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Port of Stockton - 3 - May 2012 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case <br /> • Soil Excavation: An estimated 180 cubic yards of impacted soil was removed and <br /> disposed offsite in February 1988 <br /> • In-Situ Soil Remediation: None noted in Geotracker <br /> • Groundwater Remediation: In-situ chemical oxidation, ozone injection pilot test <br /> conducted in February 2010, determined to be ineffective <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay. The depth to first groundwater is approximately 10 feet bgs and the <br /> groundwater gradient is locally mounded flowing predominantly north and south from the <br /> former UST basin. The closest surface water is the San Joaquin River, located less than <br /> 1,000 feet north of the Site. <br /> • Estimate of Hydrocarbon Mass in Soil: WGR, Inc. estimates that approximately <br /> 489 pounds of TPHg are sorbed to site soils <br /> • Groundwater Trends: There are more than 12 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW3-3) and down gradient <br /> (north, MW3-8) and down gradient (south, MW3-7) <br /> BENZENE Results for MW3-3 <br /> Soo <br /> 700 ....__..._.----- <br /> 600 <br /> ^^500 <br /> 300 — -- <br /> 200 - <br /> w <br /> 1001 <br /> of w _ <br /> 1d' 10' Iod, l <br /> ..w BENZENE www Trend <br /> BENZENE Results for MW3-8 <br /> 6000 <br /> 5000' <br /> 4000 <br /> 3000. <br /> i <br /> I <br /> 0 <br /> BENZENE w w Trend <br />