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George's Service • - 3 - • January 30, 2012 <br /> Site Description <br /> The Site is located at 1600 West Durham Ferry Road in Tracy, California. The Site is bounded <br /> by Ahern Road to the southwest, Durham Ferry Road to the north and a residence to the <br /> southeast. The surrounding land use is mixed residential, commercial and agricultural. <br /> Site History/Assessments <br /> In January 1990, soil contamination was identified during the removal of USTs. To date, 16 <br /> monitoring wells have been installed and monitored regularly. A Site map showing the location <br /> of the former USTs, monitoring wells and groundwater level contours is provided at the end of <br /> this five year summary. <br /> Remediation Summary <br /> • Free Product: Free product noted in MW-2. None noted since 1998 <br /> • Soil Excavation: An estimated 500 cubic yards of impacted soil was removed and <br /> disposed offsite in 2001, estimated to have removed 4,900 pounds of TPHg. <br /> • In-Situ Soil/ Groundwater Remediation: Soil vapor extraction and air sparging has been <br /> proposed <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed gravel, <br /> sand, silt and clay. The depth to groundwater at approximately 13 feet bgs and the <br /> groundwater gradient is north at approximately 0.002 ft/ft. <br /> • Estimate of Hydrocarbon Mass in Soil: Prior to remediation, GTI estimated that <br /> approximately 5,275 kg of TPHg remained in site soils. In 2010, GTI estimated that <br /> approximately 3,060 pounds of TPHg. <br /> • Groundwater Trends: There are more than 16 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, near source area (MW-2) and down <br /> gradient (MW-7) <br /> BENZENE Results for MW-2 <br /> Boon <br /> aw <br /> g® a <br /> mw lw7't� 1 <br /> oo <br /> rood01 <br /> p <br /> w BENZENE - -Trend <br /> FBENZENE Results for MW.7 <br /> OB <br /> 03 <br /> 0.3 <br /> oe,. <br /> o., 7 7 7 ® Win_ <br /> I �--BENZENE Trend <br />