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11369 NORTH HIGHWO 99 • <br /> Project No 1001 <br /> August 28, 1997 <br /> Page 3 <br /> Excavation of the contaminated soils began on March 30, 1995, to depths ranging between 15 <br /> and 17 feet by T & T Trucking Approximately 250 cubic yards of soil were removed and <br /> stockpiled on and covered with plastic WKA collected a total of 10 sidewall and bottom <br /> samples (EX1 through EX10) from the excavation on June 12, 1995, at the locations shown on <br /> Figure 2 Test results of soil samples revealed no detectable concentration of TPH as gasoline <br />' or BTEX along the excavation sidewalls at a depth of nine feet below grade, nor in samples <br /> collected from beneath the tank at a depth of 15 feet below grade Visual and olfactory <br /> observations at the time of excavation indicated the presence of petroleum hydrocarbons along <br />' the southern sidewail The excavation was subsequently backfilled to surface grade with <br /> stockpiled soil that tested clean (Table 1) <br /> 1 <br /> In early September 1995, an estimated 50 cubic yards of soil was excavated by T & T <br /> Trucking south of the former UST excavation The excavated soil was stockpiled on and <br /> covered with plastic A total of six bottom samples (EX 11 through EX 16) were collected by <br /> WKA from the new excavation on September 5, 1995 Test results revealed trace <br /> concentrations of petroleum hydrocarbons only in samples EX13, EX14, and EX16 The <br /> i excavation was backfilled and compacted on December 8, 1995, using the clean stockpiled <br /> soil <br /> 1 <br /> FIELD INVESTIGATION <br /> 1 <br /> Our field investigation was conducted during the last week of November and the first week of <br />' December, 1995 A chronological summary of our investigation follows <br />' On November 27 and 28, 1995, rune soil borings (B1 through B9) were advanced around the <br /> perimeter of the former UST at the locations depicted on Figure 3, using a direct push <br /> i sampling device (Geoprobe) provided and operated by Vironex The borings were pushed to <br /> maximum depths ranging from 18 to 43 feet below grade Petroleum hydrocarbon odor was <br /> detected in soil samples collected from borings B2, B4, B7, B8 and B9 A total of 25 soil <br /> isamples were submitted to the laboratory and analyzed for TPH as gasoline using EPA method <br /> i <br /> 1 <br />