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lsw <br /> San Joaquin County DIRECTOR <br /> Environmental Health Department Donna Neran,RENS <br /> ASSISTANT DIRECTOR <br /> y� 600 East Main Street Laurie CotuHa, RENS <br /> Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> .. • <br /> ,.�•• Margaret Lagorio,RENS <br /> Website: www.sjgov.org/ehd Robert McClellon, RENS <br /> �Ti. <br /> 6 Phone: (209) 468-3420 Jeff CeffCarruesco, REHS,RDI <br /> Foley, RENS <br /> Fax: (209)464-0138 Kasey <br /> September 1, 2009 <br /> Denis Brown <br /> Shell Oil Products <br /> 20945 South Wilmington <br /> Carson, CA 90810-1039 <br /> Subject: Shell Service Station Site Code: 1473 <br /> 2375 Grant Line Road <br /> Tracy, CA 95376 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Closure <br /> Summary Report (Report) dated August 3, 2009, submitted on your behalf by Conestoga <br /> Rovers & Associates (CRA) and has the following comments. <br /> The Report summarizes the investigation and remediation of the above subject contaminated <br /> underground storage tank site, provides calculations of contaminant mass remaining onsite <br /> and a discussion of how long it will be until background levels are reached, an evaluation of <br /> the potential threat of vapor intrusion from the remaining contamination, and all items <br /> required in Appendix A of the Tri-Regional Board Staff guidelines. A sensitive receptor <br /> survey had been previously completed and submitted. <br /> On August 19, 2009 the EHD discussed the Report with the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB). The CVRWQCB does not agree that this site is ready <br /> for closure due to the undefined contamination reported in both the soil and groundwater in <br /> MW-10. Shell must either prove the contamination in MW-10 is separate from the Shell <br /> plume, or define the extent of the contamination and use a fate and transport model such as <br /> Bioscreen, a freeware USEPA model, to show when all areas of the plume of contaminated <br /> groundwater will meet the CVRWQCB Water Quality Goals. <br /> If you have any questions please contact Lori Duncan at (209) 468-0337 or by email at <br /> Iduncan@sjcehd.com. <br /> Sincerely, <br /> ZaLori Duncan, Senior REHS Mre Lagorio, RE S <br /> Senior Registered Environmental Health Specialist Program Coordinator <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova CA 95670 <br /> Aubrey Cool, CRA, 5900 Hollis Street Suite A, Emeryville, CA 94608 <br />