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I <br /> M San Joaquin County DIRECTOR <br /> oDepartment <br /> DonnaHeran,RENSentaea� <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotwla, REHS <br /> " Stockton, California 95202-3029 <br /> 1 . <br /> PROGRAM COORDINATORS <br /> '." .' Mike Huggins,REHS, RDI' <br /> ogcr o�`P Website: www.Vgov.org/ehd Margaret Lagorio, REHS <br /> P 209 46$•3420 Robert McClellon, REHS <br /> Phone: <br /> ( )- Jeff Carruesco, REHS, RDI <br /> Fax: (209)464-013$ Kasey Foley,REHS <br /> April 6, 2009 <br /> Mr. Denis L.Brown <br /> Shell Oil Products US. <br /> i 20945 South Wilmington Avenue <br /> Carson, CA 90810 <br /> Subject: Former Shell-branded Service Station- . <br /> 1160 West Yosemite Avenue <br /> Manteca, California 95337 <br /> The San Joaquin County Environmental Health- Department (EHD) has reviewed groundwater <br /> monitoring reports through 2008 for the above-referenced site. Gasoline constituents continue-to'be <br /> detected in groundwater collected from monitoring wells MW-1, MW-3, and MW-4 and there appears <br /> to be possible correlation between depth-to-groundwater and concentration ofpetroleum-Contaminants <br /> detected in groundwater. Based on,the fate and transport model VLEACH (Version 2.2.03) submitted <br /> to the EHD in October 2006, the highest concentration of total petroleum hydrocarbon quantified as <br /> gasoline (TPHg) detected in groundwater will occur after twenty years at 25,122 micrograms per liter <br /> (pg/L). Based on these observations and the lack of site investigation west/northwest of the source due <br /> to structural and traffic limitations, the EHD directs that a corrective action plan for site remediation be <br /> submitted by June 19, 2009, that -includes several feasible remedial technologies.. The recommended <br /> remedial technology should be well supported by applicability to site characteristics and an analysis for <br /> cost-effectiveness. <br /> Please contact Vicki McCartney at (209)-468-9852 or by email at vmcearmev(rsjcelid.com, if you <br /> have any questions regarding this letter. <br /> Sincerely, <br /> Victoria L. McCartney, REHS <br /> � Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Ms.Aubrey Cool, PG, Conestoga-Rovers & Associates, 5900 Hollis Street, Suits A, Emeryville, <br /> California 94608 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br /> 1 <br />