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A , <br /> California logional Water Qualityfontrol Board <br /> Central Valley Region <br /> a. I <br /> Robert Schneider,Chair <br /> Winston H. for Gray Davis <br /> EnvSecironmental <br /> Sacramento Main Office Governor <br /> Environmentn! Internet Address: http://www.swrcb.ca.gov/mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 15 June 2001 <br /> Mr. Dale Gillespie <br /> Geweke Land Development and Marketing <br /> PO Box 1210 <br /> Lodi, CA 95241 - <br /> QUARTERL Y MONITORING REPORT REVIEW <br /> GEWEKE PROPERTY, 16 SOUTH CHEROKEE LANE, LODI, SAN JOA QUIN COUNTY <br /> CLEANUP AND ABATEMENT ORDER (C&A)NO. 93-701 <br /> Board staff reviewed the 25 April 2001 Groundwater Monitoring Report—First Quarter 2001 (QMR) <br /> submitted by Advanced GeoEnvironmental, Incorporated (AGE) on behalf of Geweke Land <br /> Development and Marketing(Geweke). <br /> Background <br /> In August 1994, Geweke initiated an in-situ bioremediation program at this site by inoculating source <br /> area soils with bacteria and nutrients to remediate on-site contamination. In 1996, Geweke requested to <br /> modify the bioremediation program by adding additional nutrients and hydrogen peroxide; however, the <br /> necessary waste discharge requirements (WDRs) were never completed. Currently, the total petroleum <br /> hydrocarbon as gasoline (TPHg) and benzene groundwater plume covers approximately the same area as <br /> in August 1994. <br /> OMR Review <br /> The groundwater flow direction has been to the southwest, and concentrations of TPHg and BTEX in <br /> monitoring wells have remained relatively constant for the last four quarters of monitoring. Tertiary <br /> butyl alcohol (TBA) was identified in downgradient monitoring well MW-9 at 45 µg/1, and <br /> 1,2-dichloroethane (1,2-DCA) was identified in downgradient monitoring well MW-12 at 2.8 gg/i for <br /> the first time. <br /> The QMR included concentration time-series graphs for TPHg and benzene at selected wells. Most <br /> wells showed stable concentrations for the last decade of monitoring; however, monitoring well MW-8, <br /> approximately 100 feet downgradient of the former underground storage tanks (USTs), shows increasing <br /> TPHg concentrations. This increase in groundwater concentration may be the result of increasing water <br /> levels over the last four to five years,hydrating petroleum-impacted soils. <br /> Board staff met with AGE on 6 June 2001 to discuss the QMR, site remediation activities, and future <br /> site work. It was agreed that the in-situ bioremediation program reduced soil contamination, but was <br /> ineffective in reducing groundwater contamination to the point where the site can be considered for <br /> California Environmental Protection Agency <br /> ea Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://w .swrcb.ca.gov/mgcb5 <br />