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California Regional Water Quality Control Board <br /> ' '° <br /> Central Valley Region <br /> Robert Schneider Chair <br /> Alan C.Lloyd,PhD �i t+ <br /> arzenegger <br /> Secretary for Sacramento Main Office 'r rnor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 _ ,*a <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670.6114 OCT 1 9 2005 <br /> Phone(916)464-3291 <br /> ENVIROMMENT HEALTH <br /> 17 October 2005 PERMIT/SERVICES <br /> Mr. Ken Hillard <br /> 7-Eleven Corporation <br /> P.O.Box 711 <br /> Dallas, TX 975221-0711 <br /> REPORT REVIEW, 7-ELEVENSTORE#14177, 2725 COUNRTY CLUB BOULEVARD,STOCKTON, <br /> SAN JOAQUIN COUNTY, <br /> I reviewed the 31 August 2005 Soil Analytical Results and Evaluation of Potential Oxidation Reactions(Report), <br /> submitted by SECOR International Inc. (SECOR)on behalf of 7-Eleven Corporation. The Report supplements <br /> the 22 July 2004 and 31 August 2004 pilot study work plan Field Test Program for Evaluation of Oxidation <br /> Capacity of Groundwater(Workplan) with a geochemical evaluation of one soil sample, as required by my letter <br /> of 4 October 2004. The Workplan proposes batch oxygen injection into a new 2"well (I-1)from a compressed <br /> gas bottle into the aquifer,to enhance the bio-degradation of petroleum hydrocarbons. The Report concludes: <br /> "Based on the soil analysis and evaluation of the data, there are no constituents present in the soil that, if <br /> oxidized by injection of oxygen, will produce detrimental impacts to groundwater quality or aquifer <br /> characteristics." <br /> The pilot study is approved as written with the following conditions: <br /> • During the Pilot Study phase, groundwater sampling and analyses for constituents of concern, including <br /> metals and general minerals,will be conducted in injection well I-1 and monitoring well MW-1 <br /> immediately before each oxygen injection, and after each oxygen injection. <br /> • Install a data logger in MW-1 to record changes in dissolved oxygen,pH, specific conductance, and <br /> temperature during the Pilot Sfudy. The test data will be helpful to determine the effectiveness of oxygen <br /> injection. <br /> Please procure the appropriate drilling permits prior to mobilization, and provide San Joaquin County <br /> Environmental Health Department and myself at least 3 working days notice prior to commencement of <br /> fieldwork. You may call me at(916)464-4615 or email me at ibartongwaterboards.ca.gov for questions or <br /> additional information. <br /> �AMES L. BARTON,/P.G. <br /> Engineering Geologist <br /> cc: Mr. Mark Owens, UST Cleanup Fund, SWRCB, Sacramento <br /> Mr. Mike Infurna, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Jeff Aucherlonie and Mr. Daniel Davis, SECOR International Inc.,Rancho Cordova <br /> California Environmental Protection Ageizcy <br /> �a RecyctedPaper <br />