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i <br /> 76 Service Station No. 1.1193 Page 2 <br /> 3202 West Hammer Lane - February 16, 2011 <br /> Stockton, California <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. In addition, the potential risk for vapor intrusion should be evaluated. If additional <br /> data are needed to prepare a reliable vapor intrusion evaluation,-submit;a work plan to collect <br /> soil gas samples to the EHD by 25 May 2011. Residual contaminant.concentrations that <br /> exceed any screening levels should then be -evaluated in a Tier 2 risk assessment to <br /> determine if the site will qualify as a low-risk site. <br /> _ 4 <br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) 468- <br /> 9852, or by email at vmccartney@sjcehd.com.'- <br /> Sincerely, <br /> 6 a <br /> Victoria L. McCartney; REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Hea h Specialist Engineering Geologist <br /> c: Mr. Brad Shelton, PG, Stantec Consulting Corporation, 3017 Kilgore Road, Suite 100, <br /> Rancho Cordova, California 95670 <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 j <br /> i� <br /> as <br /> f <br />