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Souza II LLC <br /> Tank Pull Report <br /> Page 2 of 2 <br /> f. Tank 3 was uncovered and inerted by placing the appropriate amount of dry ice inside the tank. The <br /> lower explosive level (LEL) for gasoline and oxygen content was`then monitored. When LEL and <br /> oxygen levels were within safe Iimits, excavation of Tank 3 resumed and the tank was removed. No <br /> apparent soil discoloration was noted along the sidewalls or floor of excavation; however, a slight <br /> kerosene odor was noted in the vicinity. PID measurements of grab samples were collected from the <br /> excavation for monitoring concerns indicated volatile chemical concentrations of Iess than 1 part per <br /> million(ppm). <br /> Soil samples were collected from the eastern and western floors of the pit at approximately 2 feet and 3 feet <br /> below the former tank bottom,respectively(Figure 2). Per the request sof PHS/EHD,two discrete stockpile <br /> samples were collected in lieu of composite samples. Stockpile samples were collected at the median point <br /> on the north side of stockpile 3 and on the south side of stockpile 4. Stockpile volumes were approximately <br /> 15 yd3 each (a total of approximately 30 yd3). Soil sample analysis consisted of TPHd, TPHg, gasoline <br /> oxygenates,BTEX,and total lead as per PHS/EHD. <br /> The excavation was partially backfilled with approximately 10 yd3 of pea gravel. The balance was to be <br /> backfilled with clean native soil derived from ongoing construction activities at the site. The tank excavation <br /> soil stockpiles are to be relocated on site,placed on and covered with plastic sheeting- <br /> . ;t <br /> .k ti <br /> i <br /> EI <br /> I <br /> 4 ' <br /> i <br /> d <br /> 3 ' <br /> P <br /> !I, <br /> } <br /> `r <br /> f ' <br /> E 1 <br /> P <br /> I <br /> e <br /> '4 <br /> L <br /> IP <br />