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n <br /> The former tank excavation area had been backfilled and graded to level <br /> Investigations conducted later revealed contaminated soil that had to be excavated <br /> This former tank area is now excavated to remove petroleum contaminated soil and the <br /> soils are stockpiled onsite.The depth of this excavation is 4 feet and covers an area of <br /> 350 square feet. <br /> Task 3.2.3. Remediation of Soils from Northwest Corner <br /> j <br /> Previous investigations conducted at the northwest corner of the site indicate soil <br /> contamination extends between a depth of 5 to 25 feet over an area of approximately <br /> 450 square feet Based upon this, the total volume of the soil to be remediated is <br /> approximately 420 cubic yards Data suggest that there is no off-site migration of soil <br /> contamination. Soil samples will be taken from soil boring TB5 and analyzed for TPH <br /> as gasoline, BTEX and organic lead Soil remediation techniques such as in-situ soil <br /> venting, in-situ vapor extraction, bioremediation, or onsite incineration are considered <br /> However because of low volumes of soils here, these m-site techniques do not appear <br /> to be cost effective Onsite incineration is eliminated because it is very expensive. <br /> Hence, offsite disposal of this soil to an appropriate facility, such as Forward Landfill <br /> in Stockton is the most cost effective method of remediation The excavation will be <br /> backfilled with engineering fill, and paved to grade with asphalt <br /> Table 3-2 shows the cost for Tasks 3 2.1 , 3.2 2, and 3.2.3 as described above <br /> 9 <br /> s <br />