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<br /> AUG 27i�+r3f3330 Oa1a[}rive
<br /> ADelta 7331 sa to 100
<br /> Sacramento,CR 95670
<br /> Environmental F�1�FU'-'INIENTAi_HEALTH 916639L2085
<br /> Knsultants,Inc. �y,'':ry iY
<br /> PE"' �l 1 R s��,ERVICrJ FAX:916'6388395
<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 Water 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 Na.40-88-586
<br /> Dear Ms.Turkatte:
<br /> Delta Environmental Consu;tants, Inc., has I-en 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 1 and 2). The investigation is intended to characterize the
<br /> distribution of petroleum constituents in soi!and ground water beneath and adjacent to the:ite. This
<br /> letter report summarizes site activities from May I through August 1, 1991,including quarterly,round
<br /> water sampling and installation of an off-site grrund water monitoring well.
<br /> Quarterly ground water satt�pli:,g'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 analyis. Installation of monitoringww"W ijrT,.
<br /> intended to help assess the down3radient extent of petroleum hydrocarbon constituents in ground water,
<br /> was performed on July 25, 1991. Water levels n the monitoring wells were measured again, and a
<br /> ground water sample was collected from monitoring well MW-SO on August 1, 1991. All field activities
<br /> were performers in accorQanv�-.whh the procedures described in Enclosure A-
<br /> Wnt.r Level Depth. Flow Direcllon,and li,(Injillir Crudlent
<br /> Ground water level measurements recorded on July 23 and August 1,1991,arc compiled in Table 1,with
<br /> previous ground water level mcasur.ments. On August 1, 1991,depth to ground water in the monitoring
<br /> wells ranged from 30,27(IviW-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 /> ground water flow to the northeast with an average gradient of approximately 0,02-foot per foot. A
<br /> water table contour map prepared from the August 1, 1991,data is included as Figure 4.
<br /> J
<br /> Delta Delivers Solutions
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