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x <br /> s I <br /> i <br /> 1 <br /> • Quarterly Report - Fourth Quarter 2001 <br /> Den's Auto Repair' <br />' 308 South El Dorado Street, Stockton, California ' <br /> T <br />' 1.0. INTRODUCTION <br /> In accordance with the request of Mr Den Ueda, Advanced GeoEnvironmental, Inc (AGE) has <br />' prepared this quarterly report for Den's Auto Repair at 308 South El Dorado Street, Stockton, <br /> California The scope of work included measuring ground water depths and collection and analysis <br /> of ground water samples from three dual-completed ground water monitoring wells The site and its <br />' surroundings are illustrated on Figure 1 Locations of structures and monitoring wells on the site are <br /> illustrated on Figure 2 <br />' Background information, including details of previous site assessment work, was presented in the <br /> AGE's report titled Preluninary Investigation and Evaluation Report (PIER), dated September r <br /> I1997 <br /> 20 PROCEDURES <br /> On 18 October 2001, ground water monitoring and sampling were performed at the site on all wells <br /> • Ground water monitoring procedures for the site were outlined in the PHS-EHD-approved Site <br /> Investigation Work Plan prepared by AGE, dated 05 February 1996, and conform to ground water <br /> monitoring guidelines issued by the San Joaquin County Public Health Services - Environmental <br /> Health Division(PHS-EHD) The work was performed in accordance with Central Valley Regional <br /> Water Quality Control Board guidelines for investigation of underground storage tank(UST) sites <br /> 2'1' WELL MONITORING AND EVACUATION <br /> Depths to ground water were measured in each well from the tops of the well casings at the site to <br /> the nearest 0 01-foof utilizing a Solinst water level meter (Table 1) After ground water depth <br /> measurements were collected, each monitoring well was purged using a two-stage submersible ' <br /> I pump, and/or a dedicated disposal bailer A minimum of 3 casing-water volumes of water were <br /> evacuated from each well casing <br /> Temperature, pH and conductivrty of the purging water were measured at regular purge-volume <br /> 4 <br /> intervals using a Oakton water analyzer Stabilization data and field logs are included in <br /> IAppendix A Purged water was stored in 55-gallon drums temporarily on-site F <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> IAdvanced GeoEnvironmental,Inc <br />