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Brown`and Caldwell '%' Consultants 723 S Street Sacramento California 95814-7092 OCT 0 9 199 444-0123 FAX(916)444-9437 E \YIRONMOTAL HEALTH PERMIT/SERVICES October 6, 1992 Mr. Salvatore Trinchera California Cedar Products Company Post Office Box 8440 Stockton, California 95208 017-7046-01 Subject: Work Plan for the Overexcavation of Diesel Affected Soil at California Cedar's Lockeford Facility Dear Mr. Trinchera: This work plan describes the planned overexcavation of the small area of diesel affected soil remaining in the tank excavation from the August 26, 1992 tank removal at California Cedars' Lockeford Facility. Attachment 1 presents the report of sample results from the tank removal. The area to be overexcavated is in the area where sample T-2-1 @ 14 was collected. Overexcavation is recommended because it is the most efficient and cost effective means of remediation. In addition, it would be desirable to close the site prior to the start of the rainy season and remediation by overexcavation can be completed quickly. Work will begin within one week of County approval of this overexcavation plan. Brown and Caldwell Consultants (BCC) is not anticipating that a large volume of soil will need to be removed for two reasons; (1) Other samples in the excavation were well below regulatory action levels or nondetectable at 15 feet below grade and(2)The excavator planned to perform the excavation has limits, both in depth and laterally. It is anticipated that only 20-30 cubic yards of additional material will be generated. In the event the diesel affected soil extends beyond the capacity of the planned excavator, a second more extensive work plan will be submitted for County approval. Following removal of the diesel affected soil, BCC personnel will collect 3 soil samples from the walls of the overexcavation. These samples will be analyzed for total petroleum hydrocarbons using EPA Method 8015 modified (diesel). Upon receipt of laboratory results a report will be submitted to California Cedar Products Company and the County Environmental Health Department for documentation and to acquire approval for closure. Disposal of the stockpiled material generated during this phase of work and the material already on-site from the tank removal activity will be assessed once the total amount of material is known. A plan outlining the recommended disposal options will be submitted to the County for approval prior to disposal. z