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Quarterly Summary Report _ <br /> First Quarter 1999 <br /> Tosco (farmer Unocal?Service Station #5417 <br /> 1700 East Yosemite Avenue <br /> Manteca, California <br /> CITY Manteca <br /> COUNTY San jum <br /> BACKGROUND <br /> The site is located at 1700 East Yosemite Avenue (State Highway 120) in Manteca, California <br /> and is currently an operating service station and mini-mart that retails unleaded gasoline fuel <br /> The site contains two gasoline USTs (10,000-gallon), associated product lines and dispensers <br /> During dispenser upgrade activities on January 14, 1998, IT collected soil samples from <br /> locations beneath each product dispenser Elevated levels of TPH-g and MtBE were detected in <br /> the subsurface To further define the extent of impacted soil and groundwater, 10 Geoprobes® <br /> were completed on July 23 and 24, 1998 and three groundwater monitoring wells were installed <br /> ion August 20, 1998 A review of DWR files identified 5 wells within a %2-mile radius of the site <br /> No known shallow aquifer drinking water,wells were identified during this investigation <br /> RECENT QUARTER ACTIVITIES <br /> • The Fourth Quarter 1998 Quarterly Summary Report (QSR) was submitted <br /> • The First Quarter 1999 sampling event was conducted <br /> ANTICIPATED NEXT QUARTER ACTIVITIES <br /> • The First Quarter 1999 QSR will be submitted <br /> • The Second Quarter 1999 quarterly sampling event will be conducted <br /> 9110072A/1 Q99 04/19/99 <br /> 2 <br />