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J&L Market 2 - 4 March 2009 <br /> 8125 S. EI Dorado St. ON <br /> Stockton, San Joaquin County <br /> recommendation concerning plume definition, either for installation of additional wells <br /> (with an included Well Installation Workplan) to complete delineation; or if the report <br /> provides a plume delineation complete conclusion, include supporting data, figures, <br /> and geologic cross sections showing the known limits of the plume. <br /> • There are adequate existing monitoring wells to determine the effects of an ozone <br /> injection pilot study. Since the subsurface lithology is similar to sites in San Joaquin <br /> County where laboratory bench scale tests (and pilot studies) have been successful, <br /> a pilot study in the core of the plume should determine the effects of ozone injection. <br /> Therefore, by 30 April 2009, submit a Pilot Study Workplan for ozone injection. <br /> • In addition to the second quarter 2009 monitoring report and well installation workplan <br /> (if applicable), a Pilot Study Report is also due 30 July 2009. <br /> If you have any questions, you may call me at (916) 464-4615 or email me at <br /> jbarton@waterboards.ca.gov. <br /> James L. L. Barton, P.G. <br /> Engineering Geologist <br /> cc: Mr. Mark Owens, SWRCB, UST Cleanup Fund, Sacramento <br /> Mr. Michael Infurna, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Todd Hafner, ATC Associates, Inc., Modesto <br />