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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> ,�Pf co Donna Heran, REHS <br /> 600 East Main Street <br /> F Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> r Robert McClellon,REHS <br /> • Jeff Carruesco,REHS,RDI <br /> Kasec P Website: www.sjgov.org/ehd Foley, REHS <br /> q<<F b R Linda Turkatte, REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> February 2, 2012 <br /> Mr. Ken Hilliard <br /> 7-Eleven, Incorporated <br /> Post Office Box 711 <br /> Dallas, Texas 75221-0711 <br /> Subject: 7-Eleven Store No. 19976 <br /> 1399 North Main Street <br /> Manteca, California 95336 <br /> The San Joaquin County Environmental Health Department (EHD) received groundwater <br /> analytical results for the fourth quarter 2011 and the first quarter 2012 sampling events at the <br /> above referenced site from your consulting firm, Stantec Consulting Corporation (Stantec), by <br /> electronic mail dated 27 January 2012. Concentrations of contaminants of concern have <br /> increased significantly in groundwater collected from monitoring well MW-2 since oxygen <br /> injections were terminated in July 2011. <br /> Stantec recommended that oxygen injections resume, focusing specifically on targeting <br /> MW-2. The EHD concurs with this recommendation and directs that groundwater be collected <br /> only from MW-2 following the first and second months of resuming oxygen injections. Please <br /> submit the results to the EHD within thirty days of completing the second round of sampling. <br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) 468- <br /> 9852, or by email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L McCartney,t I�S Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Ed Simonis, PG, Stantec Consulting Corporation, 3017 Kilgore Road, Suite 100, Rancho <br /> Cordova, California 95670 <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 />