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1 <br /> + I <br /> Quarterly Report- November 1998 <br /> lip Den's Auto Repair - <br /> 308 South El Dorado Street, Stockton, California <br /> P 1 , <br /> 1.0. INTRODUCTION' <br /> I 4 ; ti " x w ' r F `T t o <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 the collection and analysis of ground water samples from <br /> three dual-completed ground water monitoring wells The site and its surroundings are illustrated <br /> on Figure I Locations of structures and monitoring wells on the site are illustrated on Figure 2 <br /> I ' <br /> Background information including details of,previous site assessment work, was presented in the <br /> Preliminary Investigation and Evaluation Report (PIER) dated September 1997, prepared by AGE <br /> 1 M <br /> 2.0. PROCEDURES <br /> I r <br /> The work was performed in accordance u ith San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board guidelines for investigation of underground storage tank (UST)sites and was conducted as <br /> described in the PHS-EHD approved Site Im estigation Work Plan prepared by AGE, dated 05 <br />' February 1996 <br />' 21 MONITORING WELL PURGE PROCEDURES _ <br /> On 20 November 1998, a Solinst water,level' meter was used to measure the depth to ground water <br /> in each well relative to the tops of the well casings After ground water depth,measurements were <br /> collected, each monitoring well was purged using a two-stage submersible pump A minimum of 3 <br /> t , <br /> well volumes of water were evacuated from the well casings <br /> Temperature, pH and conductivity of the purging water were measured at regular intervals, as <br />' appropriate, using an ICM Model 52200 Water Analyzer to monitor these ground water parameters <br /> for stabilization Stabilization data and field-logs are included in Appendix A Purged water was <br /> stored in 55-gallon drums temporarily on-site , <br /> 22 -COLLECTION AND ANALYSIS OF GROUNDWATER SAMPLES <br /> Water samples were collected froinn 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 /> hydrochloric acid(18%)as a preservative The samples were transported in a chilled container, under <br /> chain of custody, to McCampbell Analytical Inc (MAI), a State of California Department of Health <br /> Adianced CeoEnN iron mental,Inc <br /> f <br />