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a" t <br /> rs <br /> 3 <br /> Fa_77 ta <br /> C� <br /> KLEINFELDER <br /> 3 SOIL REMEDIATION <br /> Appro)dmately 450 cubic yards of soil were excavated at the site. Approximately 100 cubic <br /> yards was assessed to have a total petroleum hydrocarbon concentration below 100 mg/kg, <br /> and was transported to Forward Landfill in Stockton for disposal. The remaining 350 cubic <br /> Yards of contaminated soil was aerated onsite and at Forward Landfill. <br /> 3.1 SOIL AERATION <br /> j :.a The SO cubic yards of contaminated soil excavated from the original tank excavation had an <br /> assessed TPH concentration between 1,000 and 2,000 mg/kg. This concentration allowed <br /> r. aeration:`at a rate of 30 cubic yards oer day. The remaining 300 cubic yards of <br /> I contaminated soil removed during the additional soil excavation had an assessed TPH <br /> concentration between 100 and 500 mg/kg allowing aeration at a rate of 120 cubic yards <br /> i per day(San Joaquin County Air Poli1ation Control I1-'. <br /> � .strict Aeration Guidelines,Appendix <br /> !IF A). <br /> Soil aeration was conducted on and offsite according to APCD Guidelines from May 16, to /f <br /> July 15, 1988. Four 25 cubic yard sections were aerated onsite <br /> S and two sections, one 120 <br /> I cubic yards and a second of approximately 130 cubic yards were aerated at Forward <br /> Landfill. <br /> r <br /> Soil to be aerated Was removed from the covered stockpile and spread out in a continuous <br /> 6 to 12 inch thick layer behind the store or at the landfl <br /> ll. The soil was turned one to two <br /> times each day for a minimum of four days Once the TPH concentrations appeared to be j <br /> +. below 100 mg/kg, an organic vapor survey was performed on the soil and a confirmation <br /> sample was collected and analyzed. <br /> 3.2 SAIL SCREENING AND CONFIRMATION SAMPLING <br /> After the soil was aerated a minimum of four days;afield survey was conducted on the soil <br /> section using a portable organic vapor detector. A photoionization detector (PID) was <br /> used to measure total ionization compounds in parts per million by volume(ppmv) relative <br /> to a select standard.. A 100 part per million isobutylene. calibration gas was used as the <br /> 122-88-1163 3 <br /> ii <br />