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ALTON <br /> GE®SCIENCE 1�, r 91 T.L.H. <br /> THE RESULTS TEAM u 1 u <br /> December 13, 1991 <br /> Mr. Clint Rogers <br /> Chevron U.S.A., Inc. <br /> Post Office Box 5004 31U-308 <br /> San Ramon, California 94583-08O4 <br /> Subject: Quarterly Ground Water Monitoring Report <br /> Chevron Station No. 9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California <br /> Dear Mr. Rogers: <br /> in accordance with our agreement, Alton Geoscience transmitfor <br /> this Quarterly Ground Water Monitoring and Sampling Report <br /> Chevron Station No. 9-4275, 2905 West Benjamin Holt Drive, i <br /> Stockton, California. Figure 1 shows the site location. <br /> Mo,:itoring and sampling of the ground water monitoring wells <br /> was performed on October 31, 1991, in accordance with the <br /> requirements and procedures of the California Regional Water <br /> Quality Control Board (R°�iQCB) and local regulatory agencies. ; <br /> S <br /> FIELD PROCEDURES <br /> Prior to purging and sampling the wells, each well was checked <br /> for liquid-phase hydrocarbons or sheen. °The depth to ground u <br /> red in each well <br /> water and, if present, free product was measu <br /> from the top of casing using an electronic interface probe <br /> with 0.01 foot tolerance. <br /> Ground water samples were <br /> collected after more than 3 casing <br /> volumes of ground water was purged from each we11. Each <br /> samper <br /> le was collected using a clean bailrr' Grouclean nd tsample <br /> samples were then decanted into the appropriate <br /> containers for delivery to a California-certified laboratory <br /> following proper preservation and chain of custody procedures. <br /> Purged ground water was stored onsite in DOT-approved, <br /> 55-gallon drums pending removal by Erickson Inc. , a licensed <br /> hauler. The purged ground water was transported e l <br /> non-hazardous to Gibson Oil/ Pilot Petroleum of Redwood City, <br /> California for recycling. <br /> 3 <br /> s <br /> 1000 Burnett Aveme,Sude 140 <br /> 0mrd.cailornia M520 - <br /> . - - {415)bU.J582•FAX(415)682$921 <br />