2018-01-31_PERMIT FILE - C2009087A (3)

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RULE 2-PERMITS The baseline hydrologic information presented in Section 2.04.7, Hydrologic Description, of this permit application includes identification of surface drainages and general flow characteristics; information on corresponding peak flows and annual runoff volumes; identification of groundwater aquifer; and a general description of aquifer characteristics. The baseline hydrologic information forms the basis and serves as a reference for the ongoing hydrologic monitoring program, detailed in Section 2.04.7. The proposed operational monitoring network consists of 8 spoil spring locations, 15 ground water wells (4 overburden, 5 Wadge coal, 3 alluvium, and 3 spoil), and 6 stream locations. The locations of the monitoring stations are shown on Map 2.04.7-M1, Hydrology. Tables 2.04.7-T9 & 2.04.7-T9.1, Ground Water Monitoring Plan Summary, and 2.04.7-T11, Surface Water Monitoring Plan Summary, summarize the type and location of historic and existing monitoring sites. Tables 2.04.7-T10, Ground Water Analytical Parameter List, and 2.04.7-T12, Surface Water Analytical Parameter List, summarize the physical and chemical parameters to be measured. PSCM will continue surface and ground water monitoring activities after completion of reclamation operations to document restoration of pre-mining hydrologic characteristics. All surface and groundwater monitoring installations and associated structures and equipment will be properly installed, maintained, and operated to assure the accuracy and consistency of monitoring data. Surface water monitoring will be discontinued when untreated surface runoff meets applicable effluent limitations and the CDMG approves removal of drainage and sediment control structures. Groundwater monitoring wells will be abandoned and removed in accordance with applicable CDMG guidelines and permit commitments following CDMG approval to discontinue groundwater monitoring. Hydroloeic Protection and Reclamation Plans In order to minimize potential mining-related impacts to existing hydrologic systems in the permit and adjacent areas, PSCM has incorporated specific monitoring, operational, and mitigation measures into the mining and reclamation plans for the PSCM. These measures are based on historic and baseline monitoring information for the site, the experience of other nearby mining operations in controlling hydrologic impacts, applicable regulatory requirements, and the results of ongoing monitoring programs. Historic and baseline monitoring data have been used to characterize current hydrologic conditions including seasonal characteristics as described in Section 2.04.7, Hydrologic Description. During the operation of the mine, monitoring will be performed to determine if any mining-related impacts to the hydrologic balance have occurred and remedial actions taken, if necessary. The hydrologic monitoring plan is described in Section 2.04.7. Measures that may be taken to remediate any mining-related impacts to the hydrologic balance are addressed in the hydrologic protection plan below. As described in Section 2.04.7, Hydrology Description, PSCM researched existing information on the hydrologic environment of the permit and adjacent areas, as well as collecting supplemental hydrologic information in order to accurately characterize existing conditions and develop an overall understanding of hydrologic systems and relationships. The hydrologic protection plans have been developed with consideration of the resource values and relationships described in Section 2.04.7 and PSCM's plans for mining and related activities, as outlined in Sections 2.05.3, Operation Plans, and 2.05.4, Reclamation Plans. The plans, therefore, reflect site-specific conditions and the nature and extent of anticipated mining related impacts in order to assure effective compliance with the following applicable regulatory requirements and consistency with overall environmental objectives: TR09-16 2.05-93 10/25/16