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HOLGLJIN, FAHAN & ASSOCIATES, INC. <br /> ENVIRONMENTAL MANAGEMENT CONSULTANTS <br /> August 17, 2009 <br /> Hr, Epffilo <br /> 'r <br /> Mr. Michael J. Infurna AUG 1 g L009 <br /> Senior Registered Environmental Health Specialist <br /> San Joaquin County Environmental Health Department ENVIp,0NJJT E Rv CSS H <br /> 600 East Main Street pER� <br /> Stockton, California 95202 p <br /> Subject: WORK PLAN ADDENDUM FOR WELL DESTRUCTION <br /> CHEVRON PRODUCTS COMPANY SERVICE STATION #96171 <br /> 6633 PACIFIC AVENUE, STOCKTON, CALIFORNIA <br /> (SJCEHD CASE #1784, CRWQCB-CVR CASE #390054) <br /> Dear Mr. Infurna: <br /> On behalf of Chevron Environmental Management Company (Chevron EMC), Holguin, Fahan & <br /> Associates, Inc. (HFA) has prepared this work plan addendum for well destruction for the <br /> above-referenced site (Site). Previously, a work plan for well destruction dated May 29, 2009, a <br /> revised work plan for well destruction dated June 18, 2009, and a work plan addendum for well <br /> destruction dated August 12, 2009, were submitted for the Site. <br /> Based on conditions observed in the field during the geophysical survey and hole clearance <br /> activities, the previously approved well destruction method of complete overdrill is not <br /> appropriate for all wells. HFA recommends abandoning the following wells by pressure grouting <br /> utilizing the procedure outlined in the work plan addendum dated August 12, 2009. <br /> • MW-4: two polyvinyl chloride (PVC) conduits were encountered within 6 inches of the well <br /> casing during hole clearance activities. These PVC conduits most likely supply electricity and <br /> water to the site's air and water station. Use of rotating equipment in close proximity to <br /> these facilities would present an unacceptable safety risk. As such, pressure grouting is <br /> recommended for abandonment of well MW-4. <br /> • MW-8: an unknown fiberglass line was encountered within 6 inches of the well casing during <br /> hole clearance activities. Use of rotating equipment in close proximity to this line would <br /> present an unacceptable safety and environmental risk. As such, pressure grouting is <br /> recommended for abandonment of well MW-8. <br /> • MW-10: during the geophysical investigation, an electrical line was identified within 1 foot of <br /> the wellbox. Additionally, the wellbox is within 7 feet of the surface expression of the Site's <br /> current-generation USTs. Use of rotating equipment in close proximity to these facilities would <br /> ENVIRONMENTAL SCIENTISTS GEOLOGISTS ENGINEERS <br /> Contaminated Site Assessment • Fixed & Mobile Remediation • Project & Program Management <br /> Ventura, CA Pleasanton, CA Redlands, CA Tempe, AZ Flagstaff,AZ <br /> 805641-1056 800-672-0219 909-793-4571 480-5053332 928-779-5447 <br /> http://www.hfa.com <br />