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� �a^3�� "r: `mom r " d; ..��c.:. <br /> � ..��.a _ -� ',7. l"��+r.e 'u :7" `tia's3^ ;s,Y, <br /> 'e; ;a,,.- -•x„ - �z <br /> I � <br /> -- ? ::- GROUNDWATER <br /> v <br /> TECHNOLOGY, INC. Mol IlalyadN%c.Suite NO.%V"-ttiacramentu.CA95,691.1911,43i3471A1 <br /> FAX 191613,2-8781 <br /> December 11, 1991 Project No. 023:0 1940 <br /> Mr. R. R. Zielinski <br /> Texaco Environmental Services <br /> 108 Cutting Boulevard <br /> Richmond, CA 94804 111 <br /> R f F�,� D <br /> RE: QUARTERLY STATUS REP0RT IR-5 of 91) DEC 2 7 1931 <br /> TEXACO SERVICE STATION ENVIRONMENTAL HEALTH <br /> 440 WEST CHARTER WAY PERMIT/SERVICES <br /> STOCKTON,CALIFORNIA <br /> Dear Mr.Zielinski. <br /> This letter is presented as a quarterly report on groundwater conditions at the site referenced above <br /> for the quarter of September through November 1991. Groundwater monitoring and sampling were <br /> conducted to determine water table elevation, the thickness of any separate-phase petroleum <br /> hydrocarbons ISP),and the distribution of aissolved hydrocarbons in the 11 monitoring wells (MWs) <br /> at this site. Groundwater monitoring data and results of laboratory analyses of groundwater samples <br /> collected on November 6, 1991, are included. <br /> NX WORK PERFORMED <br /> GROUNDWATER MONITORING <br /> On November 6, 1991, water table elevations at the site were an average of 0.84 foot lower than <br /> levels reported the previous quarter. The estimated flow direction of the groundwater is divergent from <br /> MW-2 to the northeast. Figure 1 (Attachment AI is a potentiometric surface map constructed from <br /> the November 6, 1991 monitoring data. Table 1 {Attachment B€ presents a cumulative summary of <br /> the most recent and four preceding quarterly monitoring events. <br /> GROUNDWATER SAMPLING <br /> Prior to water-sampla collection, the groundwater monitoring wells were purged of 4-10 casing <br /> volumes and allowed to recharge with representative formation water. A U.S. Environmental <br /> Protection Agency (EPA?-approved Teflon'sampler, cleaned with an industrial detergent and distilled <br /> .eater, was used for the groundwater sampling. The water samples were then transferred to 40- <br /> rnOiliter gl ss vials with Teflon"-septum caps,preserved on ice,and transported to GTEL Environmenta=l <br /> Laboratories, Inc. IGTEL), in Concord, Califorals, accompanied by a chain-of-custody manifest. <br />