzene,MTBE,and other fuel oxygenates were not detected in any samples analyzed <br /> I 1Doc_Safe19000s199631CARCAP txt doc 6 <br />