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River City Petroleum 2 - 22 August 2007 <br /> Connell Motor Lift Truck <br /> Stockton, San Joaquin County <br /> constituents currently being detected. Also, if a constituent was previously deleted after <br /> being non-detect for at least 4 consecutive quarters, do not analyze and report that <br /> constituent at this time. Note that for the USEPA Method 8260, all detected peaks <br /> must be reported for the constituents of concern. <br /> 2. The Report mentions that SVE influent concentrations will continue to decline and <br /> provides a graphic representation of the data in Appendix G. Please provide an <br /> assessment of the SVE system, including an estimate when SVE influent <br /> concentrations will reach an asymptotic level, with recommendations for optimization of <br /> the existing SVE system or additional SVE treatment wells in the next quarterly report, <br /> which is due 1 October 2007. <br /> 3. The Report states the reductions in benzene, toluene, ethylbenzene, xylenes <br /> concentrations in the former Underground Storage Tanks source area may be <br /> attributed to the effectiveness of the Air Sparging (AS) system to date. <br /> On 22 January 2007, my letter approved a workplan for a 24-week AS pilot study. <br /> The Report Table 1 shows that the AS pilot study commenced on 10 April 2007, and <br /> will reach its conclusion on 24 September 2007. Therefore, the Corrective Action Plan <br /> (CAP), which is now due 31 December 2007, shall include a detailed assessment of <br /> the effectiveness of the AS pilot study. Also, provide an interpretation of the individual <br /> and group well constituent concentrations versus time graphs, which were also included <br /> in the Report Appendix G but not discussed in the text. The CAP should evaluate at <br /> least two alternative remedial options to SVE/AS, and give recommendations for <br /> expansion of the SVE/AS system or provide a recommendation for remedial <br /> alternatives to SVE/AS. <br /> If you have any questions, please contact me at (916) 464-4615 or by email at <br /> jbarton@waterboards.ca.gov. <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> cc: Mr. Mark Owens, State Water Resources Control Board, UST Cleanup Fund, Sacramento <br /> Mr. Michael Infurna, San Joaquin County Environmental Health Services, Stockton <br /> Ms. Ally Colavita, Advanced GeoEnvironmental Inc., Stockton <br />