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Jerry Uie Page 4 March 3,2005 CONCLUSIONS The work plan proposes soil vapor sampling conducted consistent with DTSC guidance (DTSC &LARWQCB,2003; DISC, 2004); therefore the baseline data should be acceptable for use in a predictive indoor air human health risk assessment, HERD recommends the above modifications to the worts plan to obtain adequate soil vapor and geotechnical data for a baseline human health risk assessment of indoor air for the current apartment dwellers within the zone of influence of the SVE system prior to start up of the SVE system. To expedite risk evaluations in the apartments'area,the responsible parties should address the L& M OU as two areas of concern(AOCs), preparing a separate HRA using a hot spot approach for each AOC. One AOC being the Delta View Apartments(the apartments'area)and the second AOC being the undeveloped area. HERD recommends filling the remainder of the HHRA data gaps in the apartments' area, consistent with HERD's February 2, 2005 memorandum, as soon as feasible and irrespective of the operational status of SVE system. RERD continues to recommend:(1)collecting supplemental data to address all data gaps; (2)submittal of the complete data sets as well as the data sets proposed for use in the HHRA in electronic format to ensure site characterization is adequate for HHRA purposes;and (3)preparation of the revised HHRH consistent with comments provided in HERD's September 9, 2004 and September 28, 2004 memoranda using the DTSCIHERD approved HHRA data set. REFERENCES DTSC, 2003, Advisory—Active Soil Gas Investigations. January28, 2003. DTSC, 2004. Guidance for the Evaluation and Mitigation of Subsurface Vapor intrusion to Indoor Air. December 15,2004, Reviewed by: David L. Berry, Ph.D. Senior Toxicologist Science, Pollution Preventlon and Technology Program Human and Ecological Risk Division 050303JL.ttoc