Laserfiche WebLink
Chevron Station #9-5775 -3 - <br />30.1 W. Kettleman Lane, Lodi <br />15 April 2005 <br />hydraulic control. By 1 August 2005 a report of the results of this work should be submitted to <br />Regional Board staff for evaluation of plume stability. <br />Letter <br />The Letter recommends two additional quarters of groundwater monitoring after the conclusion <br />of the rebound test. I concur. If the plume remains stable and concentrations continue to decline <br />over the two quarters, then I recommend that the Responsible Parties may submit a Closure <br />Report written according to the Appendix A — Reports, Tri -Regional Board Staff <br />Recommendations for Preliminary Investigations and Evaluation of Underground Storage Tank <br />Sites, April 2004 and the No Further Action Checklist. <br />The Letter says if the significant rebound occurs, showing that the plume is not stable, then the <br />GWP&T system will be restarted and a Pilot Study for the feasibility of a Hydrogen Peroxide <br />(H202)injection should be started. Under those conditions I agree to restart the GWP&T. <br />However I recommend a Bench Scale Study prior to field implementation of a Pilot Study for <br />H2O2, due to the need for Regional Board staff to evaluate potential detrimental effects <br />(including possible production of hexavalent chromium) from insitu chemical oxidation prior to <br />injecting H2O2 into the aquifer, per the SECOR Work Plan for Hydrogen Peroxide Bench -Scale <br />Study, dated 24 September 2005 as modified by my letter of 8 October 2005. A Bench Scale <br />Study could be useful to determine if Waste Discharge Requirements are necessary, and helpful <br />for designing the optimal volume and concentration of H2O2 required to remediate any residual <br />hydrocarbon contamination.. <br />Routine quarterly monitoring should continue until directed otherwise by this office. <br />California Environmental Protection Agency <br />C4 Recycled Paper <br />