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California Re nal Water Quality C•trol Board <br /> Central Valley Region WEL�� VDD b, <br /> Robert Schneider,Chair V Gray Davis <br /> Winston H.Hickox Governor <br /> Secretaryfor Sacramento Main Office AUG 2 7 20OZ <br /> Environmental Internet Address: http://w .swrgb.ca.gov/mgcb5 <br /> Protection 3443 RouPho e(9 6)255-3000•FAX(9 6)255-3015 Suite A,Sacramento,California 1827 3003 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> 26 August 2002 <br /> Mr. Cecil Dillon Mr.Richard Bokides Mr.Navtej Dhingsa <br /> Flag City Ltd.Partnership Bokides Family Ltd. Part. First Invest.Flag City,Inc. <br /> 1820 W.Kettleman Lane, Suite E 6421 Capitol Avenue 5517 Coronawood Lane <br /> Lodi, CA 95242 Lodi,CA 95242 Carmichael,CA 95608 <br /> REVIEW QUARTERLYMONITORING REPORT, FLAG CITY CHEVRON, 6421 CAPITOL AVENUE, <br /> LODI,SAN JOA QUIN COUNTY, CLEANUP AND ABATEMENT ORDER(C&A) NO. 5-00-700 <br /> Board staff reviewed the 15 July 2002 Quarterly Report—Second Quarter 2002 (Q2-2002 Report) submitted by <br /> Advanced GeoEnvironmental,Incorporated(AGE) for the Flag City Chevron site. The Q2-2002 Report presents <br /> a summary of quarterly monitoring and remedial activities completed in April through June 2002, and documents <br /> decreasing trends of MtBE contamination in on-site monitoring and extraction wells due to continued <br /> groundwater extraction and treatment. <br /> We have the following comments on the Q2-2002 Report: <br /> 1. Approximately 1,075,700 gallons of groundwater was extracted and treated during the second quarter of <br /> 2002, and AGE reports that MtBE,the only constituent identified in the influent samples,ranged from 19 to <br /> 33 µg/l. (The maximum MtBE concentration identified in extraction wells during this sample event was <br /> 29 µg/1.) Approximately 0.22 pounds of MtBE was removed from groundwater during the second quarter, <br /> and a graph of the cumulative MtBE mass removal included in the Q2-2002 Report shows the mass removal <br /> rate is flattening out. <br /> Based on this information,Board staff believe that if remedial rates from all extraction wells and the <br /> combined influent concentrations have reached asymptotic levels,the system should be shut down to <br /> determine if rebound of the contaminants will occur. If the concentrations of contaminants in the individual <br /> groundwater wells rebound,additional operation of the remedial system is warranted. <br /> 2. As requested in our 28 February 2002 letter,AGE completed monthly groundwater measurements for April, <br /> May,and June, and prepared monthly contour maps. The data show that there is a relatively flat gradient <br /> across the site, and a dominant groundwater flow direction is not evident. First and second aquifer zones in <br /> the area of the Flag City Chevron site are being influenced by the groundwater extraction and treatment <br /> system. The results of the vertical gradients show a general upward groundwater flow from the second to the <br /> first aquifer zones. Monthly water level measurements are no longer necessary;however,please continue to <br /> report vertical gradients at monitoring wells MW-11 and MW-9 on a quarterly basis. <br /> California Environmental Protection Agency <br /> co Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a Iist of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/mgcb5 <br />