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deteriorated and was cut open to expose and facilitate removal of the <br /> cement slurry inside The tank was loaded onto a truck and hauled to <br />' Erickson's certified disposal facility <br />' 3.2 SOIL EXCAVATIONAND GROUND WATER EXTRACTION <br /> As summarized in the Tank Removal Report, during the removal of the <br />' UST, the sidewalls of the excavation contained hydrocarbon staining and <br /> a slight hydrocarbon odor The ground water in the excavation was also <br /> observed to have an oily sheen <br /> Based on visual observations, the tank pit was overexcavated to remove <br /> the most heavily impacted soils The bottom of the tank pit was also <br /> excavated to remove impacted soils and facilitate collection of a ground <br /> water sample Ground water was extracted from the excavation during <br /> 1 the soil removal activities and pumped to a temporary storage tank for <br /> subsequent treatment and disposal Soil samples were collected from the <br />' sidewalls of the excavation and a ground water grab sample was also <br /> collected <br /> After reviewing the analytical data generated from the tank excavation <br /> samples, the PHS/EHD requested that additional soil and ground water <br /> removal be conducted to remove additional petroleum hydrocarbon- <br /> impacted soil and ground water in the tank excavation On 9 March 1998, <br /> ERM performed additional soil and ground water removal activities at the <br /> former tank location <br /> Following receipt of the post-excavation sample results and upon <br />' approval from PHS/EHD, the tank excavation was backfilled with <br /> imported clean fill material as necessary to restore the site to existing <br /> grade During backfilling, ORC was placed in the tank excavation to <br /> stimulate bioremediation of residual TPH-g and BTEX in ground water <br /> The excavation site was then paved to match former pavement conditions <br /> tAll soil removed from the tank excavation was disposed of off site at <br /> Forward, Inc , landfill in Stockton, California, a Class 11 non-hazardous <br />' waste landfill Approximately 153 tons of soil was removed from the tank <br /> excavation All ground water removed from the excavation was pumped <br /> to a temporary storage tank for subsequent treatment and disposal to the <br />' sanitary sewer The ground water was treated to non-detectable <br /> concentrations of TPH-g and BTEX using granular activated carbon prior <br /> to disposal In total, approximately 8,000 gallons of ground water was <br /> ERM 12 HEWZ OSA-3374 60-3/27/00 \ <br /> 1 <br />