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CAMBRIA <br /> Onsite Abandoned Water Well: On August 7, 2002 the abandoned water supply well at the <br /> subject site was redeveloped and video logged. Gregg Drilling and Testing, Inc. of Martinez, <br /> California was on site to redevelop the well_ Well redevelopment consisted of bailing, surge- <br /> blocking, and purging the water from the well. Approximately 550 gallons of water was <br /> removed from the well during development activities. This water was pumped into a vacuum <br /> truck which was onsite that day to perform GWE from well MW-IA. <br /> Water Well Technology, Inc. of Fair Oaks, California provided the video logging services. <br /> During video logging activities the well was found to be approximately 115 feet deep. <br /> Groundwater was encountered in the well at seven feet below grade (fbg). The well casing is <br /> steel and six inches in diameter. Perforations in the casing consisted of vertical slots between <br /> 107 and 115 fbg. The video log report is included in Appendix C. <br /> Cambria discussed how this well should be destroyed with San Joaquin County Environmental <br /> Health Department (EHD). EHD is requesting the steel casing be perforated prior to pressure <br /> grouting the well. Cambria will contact driller companies to determine the appropriate method <br /> for perforating this well. Once we have selected a drilling company to destroy the well we will <br /> submit an application to EHD for destruction of this well. <br /> ANTICIPATED FOURTH QUARTER 2002 ACTIVITIES <br /> Groundwater Monitoring: Blaine will gauge and sample the site wells according to the existing ►: <br /> sampling schedule and tabulate the data. Cambria will prepare a groundwater monitoring report. <br /> Groundwater Remediation: GWE from well MW-IA will continue. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Only well MW-1A reported MTBE at a concentration of 1,400 gg/L, which remains significantly <br /> reduced from MTBE concentrations reported in the first quarter of 2002. It appears that periodic <br /> GWE continues to reduce MTBE concentrations in well MW-IA,in addition to the tank backfill. <br /> Groundwater flow direction was to the northeast this quarter,as is typical for the site. <br /> 0813 2 <br />