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California Sgional Water Quality CdArol Board <br /> Central Valley Region <br /> Karl E. Longley, SCD, P.E., Chair <br /> Arnold <br /> Linda S. Adams 11020 Sun Center Drive#200, Rancho Cordova, California 95670-6114 Schwarzenegger <br /> Secretary for Phone (916)464-3291 • FAX (916)464-4645 Governor <br /> Environmental http://www.waterboards.ca.gov/centralvalley <br /> Protection R�(„-, ED <br /> 21 January 2009 �N 22\2��9 <br /> Mr. Dale Gillespie <br /> Geweke Land Development and Marketing ENP R'�ft T SN 'HEALTH <br /> FiVICES <br /> PO Box 1210 <br /> Lodi, CA 95241 <br /> DOCUMENT REVIEW, CLEANUP AND ABATEMENT ORDER (CAO) NO. 93-701, <br /> GEWEKE PROPERTY, 16 SOUTH CHEROKEE LANE, LODI, SAN JOAQUIN COUNTY <br /> I reviewed the Quarterly Report— Fourth Quarter 2008 (Report), received 9 January 2009 and <br /> submitted on your behalf by Advanced GeoEnvironmental, Inc. (AGE). The Report provides the <br /> analytical results from the groundwater monitoring event conducted 6 November 2008 at your site. <br /> Depth to water varied from 61 to 64 feet below ground surface. The downgradient groundwater <br /> direction was towards the south at a varying gradient of 0.002 ft/ft (onsite) to 0.004 ft/ft (offsite). <br /> Maximum groundwater concentrations in micrograms per Liter (ug/L) were reported in offsite <br /> monitoring well MW-9 as Total Petroleum Hydrocarbons as gasoline, 5,600 ug/L; ethylbenzene, <br /> 43 ug/L; and xylenes, 56 ug/L. The Report states the groundwater treatment (ozone injection) system, <br /> which was suspended temporarily in January 2007 for a rebound test and restarted in April 2007 due to <br /> significant rebound in concentrations onsite and in MW-9 offsite, has continued to be effective for <br /> reductions in concentrations for constituents of concern. The Report recommends continued <br /> groundwater monitoring under CAO No. 93-701; a temporary shutdown of the onsite ozone injection <br /> system for a rebound test prior to, and during, the previously approved six month's long Oxygen <br /> Releasing Compound® (ORC) pilot study near offsite MW-9; and a contingency plan to evaluate the <br /> necessity for restarting the ozone injection system, if groundwater concentrations rise significantly <br /> during the pilot study, or if there are delays to the anticipated February 2009 start of the pilot study. <br /> The shut down of the ozone injection system for a rebound test is appropriate at this time and <br /> conditionally approved. If contaminant rebound occurs in groundwater during the first quarter of 2009 <br /> or in subsequent quarters, then contact me as soon as possible by phone or email, to discuss <br /> restarting the ozone injection system. Please acquire all necessary permits and access agreements, <br /> and give the San Joaquin County Environmental Health Department and myself at least three working <br /> days notice prior to initiating fieldwork. If you have any questions you may contact me at <br /> (916) 464-4615 or by email at jba�rttoonn@waterboards.ca.gov. <br /> James L. L. Barton, P.G. <br /> cc: Mr. Mark Owens, UST Cleanup Fund, SWRCB, Sacramento <br /> Mr. Harlin Knoll, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Brian Millman, Advanced GeoEnvironmental, Incorporated, Stockton <br /> California Environmental Protection Agency <br /> Qd Recycled Paper <br />