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� , r <br /> r <br />' Quarterly Report - December 1999 <br /> . Den's Auto Repair " <br />' 308 South El Dorado Street, Stockton, California ' <br />' lA. INTRODUCTION <br /> In accordance with the request of Mr Den Ueda, Advanced,GeoEnvironmental, Inc (AGE) has n <br /> Iprepared this Quarterly Report for Den's Auto Repair at 308 South EI 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 strictures 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 /> - <br /> Preliminary Investigation and Evaluation Report (PIER) dated September 1997, prepared by AGE <br /> 2.0. PROCEDURES <br /> IThe work was performed In accordance with 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 Investigation Work Plan prepared by AGE, dated 05 <br /> February 1996 <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> I On 30 December 1999 ground to depths water were measured in each well from the tops of the well <br /> P to p <br /> casings at the site to the nearest 0 01 foot utilizing a Solinst water level meter (Table 1) After <br /> rground water depth measurements were collected, each monitoring well was purged using a two- <br /> stage submersible pump A minimum of 3 well volumes of water were evacuated from,each well <br /> � 4 <br /> Icasing <br /> Temperature, pH and conductivity of the purging water were measured at regular purge-volume <br /> I intervals using a Hydac Water Analyzer Stabilization data and field logs are included in Appendix <br /> A Purged water was stored in 55-gallon drums temporarily on-site <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> r <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 /> hydrochloric acid(18%)as a preservative The samples were transported in a chilled container,under <br /> i <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />