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Jay's Mini Mart Page 2 <br /> 3302 West Lane April 9, 2008 <br /> Stockton, California 95204 <br /> Please note that the Central Valley Regional Water Quality Control Board (CVRWQCB) <br /> is requiring evaluation of Environmental Screening Levels (ESLs), (San Francisco Bay <br /> Regional Water Quality Control Board), California Human Health Screening Levels <br /> (CHHSLs), and the potential for vapor intrusion into buildings for closure consideration <br /> of sites having residual contamination proposed to be IeA in place. Therefore, you are <br /> directed to evaluate the potential threat for vapor intrusion inside the buildings located <br /> onsite, the ESLs, and CHHSLs. Please submit a vapor intrusion evaluation based on <br /> existing site data and the ESLs and CHHSLs evaluations, or a work plan to the EHD to <br /> assess the potential for vapor intrusion into the existing onsite buildings by June 13, <br /> 2008. <br /> Total extractable petroleum hydrocarbons quantified as diesel (TPHd), di-isopropyl ether <br /> (DIPE), ethyl tertiary-butyl ether (ETRE), tertiary-amyl methyl ether (TAME), tertiary <br /> butylalcohol (TBA), and 1,2-dibromoethane (EDB) have not been detected in any <br /> i groundwater samples collected from the three onsite monitoring wells. Therefore, the <br /> EHD approves removing these compounds from the analyte list and instead analyze <br /> groundwater samples collected semi-annually for benzene, toluene, ethyl benzene, total <br /> xylenes (BTEX), total petroleum hydrocarbons quantified as gasoline (TPHg), methyl <br /> tertiary-butyl ether(MTBE), and 1,2-DCA. <br /> If you have any questions, please contact Vicki McCartney, Senior. Registered <br /> Environmental Health Specialist, at (209) 468-3456 or by electronic mail at <br /> vmccartney@s3cehd.com. <br /> sjcehd.com. <br /> Sincerely, <br /> G <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c:' Ms. Jeanne Homsey, PE, ATC Associates Inc., 1117 Lone Palm Avenue, Suite 201, <br /> Modesto, California 95351 <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 <br /> 95670 <br />