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.,� SRI <br /> oi^ar .tea ,y',' -r.+a•s'�r .- - " <br /> 'f. '� ,,, ,�,_:s i#ilk ,.�'v rte', ra-` r''� rPu v a •�:�,rx �. .-; w,.""7. <br /> :t <br />:h y <br /> J <br /> 3333 Da!a Drivq <br /> el sum, hoo <br /> fItnchn Cordova.CA n56'0 <br /> //® FAX <br /> G 638 Z 65 <br /> 33 <br /> Ennsulta ental FA7('976 6398335 <br /> ConsuFtanls,Inc. <br /> December 13, 1991 , <br /> i <br /> f <br /> Ms. Linda Turkatte <br /> Department of Environmental Health <br /> San Joaquin County Public Health Services <br /> P.O.Box 2009 <br /> Stockton, California 95201 <br /> Subject: Quarterly Ground Water Sampling Results <br /> 620 West Charter Way, Stockton, C1lifornia <br /> Shell WIC No.204-7524-4305 <br /> Delta Project No. 40-88-586 <br /> Dear Ms. Turkatte: <br /> Delta Environmental Consultants, Inc., has been authorized by Shell Oil Company to conduct an <br /> investigation of soil and ground water conditions at a shell service station located at 620 West Charter <br /> Way, Stockton, California, (Figures l and 2). The investigation is intended to characterize the <br /> distribution of petroleum constituents in soil and ground water beneath and adjacent to the site. This <br /> report summarizes quarterly ground water sampling activities from August 1 through <br /> November 15, 1991. <br /> Quarterly ground water sampling conducted on October 30, 1991,included measurement of water levels <br /> in the ten existing monitoring wells, checking for the presence of free-phase hydrocarbons or <br /> hydrocarbon sheen, and collection of ground water samples for chemical analysis. Monitoring well <br /> MW-2 could not be accessed on October 30; consequently,a water level measurement and sample were <br /> not obtained until November 15. All field activities were performed in accordance with the procedures <br /> described in Enclosure A. <br /> WaterJ�uyrl A h FI w Dir i n m H r u1i GrUdicn <br /> Ground water level measur lments recorded on October 30, 1991, are compiled in Table 1, along with <br /> previous ground water level measurements. On October 30, 1991, depth to ground water in the <br /> monitoring wells ranged from 30.97 (MW-1) to 38.75 (MW-10) feet below grade. Historic ground <br /> water elevations in monitoring wells MW-1, MW-5, MW-6, MW-8, and MW-9, are graphically <br /> illustrated in Figure 3. The ground water level measurements recorde A on October 30, 1991, indicate <br /> that the direction of shallow groundwater flow varies across the site, but generally trends to the north <br /> and northeast. Horizontal gradients range from approximately 0.02 to 0.1. A water table contour map <br /> prepared from the October 30, 1991,data is included as Figure 4. <br /> rw <br /> If — t(o `q� <br /> Delta Delivers S4lu V)s <br />