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_ ENV/RONMENTAL TECHNOLOG/ES Section C of the CSDF. Historical Chemical Use. will be used to determine whether or not the contaminated soil is from a source of known previous use. For contaminated soil with properly documented previous use, Forward will identify and list the chemicals and chemical hazards associated with the industry or type of previous use. Appropriate corresponding methods of analysis that will be required to identify such chemicals will be listed as shown in the attached example for contaminated soil from a gas station (Table 1). If the source and historical chemical use associated with the contaminated soil are unknown, then contaminated soil must be screened for various types of pollutants, as listed on Table 2. Section D of the CSDF. Previous Soil Investigation. will be used by Forward to determine the availability of appropriate chemical description of the contaminated soil in previous soil investigations or remedial investigations. If previous investigation data for chemical contaminants are available, the reports containing such information will have to be submitted to Forward. In the absence of any such previous information, Forward will request the generator to conduct the chemical analyses listed in Table 2 to identify the types and concentrations of chemicals in the contaminated soil, unless the contaminated soil is considered inert (e.g., construction debris, shrubbery and less than 20 cu. yd.) Section E. Chemical Analysis Conducted on Soil, will be compared with the required methods of analysis to the equivalent list for Table 1, that were derived from the historical chemical use at the source of the contaminated soil. If the types of analysis already conducted on the contaminated soil do not encompass the equivalent list for Table 1, those analyses not covered will be requested from the generator in order to complete the evaluation of the contaminated soil. Section F. Soil Sampling Data. will be used to determine whether a representative number of samples of the contaminated soil were collected appropriately for chemical analysis. The number of samples, inclusion of targeted hot spots, and whether samples were collected in situ or from a stockpile will be evaluated for sufficiency, quality, and representativeness of samples. Sampling design, including targeted locations (such as "hot spots") and discrete methods (such as random, stratified and systematic) will be used to determine whether the sampling protocol is acceptable. Section G. Chemical Result Summary, will be used to determine the chemical contaminants in ' the soil, and whether their concentrations are within the acceptance criteria specified in the WDR and in this self-implementing program. The highest concentration ranger for detectable chemicals in the contaminated soil will be used to estimate the most probable concentrations of the chemicals in the contaminated soil. The average concentration will be compared to contaminant-specific designation levels and those specified in the WDR to determine soil type. Volume and percentage of soil containing the detectable chemicals will be used to identify which portions of the soil can be accepted, assuming that the contaminated soil can be segregated according to chemical types and/or concentrations. 12 7255 Soroni Drive-Oaklond,Californla,USA 94611 TEL(415)339-1543-FAX(415)339-6775