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4/16/2014 State.co.us Executive Branch Mail - Fwd: FW: Wolf Creek Reserve -Response to CDRMS Preli mi nary Comments and Modification of Groundwater Invest... <br />jnettIeton@peabodyenergy.com <br />Based on the Division's preliminary review of the previously provided Groundwater Investigation Work Plan for the <br />Wolf Creek Reserve (WCR), the following items have been identified as needing additional <br />information /clarification, or as appropriate modifications: <br />1) The Division indicated that the proposed groundwater monitoring well location would not be representative , <br />and is requesting that a minimum of one upgradient and one downgradient monitoring well be completed in both <br />the Wadge /Wolf Creek Interburden and the Wolf Creek Coal Seam, in order to adequately characterize the <br />groundwater hydrologic environment <br />2) Relative to well construction, the Division has indicated that well construction should meet the specific <br />requirements of the SEO Water Well Construction Rules (including requirements for grouted steel surface casing) <br />and any well completion activities need to comply with applicable SEO /DWR monitoring well permitting <br />requirements <br />Response /Proposed Plan Modifications: The original Work Plan proposed installation, testing, and ongoing <br />monitoring of a single groundwater monitoring well at location WC007 (renumbered on attached figure as WC005) <br />to establish the hydrologic characteristics of the Wadge /Wolf Creek Interburden. The rationale behind limiting the <br />groundwater hydrologic investigation to a single well included the fact that drilling to date in both the Wadge /Wolf <br />Creek Interburden and the Wolf Creek Coal Seam in the WCR area has not encountered any appreciable ground <br />water in either of these units, and the configuration of the groundwater hydrologic environment, which is <br />essentially a closed basin. <br />https: / /mail.g oog le.conVmai I /u /0 / ?ui =2 &i k= e29129fcb5 &viev�-- pt &search =i nbox&th= 1456bl4cO8d4b9ff &si ml= 1456bl4cO8d4b9ff 6/9 <br />