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C; <br /> I� v Quarterly Re ort - Second Quarter 2003 <br /> DEN'S AUTO REPAIR <br /> I308 South El Dorado Street, Stockton, California <br /> 10 INTRODUCTION <br /> I At the request 'f 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 /> Background information, including details of previous site assessment work, is presented in <br /> Appendix A <br /> 2.0. PROCEDURES <br /> On 21 May 2003 ground water monitoring and sampling were performed on all wells at the site,the _ l <br /> Y , �' g p g <br /> work was performed in accordance with Central Valley Regional Water Quality Control Board F <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 monitonng 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 Sollnst water level meter (Table 1) After ground water depth <br /> measurements were collected, the shallow monitoring wells were purged of approximately 3 to 9 <br /> gallons of vciater(a minimum of three casing-water volumes),using a dedicated,disposal bailer The <br /> deep monitoring wells were purged of approximately 18 and 18 5 gallons of water(a minimum of <br /> three casing-water volumes) utilizing dedicated polyethylene foot-bailers and a Waterra pump <br /> Temperature, pH and conductivity of the purging water were measured at regular purge-volurne <br /> intervals using an Oakton water analyzer Stabilization data and field logs are Included in <br /> Appendix B Purged water was stored In 55-gallon drums temporarily on-site <br /> IAdvanced GeoEnvirenmental,Inc <br /> I <br />