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.Michelotti's Auto Repair - 3 - :: January 26, 2012 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case <br /> • Soil Excavation: Approximately 750 cubic yards of impacted soil were removed and <br /> disposed offsite in 2003. An estimated 679,1 pounds of TPHg was removed by j <br /> excavation. <br /> stn-Situ Soil-Rerrtediation:``No-soil.remediation=ha:-trees=coon-d=ted <br /> Groundwater Remediation: Groundwater extraction, conducted from 2003 through June <br /> 2010 removed approximately 2,996,390 gallons of contaminated groundwater. <br /> General Site Conditions <br /> Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> sift and clay. The depth to groundwater is approximate 10 feet bgs and the groundwater <br /> gradient is westerly. <br /> • Estimate of Hydrocarbon Mass in Soil: Prior to remediation, Western Geo-Engineers <br /> estimated that approximately 699 pounds of TPHg remain in site soil:, <br /> • Groundwater Trends: There are more than 18 years of groundwater monitoring data for <br /> .,.this Site,.-Benzene trends-are.-shown below, source area-(MW-10)-and down-gradient--yw- r� - <br /> (MW-4) <br /> BENZENE Results for MW10 <br /> 2500 <br /> 2000 <br /> . 1500 <br /> 1000 <br /> �BENZEI+IE ��� Tread . <br /> BENZENE Results for MW4 <br /> 0.e j <br /> 0.3-- <br /> 0.2-- <br /> 0. <br /> .3 0.2 <br /> a <br /> "e ,01, <br /> Trend <br /> Risk Evaluation <br /> A soil vapor survey was conducted in March 2011 and all samples were found to be below <br /> California Human Health Screening Level thresholds. There are no water supply wells or <br /> surface water receptors present within 2,000 feet of the Site. <br /> r <br />