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California Regional Water Quality Control Board , <br /> Central Valley Region <br /> Robert Schneider,Chair Gray Davis <br /> Winston H.Hickox Governor <br /> Secretaryfor Sacramento Main Office <br /> Environmental Intemet Address: http://www.swrcb.cagov/rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 28 February 2002 �a <br /> Mr.Richard Bokides Mr.Navtej Dhingsa 0' . <br /> Mr.Cecil Dillon r` <br /> Flag City Ltd.Partnership Bokides Family Ltd. Part. First Invest.Flag City,Inc.,,A <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, <br /> FLAG CITY CHEVRON, 6421 CAPITOL AVENUE,LODI,SANJOAQUIN COUNTY, <br /> CLEANUP AND ABATEMENT ORDER X")NO. 5-00-700 <br /> Board staff reviewed the 15 January 2002 Quarterly Report—Fourth Quarter 2001 (Q4-2001 Report)submitted <br /> by Advanced GeoEnvironmental,Incorporated(AGE)for the Flag City Chevron site. The Q4-2001 Report <br /> documents decreasing trends of MtBE contamination in on-site monitoring and extraction wells due to continued <br /> groundwater extraction and treatment. Concentrations of MtBE in on-site monitoring well MW-1 have decreased <br /> from a maximum of 5,700 micrograms per liter(µg/1)in June 2000 to<1.0 pg/l in December 2001. <br /> We have the following comments on the Q4-2001 Report: <br /> 1. AGE recommended continued quarterly monitoring and sampling coordinated with monitoring and sampling <br /> at Three B's Truck Plaza. We agree to continue monitoring and sampling;however, as presented in our <br /> 7 November 2001 letter, due to the decreasing trends documented in the historical groundwater monitoring <br /> tables a reduction in sampling frequency and constituents is appropriate. Board staff are available to meet <br /> with AGE to discuss a plan to reduce sampling frequency and constituents sampled. Please prepare a revised <br /> monitoring plan with justification for changes as a starting point for our discussion. <br /> 2. AGE also recommended continued selective groundwater extraction in alternating weekly shifts from the <br /> north trench line(extraction wells EW-5,EW-7,EW-8, and EW-10)to the south trench line (extraction wells <br /> EW-2, EW-4,EW-6, and EW-9). As presented in our 7 November 2001 letter,we suggested that extraction <br /> wells EW-4 and EW-5 should be operated continuously due to having the highest MtBE concentrations,and <br /> the remaining extraction wells with MtBE detections should be alternated weekly. I spoke with Mr.Tim <br /> Cuellar of AGE on 25 February 2002, and he stated that the extraction wells with the highest MtBE <br /> concentrations(currently EW-4 and EW-5) are being operated continuously, and the other extraction wells are <br /> being alternated weekly. Board staff believe that this plan of groundwater extraction is the most effective to <br /> reduce contaminant mass at the Flag City Chevron site. Please present a summary of the correct extraction <br /> well configuration in the Q1-2002 quarterly status report. <br /> 3. Total petroleum hydrocarbons as diesel(TPHd)was identified at five monitoring wells that historically have <br /> not shown TPHd. One of the five wells with TPHd is the sentinel well MW-10C with a screen interval of 70 <br /> California Environmental Protection Agency <br /> 0 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://www.swrcb.ca,gov/mgcb5 <br />