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F <br /> coppo"tion <br /> t1 Member of The IT Group <br /> Quarterly Summa y Report <br /> Second Quarter 1999 <br /> Tosco (former Unocal) Service Station#5417 <br /> 1700 East Yosemite Avenue <br /> Manteca, California <br /> CITY Manteca <br /> COUNTY _ San Joaquin <br /> BACKGROUND <br /> The site is located at 1700 East Yosemite Avenue (State Highway 120) in Manteca, California <br /> and is currently an operating 76 Products service station and mini-mart that retails unleaded <br /> gasoline fuel. The site contains two gasoline USTs (10,000-gallon), associated product lines and <br /> dispensers. During dispenser upgrade activities on Janu ary 14, 1998, IT collected soil samples <br /> from locations beneath each product dispenser. Elevate levels of TPH-g and MtBE were <br /> detected in the subsurface. To further define the extent Df impacted soil and groundwater, 10 <br /> GeoprobesO were completed on July 23 and 24, 1998 d three groundwater monitoring wells <br /> were installed on August 20, 1998, <br /> RECENT QUARTER ACTIVITIES <br /> • Submitted Quarterly Summary Report. <br /> • Prepared closure documents. <br /> ANTICIPATED NEXT QUARTER ACTIVITIES <br /> • Submit request for site closure. <br /> • Receive site closure. <br /> • Submit Quarterly Summary Report. <br /> 9110072A/2Q99 July 15, 1999 <br /> 2 <br />