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Workplan for Additional Assessment and Feasibility Testing 5 <br /> 7-Eleven,Inc Store No 21758,853 East Yosemite Avenue Manteca CA October 17 2001 <br /> Vapor samples will be submitted for analysis by EPA Method 8015/8020 for TPH-G; benzene,toluene, <br /> ethylbenzene, and total xylenes(BTEX); and by EPA Method 8260 hfor MTBE and other oxygenates. <br /> Test data will be used to determine if vacuum application to the referenced well will result in significant <br /> production of hydrocarbon/MTBE-containing vapors, and what is (as applicable)the lateral radius of vapor <br /> extraction influence. <br /> SchedulelReport <br /> Feasibility testing will be conducted after additional well installation,1 and the report will be submitted <br /> concurrently with additional assessment information. <br /> Additional Feasibility Testing <br /> Based on SVE test data and vertical plume delineation information)oxygen/air sparging may also be <br /> evaluated as a remediation method for this site. Additional feasibility tests(including proposed treatment <br /> well locations/construction)will be proposed with SVE/additional assessment findings as an addendum to i <br /> this workplan. M <br /> If you have any questions or comments concerning this document,;please call our Concord office at(925) <br /> 288-9898. ' <br /> i <br /> Sincerely, 9D <br /> IT <br /> Gi <br /> IT Corporation IT Corporation V 0-.-0 i <br /> Submitted by: Approved by: 5 tED)k <br /> o <br /> z <br /> Shelby Lathrop Ed K. Simonis, RG a I Project Manager Senior Geologist W !Jt} 4422* CO i <br /> CACI 0g�` <br /> c: Mr. Harlin Knoll-San Joaquin Co.Public Health Services/Environmental Health Department <br /> Mr. Marty Hartzell-California.Regional Water Quality Control Board-CVR <br /> Attachments <br /> 1. Figures <br /> G <br /> I _ <br /> 21756SAW.DOC <br /> i <br /> s <br /> s <br />