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�r Adwinced Geo E nviron mental , Inc * 19 April 2006 AGE-NC Project No. 99-0645 Ms. Margaret Lagorio San Joaquin County Environmental Health Department 304 East Weber Avenue. 3`d Floor Stockton, CA 95202 Subject: Work Plan for Well Destruction Former MEL BOKIDES PETROLEUM - Linden 8203 East Highway 26, Stockton, CA Dear Ms. Lagorio: At the request of Mr. Mel Bolides of Mel Bokides Petroleum, Inc., and as directed by San Joaquin County Environmental Health Department (EHD) in a letter dated 28 March 2006. Advanced GeoEnvironmental, Inc. (AGE)has prepared this work plan for the destruction of ground water and vapor wells at 8203 East Highway 26. in Stockton, California. The above-referenced letter is included as Appendix A; location of the site is illustrated in Figure 1; site structures and monitoring well locations are depicted on Figure 2. Also enclosed with this work plan is a well destruction permit and the associated well destruction permit fee. INTRODUCTIONBACKGROUND To date, a total of four groundwater monitoring wells (MW-1, MW-I R, MW-2, MW-3) and four vapor extraction wells (VW-1A, VW-113, VW-2, VW-3) have been advanced onsite. On 27 September 2002, monitoring well MW-1 was destroyed by drilling out the entire boring length and backfilling with neat cement and bentonite in the upper 15 feet of the excavation. Additionally, the domestic on-site well was destroyed by percussion explosion and backfilled with a sand and cement mix. Based on previous site assessments, and as detailed in the AGE-prepared Closure Summary Report dated 19 December 2005 (CSR),the majority of petroleum hydrocarbon-impacted soil appears to be limited to the west end and, to a lesser extent, the north end of the former UST area. The highest petroleum hydrocarbon concentrations in soil,namely TPH-g,were detected in samples TI-N-15 and WW. collected in May 1999 and March 2000, respectively.