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Fremont Shell Station Page 2 of 2 <br /> 2494 E. Fremont Street May 6, 2013 <br /> Stockton, California 95205 <br /> • Provides calculations showing current estimates of the residual adsorbed contaminant <br /> masses of TPHg and benzene, and dissolved masses of TPHg, benzene and 1,2-DCA; <br /> • Addresses the human health risk from direct contact and outdoor air exposure <br /> considering soil concentrations of benzene and ethylbenzene detected at five feet below <br /> surface grade (bsg) exceeded the concentrations for a commercial/industrial site found <br /> in Table 1 of the Low-threat Underground Storage Tank Case Closure Policy for which <br /> no site specific risk assessment has been performed for this site. <br /> The EHD directs that all monitoring and sampling at this site be suspended while the site is <br /> considered for closure with the exception of monitoring well S-1; resample that well an <br /> additional time to confirm reduced contaminant concentrations since the 04 June 2012 <br /> monitoring event. If you have any questions, please contact Vicki McCartney at (209) 468-9852 <br /> or by email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Healt Specialist Engineering Geologist <br /> c: Mr. Larry Silva, PG, Conestoga-Rovers & Associates, 19449 Riverside Drive, Suite 230, <br /> Sonoma, California 95476 <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 />