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E <br /> 3330 Data D.Ive <br /> Suite 100 <br /> Rdr,Ct?G Cordova,CA 95570 <br /> 915 9352085 <br /> IRN,66. <br /> VAX:9iU 638-8385 <br /> EnLironsncnta! <br /> consultants,Inc. <br /> December 13, 1991 <br /> lyls. Linda Turkatte <br /> Departtnet►t of Envirotunental Health <br /> San Joaquin County Public Health Services 2-. , ((p � <br /> P.O.Box 2009 <br /> Stockton,California 95201 <br /> Subject: Quarterly'round Water Sampling Results <br /> 620 West Charter Wayt Stockton, California <br /> Shell WIC No. 204-7524-4305 <br /> Delta Projtct No.40'88-586 <br /> Dear Ms.Turkcatte: n to o)ndact an <br /> 1' Delta Environmental Consultants, lnc., hasservice <br /> been authorized by Shell Oil Company <br /> cl!»ract:rize the <br /> round water conditions at The ilnvestigation tionis intendedlocated aw 20 West r <br /> investigation of soil and g 1 and ). the trite. �`nis <br /> Way, Stockton, California, (Figures round water beneath and adjacent to 1 tbrouglt <br /> distribution of pe;�seuquanenrly aen�aunld twate g Sampling activities from August <br /> report summarizes <br /> November , 1991. ement of uu;er levels <br /> l991,included mem h diorarbons or <br /> Quarterly ground water sampling conducted on Octofor the presence of free-phase onitoring well <br /> in the ten existing monitoring wells, checking <br /> ound water samples for chemical analye's• ;^ <br /> hydrocarbon sheen, and collection of gr Procedures '} <br /> could not be accessed on October 30;consequently,a water level measurement and simple were <br /> MW-2 co performed in accordance with�e p <br /> not obtained until November 15. All Held activities were pe <br /> described in Enclosure A. <br /> r I! r d i n <br /> 1 h F1 w Dir ti 11111111 <br /> in H along with <br /> 1 measurements recorded on October 30, 19911 are compiled in Table 1, <br /> 1991, depth w ground water is the <br /> Ground water leve de, Historic ground <br /> previous grour.,i water level measurements. On OctoLe X010)feet below icalky <br /> ed from e3sul (?hI to 38.1 ( g and MV-9, are: graph <br /> monitoring welis rang Welts MW-1, MW-5, MW-6, MW- <br /> 1 g,3;indicate <br /> water elevations in monitoring <br /> illustrated in Figure 3. The ground water level measurements recorded t generally <br /> nralOctober t1e1I to the north <br /> that the direction of shallow ground�'ater flow varies across the site, 0.l. A water table contour map <br /> and northeast, Horizontal gradients range from approximately 0.02 to <br /> ctoheer 30, 1991, data is included as Figure 4. <br /> prepared from the O <br /> °s <br /> k <br /> t <br /> Della Delivers SOIulions <br />