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2018-11-19_PERMIT FILE - C2010089A (6)
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2018-11-19_PERMIT FILE - C2010089A (6)
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Last modified
11/14/2019 7:47:19 AM
Creation date
12/12/2018 8:44:18 AM
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Template:
DRMS Permit Index
Permit No
C2010089A
IBM Index Class Name
PERMIT FILE
Doc Date
11/19/2018
Doc Name
Protection of Hydrologic Balance
Section_Exhibit Name
Section 2.05.6(3)
Media Type
D
Archive
Yes
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the overburden at GW -N9 (see New Horizon 1 Area Permit) of 2.1 ft/day. The old Peabody <br />Nucla Mine site (New Horizon 1 Area) has experienced continued seasonal irrigation and runoff <br />return flow infiltration from the 2nd Park Lateral since the final reclamation (ls` Qrt. 1992). Water <br />infiltrating from this irrigation and precipitation have percolated and moved through the bedrock <br />zones and then drained into and through the backfill and saturated it until water discharges at the <br />low point of the base of the coal which is at Spoil Spring #1, (see Map 2.04.7-1 for location). <br />Flow from this spring fluctuates in response to the use of irrigation from a low of about 17 gpm <br />to a high of about 52 gpm with an average annual flow of around 27gpm (or about 44 acre-ft/yr). <br />This flow represents the bedrock zones discharging and draining through the backfill. The NHN <br />Mine will be analogous to the old Nucla Mine with the exception that unlike the "old" mine (not <br />irrigated) portions of NHN Mine backfill will be irrigated. Irrigation of the surface could begin <br />as early as Spring 2015. Once irrigation resumes, surface irrigation water will infiltrate into the <br />backfill and then drain toward the southwest along the floor of coal and issue as a spring in the <br />same vicinity as existing Spring #1. As a matter of clarification, the HDPE pipeline will be <br />moved to the approximate location of the 2nd Park Lateral after mining, backfilling and <br />replacement of top soil has progressed far enough north. This is expected to require about 3 to 4 <br />years after mining begins. The HDPE pipeline will be retained to prevent the irrigation water <br />from draining into the very permeable pit backfill. This will also prevent the direct loss of <br />irrigation water along the course (sides and bottom) of 2nd Park Lateral ditch as occurs now. The <br />HDPE pipeline will allow for sprinkler irrigation which is much more efficient method of <br />irrigating than is flood irrigation and will further help limit the loss of water to the backfill by <br />infiltration. <br />The amount of irrigation water that will drain through the backfill is estimated by first <br />considering how much water will be used for irrigation. The Garvey parcel (about 37 acres) <br />north of the 2nd Park Lateral will be irrigated with 27 shares of CCC ditch water, (see Map <br />2.04.10-1). The Meehan parcel (about 38 acres) may be irrigated with about 20 shares of CCC <br />ditch water. Each share equates to 0.0308 cfs or about 10.08 acre -ft over the 165 day irrigation <br />season. The Garvey parcel will therefore receive about 272 acre-ft/yr or about 7.15 ac-ft/acre/yr <br />of water while the Meehan parcel receives about 202 ac-ft/acre/yr or about 5.3 ft/acre of water. <br />Section 2.04.10, Vegetation, describes the Meehan "irrigated pasture" and the Garvey "intensely <br />managed irrigated pasture". Not all of this irrigation water will infiltrate the backfill as some <br />water will run off toward Meehan Draw as irrigation return water, some water will be lost to the <br />atmosphere through evaporation, and some water will be lost through plant -take up and <br />evapotranspiration. <br />Flow gain in Meehan Draw through the irrigation water return is about 213 acre -ft /yr which is <br />over 30 percent of the water used for irrigation. The annual evaporation rate is approximately 60 <br />inches per year (NOAA-National Weather Service, Montrose No. 1 Evaporation Station) of <br />which the majority occurs during the warmer drier months that coincide with the irrigation <br />Section 2.05.6(3) Page 16 March 2018 (TR -16) <br />
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