2013-04-10_PERMIT FILE - C1981019A (11)

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RULE 2 PERMITS Detailed Surface Water Resource Information Surface Water Characteristics — The Collom permit expansion area extends from Colowyo's existing western permit boundary along Wilson Creek / Moffat County Road 51, westward to approximately the ridgeline between Collom Gulch and Straight Gulch. The intervening drainage basins of Collom Gulch, Little Collom Gulch, and Jubb Creek will be affected by mining operations. Colowyo's existing mining operations exist primarily in the Taylor Creek, Wilson Creek, and Good Spring Creek drainages to the east, and are described in previous permit documents. The principal drainages within the Collom permit expansion area described below. The descriptions below are modified from WMC's 2005 report to reflect the current mine plan. The full report can be found in Exhibit 7, Item 21. Collom Gulch — Collom Gulch is located along the west edge of the Collom permit expansion area. Above sampling point LCG, it drains approximately 5.05 square miles of hilly terrain. The elevation of the stream channel ranges from 6,457 ft amsl where it crosses Moffat County Road 51 to greater than 7,800 ft amsl near the summit of the Danforth Hills. The stream channel runs north- northeast through the Collom Syncline and then across the pediment slope north of the syncline before joining Morgan Gulch. Collom Gulch is an intermittent stream through out its entire length. The upper and lower reaches of Collom Gulch flow in a relatively narrow valley. The middle reach flows in a flat, wide valley bottom just south of the synclinal axis. There is little sinuosity developed except in the middle reach where the channel is braided. Snowmelt in the upper reach infiltrates into the Collom Gulch valley fill during the spring. In the summer and fall, this recharge probably contributes to stream flow in lower Collom Gulch as groundwater discharge to the stream. Sampling point UCG is immediately adjacent to valley fill well MC- 04 -01. Sampling point LCG is immediately adjacent to valley fill well MC -04 -02 (Map l OB). Little Collom Gulch — Little Collom Gulch is located near the center of the Collom permit expansion area. Above its confluence with Collom Gulch, it drains approximately 2.9 square miles of hilly terrain. The elevation of the stream channel ranges from about 6,520 ft amsl at the confluence with Collom Gulch to approximately 7,800 ft amsl near the summit of the Danforth Hills. The stream channel runs in a northeasterly direction through hilly terrain until it turns to the west and joins the lower reach of Collom Gulch. Little Collom Gulch is an ephemeral stream throughout its entire length. Several small stock ponds have been developed in the lower reach and have contained water on occasion. Much of Little Collom Gulch is located within the proposed Collom Lite pit, Little Collom X pit, and spoil piles. As a result, an upgradient monitoring station was not established. Sampling Point LLCG is located immediately adjacent to valley fill well MLC -04 -01 east and just above the confluence of Little Collom and Collom Gulches (Map IOB). Jubb Creek — Jubb Creek is located on the eastern side of the Collom permit expansion area. Above the USGS gaging station, it drains approximately 7.53 square miles of hilly plateau terrain. The elevation of the stream channel ranges from about 6,400 ft amsl where it crosses Moffat County Road 51 north of the Collom Syncline, to approximately 7,600 ft amsl near the summit of the Danforth Hills. The two forks of Jubb Creek (East and West) join at approximately 6,700 ft amsl (Map l OB). The stream channel runs in a northeasterly direction across the Collom Syncline before joining Wilson Creek several miles northeast of the Trout Creek Sandstone outcrop. Jubb Creek generally has no flow during the winter. Flow in Jubb Creek is partially controlled by several small stockponds located on both the East and West Forks of Jubb Creek. The upper reaches of the West Fork of Jubb Creek lie just east of the footprint of the proposed Collom Lite pit. Two sampling stations established in 1996 (EFJC and WFJC) are located in the east and west Collom — Rule 2, Page 44 Revision Date: 9/28/11 Revision No.: PR -03