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Quarterly Summary Report <br /> , Fourth'Quarter 1998 <br /> Former Unocal Service Station#5417 <br /> 1700 East Yosemite Avenue <br /> Manteca, California <br /> BACKGROUND <br /> The site is located at 1700 East Yosemite Avenue (State Highway 120) in Manteca, California The site is <br /> an operating service station that retails unleaded gasoline fuel The site currently contains two gasoline <br /> USTs (10,000-gallon) and associated product lines and dispensers <br /> On January 14, 1998, at the direction of Mr Infurna (SJCPHS-EHD), IT collected seven soil samples <br /> from four locations beneath each product dispenser The soil samples were collected from depths of <br /> approximately 2 to 5-1/2 feet below ground surface (bgs) The selected soil samples were analyzed for <br /> total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX), and methyl tertiary butyl ether (MtBE) <br /> A soil and groundwater investigation was conducted in three phases, 1) Well Survey, 2) Geoprobe(D Soil <br /> and Groundwater Investigation, and 3) Groundwater Monitoring Well Installation The well survey <br /> identified 5 wells within a 5-mile radius of the site No known shallow aquifer drinking water wells are <br /> located within a '/z mile radius of the site IT installed ten Geoprobes® at the site on July 23 and 24, <br /> 1998 The installation of three groundwater monitoring wells was conducted by IT on August 20, 1998 <br />� Selected soil and groundwater samples were submitted to a state certified laboratory and analyzed for <br /> i TPH-g, BTEX, and seven oxygenates _ <br /> FOURTH QUARTER 1998 ACTIVITIES <br /> • The Third Quarter 1998 Quarterly Summary Report (QSR) was submitted <br /> • The Fourth Quarter 1998 sampling event was conducted <br /> ANTICIPATED FIRST QUARTER 1999 ACTIVITIES <br /> • The Fourth Quarter 1998 QSR will be submitted <br /> • The First Quarter 1999 sampling event will be conducted <br /> CHARACTERIZATION/REMEDIAL STATUS <br /> Current Phase of Project? Groundwater Monitoring and Sampling <br /> Frequency of Sampling? Quarterly <br /> Current Remediation Techniques? N/A <br /> Soil remediation in progress? N/A <br />. Start? N/A <br /> 9110072A/4Q98QSR March 4, 1999 <br />