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"Y CarpoPalion <br /> A MeL ber of The IT Group <br /> Quarterly Summar Report <br /> Third Quarter 999 <br /> Tosca (former Unocal) Service Station 45417 <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, 00-gallon), associated product lines and <br /> dispensers. During dispenser upgrade activities on Janu 14, 1998, IT collected soil samples <br /> from locations beneath each product dispenser. Elevated levels of TPH-g and MtBE were <br /> detected in the subsurface. To further define the extent of impacted soil and groundwater, 10 <br /> Geoprobes® were completed on July 23 and 24, 1998 and three groundwater monitoring wells <br /> were installed on'August 20, 1998. Assessment activitic s showed that case closure is appropriate <br /> under low risk criteria. <br /> RECENT QUARTER ACTIVITIES <br /> • Submitted Quarterly Summary Report. <br /> • Submitted Request for Closure July 13, 1999. <br /> • Received SJCPHS-EHD concurrence with closure recommendation August 12, 1999. <br /> • Received site closure concurrence from Regional Water Quality Control Board <br /> September 30, 1999 <br /> ANTICIPATED NEXT QUARTER ACTIVITIES <br /> • Prepare and submit work plan for abandonment of monitoring wells. <br /> • Abandon monitoring wells and submit documentation of well destruction. <br /> 9110072A/3Q99 10/14/99 <br /> 2 <br />