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"Submit, at a minimum, groundwater quality data collected duringfive (S) successive calendar <br />quarters or as specified by the Division, as may be necessary to adequately characterize baseline <br />conditions. This baseline data shall be sufficient to provide for the proper design of facilities, to serve <br />as a basis for the evaluation of reclamation performance standards, and to ensure the adequacy of <br />Environmental Protection Facility design, maintenance and operation. " <br />Based on the review of this, Denison proposes to change Section 11 of the EPP to state the following: <br />"Monitoring of the two compliance wells on a quarterly basis for the first five quarters of sampling will <br />be completed. At which time, the Division will determine the adequacy of the data and work with <br />Denison to determine if conditions arise necessitating a different sampling frequency or duration. " <br />Based on existing groundwater hydrology in the area, Denison anticipates the flow of groundwater to be very <br />slow and; therefore, does not expect to see noticeable differences in groundwater quality or flow over short <br />periods of time. Denison will work with the Division to determine sampling frequency after the initial five <br />quarters of data have been received. <br />Replacement pages for this section are provided for your review. If you agree, please provide written <br />acceptance of this change. <br />Denison accepts the remaining requirements in your letter as follows: <br />Groundwater Monitoring Plan: <br />• Denison agrees to the location and quantity (two) of monitoring wells to be designated as <br />compliance wells with details of drilling, logging and screening to be submitted later for Division <br />review and decision. <br />• Denison agrees with the compliance levels being set according to "ambient" levels found. <br />• Denison agrees to sample all required analytes as described and referenced in your previous <br />correspondence, and will provide these analytical results to the Division in a timely fashion. <br />• Denison agrees to obtain four additional quarters of data (beyond the number of quarters already <br />required) from the underground well nest and will resume this sampling upon re-opening of the <br />mine following temporary cessation. For safety purposes, the mine has been sealed, and therefore, <br />these wells can presently be accessed for monitoring. Sampling will resume upon active mining as <br />soon as air quality in the vicinity of the well nests is safe for worker entry (as required by the Mine <br />Safety and Health Administration). <br />Ore Pad Liners: <br />• Denison will provide copies of the ore pad liner manufacturer's tests for the liners. <br />• Denison will provide follow-up certification reports, including all aspects of the installation, for <br />each liner installed. <br />• Denison will have a Colorado Registered Professional Engineer oversee the preparation and <br />installation of the liner in accordance with the approved plan. Documentation from this qualified <br />individual regarding installation under proper conditions and performance will be provided to the <br />Division upon completion of liner installation. <br />• Denison will follow and adhere to those aspects of the Environmental Protection Plan (EPP), in <br />form and content of the final iteration. <br />OENISONOII <br />MINES <br />2