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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> — � Donna Heran, REHS <br /> 600 East Main Street <br /> } ` Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon, RENS <br /> Jeff Carruesco, RENS, RDI <br /> • c• = rP Kase Foley,REHS <br /> FORS Website: www.sjgov.org/ehd rind REHS <br /> Phone: (209) 468-3420 Linda <br /> urkatte, REHS <br /> Fax: (209) 464-0138 <br /> April 16, 2012 <br /> Mr. Denis L. Brown Mr. Joseph P. Faso, etal <br /> Shell Oil Products USA 4453 Yacht Harbor <br /> HSE — Environmental Services Stockton, CA 95204 <br /> 20945 S. Wilmington Ave. <br /> Carson, CA 90810 <br /> Mr. Darin & Ms. Versus Collins <br /> 1036 W. Robinhood Drive, Suite 205 <br /> Stockton, CA 95207 <br /> Subject: Former Shell Service Station LOP Case#: 505602 <br /> 1267 Country Club Blvd. AP#: 113-042-17 <br /> Stockton, CA 95204 Global ID#: T0607700721 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site Investigation <br /> Report (Report) dated May 5, 2011, submitted on your behalf by Conestoga-Rovers & Associates <br /> (CRA). In the Report. CRA concludes that the horizontal extent of diesel and gasoline constituents <br /> in groundwater beneath and down gradient of the site is generally defined. In addition, CRA <br /> concludes that residual petroleum hydrocarbon concentrations do not pose a soil vapor intrusion <br /> risk and that no additional assessment is warranted, and requested the EHD to evaluate the site for <br /> case closure <br /> If you wish to have your site considered for closure, please provide a closure report that includes <br /> the following: <br /> 1. A calculation of the residual contaminant mass sorbed in both soil and dissolved <br /> groundwater. <br /> 2 A prediction of how long in years) it will be until the dissolved contaminant concentrations <br /> on site decline to water quality goals. <br /> 3 A discussion of the potential vapor intrusion threat from the residual contamination in both <br /> soil and groundwater. <br /> 4. Confirmation that a sensitive receptor survey has been completed for this site, and <br /> 5. All requirements of the Tri-Regional Guidelines Appendix A. <br /> If you have any questions please call Lisa Medina at (209) 468-3455, or by email <br /> Imedina si ehd.com. <br /> Lisa Medina, REHS Nuel C. Henderson Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c Mr. James L Barton. CVRWQCB, Underground Storage Tank Unit, 11020 Sun Center Drive, <br /> #200. Rancho Cordova, CA 95670-6114 <br /> Mr Marie Owens, SWRCB, Division of Clean Water Programs, Underground Storage Tank <br /> Program, P.O. Box 944212, Sacramento, CA 94244-2120 Mr. Tom Sparrowe, Conestoga- <br /> Rovers & Assoc.. 5900 Hollis St., Suite A, Emeryville, CA 94608 <br /> _.Ms. Penny Jasper or Mr. Phil Metzger. Bank of the West, 1450 Treat Blvd., Walnut Creek, CA <br />