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h <br /> w <br /> Van De Pol Enterprises " - 3 - August 29, 2011 <br /> Site Description - <br /> The Site is located at 2402 North Pacific Avenue in Stockton, California and is an empty lot- <br /> The Site is bounded by North Pacific Avenue to the west, business to the north, a residence to <br /> the east and Castle Street to the south. The surrounding land use is mixed residential and <br /> commercial. <br /> Site History!Assessments <br /> In August 1991, soil contamination was identified during an environmental investigation. To <br /> date, 19 active monitoring wells have been installed and monitored regularly. A Site map <br /> showing the location of the monitoring wells and groundwater level contours is provided at the <br /> end of this five year summary. i. <br /> Remediation Summary <br /> •' Free Product: No free pioduct was documented throughout4ie_'life`of <br /> w <br /> ' At- - x: ':�:..:y � + ..;K..moi �i.Z'.�'* " <br /> • Soil Excavation: Unknowns c - ` r <br /> • In-Situ Soil/ Groundwater Remediation: Soil vapor extraction and air sparging, <br /> conducted from April 2000 through ,dune 2004 removed approximately 12,122 pounds of <br /> TPH9 <br /> • Groundwater Remediation: Groundwater extraction, 2003 through present <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 from 23 to 27 feet bgs and the , . Y <br /> groundwater gradient is northeast at 0.004 feet/foot. <br /> • Groundwater Trends: There are more than 15 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (AW-1A) and down gradient <br /> (MW-4) I <br /> ^• BENZENE Results for AW1A w <br /> aaoo <br /> loo <br /> d <br /> BENZENE Results for MW 4 <br /> I <br /> . t <br />