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SECTION 1 <br /> ELIMINARY EVALUATION OF TANK ' <br /> PR , <br /> SITES <br /> of two underground <br /> This workplan has been prepared for the closure gr <br /> storage tanks located in Stockton, California (San Joaquin County) <br /> The tanks are owned by Catellus Development Corporation. The tank <br /> sites lie adjacent to active warehousing facilities at 1325 & 1541 West <br /> Weber Avenue (Figure 1-1). The respective facilities are currently <br />' occupied by Graphic Contractors and General Potato and Onion The <br /> storage tanks are not in use. <br />' Tank Histories <br /> Documentation of the installation and use of the tanks could not be <br /> located. Neither San Joaquin County nor the property owner nor the <br /> lessees have any records regarding the installation date and tank <br /> use. Therefore, size and construction details are unknown. <br /> According to the manager of General Potato and Onion, the tanks <br /> were probably installed when the warehouses were constructed in <br /> the mid-1960s <br /> Prefindmary Tank Survey <br /> Because information was not available regarding the exact location <br /> and size of the underground storage tanks, the tanks were surveyed <br /> on June 19, 1991 by Spectrum Environmental Services. Spectrum <br /> utilized a combination of direct measurement of the tanks and <br /> indirect geophysical techniques Spectrum was able to determine <br /> tank capacity, orientation in the ground, depth, and approximate <br /> amount of remaining product. <br /> The survey indicated that the storage tank at 1325 West Weber <br /> Avenue lies adjacent to the building as depicted in Figure 1-2. The <br /> tank was found to have a capacity of approximately 500 gallons and <br /> has approximately 300 gallons of unknown product remaining in it. <br /> The top of the tank is approximately 3-1/2 feet below the ground <br /> surface and the bottom is at approximately 7-112 feet. <br /> 1-1 <br />