SITE INFORMATION AND CORRESPONDENCE

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February 23, 1993 Mr. Tom Juano Plant Man4ger `r Herrick Corporation P.O. Box 8429 3003 E. Hammer Lane Stockton, CA Dear Mr. Juano: As we have discussed, the stockpiled soil remaining at your facility contains diesel compounds at concentrations which exceed acceptable levels for use as clean fill material. We recommend that this soil be treated on-site to reduce the concentrations of diesel present or transported directly to a landfill capable of +� accepting the soil in its present condition. This proposal presents our work plan, timetable, and unit price for each of these alternatives. WORK PLAN v As shown on the attached analytical certificates, the stockpiled soil contains diesel at concentrations ranging up to 260 mg/kg (ppm) . The most economical approach for handling this soil is on- site treatment using bioremediation. A competitive but slightly more expensive option is transportation to the BFI Vasco Road w. Landfill in Livermore. DECON' s work plan for each of these approaches is as follows: On-Site Bioremediation DECON will treat the soil by blending it with a non-hazardous solid material that contains all the microbes and nutrients necessary to treat contaminated soil. After mixing, the soil will be placed in a treatment cell and covered by 6-mil polyethylene sheeting. The soil will be stockpiled three feet high during treatment. A representative sample of the soil will be collected after 3 w► months, and bimonthly thereafter, to. monitor the progress of the treatment process. A complete set of confirmation samples will be collected and analyzed when the representative sample indicates that diesel compounds are no longer present in- the soil at detectable �+ concentrations. We anticipate that 8 to 12 confirmation samples will be required. 23490 Connecticut Street,Hayward,CA 94545 (510}732-6444 Fax(510)782-8584 CL#f545726