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1260 Grap ics Drive <br /> Modesto, alifornia <br /> 95351 <br /> 20957 2221 <br /> Fax 209.579. 25 <br /> %TC <br /> Fa, <br /> r`1!rr A S S o c I A T E S I N C }, r� <br /> May 21, 1998 <br /> Mr. Ronald Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division i <br /> 304 E. Weber Avenue, 3rd Floor f <br /> Stockton, CA 95202 <br /> Subject: First Quarter 1998 Groundwater Monitoring Report for the Fayette Manufacturing <br /> Site, 7675 West Eleventh Street, Tracy, California, SITE CODE: 2233 <br /> G <br /> Dear Mr. Rowe: <br /> As required by the San Joaquin County Public Health Services, Environmental Health Division <br /> (PHSIEHD) and at the request of Dr. A.R. Glover, ATC Associates Inc. has prepared this letter <br /> report summarizing the First Quarter 1998 groundwater monitoring and site activities performed <br /> at the above referenced site (Figure 1). Sampling was performed to monitor the distribution of <br /> petroleum hydrocarbons in groundwater. Monitoring was performed to determine the <br /> groundwater flow direction and the hydraulic gradient in the uppermost aquifer. <br /> BACKGROUND <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 /> Previous Work <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 present in the southern <br /> UST excavation (Figure 2). Soil samples were collected from 2 feet below the bottom of the <br /> USTs, and petroleum constituents and lead were detected in the soil samples. <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 /> samples were collected from the borings. On July 21, 1995, Smith Technology developed and <br /> wA951221Repor&\1QMR1998.doc 1 <br />