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Guardino & Crawford 3 - April 2012 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case. <br /> • Soil Excavation: Unknown volume of impacted soil was removed and disposed offsite in <br /> 2000. <br /> • In-Situ Soil/ Groundwater Remediation : Soil vapor extraction and air sparging , <br /> proposed , currently in public comment. <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 14 feet bgs and the <br /> groundwater gradient is northeast at approximately 0. 002 ft/ft. The nearest surface <br /> water body is McLeod Lake, which is approximately 1000 feet south of the Site. <br /> • Groundwater Trends: There are more than 12 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW-1 ) and down gradient <br /> (MW-2) . <br /> BENZENE Results for MW1 <br /> 450M <br /> 40000 <br /> -- <br /> 00 - � <br /> zoo E <br /> soo <br /> ,Bmo5000 <br /> BENZENE Trend <br /> BENZENE Results for MW2 <br /> >0 . <br /> so <br /> rj <br /> 40 <br /> 20 <br /> h _ T <br /> 10 <br /> �fe 4de 44P �4e <br /> I BENZENE_ — renJ <br /> Risk Evaluation <br /> There are no CDPH regulated supply wells present within 2, 000 feet of the Site . Drinking water <br /> at and near the Site is currently supplied by the California Water Service. <br /> Recommendation <br /> In May 2008 , the Fund made the following recommendation : The Fund recommends that the <br /> San Joaquin County LOP direct the Responsible Party to assess remedial technologies and <br /> implement active remediation in a timely manner. The Fund will review this site next year to <br /> track progress. <br />