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0 0 3.0 UNDERGROUND STORAGE TANK CLOSURE PROGRAM • The underground storage tank closure program involved a five step process including: (1) Tank Closure Permitting, (2) Tank System Removal and Disposal, (3) Soil Sampling, (4) Laboratory Analysis, and (5) Backfilling and Resurfacing the Excavation. Each element is described in the following sections. 3.1 TANK CLOSURE PERMITTING On November 8, 1997, Wayne Perry,Inc.'s subcontractor H.B. Covey submitted an Underground Storage Tank closure Permit to the City of Stockton Fire Prevention Division and was issued permit#97-329. On December 17, 1997,H.B. Covey also submitted an application for tank closure to the San Joaquin County Public Health Services-Environmental Health Division notifying the county of an underground storage tank removal and closure program. Copies of the permits are included in Appendix A. 3.2 TANK SYSTEM REMOVAL AND DISPOSAL On December 15 through 19, 1997, H. B. Covey utilized a Case (Model 680L) backhoe to remove the concrete surface cover and exposed the top of the underground storage tanks and piping. During excavation, the soil removed from the excavation(and temporarily stockpiled near the excavation)was monitored using a photoionization detector. On December 18, 1997, Oil Conservation Services of Fresno,California,under subcontract to Wayne Perry, Inc.and H.B.Covey,rinsed and purged the underground diesel fuel tank in accordance with applicable State and local regulations. The tank did not require certification for removal by a marine chemist. The tanks were transported to Foothill Sanitary Landfill in Lindon, California for disposal. A copy of the rinse/purge documentation and transportation manifest are presented in Appendix B. On December 19, 1997, prior to removal of the tank, a representative from the City of Stockton Fire Department-Fire Prevention Division issued approval to remove the tanks using a crane. The tanks were partially destroyed on-site,then loaded onto a transport trailers,properly secured,and transported to Foothill Sanitary Landfill. The certificate of tank destruction is included in Appendix C. Concurrent with the tank removal program, H.B. Covey removed the product dispenser island, product piping,and vent piping from the site. The dispenser island was positioned approximately 10 feet to the south of the former underground storage tanks. The vent lines were located northwest of the former diesel fuel • 4