2018-02-05_REVISION - C1992081 (29)

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The TAHR was designed and constructed during 1989 in preparation for coal haulage in 1990 from the Seneca II -W Mine area to the Hayden Station Power Plant. The TAHR was originally approved as part of the Seneca II -W Permit No. C-1982-057 and was transferred to HGT as a part of PRI. The TAHR begins at the junction of the former location of HGLF-HR1 haul road (station 25+90) located at the original entrance gate and proceeds approximately 4.1 miles easterly to the intersection with Routt County Road 51 B on the coal haul road entrance to the Hayden Station. The acreage of the TAHR is separate from the backfill and grading schedule and reclamation schedule. The road is currently approved to remain in place until year 2030. II. Support Facilities - Rule 4.04 Information on mine support facilities is found in Volume 2, Tab 12 of the PAP. A summary is found in the Summary Section of this document under "Description of Operations and Reclamation Plan." Specific findings for Rule 4.04 are not applicable. III. Hydrologic Balance - Rule 4.05 Volume 3, Tabs 13, 14 and 15 of the HGT PAP includes a hydrologic monitoring program, a description of protection of the hydrologic balance and an assessment of the probable hydrologic consequences of the proposed operation. Each year, HGT assesses the ongoing impacts to the hydrologic system in its annual hydrologic report. The probable hydrologic consequences as set forth in Volume 3, Tab 15 are summarized below. The small area exemption sites are listed in Volume 12, Tab 12 of the PAP. A. Water Quality Standards and Effluent Limitations Receiving stream standards for the Yampa River and its tributaries have been set by the Colorado Department of Health in their publication, "Classification and Numeric Standards for Upper Colorado River Basin and North Platte River (Planning Region)". Dry Creek is within segment 12 of the Upper Colorado River sub -basin and basin. Colorado Department of Health NPDES (National Pollution and Discharge and Elimination System) limitations on discharge and the Division's standards for determining material damage to the hydrologic balance ("Division Procedures for the Assessment of Material Damage with Respect to Alluvial Valley Floors, the Cumulative Hydrologic Impact Assessment and Subsidence at Coal Mines") are based in part on these standards. 1. Most disturbed area drainage passes through one of two existing sediment ponds (a small amount of disturbed area drainage passes through SAE's, described in # 2 below). Discharges from these ponds are monitored to verify compliance with water quality standards and effluent limitations (4.05.2(2)). 09.