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PUBLIC HEALTH SERVICESCLU I <br /> SAN JOAQUIN COUNTY F <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 oq`i FOR��P <br /> (209)468-3400 <br /> 1r <br /> JACK GRIFFITH <br /> QUIK STOP MARKETS <br /> P O BOX 5745 APR 15 1993 <br /> FREMONT CA 94537 <br /> RE: QUIK STOP #120 SITE CODE: 1261 <br /> 9321 THORNTON ROAD <br /> STOCKTON CA <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has <br /> recently completed a comprehensive review of the activities to date at the above noted site <br /> and has the following comments. <br /> As the past two years of groundwater data suggest, the groundwater beneath this site does <br /> not appear to be currently impacted by petroleum hydrocarbons. However, in order for <br /> PHS/EHD to evaluate this site for closure and in addition to the groundwater data compiled <br /> to date, verification must be made to show that the documented soil contamination at this <br /> site will not pose a threat to groundwater in the future. <br /> The areas of documented soil contamination that may be a potential future threat to <br /> groundwater are the soils underlying the gasoline and diesel fuel tanks (soil sample results <br /> from the installation of the vadose monitoring wells in 1987), the area of the former regular <br /> gasoline pipeline release(1990),and any residual soil contamination resulting from these two <br /> releases that may have attenuated in the soil as the contamination migrated laterally and <br /> vertically (soil sample results from the installation of the three monitoring wells in 1990). <br /> San Joaquin County Flood Control maps (1986) show seasonal high groundwater for this <br /> area to be at approximately 30 feet below ground surface (BGS). The soil verification data <br /> must indicate that the groundwater would not become impacted by the residual <br /> hydrocarbons documented to be left behind in the soil should the water table again rise to <br /> 30 feet BGS. <br /> Groundwater levels in the Stockton area have been rising due to current regional recharge <br /> activities. Data gathered from the monitoring wells during times of high water table levels <br /> may give an indication as to whether any residual hydrocarbons in the soil are actually being <br /> A Division of 4,an Joaquin County Health tare bctvices 7 <br />