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Moller Investments • - 3- • August 25, 2011 <br /> Site History/Assessments <br /> In March 1987, soil contamination was identified during an environmental investigation. To <br /> date, 16 active monitoring wells have been installed and monitored regularly. A Site map <br /> showing the location of the current USTs, monitoring wells and groundwater level contours is <br /> provided at the end of this five year summary. <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case <br /> • Soil Excavation: Unknown <br /> • In-Situ Soil Remediation: No soil remediation has been conducted <br /> • Groundwater Remediation: No groundwater remediation has been conducted <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay. The depth to groundwater is approximately 48 feet bgs and the <br /> groundwater gradient is northeast at approximately 0.002 feet/foot. <br /> • Groundwater Trends: There are more than 8 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (S-1) and down gradient <br /> (MW-17) <br /> BENZENE Results for S-1 <br /> ao°o <br /> a°oB <br /> imOB <br /> .yam---�----«- <br /> ffi 800° I <br /> i r <br /> - BENZINE ---TMM <br /> BENZENE Results for MW-1] <br /> 0o III <br /> 02 <br /> 0 0 <br /> �00 <br /> 0 <br /> I <br /> Risk Evaluation <br /> No human health risk assessment is noted in Geotracker. There are no water supply wells or <br /> surface water receptors present within 1,000 feet of the Site. <br /> Recommendation <br /> April, 2008, the Fund recommends that the San Joaquin County LOP direct the Responsible <br /> Party to assess remedial technologies and the potential for hydrocarbons to migrate into nearby <br /> buildings. The Fund will review this site next year to track progress. <br />