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i <br /> car i <br /> i <br /> 7-Eleven Store No. 19976 Page 2 <br /> 1399 North Main Street November 8, 2010 <br /> Manteca, California 95336 <br /> i <br /> report; therefore, the EHD is directing you to submit this evaluation within thirty days of date of <br /> this letter. Residual contaminant concentrations should be compared to Environmental <br /> Screening Levels (ESLs) established by the San Francisco Bay Regional Water Quality <br /> Control Board, for gross contaminants and direct exposure, and California Human Health <br /> Screening Levels (CHHSLs). published by the Office of Environmental Health Hazard <br /> Assessment, California Environmental Protection Agency, and include an evaluation of the <br /> soil gas data from soil gas samples collected at three feet below surface grade in September <br /> 2000. If any aspect of this evaluation indicates a potential hazard or risk to human health or <br /> the environment, then submit a work plan to collect additional soil gas samples to the EHD by j <br /> 27 December 2010. Please note that technical guidance documents for soil gas sampling <br /> usually prescribe a sampling depth of five feet to minimize the potential for atmospheric <br /> breakthrough diluting the sample. <br /> By letter dated 22 September 2009, the EHD,informed you that this office is not being notified <br /> of scheduled groundwater sampling events; as of this time, this office is not receiving <br /> notification of pending sampling events. You must inform.the EHD at least seventy-two hours <br /> prior to each groundwater monitoring and sampling event so EHD staff can be present for an <br /> inspection. <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 /> i <br /> Sincerely, <br /> i <br /> e <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG j <br /> Senior Registered Environmental Healt Specialist Engineering Geologist <br /> c: Mr. Ed Simonis, PG, Stantec Consulting Corporation, 3017 Kilgore Road, Suite 100, Rancho <br /> Cordova, California 95670 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br /> I <br /> i <br /> i <br /> { <br />