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