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Quarterly Report - September 1999 <br /> ' Den's Auto Repair ry <br /> 30$ South El Dorado Street, StocktCalifornia; <br /> on, <br /> i <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr Den Ueda, Advanced GeoEnvironment I, Inc (AGE) has <br /> prepared this Quarterly Report for Den's Auto Repair at 308 South El Dorado Street, Stockton, <br /> prep Q , <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 /> gr prepared b AGE <br /> Prelim:nary Investigation and Evaluation Report (PIER) dated September l 997, p p Y Q <br /> 2.0. PROCEDURES <br /> The work was,performed in accordance with San Joaquin County Public Health Services = <br /> Environmental Health Division (PHS and Central Valley Regional Water Quality Control <br /> onducted as, <br /> Board guidelines for investigation of underground storage tank (UST) <br /> ) sites and was c <br /> by AGE, dated fly <br /> described in the PHS-EHD-approved Site Investigation Work Plan prepared <br /> February 1996 <br /> 1 <br /> Ie <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> r <br /> 1estember 1999,depths to ground water were measured in each well from the tops <br /> Oof the well <br /> On 23 September After <br /> casings at the site to the nearest 0 O1 foot utilizing a Sam alevel, <br /> purged us n? two- <br /> giound water depth measurements were collected, each monitoring <br /> stage submersible pump A minimum of 3 well volumes of water were evacuated from the well <br /> casings r <br /> w <br /> H and conductivity of.the purging water were measured at regular intervals, as <br /> Temperature, p , <br /> appropriate,using an IG,M Model 52200 Water Analyzer to monitor these ground water parameters <br /> or stabilization Stabilization,data and field logs are included in Appendix A Purged water was <br /> for <br /> stored,in 55-gallon drums temporarily on-site <br /> a <br /> 2'2 C4LLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using new disposable'bailers The samples <br /> were transferred into 40-m1 EPA-approved volatile organic analysis(VOA) vials containing 0 5 ml <br /> I 5 <br /> { Advanced GeoEn-,kronmental,Inc <br /> r , 1 <br /> 5 <br /> ! 4 <br />