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09 October 2000 <br /> AGE-NC Project No 96-0232 <br /> Page 2 of 2 <br /> contain two 2,500-pound granular activated carbon (GAC) absorption vessels designed to adsorb TPH-g, <br /> TPH-d and BTEX compounds, the final stage of treatment will contain two 2,500-pound SunSolve <br /> absorption vessels designed to adsorb methanol, ethanol, MTBE, 1,2-DCA and TBA <br /> Treated water will be discharged into a conveyance ditch located approximately 500 feet south of the site <br /> via underground pipe, the conveyance ditch discharges into the Wlutc Slough Zhe designed flow of the <br /> treatment and disposal systems is for 25 GPM <br /> Sampling ports would be installed to monitor the influent and effluent of the pre-treated water from the Flag <br /> City Chevron site Furthermore, receiving water monitoring stations (R-1 and R-2) would be set up 50 feet <br /> upstream and 50 feet downstream from the point of discharge into your canal to morutor the effluent and the <br /> general water conditions of the canal Prior to any discharge, an effluent motutoring and sampling program <br /> would be pre-approved by the California Regional Water Quality Control Board - Central Valley Region <br /> To demonstrate compliance with the RWQCB General Order No 5-00-119, Flag City Chevron will follow <br /> the RWQCB's Monitoring and Reporting Program in Attachment R of General Order No 5-00-119 for <br /> Receiving Water Monitoring standards Receiving water monitoring will include monthly field measurements <br /> and observations for the presence or absence of dissolved oxygen, suspended matter, discoloration, bottom <br /> deposits, aquatic life, sheen, visible film, fungi and any potential nuisance conditions Field measurements <br /> . and observations will be recorded in notebooks and reported in quarterly reports and submitted to the <br /> RWQCB <br /> Based on modeling calculations of the Flag City Chevron subsurface impacted ground water plume, AGE <br /> estimates that discharge into Canal No DPC-79 would be desired for approximately two years <br /> All interested parties have two weeks from the date of this letter to submit comments to the RWQCB All <br /> correspondence should be sent to the following address <br /> California Regional Water Quality Control Board -Central Valley Division <br /> 3443 Routier Road, Suite A <br /> Sacramento,California 95827-3003 <br /> Attention Mr Marty Hartzell <br /> If you have any questions or comments, please contact the undersigned at (209) 467-1006 <br /> Sincerely, <br /> Advanced Geo Environmental, Inc. <br /> Timothy J u ar <br /> . Project Geologist <br /> Adv"ced GcoEnvironmental,Inc_ <br />