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b __ _ <br /> '�:k-' TAKEN <br /> egy,E � _.s— <br /> P F v 4 .nr fie,k 4 <br />�a <br /> i <br /> WORK PLAN FOR ADDITIONAL <br /> MONITORING WELL INSTALLATIONS <br /> CHEVRON SERVICE STATION No. 9-4275 <br /> 2905 W. BENJPMIN HOLT DRIVE <br /> STOCKTON, CALIFORNIA <br /> JUNE 1990 <br /> INTRODUCTION <br /> The following is a wort: 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 boring on, and one soil 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 /> BACXGROUND <br /> In May of 1990, Chevron retained Groundwater Technology Inc. <br /> to 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 /> 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 lecatii:ns. Figure a indicates the dissolved <br /> total petroleum hydrocarbons (TPH)-as-gasoline concentrations as <br /> c indicated by the last round of water samples collected from the <br /> wells. <br /> GROUNDWATER <br /> 'TECHNOLOGY,INC, <br /> { <br />