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<br />5. Shucy <br />May 28, 2003 <br />Page 2 of 2 <br />groundwater to the north of the ttrinirrg area will be controlled by the installation of two trenches south <br />of the phrrae, whioh will be filled with water to provide a positive hydraulic head to prevart <br />contamination fiom entering the dewatering pits. Contaminated sail will ba removed 1Yom the tttining <br />area to landfarma for treatment outside the permit boundary. Existing dissolved groundwater <br />contamination at the site is minimal (low levels of benzene, no RCRA metals above State groundwater <br />standards), is orders ofmagnitude below the Colorado Discharge Permit liritita issued for the site, and <br />w111 likely be tttmedlalrxl by aeratiuu du<iuB 1~P~g• <br />In summary, implementation of this revised muting plan sa designed, and management and monitoring <br />of oontaninatod media during training as required in accordance with the Waste Management <br />Contingaacy Plan (WMCP) and the Colorado Discharge Permit, should allgw mining to proceed with <br />little chance of adverse impact. In fact, mining should roault in significant blear up of the area with the <br />removal of oontaminatod coil for treatment, Additlonsilly, a portions e£the revemres generated from the <br />gravel mining will be dcpositad into the existing Escrow Account for the site that is administered by the <br />Department sad will be used to clean up other portions of the refinery. Wa (believe, therefore, that <br />gravel mining is appropriate for the site, can proceed and be managed in an~arvirotrmeatally sound <br />manner under this revised plan, and that the operations will sat only aid the overall cleanup of the <br />• refinery, but will be boneficiel to the Community is general. <br />The Division appreciator the opportunity to have reviewed this application, If you have any questions <br />or require any additional information, please do not hesitate to contact me dt {303) 692.3376. <br />Sincerely, <br />?ereaa J. Bennett <br />Hazardous Waste Comactive Action lJnit <br />Compliance Program <br />Attachment <br />Cc: Harold Elam, Elarrt Construction, Inc. <br />Keith Holdor, FMM <br />Greg I.ervicki, Le~vicki and Associates <br />David Kreutzer, Colorado AGO <br />Clrria Gates, CDPHE/WQCD <br />Walter Avramenko, CDPHE/HIviWMD <br />Paul Creeden, CDOW <br />u <br />