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unaergrouna storage ranK xemovai ana son ever excavation rroject <br /> Shell Service Station <br /> 3011 Benjamin Holt Drive <br /> Stockton, California <br /> Site Background <br /> The site is located at the northwest corner of the intersection of Benjamin Holt Drive and Interstate 5 in a <br /> commercial area of Stockton, California. The site has been operated as a Shell service station with the existing <br /> underground storage tanks (USTs) since 1974. The site is presently an active service station with a layout <br /> including a station building, a waste oil tank, two dispenser islands, and three underground fuel storage tanks <br /> (USTs). <br /> Previous environmental investigation activities have included installation four ground water monitoring wells in <br /> August 1988, abandonment of these wells in 1989, drilling of 10 soil borings in January 1990 in preparation for a <br /> proposed tank replacement project, and installation of three ground water monitoring wells in January 1994. <br /> Quarterly ground water monitoring and sampling are performed and results reported to the SJCEHD <br /> Scope of Work for Current Underground Storage Tank Removal and Over-excavation Project <br /> The current project includes removal of the three existing USTs and associated product piping, and replacement <br /> with two double-wall fiberglass USTs and double-wall fiberglass product piping. This work is performed to <br /> upgrade the USTs and piping system to comply with construction standards required by 1998. <br /> The USTs will be uncovered and rinsed, and flammable vapors will be rendered inert. The tanks will be removed <br /> and loaded onto trucks for removal from the site. <br /> Tank and Rinsate Hauler: Destination of Tank Rinsate: Destination of Tanks: <br /> Crosby and Overton, Inc. Romic Erickson, Inc. <br /> Ph. 1-800-821-0424 Ph. 415-324-1638 Ph. 510-235-1393 <br /> During the project, soil and ground water samples will be collected from beneath the USTs and product lines per <br /> State of California requirements. <br /> If petroleum hydrocarbons are detected in soil samples collected from beneath the USTs or product piping, over- <br /> excavation of soils may be performed. The worst-case estimate of the total soil volume to be generated is 5328 <br /> cubic yards. It is anticipated that the actual volume of soil will be significantly less than this quantity. <br /> Soils excavated from the tank pit and product line trenches, and any potential over-excavation soils will be <br /> stockpiled on-site. After appropriate sampling is performed, the soil will be transported to Forward Landfill for <br /> disposal. Soil hauling will be performed by Manley and Sons Trucking. Any ground water removed from the <br /> excavation will be transported to Shell's Martinez Manufacturing Complex in vacuum trucks provided by <br /> Allwaste. <br /> After removal of the USTs, existing product piping, and soil, new USTs and product lines will be installed. <br /> This project is scheduled to begin on October 21, 1996, and be completed by December 16, 1996. The corrective <br /> action and soil removal phase is scheduled to be completed by November 8, 1996, followed by installation of the <br /> new USTs and lines, and completion of construction. <br /> Site Status at Completion of Project <br /> Upon completion of the project, the site will re-open as a Shell service station. The UST and piping systems will <br /> have been upgraded to meet standards required by 1998. <br />