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A 210 <br /> erg +i: <br /> 21 <br /> e'rar ,e -,n <br /> 3330 Data Drive <br /> AU G 2 7 i991 s,r�ton <br /> Saa.jmento,CA 95,70 <br /> Delta AE N V I R 0 i�' 1ENTAL i-3EA!fH FAX:9J6;638 <br /> Enylrvnmental FAX:gf6:G3d-rs'ti:, <br /> Consultants,Inc. PEIRMIT/SERVICE'S <br /> August 26, 1991 <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 Watcr Sampling Results and <br /> Installation of Additional Ground Water Monitoring Well <br /> 620 West Charter Way,Stockton,California <br /> Shell WIC No.204-7524-4305 <br /> Delta Project No.40-88-586 <br /> Dear Ms.Turkatte: <br /> —� <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 i and 2). The investigation is intended to characterize the <br /> distribution of petroleum constituents in soil and ground%%Wc bencatlt au{I adjacent to the site. This <br /> letter report summarizes site activities from May 1 through August 1, 1991,including quarterly ground <br /> water sampling and installation of an off-site ground water monitoring well. <br /> Quarterly ground water sampling conducted on July 23, 1991,included measurement of water levels in <br /> each of the nine existing monitoring wells,checking for the presence of free product or product sheen, <br /> and collection of ground water samples for chemical analysis. Installation of monitcr140AWM.+ <br /> intended to help assess the downgradient extent of petroleum hydrocarbon constituents in ground water, <br /> Water levels in the monitoring wells were measured again, and a <br /> was performed an duly 25, 1991• i <br /> itoring well MW-10 on August 1.1991. All field activities <br /> ground water sample was collected from mon <br /> were performed in accordance with the procedures described in Enclosure A <br /> Water 1,eve!De th FIS ,,D1rectian and 1I drmulic Gradient <br /> Groundwater level measurements recorded on July 23 and August 1,1991,are compiled.n Table 1,wi'.h <br /> previous ground water level measurements. On August 1, 1991,depth to ground water in the monitoring <br /> wells ranged from 30.27(MW-1)to 37.75 (MW-10)feet below grade. Historic ground water elevations <br /> in monitoring wells MW-1, MW-5,MW-6, MW-8,and MW-9,are graphically illustrated in Figure 3. <br /> The ground water level measurements recorded on August 1, 1991, indicate an inferred direction of <br /> t of approximaty <br /> water bleecont ur map prepared frowatr flow to the northeast wm he Augusttan average1, 1991,gradietd to is included as Figure 4. per foot A <br /> Delta Delivers SOtUtiOns <br />