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- I <br /> Page 2 of 2 <br /> • The Human Health Risk Assessment(HHRA) program, RISC Workbench 5, used by AGE did not calculate <br /> a cancer risk since xylenes and TPH-g are not listed as carcinogens but the total hazard quotient(HQ)was <br /> calculated to.be 0.00049 for xylenes and 0.023 for TPH-g; <br /> • Benzene concentrations detected in groundwater over the past five years are all below the groundwater <br /> ESI-s for evaluation of potential,vapor intrusion concerns for commercial land use; <br /> • Although soil gas samples have not been collected, this-site is an auto repair shop with petroleum <br /> hydrocarbon odors coming from the repair shop; and <br /> • The State Board recommends this site for closure. <br /> Jim if you had reviewed this site.for yesterday's meeting and concur that.this site can be moved to closure, <br /> would like to prepare the Case Closure Summary to submit to you. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Phone: (209)468-9852 <br /> Email: vmccartneyO-sicehd.com <br /> i <br /> i <br /> I <br /> 2/19/2013 <br />