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4.0 CLOSURE PROCEDURES Wright Environmental Services, Inc. obtained(on behalf of the City of Tracy)the proper permits from the County of San Joaquin Environmental Health Department, and City of Tracy Fire Department for the tank removal(copies can be found attached). The contractor removing the tank is Wright Environmental Services- General Engineering Contractor License#601501 —Class A with Hazardous Certification. (Copy of Licenses attached). If contamination were discovered, a corrective action in accordance with the County of San Joaquin Environmental Health Department and the State Regional Water Quality Control Board would be initiated following the tank removal. Corrective actions at that point would be conducted under an Environmental Restoration Program(ERP)and may include further samples and analyses to determine the nature and extent of subsurface contamination. A corrective action plan and cleanup would be initiated if required by the County of San Joaquin Environmental Health Department or the State Regional Water Quality Control Board. 4.1 TANK REMOVAL AND DISPOSAL The following actions were taken during the tank removal: (ACTIVITIES PERFORMED ON APRIL 9,2004) • USA(Underground Service Alert)was notified 72 hours prior to excavation activities being performed to identify any utilities on site that might be found within the proposed excavation area. • The construction site was barricaded and encompassed with temporary fencing to control pedestrian and vehicular traffic to keep the site clear for construction equipment and activities. • Wright excavated and exposed the product pipelines associated with the entire fueling system and top of tank. • Wright triple rinsed the interior walls of the fuel tank and pipelines and the resultant rinsate generated from cleaning vacuum removed into a 55 gal. Drum and labeled for future transport. (ACTIVITIES PERFORMED ON APRIL 12, 2004) • Wright began excavating surrounding area around the UST's for proper removal and • Wright continued excavating and exposing surface soils and rock surrounding the UST's for removal.