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Kennedy/Jenks/Chilton Mr. Charles Whitworth Cal-Farm Supply 14 July 1989 Page 7 o Five, five-gallon containers of Ordram 8-E with the original labels from the Stauffer Chemical Company on it. a Eight or nine five-gallon containers of TSI Silvisar 550. It is assumed that the Ordram and Silvisar still contain product because the containers appear to be intact, and there was no evidence of leakage or z staining on the floor area around these containers. However, staining was evident around the Alfa-Tax containers indicating that the product might have leaked out. RESULTS OF LABORATORY ANALYSES Results of laboratory analyses are summarized in Tables 3, 4, 5, 6, and 7. Tables 3 and 4 contain the results of the TPH, BXTE, and nitrate analyses performed on the soil and groundwater samples. Nitrate concentrations detected in surface soil samples are presented in Table 5 and results of the pesticide analyses performed on the surface soils and wipe samples are provided in Tables 6 and 7. Laboratory data sheets including quality assurance/quality control data sheets are presented in Attachment E for soils analyses and Attachment F for groundwater analyses Relevant Criteria Potentially relevant criteria are listed in the tables for constituents for which criteria are available. These criteria include drinking water standards such as the EPA Maximum Contaminant Level (MCL) for nitrate and DHS action levels for BXTE. Action levels for chemicals in soil are determined on a site specific basis. Action levels are typically derived by multiplying the drinking water standard by a factor of up to 1,000 to calculate allowable concentrations of chemicals in soil . This approach has been used by both the EPA and the DHS. However, a conservative attenuation factor of 100 (a 10-fold unsaturated zone attenuation factor and a 10-fold factor to account for dilution at the interface with the saturated zone) was utilized for the Cal - Farm soils to calculate soil criteria Petroleum hydrocarbons (TPH) do not have established criteria for soils or groundwater. Action levels for these chemicals were estimated using a leaching potential analysis as recommended by the California Leaking Underground Fuel Tank (LOFT) Field Manual The leaching potential analysis is provided in Attachment G. For pesticides in soil the Total Threshold Level Concentration (TTLC) is referenced as an action level even though the TTLC was developed to define hazardous wastes The TTLC has been established by the State of California for the compounds DDT and methoxychlor in soils. To obtain estimates for soil criteria for the pesticides which do not have established TTLCs or drinking water standards, the ratio of the oral rate LDS, to the TTLC for DDT was