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1 <br /> Inc to Erickson, Inc in Richmond, California (Appendix A, Photo 7) The tank was destroyed by <br /> Erickson, Inc by cutting it open and processing it The certificate of destruction is included in <br /> Appendix B The excavated soil was stockpiled on visqueen, adjacent to Building 917, west of the <br /> ! excavation and Building 817B (Appendix A, Photo 5) Approximately 45 cubic yards of stockpiled <br /> soil was covered with visqueen after completion of the field activities on April 20, 1992 (Appendix <br /> 1 A, Photo 6) Asphalt pavement was stockpiled in a separate pile to the south of the excavated soil to <br /> the west of the excavation The associated piping that was removed from the tank excavation was <br /> ! placed with the excavated soil All piping that was not removed was capped at the sides of the <br /> excavation Currently, an eight-foot high chain link fence surrounds the stockpiled soil, asphalt, and <br /> 1 associated piping that were removed from the tank excavation (Appendix A, Photo 9) <br /> ! After removal of the tank and associated piping, the following materials were observed in a <br /> cross section of the tank excavation pit sidewall The uppermost 14 inches of material consisted of <br /> asphalt underlain by aggregate base course Below the base course, to a depth of approximately <br /> ! seven feet, fill materials were horizontally variable The eastern on-third of the sidewall consisted of <br /> medium sand, gravel, and cobbles to four inches in diameter The central portion of the sidewall <br /> consisted of well graded fill sand and the western portion of the sidewall consisted mainly of sandy <br /> clay with some well graded fill sand The excavation pit was terminated at seven feet because of the <br /> ' presence of a concrete slab <br /> Approximately 25 dime-sized (15 millimeter diameter) holes were observed along the bottom <br /> of the tank at the time of its removal A significant amount of rust was observed on all exterior areas <br /> 1 of the tank The soil in the excavation pit showed signs of historic leakage from the tank and <br /> associated piping around the tank, including soil staining and PID readings exceeding 500 ppm <br /> 1 A total of three soil samples were collected during tank removal activities Two soil samples <br /> ! were collected from the excavation sidewalls, one from each end of the UST, and one sample was <br /> collected from under the product supply piping Soil samples were collected by PRC personnel at the <br /> locations shown on Figure 3 The two soil samples from the UST excavation pit were collected on <br /> April 20, 1992 This was accomplished by driving a 2-inch (inside diameter) by 6-inch long brass <br /> ! liner into soil removed from the excavation pit by backhoe bucket Sample NCS-3 was collected at a <br /> depth of 6 feet at the west end of the excavation and NCS-4 was collected at a depth of 7 feet at the <br /> TANKRMU NEW <br /> 0"-0I62UPATR[VIVO 7 <br />