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i <br /> ENVIRONMENTAL HEALTH .: EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Program Coordinators <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman, R.E.H.S. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S.;R.D.I. <br /> Assistant Director Margaret Lagorio, R.E.H.S. <br /> QuFoR Telephone: (209)468-3420 <br /> Robert McClellon, R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> SHELL OIL PRODUCTS US SEP 1 <br /> DENIS L BROWN <br /> 20945 S WILMINGTON AVENUE <br /> CARSON CA— 90810 <br /> RE: Ripon Shell Service Station SITE CODE: 506186 <br /> 341 East Main Street RO: 445 <br /> Ripon,California ` <br /> 'San Joaquin County Environmental Health Department (EHD) has reviewed Fate and Transport <br /> Modeling Report, dated July 25, 2006, prepared and`submitted by Cambria Environmental <br /> Technology, Inc. (Cambria) for the above-referenced site. EHD concurs with Cambria's <br /> assessment that based on the fate and transport model VLEACH (Version 2.2.0.2), the mass of <br /> residual sorbed methyl tertiary butyl ether(MTBE)is negligible and should not pose a significant <br /> threat to groundwater in the future. <br /> i <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) is requiring evaluation of <br /> Environmental Screening Levels (ESLs), California Human Health Screening Levels (CHHSLs), <br /> (San Francisco Bay Regional Water Quality Control Board) and the potential for vapor intrusion <br /> into buildings for closure consideration of sites having residential contamination left in place. <br /> Therefore, you are directed to evaluate the threat of vapor intrusion inside the buildings located <br /> onsite. Please submit a work plan to EHD by November. 15, 2006, that will assess the potential <br /> for vapor intrusion into the existing onsite buildings, or provide a rational, with technical support,, <br /> for discounting vapor intrusion into the.buildings as a potential hazard for this site. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-3456 or by electronic <br /> mail at vmccartney@sjcehd.com. <br /> Donna Heran, RENS,Director <br /> Environmental Health Department / <br /> Victoria L. McCartney, Senior REHS Nuel C.Henderson,Jr.,PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV, j <br /> c: Joe W.Neely,PG—Cambria <br /> James L.L.Barton,PG—CVRWQCB <br /> Matt Machado—City of Ripon <br /> Jeanne Zolezzi—Herum, Crabtree,Brown <br /> i <br /> i <br />