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rr h" KLEINFELDER 3.3 SOIL SCREENING AND CONFIRMTION SOIL SAMPLING After the soil was aerated a minimum of two weeks, a field survey was conducted on the aerating soil with a portable organic vapor detector. A flame ionization detector (FID) was used to measure total ionization campounds in parts per million by volume (ppmv) relative to a select standard. A 90 part per million methane calibration gas was used as the standard for relative comparison of the field readings. The FID provides a qualitative indication of contamination. If high FID readings were recorded, aeration was continued, and the soil pile re—sampled at a later date. once relatively low or no FID readings were recorded from the aerating soil, a confirmation soil sample was collected from the point with the highest FID readings. If no FID readings were recorded, a random confirmation sample was collected. Plates 2 through 5 (see Appendix C) show the FID survey and confirmation sample locations for each aeration pile. Each confirmation soil sample was submitted under sham-of-custody to Chemwest Analytical Laboratories and analyzed for TPH by EXM/GC-FID. Laboratory data sheets and chain-of-custody forms for each of the four confirmation soil samples are included in Appendix D. Table 1 presents the analytical results for each aeration pile. i 3.4 SOIL DISPOSAL t RWQCB required that soil must have a TPH concentration below 300mg/kg for landfill disposal. Soil with a TPH between 100 and 300 mg/kg should be disposed. to the landfill as u±Rxmediate cover. Soil with a TPH c concentration below 100 mg/kg can be used as daily cover or disposed directly into the landfill. Based on the analytical results of the A confirmation soil samples, three of the four piles (130 to 300 ppm) can be A used as intermediate cover and the remaining pile (97 ppm) can be disposed directly to the landfill. 104-88-681 4