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tank rinsate During removal, holes were observed in the bottom and side <br /> of the tank <br /> 22 SOIL EXCAVATION AND GROUND WATER EXTRACTION <br />' Soil and ground water removal activities conducted at the former tank <br /> location are presented in the Tank Removal Report During the removal <br />' of the tank, hydrocarbon staining was observed and a strong hydrocarbon <br /> odor emanated from the sidewalls of the excavation The ground water in <br /> the excavation was also 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 /> 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 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 from the tank excavation On 9 March <br /> 1998, ERM performed additional soil and ground water removal activities <br /> at the former tank location <br />' <br /> Following another round of sampling, the PHS EHD requested that one <br />' more round of soil removal be conducted to remove petroleum <br /> hydrocarbon-impacted soil on the northern and eastern walls of the tank <br /> excavation ERM performed additional soil and ground water removal <br />' activities at the former UST location on 1 May 1998 <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, oxygen-releasing compound (ORC) was placed <br /> in the tank excavation to stimulate bioremediation of residual petroleum <br /> hydrocarbons in the ground water The excavation site was then paved to <br />' match former pavement conditions <br /> All soil removed from the tank excavation was disposed of off site at <br /> Forward, Inc , landfill in Stockton, California,a Class II non-hazardous <br />' ERM 6 HEINZ USA 33746x3/27/00 <br />