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Canepa's Car Wash - 3 - January 23, 2012 <br /> Site Description <br /> The Site is located at 248 East Park Street in Stockton, California and is currently a car wash <br /> and active retail gasoline station. The Site is bounded by Hunter Street to the west, Park Street <br /> to the north, San Joaquin Street to the east and businesses to the south. The surrounding land <br /> use is mixed residential and commercial. <br /> Site History/Assessments <br /> In December 1990, soil contamination was identified during the removal of USTs. To date, 19 <br /> monitoring wells have been installed and monitored regularly. A Site map showing the location <br /> of the current USTs, monitoring wells and groundwater level contours is provided at the end of <br /> 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/ Groundwater Remediation: Dual phase extraction pilot test, conducted for <br /> 126 hours in April 2011, removed approximately 2,256 pounds of TPHg and 11,700 <br /> gallons of contaminated groundwater. <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 varies seasonally between 22 and 25 feet bgs <br /> and the groundwater gradient is northeast at approximately 0.004 ft/ft <br /> • Groundwater Trends: There are more than 17 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW-9), near down gradient <br /> (MW-11) and far down gradient (MW-17) <br /> BENZENE Results for MW9 <br /> 2500 <br /> 2000 <br /> o: <br /> Soo <br /> U / <br /> 10 <br /> --—BENZENE Trend <br /> BENZENE Results for MW11 <br /> 35000 <br /> 30000 <br /> 25000 <br /> 15000 <br /> �10000' •'��• /// <br /> 5000 <br /> 0 p <br /> --BENZENE Trend <br />