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-� A 164, KCE' INFELDER it tI �I The contaminated soil will be . stockpiled and covered to :.prevent uncontrolled aeration until t.he :final aeration program is initiated. The ! details of the aeration process are discussed in Section 3.2. 3.2 LANDFILL AERATION TECHNIQUE i The analytical results of the excavated soil range from 220 to 1.,100 mg/kg :! TPH as diesel. The average TPH concentration of 550 ,mg/kg falls into the 500 to 1,000 mg/kg category according to San Joaquin County APCD guidelines (Appendix B). Based oti the average organic content, the APCD guidelines allow at least 60 cubic yards of uncontrolled aeration per day. The 400 cubic yards of contaminated soil will°be aerated iii 6 to 7 separate sections. Ij Kleinfelder may opt to collect and submit additional soil. samples from the stockpile for laboratory analysis; to evaluate possible changes in the petroleum hydrocarbon concentration that may haves occurred since our original investigation in May of 1987. Appreciablei'changes in petroleum hydrocarbon concentration may affect the rate of soil aeration. Aeration will be conducted by uncovering and spreading a section soil into a layer approximately 6 to 12 inches thick. .The soil Grill be tilled at least once a day for approximately five days until the petroleum hydrocarbon concentration is below 300 mg/kg. if this concentration is not achieved during the first five days of aeration, the soil will Ei continue to be tilled until the desired concentration is achieved. j 3.3 QUALITATIVE FIELD SCREENING AND' CONFIRMATION SAMPLING' iEach section of aerated soil will be screened in the field and have a confirmation sample submitted for TPH analysis. After approximately five days of aeration, qualitative field screening and confirmation sampling will be performed on the soil. The field screening will be performed by dividing the spread soil into ten equal areas in a grid pattern. A soil �I 59-87-679 4 E�