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_ �mm sf - <br /> 'A..`mi-sem <br /> Npl" <br /> � <br /> 8 <br /> '6rORK 1 r-W FOR ADDITIONAL <br /> MO','TITORING WELT, INSTALLATIONS <br /> CHEVRON SERVICE STATION No. 9-4275 <br /> 2905 W. BENTAMD1 HOLT DRIVE <br /> STOCKTON, CALIFORNIA <br /> JUNE 1990 <br /> INTRODIICTION <br /> • <br /> The following is a work plan for additional assessment work <br /> to be performed at Chevron U.S.A. Inc. (Chevron) Service Station <br /> No. 9-4275, located at 2905 W. Benjamin Holt Drive in Stockton, <br /> California. Specifically, this additional assessment will entail <br /> the drilling of one soil Loring on, and one Sri]. .boring off the <br /> subject site. Both borings will be completed as groundwater <br /> monitoring wells. The primary focus of this phase of the on- <br /> going assessment is to further define the extent of dissolved <br /> gasoline hydrocarbons below, and adjacent to the subject site. <br /> i BACF.GROU9D <br /> ,i In May of 1990, Chevron retained Groundwater Technology Inc, <br /> i `Zo implement additional assessment at this site. The site is <br /> located at the intersection of W. Benjamin Holt Drive and <br /> Plymouth Road in Stockton, California (Figure 1) , Previous work <br /> performed at this site by other consulting firms includes the <br /> removal of the Original underground-storage tanks, performance of <br /> a soil-vapor survey, and the installation of five, on-site <br /> 1 groundwater monitoring wells. All of this work was conducted in <br /> .1989• Figure 2 indicates the site configuration, including the <br /> locations of the former and current underground-storage tanks and <br /> the monitoring well locations. Figure 3 indicates the dissolved <br /> total petroleum hydrocarbons (TPH)-as-gasoline concentrations as <br /> indicated by the last round of water samples collected from the <br /> wells. <br /> GROUNDWATER <br /> ' TECHNOLOGY.INC. <br /> i . . <br /> 1. r <br />