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iQuarterly Report - Second Quarter 2001 <br /> Den's Auto Repair <br />' 308 South El Dorado Street, Stockton, California <br /> II.Q. INTRODUCTION <br /> , <br />' In accordance with the request of Mr Den Ueda, Advanced GeoEnvironmentai, 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 Preliminary Investigation and Evaluation Report (PIER), dated September <br /> I1997 <br /> 2.0. PROCEDURES <br /> • On 09 April 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 SanJoaquin 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 MONITORING WELL PURGE PROCEDURES <br /> On 09 April 2001, depths to ground water were measured in each well from the tops of the well <br /> casings at the site to the nearest 0 01-foot utilizing a Solxnst water level meter (Table 1) After <br /> ground water depth measurements were collected, each monitoring well was purged using a two- <br /> stage submersible pump A minimum of 3 casing-water volumes of water were evacuated from each <br /> well casing <br /> Temperature, PH and conductivity of the purging water were measured at regular purge-volume <br /> , <br /> I intervals using a Oakton water analyzer Stabilization data and field logs are included in <br /> Appendix A Purged water was stored in 55-gallon drums temporarily on-site <br /> Advanced GeoEnvironmental,Inc <br /> I <br />