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V 1117 Lone Palm Avenue <br /> Suite B <br /> Modesto, CA 95351 <br /> 209.579.2221 <br /> CATCY,1 Fax 209.579.2225 <br /> A S S O C I A T E S I N C <br /> February 25, 1999 <br /> 17861 <br /> Mr. Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject: Fourth Quarter 1998 Groundwater Monitoring Report for the Fayette <br /> Manufacturing Site, 7675 West Eleventh Street, Tracy, California, SITE CODE: <br /> 2233 <br /> Dear Mr. Rowe: <br /> As required by the San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) and at the request of Dr. A.R. Glover, ATC Associates Inc. has prepared this letter <br /> report summarizing the Fourth Quarter 1998 groundwater monitoring and site activities <br /> performed at the above referenced site (Figure 1). Sampling was performed to monitor the <br /> distribution of petroleum hydrocarbons in groundwater. Monitoring was performed to determine <br /> the groundwater flow direction and the hydraulic gradient in the uppermost aquifer. <br /> SITE LOCATION <br /> The project site is located at 7675 West Eleventh Street, between MacArthur Drive and Chrisman <br /> Road, in Tracy, California. The site location is shown on Figure 1. The vicinity of the site is <br /> primarily a commercial and industrial area. The property is owned by Dr, A.R. Glover. <br /> The site is located on generally level terrain which slopes gently toward the Tom Paine Slough, a <br /> northwest trending extension of the delta located approximately 2.5 miles north of the site. <br /> BACKGROUND <br /> i <br /> On October 15, 1986, two 500-gallon gasoline underground storage tanks (USTs) were removed <br /> from the site. During removal of the USTs, petroleum product was noted in the southern UST <br /> excavation (Figure 2). Soil samples were collected from 2 feet below the bottom of the USTs, <br /> and petroleum constituents and lead were detected in the soil samples. <br /> i <br /> On July 18, 1995, Smith Technology supervised the installation of three groundwater monitoring <br /> wells, MW-1, MW-2, and MW-3 (Figure 2). During installation of the monitoring wells, soil <br /> w:1178611reportsl4gmr1998,doc 1 <br />