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California gional Water Quality Con>�1 Board :i <br /> o , Central Valley Region s� i1 <br /> 4 f <br /> Robert Schneider, Chair <br /> QaArnold <br /> Linda S.Adams Sacramento Main office Schwarzenegger <br /> Seri elaryfor 11020 Sun Center Drive 9200,Rancho Cordova,California 95670-6114 Governor <br /> F.neironmenml Phone(916)464-3291 •FAX(916)464-4645 <br /> Proleclio), hlip://www.ivaterboaTds.ca.gov/centralvalley <br /> nCD <br /> 21 July 2006 RECENED <br /> .II II- 9 5 2006 <br /> Mr. Dale Gillespie <br /> Geweke Land Development and Marketing ENVIRONMENT HEALTH <br /> PO Box 1210 PERMIT/SERVICES <br /> Lodi, CA 95241 <br /> REPORT REVIEW, CLEANUP AND ABATEMENT ORDER (CAO) NO. 93-701, <br /> GEWEKE PROPERTY, 16 SOUTH CHEROKEE LANE, LODI, SAN JOAQUIN COUNTY <br /> I reviewed the 21 July 2005 Quarterly Report— Second Quarter 2006 (Report), which included the <br /> Ground Water Batch Removal Work Plan (Workplan) submitted on your behalf by Advanced <br /> GeoEnvironmental, Inc. (AGE). The Report (see enclosed Figures 2 through 5 and Table 3) provides <br /> the analytical results from the groundwater monitoring event conducted 6 June 2006 at your site. Depth <br /> to water varied from 56 to 58 feet below ground surface. The downgradient groundwater direction was <br /> towards the south at a varying gradient of 0.002 ft/ft (onsite) to 0.004 ft/ft (off-site). Maximum <br /> groundwater concentrations were: Total Petroleum Hydrocarbons as gasoline, 420 Ng/L in monitoring <br /> well MW-8, onsite and 560 Ng/L in MW-9, off-site; and 1,2-dichloroethane, 7.6 pg/L in MW-9, offsite. All <br /> other results for constituents of concern in groundwater are currently below Water Quality Objectives. <br /> The Report states the ozone injection system is increasing groundwater Oxidation Reduction Potential <br /> and Dissolved Oxygen levels, while reducing concentrations of constituents of concern. The Report <br /> recommends: <br /> • Continued operation of ozone injections system, <br /> • Continued groundwater monitoring, and <br /> • Approval of the Workplan for the MW-9 batch groundwater extraction of up to 1,800 gallons. <br /> The Workplan is approved with the following modifications: <br /> • Monitor water levels in MW-8, EW-1 and MW-11 to determine what effect the pumping has on <br /> shallow groundwater, <br /> • Collect Dissolved Oxygen and Oxidation Reduction Potential readings from MW-8, MW-9, EW-1 <br /> and MW-11 before and after the pumping event, <br /> Step up the extraction rate for MW-9 if possible, to increase the batch volume, and <br /> Provide a report of the completed work in the next Report (Third Quarter 2006). <br /> F�you have any questions you may contact me at (916) 464-4615 or jbarton@waterboards.ca.gov <br /> James L. L. Barton, P.G. <br /> Enclosures <br /> cc: Mr. Mark Owens, UST Cleanup Fund, SWRCB, Sacramento <br /> Mr. Harlin Knoll, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Robert Marty, Advanced GeoEnvironmental, Incorporated, Stockton <br /> California Environmental Protection Agency <br /> pp• Recycled Paper <br />