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Site Characterization and S 'entediation Plan- 7500 fest Eleventh Street, Trac 1. Page 18 r- Cleanup Criteria To establish quantified objectives for the soil treatrkient, a set of cleanup criteria have been developed based on the considerations discussed below. The United States Environmental Protection Agency's (U.S. EPA) Region IX (San Francisco) and the State of California have published guidelines for setting cleanup criteria at sites affected by components of fuel hydrocarbons. U.S. EPA Region IX published "Preliminary Remediation Goals" (PRGs) to make a preliminary determination of whether action should be taken to remediate affected soil in residential and industrial areas. According to these U.S. EPA guidelines, soil containing lower concentrations of analytes of concern than the PRGs need not be remediated. However, when soil is found to be affected by concentrations of an analyte of concern at concentrations greater j than the PRG, it does not necessarily have to be remediated. The criteria only establish the concentration above which it is necessary to make additional site- specific evaluations to determine whether remediation is necessary. The State of California does not set predetermined cleanup criteria for analytes of concern in soil. Cleanup criteria are set on a site-specific basis by the regulatory agency having jurisdiction over the site being remediated. However, a number of documents have been published to provide general guidance for selecting the cleanup criteria at a specific site. Selection of cleanup criteria is influenced by ]) the proximity of the affected soil to materials or locations that must be protected from adverse impact; 2) the type of soil and the hydrostratigraphy that separates the affected soil from groundwater and, 3) the ! potential beneficial uses of the groundwater, particularly pertaining to the ' groundwater's use or non-use as a source of drinking water. ! Buonicore (1996) provides tables of both Federal and State criteria for maximum permissible and recommended concentrations of analytes in soil and groundwater. These include general guidelines for cleanup criteria at California sites with hydrostratigraphy generally similar to the subject site for soil at varying distances above drinking water and above non-drinking water. The guidelines for sites where affected soil is located less than 40 ft above the i groundwater table, as is the case at 7500 West Eleventh Street, are included in Table.5., j sic