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2 <br /> • <br /> 4 The soil samples from below the former 10,000-gallon wastewater tank (ST-3A, B) and <br /> from S tockpile 3 were analyzed for total extractable petroleum hydrocarbons by EPA Method <br /> 8015, BTEX by EPA Method 8020, chlorinated hydrocarbons by EPA Method 8010, <br /> cadmium, chromium, lead and zinc, and for PCBs by EPA Method 8270 The stockpile was <br /> reported to contain total extractable petroleum hydrocarbons of 22 mg/kg, and PCBs of <br /> 0 095 mg/kg The soil samples from below the former tank were reported below detection <br /> Iii-nits for total extractable petroleum hydrocarbons and PCBs at detection limits of 0024 <br /> and 006 mg/kg, respectively Discoloration of the soils, however, was noted on the north <br /> wall of the tank cavity following removal of the tank <br /> 5 The soil samples from below the former 26,000-gallon diesel tank (ST-2A, B, C), from <br /> Stockpile 2, and from the remote fill pipe (RF) were analyzed for total extractable petroleum <br /> hydrocarbons by EPA Method 8015 and BTEX by EPA Method 8020 The soil samples <br /> from below the fonner tank were reported to contain total exuactable petroleum hydrocatbons <br /> ranging fiom 3,900 to 5,100 mg/kg and xylenes ranging from 0 016 to 0 072 mg/kg The <br /> soil fiom the stockpile was reported to contain total extractable petroleum hydrocarbons of <br /> • 640 ing/kg The soil sample fiom below the remote fill pipe was reported to contain total <br /> extractable petroleum hydrocarbons of 3,500 mg/kg and xylenes of 0 034 mg/kg <br /> 6 A soil sample was collected within the 26,000-gallon tank cavity from approximately 6 feet <br /> below fonner tank bottom (ST-21)) The soil sample was repoited to contain total extractable <br /> petroleum hydrocaibons below detection limits of 12 mg/kg <br /> 1 2 ADDITIONAL SOIL REMOVAL <br /> 1 The mitral soil samples collected from approximately 2 feet below the former 26,000-gallon <br /> diesel tank were of fill material containing elevated levels of petroleum hydrocarbons The <br /> subsequent soil sample, approximately 6 feet below the former tank revealed a fine-grained <br /> native material containing no detected petroleum hydrocarbons The remaining fill material <br /> containing elevated levels of petroleum hydrocarbons was removed from the bottom of the <br /> tank cavity An additional 6 to 8 feet of fill material was removed from below the former <br /> tank bottom Discolored soil is present at the eastern end of the tank cavity to approximately <br /> 4 to 5 feet below original ground surface <br /> . 2 Seven soil samples were then collected from the tank cavity Three soil samples were <br /> collected from the bottom of the tank cavity (ST-2E, F, H) and 2 soil samples were collected <br /> ENVIRONMENTAL SOLUTIONS <br />