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knK L E I N F E L D E R D August iI, 1987 AUG 1Z;1 1987 File: 24--1067-1 ENVIROMENTAL HEALTH FERMIT/SERVICES Doug Wilson San Joaquin Local Health District P.O. Box 2009 Stockton, CA 95201 Attention: Doug Wilson SUBJECT: TPH Levels for Soil. Disposition at the Lodi AT&T Site Dear Mr. Wilson: As per our telephone conversation on 24 July 1987 the following letter concerns the disposition of approximately 400 cubic yards of diesel— tainted soil at the AT&T transfer station on West Turner Road, Lodi, California. The following procedures will be implemented to enhance the degradation of the volatile and semi—volatile constituents in the diesel. Initially the soil will be spread into a 12—inch lift and tilled daily onsite. During the aeration of the soil, periodic screening of the soil with a flame ionization detector (FID) will be performed to evaluate the degradation of the diesel. Once the soil has been significantly degraded, ten final characterization samples will be collected from a grid pattern on the soil. The samples will be contained in brass tubes and submitted to an analytical laboratory to be composited into one sample. This composite sample will then be analyzed for total petroleum hydrocarbons (TPH) by GC—FID. In addition to providing a TPH value as diesel, the analytical laboratory is able to accurately estimate the percentages of volatile, semi—volatile, and non—volatile constituents in the sample. Once the final characterization results are received, the disposition of the soil will be assessed. One option would be to leave the soil on the AT&T site. The second option would be to dispose the soil at Forward Landfill in Stockton, California. Kleinfelder is suggesting that for the soil to be left onsite, the verification sample should be less than 100 mg/kg TPH. If this result is not achievable, the soil will be disposed at the Forward Landfill. It is Kleinfelder's postulate that the percentage of volatile constituents in the diesel—tainted soil would be very low to non—detectable. This is supported by the EPA 8020 and 8015 analytical results from the original soil characterization. All constituents analyzed by EPA 8020 were below detection limits in all four samples, even though TPH concentrations KLEINFELDER 9795 Business Park Drive, Suite C, Sacramento, CA 95827 (916) 366-1701