The Department does not publish, nor use, generic soil clean-up levels for contaminated sites. Because each site is unique, cleanup levels must be calculated for each site through a risk assessment, which takes into account the types of toxic materials at each site, the potential receptors, the pathways that the toxic compounds might follow to get to the receptors and their fate in the environment. The process begins with a Preliminary Endangerment Assessment (PEA), which may be followed by a health risk assessment, depending on the findings of the PEA. You may request a copy of the PEA manual from your local DTSC Regional Office. The U.S. EPA often uses Preliminary Remediation Goals (PRGs) and Soil Screening Guidance as site screening tools. With the prior approval of the DTSC project manager, PRGs have been used on some specific sites in California. They are not routinely used as screening levels in California.