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RECEIVED <br />DATE: July 16, 2008 JUL 2 1 2008 <br />Division of Reclamation, <br />/O: Travis Marshall Mining and Safety <br />/FROM: Kate Pickford <br />'RECEIVED <br />JUL 16 2008 " ili GRAND J NGI IU N OF D OFFICE <br />DIVISIO <br />RECLAMATION MINING & SAFETY <br />RE: Second Hydrology Review of Lyster Oil Company, Inc., Lyster Pit, File No. M- <br />/2008-009 Moffat County <br />The Division has reviewed the responses to the second hydrologic adequacy comments for the <br />Lyster Oil Company, Inc. 112c permit application for the Lyster Pit, File #M-2008-009, and <br />submits the following comments. <br />The Division agrees that the locations of the proposed monitoring wells should be adequate to <br />protect the interests of the adjacent wells of unknown depth. The Division will also agree to the <br />abbreviated sampling schedule with regard to groundwater levels. The Applicant should be <br />aware, however, that this shorter sampling time for establishing baseline could be artificially <br />high, with regard to the lowest annual seasonal fluctuation, and may result in the implementation <br />of mitigation measures when they may be unwarranted. <br />The Division still requires a monitoring plan, trigger points for mitigation, and proposed <br />mitigation measures to be incorporated should the trigger point be reached. The monitoring plan <br />should indicate the frequency of collection of water level measurements. The trigger points <br />should be a designated amount of drop in the monitoring well or wells which will signal the <br />application of mitigation measures. The proposed mitigation measures should address what steps <br />will be taken in the event the trigger point is reached. <br />Additionally, during previous conversations, it was stated that some portions of the adjacent <br />pastures may require additional surface irrigation as a result of dewatering at the site. The <br />Applicant should submit mitigation measures to be taken in the event that the adjacent pastures <br />are impacted by dewatering activities at the site.