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03/10/2001 01:42 FAX • • 204 Proposed Workplan For Petroleum Hydrocarbon Contaminated Soil Stockpile Sampling 1. Interim Hydrocarbon Remedial Action Completed to Date WZI conducted the interim remedial action in the concrete tank area during January, 1995. Approximately 460 cubic yards of soil were removed from the area immediately adjacent to the concrete tank_ The soil was removed where possible until hydrocarbon non-detection levels were found as determined by an OVM and/or by visual inspection. Some hydrocarbon bearing soil was left in place under the concrete tank floor and sidewalls because it was not possible to remove the soil without endangering the building. Soil samples were collected and submitted to a California state certified analytical laboratory for analysis using U.S.Environmental Protection Agency Test Methods 418.1, 8015(M), 8020, 8010, and 8240. The excavated soil containing hydrocarbon concentrations was stockpiled on visqueen and covered to prevent unauthorized aeration. The stockpiled soil was sampled during August, 1995. Analytical results of the soil sampling indicated that only total petroleum hydrocarbons as gasoline and diesel fuel were present(WZI, 1995). TCE, PCE, TCA and other related compounds were not found to be present at detectable levels in the stockpiled soil. A Quarterly Status Report ("QSR')was submitted to PHSEHD during October, 1995 for site assessment/remediation operations conducted at the LNC site during the third quarter of 1995. Analytical results from the stockpiled soil sampling were presented in the QSR along with recommendations for soil remediation. We propose the following: 1. Soil Stockpile Sampling Program The approximate 460 cubic yards of petroleum hydrocarbon contaminated soil will be sampled by hand auger. The soil stockpile is comprised of approximately 5 to 12 feet of soil that has been piled on the remediation stockpile pad. The soil stockpile will be divided vertically into two halves each 3 to 4 feet thick and then into 50 cubic yard grids. Each of the grid patterns for the two levels will then evaluated for sampling locations. Random sampling of the cells will be obtained using protocol established by random sampling procedures outlined in USEPA SW-846. A 4-point composite sample for each 50 cubic yards of soil on the remediation stockpile will be collected. This will mean that a total of nine discrete soil samples will be collected_ Soil samples will be submitted for the analyses of total petroleum hydrocarbon as motor oil and diesel fuel following U.S.Environmental Protection Agency(USEPA)Test Method 8015 modified and 418.1 . Previous sampling has already indicated the lack of volatile organic compounds. The samples will be logged in using a standard chain of custody and put on ice and submitted to Kiff Analytical for analysis, Davis, California. R\wpfile\LCNI-CN 100.-pd 3