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• 09 May 2002 AGE-NC Project No 96-0232 Page 2 of 18 In letters dated 08 August and 07 November 2001, the RWQCB directed that off-site and deeper MTBE-impacted ground water related to Flag City Chevron be addressed AGE submitted an addendum to the FRP, dated 07 December 2001, for off-site ground water extraction in First Zone ground water in the area near Rocky's Restaurant well RDW-1 However, in a letter dated 28 February 2002, the RWQCB denied AGE's proposal for off-site ground water extraction in First Zone ground water and stated that the area west of well MW-7 should be investigated and that in-situ remedial methods(ozone sparging and biosparging)should be evaluated prior to implementing off- site remediation In accordance with the RWQCB's request,a work plan is included with this report in Appendix A to further assess the area west of well MW-7,to assess the area north and east of well MW-8 and to evaluate ozone sparging and ground water extraction in Second Zone and Rocky's Upper Zone ground water in the area near the former well RDW-1 2.0. ROCKY'S RESTAURANT DOMESTIC WATER WELL ABANDONMENT On 26 March 2002,the domestic water well RDW-1 at Rocky's Restaurant was abandoned utilizing blast perforation and casing ripping techniques under permit and supervision of the San Joaquin . County Environmental Health Department(SJCEHD) Water well abandonment procedures for well RDW-1 were outlined in Domestic Water Well Abandonment Work Plan, dated 21 September 2001 and in Revision to Domestic Water Well Abandonment Work Plan, dated 26 November 2001, prepared by AGE and approved by the RWQCB by letter dated 29 November 2001 Well abandonment activities were performed by Water Well Technology Inc and Clark Wells Inc under the direct supervision of the SJCEHD and documented by representatives of AGE and the RWQCB In preparation for well abandonment, the water well submersible pump, well cover box and cement pad were removed from the area, a six-foot wide by four-foot deep area was excavated around the RDW-1 well casing, and the well casing was cut from surface grade to approximately 3 feet bsg Explosive charges and projectiles (chrome-alloy steel round bullets) were attached to an explosive cord at approximately 5-foot intervals and lowered into the well The explosive cord was extended down the well to total depth of the well at approximately 144 feet bsg The well was filled to surface grade with neat cement utilizing a tremie pipe, and the charges were detonated Perforations introduced into the well casing by the projectiles and explosive cord provided pathways for the cement to fill voids and cavities extending into the formation Following detonation, additional neat cement was introduced into the well to approximately 3 feet bsg • Advanced GeoEnvironmental,Inc