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r' P' 4.6 Environmental Screening Levels 4.6.1 Summar Staff of the San Francisco Bay Regional Water Quality Control Board.(Water Board) has prepared a February 2005 update to the technical document Screening For Environmental Concerns at Sites With Contaminated Soil and Groundwater(RWQCB,2005). This update reflects recent'revisions to toxicity factors presented in the i1SEPA Preliminary Remediation Goals document("PRGs",October 2004 and updated June, 2008)as well as references to recent publications regardingthe evaluation of soil gas vapor intrusion concerns. The updated ESL document also incorporates.California Human Health Screening Levels(CHHSLs) for soil and soil gas published in December 2004 and by the Office of EnvironmentalHealth Hazard Assessment. These screening levels address direct exposure to.soil and potential vapor intrusion into buildings. Screening levels very similar to the CHHSLs were included in the July 2003 edition of the ESL document(RWQCB,2003). The February2005 edition of the ESL document includes revisions to make correlative screening levels in that document more consistent with approaches used to develop the CHHSLs. As discussed in the ESL guidance document,the CRHSLs do not address all potential environmental concerns that may'be present at sites where contaminated soil and groundwater are identified. Evaluation of additional concerns.must be carried out separately. The updated ESL document offers one approach to accomplish this. updates is provided in Chapter 1 and Appendix 8 of the RW CB 2005 Amore detailed summaryofupda p p pp Q ( ) ESL document. The document is intended.. to help expedite the identification of potential environmental concerns at sites where contaminated soil and groundwater have been identified and ultimately expedite the cleanup and redevelopment of these properties. Environmental\STETA RSCR09102008.wpd 27 4