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� i <br /> ERI 205505 R02 Tosco Service Station 5886 Stockton, California September 25 2001 <br /> 51 "C-S ar a"T"' Ozone MicrosRarging Remediation System <br /> The proposed groundwater treatment system will consist of a K-V Associates, Inc (KVA) "C- <br /> Sparge"TM ozone microsparging system Literature on the KVA "C-Sparge" ozone microsparging <br /> system is provided in Attachment D The system will utilize ten KVA Spargepoints wells with piping <br /> ' connected to a "C-Sparge"T"' panel The "C-Sparge"TM panel ,Includes an ozone generator, air <br /> compressor, and programmable timer/controller The system will also include a ten valve manifold so <br /> that air sparging to each well can be independently controlled from the remediation compound All <br /> system piping will be located underground and traffic-rated well covers will be placed above each <br /> sparge well for easy access The approximate location of the sparge wells and anticipated ROI for each <br /> well (30 feet) are shown on Plate 6 ERI proposes that each sparge point boring be drilled to <br /> approximately 20 to 30 feet bgs The approximate details of the proposed sparge wells are shown on <br /> Plate 7 The actual well locations and depth will be determined later The effectiveness of the <br /> remediation system will be evaluated using dissolved hydrocarbon concentrations in groundwater <br /> samples collected during quarterly groundwater monitoring and sampling events <br /> 52 Estimated Cleanup Time <br /> 1 <br /> The microsparging is anticipated to continue approximately 24 months or until groundwater / <br /> concentrations decrease to asymptotic levels ERI will then evaluate the site for case closure <br /> i60 REFERENCES <br /> Bartow, J Alan, 1985 Map and Cross Sections Showing Tertiary Stratigraphy and Structure of the <br /> Northern San Joaquin Valley, California Department of the Interior, United States Geological Survey <br /> Miscellaneous Field Studies Map MAP MF-1761 <br /> Delta Environmental Consultants, Inc February 6, 1996 Environmental Investigation Report, Unocal <br /> Service Station No 5886, 2701 West March Lane, Stockton, California D095-066 <br /> Delta Environmental Consultants, Inc December 5, 1996 Additional Hydra eolo�ssessment <br /> Results, Unocal Service Station No 5886, 2701_West March Lane, Stockton, California D095-066 <br /> Environmental Resolutions, Inc March 28, 1997 Work Plan for Su lemental Environmental <br /> Investigation at Unocal Service Station 5886, 2701 March Lane, Stockton, California <br /> ERI 205503 W01 _ - <br /> 8 <br />