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` I <br />' Quarterly Report - First Quarter 2002 <br /> • DEN'S AUTO REPAIR <br /> I308 South El Dorado Street, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Den Ueda, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br />' quarterly report for Den's Auto Repair at 308 South El Dorado Street, Stockton, California _The <br /> scope of work included conducting ground water monitoring and sampling of three dual-completed <br /> ground water monitoring wells and preparation of this report The site and its surroundings are <br />' illustrated on Figure 1 Locations of structures and monitoring wells on the site are illustrated on <br /> Figure 2 <br /> rBackground 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 />' 1997 <br /> 2.0. PROCEDURES <br /> On 26 February 2002,ground water m6nitonng and sampling were performed on all wells at the site, <br /> 10 the work was performed in accordance with Central Valley Regional Water Quality Control Board <br /> guidelines for investigation of underground storage tank (UST) sites Ground water monitoring <br /> procedures for the site were outlined in the AGE-prepared Site Investigation Work Plan, dated <br /> 05 February 1996, and conform to ground water monitoring guidelines issued by the San Joaquin <br /> County Environmental Health Department (EHD) <br /> 2 1 WELL MONITORING AND EVACUATION <br />' Depths to ground water were measured in each well from the top of the well casing at the site to the <br /> nearest 0 01-foot utilizing a Solinst water level meter (Table 1) After ground water depth <br /> measurements were collected, each monitoring well was purged using a dedicated, disposal bailer <br />' A minimum of 3 casing-water volumes of water were evacuated from each well casing <br /> Temperature, pH and conductivity of the purging water were measured at regular purge-volume <br />' 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 /> I <br /> • <br /> Advanced GcoEnwronnnental,Inc <br />