2013-04-10_GENERAL DOCUMENTS - C1981019

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12. Tables 2.04.7 -30 to 36, Volume 12, also present surface water information for the South Taylor and Lower Wilson areas as do Figures 2.04.7 -22 to 32 (Volume 12). Map l0A and Map 11A in Volume 14 provide monitoring and other hydrologic feature locations for the South Taylor and Lower Wilson areas. The permit area is drained by four perennial streams: Goodspring Creek on the east, Wilson Creek, Jubb Creek and Collom Gulch. Taylor Creek, an intermittent stream generally parallel to Wilson Creek, flows into Wilson Creek north of the rail loadout. Several ephemeral drainages occur on the permit area, including the Streeter Drainage. This drainage profile was raised as a result of an excess spoil fill in the Streeter Canyon known as Streeter Fill, near the confluence of Streeter Drainage and Goodspring Creek. These drainages are tributaries to Milk Creek, which flows into the Yampa River about seven miles north of the permit area. Precipitation averages 18 inches annually on the property and runoff is limited. Flows in the drainages are mainly in response to snow melt or intense thunderstorm events. Water sampled from the drainages is quite hard, dominated by calcium and magnesium cations and bicarbonate and sulfate anions. The relatively high alkalinity and pH of the system impede the solubility and transport of heavy cations, thus minimizing potential toxicity problems associated with heavy metals or acid drainage. Springs and seeps are abundant in the area, with 59 originally identified during an inventory completed in 1985. More recent inventory and study resulted in additional springs and seeps in the South Taylor and Lower Wilson areas. Four springs were found to be perennial, two tributary to Wilson Creek and two tributary to Good Spring Creek. The locations of all monitored springs and seeps are shown on Map 10A, Volume 14. Spring and seep information is included in Tables 2.05.6 -1 and 2 in Volume 12 for the South Taylor and Lower Wilson areas. The Collom expansion area includes the perennial streams of Collom Gulch and Jubb Creek and their tributaries, Little Collom Gulch and the East and West Forks of Jubb Creek, which are ephemeral or intermittent drainages. All of these streams generally flow from south to north. Collom Gulch and Jubb Creek are, respectively, tributaries to Morgan Gulch and Milk Creek, which are tributaries to the Yampa River. Previous studies by Tetra Tech and by Cedar Creek Associates have identified 33 seeps and springs within the Collom Gulch, Little Collom Gulch, and Jubb Creek drainages. Ponds shall be designed, constructed, and maintained to treat the volume from a 10 -year, 24 -hour precipitation event. Discharges from ponds will be monitored to detect exceedances of limitations listed in the CDPS permit. In addition to the use of sediment ponds, the Division proposes to grant small area exemptions for some locations on the Collom site. These include four small areas outside of the sediment control system of ditches and ponds. These areas are described in the PR -03 application (Exhibit 7, Item 23, Part H). The proposed small area exemptions at the Collom facilities area drain areas larger than the Division usually considers appropriate. As a result, the Division is adding Colowyo Coal Mine C1981 -019 PR -03 25 April 10, 2013