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PERMFILE137694
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PERMFILE137694
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Entry Properties
Last modified
8/24/2016 10:38:19 PM
Creation date
11/26/2007 6:24:28 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Permit File
Doc Date
7/15/2002
Doc Name
Environmental Assessment, Panels 16-24
Section_Exhibit Name
Exhibit 80 Drilling Activities - TR96
Media Type
D
Archive
No
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CaalMethane Drainage Project - Pane6 76-74 Wut E!k Minr • Page 3-4 <br />great as the shallow ground water springs. Water from springs is generally more saline than the <br />surface water in the area. <br />There are approximately 37 stock ponds within the mine permit area, of which the majority are in the <br />project area. The stock ponds aze generally located in drainages, and pond water levels are monitored <br />annually. Two adjacent ponds, located in Section 27 in the upper reach of the Sylvester Gulch <br />drainage and referred to as the Two Ponds Sensitive Area, cover a total area of 2 to 3 acres and <br />include an aquatic ecosystem, riparian areas, wetlands, and habitat for cavity-nesting birds (Greystone, <br />Oct. 2001 a). A seep was also mapped approximately 4,400 feet downstream from the two ponds. A <br />0.1 acre seep/pond, located on section 15 and 22 boundary in the southwest comer of Panel 21, was <br />identified as potentially providing habitat fox sensitive species (Gzeystone, Oct. 2001b}. <br />MCC maintains monitoring stations and regularly monitors flows and water quality on Minnesota <br />Creek, Dry Fork, the North Fork, Horse Gulch, Deep Creek, and Sylvester Gulch. Flow <br />measurements and field parameters are typically collected three times per year (spring, summer, and <br />fall) and water quality sampling and analysis occurs annually. Commitments for future monitoring aze <br />tied to initiation of active mitring within a watershed azea, with initial monitoring at least one year in <br />advance of mining disturbance. In compliance with the terms of their approved CDMG nvning <br />permit, MCC will continue monitor surface water flows and quality for all potentially affected surface <br />drainages that overlie active mining areas. <br />3.1.1.4 Ground Water <br />Shallow Quaternary alluvial and colluvial deposits above bedrock are the principal ground water <br />bearing units in the azea, particulazly along the North Fork and larger tributaries. colluvial andjor <br />alluvial deposits generally line area drainage bottoms but are limited in extent both laterally and in <br />thickness. Typical depths aze less than 100 feet. Thickness of the alluvialfcolluvial materials varies <br />with stream gradient. They are typically thinner in the smaller, steeper upper stream reaches and <br />thicker as gradient decreases in the middle and lower reaches of area drainages. These deposits are <br />typically stratified, with upper zones that aze recharged from streamflows under high flow conditions <br />and direct infiltration of mnoff from preupitation and snowmelt. Under low flow conditions, the <br />saturated alluvial/colluvial deposits may release water to azea streams, effectively extending <br />streamflows. Given the semi-arid conditions in the area and relatively steep stream gradients, many <br />of the smaller drainages do not receive enough water to maintain long-term flows or to saturate the <br />alluvial/colluvial deposits. <br />Most springs and seeps issue from colluvial deposits underlain by less permeable bedrock. Some have ' <br />been developed for livestock watering and to support wildlife. Surface materials and associated <br />shallow groundwater and seeps have the Following general chazacteristics: <br />• Flows change dramatically through the year, with high flows following spring snow melt <br />• Alluvial sediments may have significant water transmission capacity <br />• Alluvial sediments often have limited storage volume relative to recharge and discharge rates <br />• Sediments are often hydrologically connected with surface water flows <br /> <br />The alluvial/colluvial water-bearing zones may be hydrauhcally connected with adjacent bedrock and I <br />interrnixing of waters may occur. 1n addition, changes in surface water expression may either cause <br />or result from landslide events. I <br />The North Fork alluvial aquifer is the source of drinking water for the town of Paonia. The alluvial ' <br />ground water is typically a catcium-bicazbonate type water with good quality and moderate hazdness, ~ <br />19.VP/N.n/a~GlG/FBI/Onp 1/a/0)t~ UfFt <br />i/1/Old <br />Envisunmental A/aerrment <br />I <br />
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