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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www.atc-enviro.com <br /> TC r. it r3 , , °i. 1! ,l_7E! 209.579.2221 <br /> ' Fax 209.579.2225 <br /> A S S O C I A T E S I N C <br /> 03 NOY L t. <br /> November 4, 2002 <br /> Mr. Nuel Henderson <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject: Addendum to Additional Site Evaluation and Request for No Further Action for <br /> Fayette Manufacturing Corporation, 7675 West Eleventh Street, Tracy, <br /> California <br /> Dear Mr. Henderson: <br /> This technical report has been prepared by ATC Associates Inc. to evaluate the level of risk which <br /> residual petroleum hydrocarbons pose to human health and the environment at the former Fayette <br /> Manufacturing Corporation facility (Figure 1). The scope of work herein, is based in accordance <br /> with correspondence from San Joaquin County Environmental Health Department (EHD) dated <br /> October 2, 2001. ATC submitted a request for site closure to EHD in June 2000. EHD <br /> requested that computer modeling be performed to support our hypothesis regarding impacts of <br /> the hydrocarbon plume on the on-site domestic well. <br /> BACKGROUND <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 observed in the southern <br /> portion of the UST excavation (Figure 2). Soil samples were collected from 2 feet below the <br /> bottom of the 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 at the locations shown on Figure 2. During installation of the <br /> monitoring wells, soil samples were collected from the borings. On July 21, 1995, Smith <br /> Technology developed and sampled monitoring wells MW-1, MW-2, and MW-3. Analytical <br /> results of the soil samples collected delineated the vertical extent of petroleum hydrocarbon <br /> contamination of the vicinity of the former gasoline UST locations. Soil and Groundwater <br /> analytical results are summarized in Tables 1 and 2, respectively. This phase of work was detailed <br /> in Smith Technology Corporation's Problem Assessment Report, Fayette Manufacturing <br /> Corporation, 7675 West Eleventh Street, Tracy, California, dated November 7, 1995. <br /> On September 24 and October 2, 1996, Smith Technology supervised the advancement of nine <br /> additional soil borings, SB-1 through SB-7 and FPB-1 and FPB-2 at the locations shown on <br /> Figure 2. The borings were advanced utilizing direct push technology and soil, soil vapor, and <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />