Laserfiche WebLink
BBA <br />water consultants <br />• <br />BISHOP-BROGDEN ASSOCIATES, INC. <br />April 25, 2007 <br />Angela Bellantoni <br />Environmental Alternatives Inc <br />402 Valley Road, Suite G <br />Canon City, CO 81212 <br />Michael A. Sayler <br />Christopher J. Sanchez <br />Jeffrey A. Clark <br />Charles E. Stanzione <br />Robert E. Brogden <br />Re: Northfield Mine -Supplemental Hydrology Report and Response to November <br />28, 2006 Adequacy Review Letter, Northfield Mine, Permit No. C-2006-085 <br />Dear Angela: <br />• This letter supplements our hydrology report dated March, 2006 and presents the <br />additional information related to hydrology and wells requested in the November 28, <br />2006 Adequacy Review letter from the Division of Reclamation, Mining and Safety <br />(DBMS), and information requested in Fremont County's January 22, 2007 letter <br />regarding their Conditional Use Permit for the proposed coal mine. In order to prepare <br />this letter, we conducted additional research and analyses to address the questions <br />presented in the above-referenced letters. The additional work included field <br />investigations to locate and identify water supply wells, geologic investigations of <br />structural geology and wells and analyses of potential impacts to wells. The findings of <br />these analyses are presented below. <br />Geology and Hydrology of the Ocean Wave Coal Seam and Vermejo Formation <br />The proposed Northfield Coal Mine, located as shown in Figures 1 and 2, will extract <br />coal from the Ocean Wave coal seam, which is a stratigraphic interval within the <br />Vermejo Formation. A description of the local geology and hydrology of the Vermejo <br />Formation, the local structural geology and a stratigraphic column are presented in our <br />May, 2006 hydrology report. Please refer to that report for additional information. <br />The Vermejo Formation consists of interbedded sandstone, shale, mudstone and coal <br />beds. The thickness of the Ocean Wave coal seam ranges from 4 to 6 feet in the mine <br />area based on site specific core and monitoring well data. Lithologic logs from three <br />. monitoring wells completed at the mine site are presented in Figures 3 through 5. The <br />