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Report <br /> Buffalo Tank Corporation <br /> July 15, 1993 <br /> Page -S- <br /> and T1 at 18 feet were placed on hold pending the laboratory <br /> results of the remaining excavation samples . <br /> 3.0 Laboratory Analyses <br /> Five (5) soil samples collected from the excavation were <br /> selected for laboratory analyses . The samples were analyzed for <br /> benzene, toluene, ethyl benzene, and total xylene (BTEX) by EPA <br /> Method 8020, for total petroleum hydrocarbons, quantified as <br /> gasoline (TPH-G) by Method 5030/LUFT, and for total extractable <br /> petroleum hydrocarbons, quantified as diesel, motor oil, <br /> kerosene, and mineral spirits (TEPH) by Method 3550/LUFT. See <br /> Table 1 below for laboratory results . <br /> TABLE 1 <br /> Laboratory Results <br /> Over-Excavation (6/15/93) <br /> B T E X TPH-G TEPH <br /> Detection 5.0 5.0 5.0 5.0 2.5 5.0-50 <br /> Sample I.D. Limits: pg/kq pg/kg pg/kg pg/kg mg/kg mg/kg <br /> 675-T2S-17' ND ND ND ND ND ND <br /> 675-Tank1C-171/2' r ND ND 120000 6900000 ND 11000* <br /> 675-TIW-20I ND 160 69 1500 ND ND <br /> 675-TanklE-211/2' ND 100000 13000 410000 ND 1300* <br /> 675-Tank2C-22' 9 ND 15000 3100 110000 ND 1400* <br /> unit Convers ons: <br /> Pg/kg:parts per billion (ppb) B,T,E,X - benzene, toluene, ethyl benzene, and xylene. <br /> mg/kg:parts per million (ppm) TPH-G - total petroleum hydrocarbons, quantified as gasoline. <br /> TEPH - total extractable petroleum hydrocarbons, quantified as <br /> diesel, oil, kerosene, and mineral spirits. <br /> ND none detected at or above laboratory detection limit. <br /> TEPH - mineral spirits (paint thinner). <br /> Y detection limits raised due to elevated concentrations <br /> of hydrocarbon. <br /> The results of the laboratory analyses indicate that BTEX <br /> constituents and TEPH (mineral spirits) were detected in the soil <br /> beneath the former locations of tanks T1 and T2 at depths ranging <br /> from 17 . 5 to 22 feet. 11,000 mg/kg mineral spirits and BTEX <br /> concentrations up to 6, 900,000 µg/kg (xylene) were detected in <br /> the sample collected beneath the former location of T1 at a depth <br /> of 17 . 5 feet. 1, 300 mg/kg mineral spirits and BTEX <br /> concentrations up to 410, 000 pg/kg (xylene) were detected beneath <br /> the east end of T1 at a depth of 21.5 feet. 1,400 mg/kg mineral <br /> spirits and BTEX concentrations up to 110, 000 µg/kg (xylene) were <br /> detected beneath the former location of T2 at a depth of 22 feet. <br /> Nuw <br /> CONDOR <br />