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<br /> 777 TECHNOLOGY, INC. 1401ftalyarch)rive.Suite 140.WatSatramenta.CA9:ifi91.a910137L1 171.4}
<br /> FAX ORD 37'=-8781
<br /> September 24, 1991 Project No. 02320 0075
<br /> Mr. R. R.Zielinski ,
<br /> f Texaco Environmental Services
<br /> 103 Cutting Boulevard
<br /> Richmond, CA 94QC4
<br /> NE: QUARTERLY STATUS REPORT(R-4 of 91)
<br /> TEXACO SERVICE STATION
<br /> 440 WEST CHARTEfi WAY
<br /> STOCKTON,CALIFORNIA
<br />:d
<br /> Dear Mr. Zielinski:
<br /> This letter is presented as a quarterly report on groundwater conditions at the site referenced above i
<br /> fer the quarter ending August 1991. Groundwater monitoring and sampiinp wure conducted to i
<br /> determine water table elevation, the thickness of any separate-phase petroleum hydrocarbons (SP),
<br /> and the distribution of 6 oolved hydrocaibon.,in the 11 monitcrie,g wells(M Ws)at this site. Ground-
<br /> water monitoring data and results of laborawry analyses of ground--ater samples collected on August
<br /> 9, 1991, are included.
<br /> r WORK eERFORMED
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<br /> GFi6UNDWATER MONITORING
<br /> Water tab?w elevations at the site have decreased an average of 1.23 feet from levels reported Zile
<br />;. previous quarter. The estimated flow direction of the groundwater is divergent front MW-2:o the
<br /> north,west and east. Monitoring results are presented in Figura 1 (Attachment A)and aiong with data
<br /> from the four previous monitoring events Table ) (Attachment B).
<br /> GROUNDWATER SAMPLING
<br /> Prior to vrater-aample collection, the groundwater monitoring wells were purged of 4-10 casting
<br /> volumes and allowed to recharge with representative formation water. A U.S. Envi,onmental
<br /> Protection Agency {EPA)-approved Teflon,sampler, cleaned with an industrial detergent and distilled
<br /> water, was used for' the groundwater sampling. The water samples were then transferred to 40-
<br /> milliliter glass vials with Teflon'-septum caps,preserved on ice,and transported to GTEL Environmental
<br /> LaboratorieP; Inc. (GTELI, in Concord, California, accompanied by a chain-of-custody manifest.
<br /> '' xr The water samples were analyzed using modified EPA methods 5030/802018015, which measure
<br /> concentrations of total petroleum hydrocarbons-as-gasoline ITPH-G), and benzene, toluene,
<br /> Offices,hmr phuat the V).,Canada and 0aneas
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