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California Stop Page 2 <br /> 2224 Manthey Road March 30, 2011 <br /> Stockton, California 95206 <br /> 30 feet below surface grade (bsg), and two deep monitoring wells, screened between 70 and <br /> 80 feet bsg, as proposed by the EHD by letter dated 15 October 2008. Submit a work plan for <br /> the installation of the six wells to the EHD by 05 July 2011. <br /> The EHD directs that a human health risk assessment be performed. Residual contaminant <br /> concentrations should be compared to Environmental Screening Levels (ESLs) established by <br /> the San Francisco Bay Regional Water Quality Control Board, for gross contamination and <br /> direct exposure, and California Human Health Screening Levels (CHHSLs) published by the <br /> Office of Environmental Health Hazard Assessment, California Environmental Protection <br /> Agency. Residual contaminant concentrations that exceed any screening levels should then <br /> be evaluated in a Tier 2 risk assessment to determine if the site will qualify as a low-risk site. <br /> In addition, the potential risk from vapor intrusion should be evaluated. If additional data are <br /> needed to prepare a reliable vapor intrusion evaluation, submit a work plan to collect soil gas <br /> samples to the EHD by 05 July 2011. <br /> Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney(a-,)sjcehd.com if <br /> you have any questions concerning this letter. <br /> Sincerely, <br /> U(/ C'' I <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Ms. Ally L. Colavita, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />