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4 <br /> I <br /> Page 2 <br /> Underground Storage Tank Report <br /> After receiving an acceptance of an Underground Storage Tank Removal Excavation <br /> Permit from the offices of the San Joaquin County, Public Health Services, <br /> Environmental Health Division, dated December 19, 1998, a permit was issued for the <br /> removal of one 10,000 gallon, diesel fuel, underground storage tank (copies of permits <br /> are included in Appendix B). Tracy Fire Department and Tracy Building Departments <br /> were contacted, but did not participate nor require permits. <br /> Tank product and residual was previously removed and disposed by others previous to the <br /> excavation of the tank by Bowen Construction-Engineering, copy of the Uniform Waste ' <br /> Manifest is included in Appendix B. <br /> On January 17, 1999, Bowen Construction-Engineering mobilized to work site and <br /> commenced on the removal of one single walled, steel, 10,000 gallon, diesel fuel, <br /> underground storage tank. It is the understanding of Bowen Construction-Engineering <br /> that the tank had historically contained diesel fuels and was used for the fueling of on-site <br /> diesel equipment. <br /> A single 1 hp diesel pump, which was used to pump fuel from the UST to equipment on <br /> site, was removed and returned to the owner for future use prior to excavation of the <br /> UST. The tank was buried under a 6" thick concrete slab and 3' of soil overburden and <br /> was located near the west side property line. Location of tank and fuel pump is given in <br /> site plan(Appendix A). <br /> During the removal of the overburden for the tank, no signs of discoloration and or <br /> Petroleum odors were noted. f <br /> Duringthe removal of the overburden under the diesel um there were signs of <br /> pump, g <br /> discoloration's and petroleum odors were noted. Possible signs of an unauthorized release <br /> may be attributed from a leaking product line that was an estimated 25' in length,running <br /> from the top of the tank to a diesel fuel pump cabinet. <br /> L 1 <br /> Excavated soils, an estimated 95 cubic yards, were placed on black 10 mill. visqueen and <br /> covered. At completion of tank removal, the tank pit was an estimated 14' in depth, 32' in <br /> length and 12' in overall width. Tank backfill consisted of medium grained sand, while <br /> the native soils appeared to be sandy clays to medium clays. <br /> i <br />