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San Joaquin County <br /> OPQulN C Environmental Health Department DIRECTOR <br /> z• J--�a--� i 1868 East Hazelton Avenue Donna Heran,REHS <br /> AStockton, California 95205-6232 PROGRAM COORDINATORS <br /> .'Ab ` Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> c`•. P <br /> FpR�` Website; www,sjgov.org/ehd Kase Foley, REHS <br /> LindaTurkatte,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> December 28, 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 /> By electronic mail dated 13 December 2012 your consulting firm, Stantec Consulting <br /> Corporation (Stantec), informed the San Joaquin County Environmental Health Department <br /> (EHD) that the bi-weekly "oxygen injections should cease" at the end of 2012 based on <br /> Stantec's review of the most recent groundwater data. Stantec also informed the EHD that <br /> quarterly groundwater -monitoring and sampling would continue and a closure request <br /> pursuant of the Low Threat Closure (Policy) Guidelines (LTCP) would be prepared. <br /> Based on the data from the third quarter sampling event in July 2012, the EHD concurs with <br /> Stantec's determination that oxygen injections should be terminated and that site conditions <br /> may warrant closure consideration. Please submit a closure summary report that shows how <br /> the site meets all the LTCP criteria and that includes the data listed in Table 1 of Appendix A <br /> of.the Tri-Regional Guidelines. While all items in Appendix A should be addressed, the EHD is <br /> particularly interested in the following to facilitate closure consideration: <br /> • Cross sections, or reference to reports containing cross sections, that show <br /> correlated soil lithologies, contaminant concentrations, lateral and vertical extents of <br /> impacted soil and groundwater, and contaminant migration pathways; <br /> • Tables of current and historical soil and groundwater data; <br /> • Calculations showing current estimates of the residual dissolved and adsorbed total <br /> petroleum hydrocarbons as gasoline (TPH-g) and methyl tertiary-butyl ether (MTBE) <br /> contaminant masses and an estimate of the total TPH-g and MTBE masses removed; <br /> • An estimate of the future impact to groundwater from adsorbed contaminants; <br /> An estimate of the projected maximum plume extent resulting from the modeled <br /> additional impact of groundwater; and <br /> 4 An estimate of when site conditions will meet water quality objectives (WQOs). <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 />