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RULE 4 PERFORMANCE STANDARDS <br />4.05.10 Underground Mine Entry and Access Discharges <br />Colowyo currently conducts surface coal mining exclusively. <br />4.05.11 Groundwater Protection <br />There are no aquifers or continuous sources of groundwater within the stratigraphic section from which the <br />Colowyo Mine mines coal using surface mining techniques. This is also noted in Section 2.04.7. In addition, <br />there are no continuous aquifers of regional extent within the entire Williams Fork Formation in the location <br />of the Colowyo Mine. Occasionally, a minimal amount of water is found under perched conditions in <br />noncontiguous lenticular sandstones and in fractured coal under the sandstones. No toxic concentrations of <br />acid - forming materials have been found in the overburden, reclaimed slopes or surface and groundwater <br />system associated with the Colowyo Mine. <br />4.05.12 Protection of Groundwater Recharge Capacity <br />The reclamation plan as described in 2.05.4 will return the disturbed lands to approximately the pre- mining <br />condition; therefore, ground water recharge capacity is expected to approximate the pre- mining condition. <br />Also, because of the minimal existence of ground water in the mining area, the mining operation and <br />subsequent reclamation should have no adverse effect on the existing ground water recharge capacities. <br />4.05.13 Surface and Groundwater Monitoring <br />The proposed monitoring program will replace the existing monitoring program in its entirety. This section <br />replaces Section 4.05.13 of Volume 1. Colowyo proposes monitoring the following sites: <br />Sedimentation Ponds - The proposed surface water monitoring plan includes monitoring required under <br />the NPDES Permit Number CO- 0045161 issued by the Colorado Department of Public Health and <br />Environment. Colowyo will measure the quantity and quality of any discharges from the permit area in <br />compliance with the NPDES Permit in accordance with permit requirements. Please refer to Colowyo's <br />discharge permit for a list of monitored parameters. <br />Colowyo will report the discharge in accordance with the Clean Water Act of 1977 under the NPDES <br />Permit on a quarterly basis; therefore, Colowyo will plan to use the NPDES report for filing with the <br />Division. All surface water and shallow ground water monitoring data is submitted in an annual report. <br />Annual Hydrologic Reports for the period of January 1St through December 31" will be submitted by <br />April I" of the following year. <br />At various times, due to unforeseen circumstances, Colowyo will obtain and discharge water under a <br />CDPS minimal discharge permit. In the event that water is discharged under a minimal discharge permit, <br />Colowyo will report the discharge in the corresponding Annual Hydrologic Report. <br />Surface Water - Six surface water sites will be monitored to some degree. These points include five locations <br />along Good Spring Creek and one location along Taylor Creek. <br />Monitoring Monitoring Monitoring Ouarterly Field Ouarterly Laboratory <br />Type Location Frequency Parameters Parameters <br />Surface <br />Water <br />Lower Taylor <br />Creek (LTC)' <br />Quarterly <br />Flow from Parshall <br />Flume. See List Below <br />Flow from Parshall Flume. <br />See List Below <br />Surface <br />Lower West <br />Quarterly <br />Flow Only taken from <br />Flow Only taken from <br />South Taylor /Lower Wilson — Rule 4, Page 10 Revision Date: 10/31/13 <br />Revision No.: MR -129 <br />