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M <br />Souza 11 LLC <br />Tank Pull Report <br />Page 2 of 2 <br />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 limits, 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 less 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 of 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, BTT -X, 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 />