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California Regional Water Quality Control Board <br /> Central Valley Region t l <br /> f <br /> Terry Tamminen Robert Schneider Chair <br /> Secretary for Sacramento Main Office Arnold Schwarzenegger <br /> Environmental Internet Address: http:// w .swrcb.ca.gov/mgcb5 Governor <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 <br /> 19 July 2004 <br /> David Li <br /> Environmental Manager REE VRD <br /> Marley Cooling Technologies 7nnl <br /> 200 N. Wagner Avenue <br /> Stockton, California 95215 <br /> FIRST QUARTER 2004 GROUNDWATER MONITORING REPORT, IN-SITU CHROMIUM <br /> RED UCTION PILOT STUDY, FORMER MARLEY COOLING TOWER FACILITY, STOCKTON, <br /> CALIFORNIA <br /> The Regional Water Quality Control Board(Regional Board) staff have reviewed the First Quarter 2004 <br /> Groundwater Monitoring Report, In-situ Chromium Reduction Phase I Pilot Study, received on <br /> 30 April 2004, prepared by MWII Americas, Inc. on behalf of SPX Corporation and Marley Cooling <br /> Technologies. This report is submitted in accordance with Provision D.2 of the Regional Board Waste <br /> Discharge Requirements (WDRs) Order No. R5-2003-0100 which stipulates that the Phase I results and <br /> recommendations must be submitted for Regional Board review and concurrence prior to start of any <br /> field activities for Phase II of the pilot study. <br /> The report includes groundwater monitoring results (for June 2003 through April 2004 period), results, <br /> evaluation, and recommendations from Phase 1 of the pilot study for In-situ chromium reduction in <br /> groundwater. Phase I of the pilot study was implemented in June 2003 and is the first of two Phases (I <br /> and II). Phase I consisted of injection of calcium polysulfide (reductant) and ethanol (carbon source) in <br /> the shallow groundwater at one location (INJ-1) and Phase II is planned for calcium polysulfide and <br /> ethanol injection at multiple locations. SPX Corporation is requesting Regional Board concurrence for <br /> implementation of Phase II of the pilot study, with some revisions to the proposed injection locations <br /> and test wells, based on groundwater monitoring results and evaluation of the Phase I pilot study. <br /> Provided below is a brief description of the Phase I pilot study results and the proposed Phase II pilot <br /> study followed by our comments on the report. <br /> Phase I: The purpose of the study was to demonstrate that injecting calcium polysulfide and ethanol <br /> into groundwater will effectively reduce hexavalent chromium to trivalent chromium, and to assess the <br /> radius of influence of a single injection point. The results of the Phase I pilot study indicate that the one- <br /> time injection of calcium polysulfide and ethanol at one injection point (INJ-1) has been successful in <br /> reducing hexavalent chromium concentrations in groundwater to non-detectable levels (less than 5 <br /> micrograms/liter) within 138 days of injection (to a radius of 22 feet from the injection point). <br /> Measurement of oxidation reduction potential (ORP), a measure of oxidizing or reducing conditions in <br /> the saturated zone, in the test wells (TW-1, TW-2, TW-3, TW-5, and TW-6) surrounding the injection <br /> California Environmental Protection Agency <br /> ped Recycled Paper <br />