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2013-05-09_HYDROLOGY - M2009048
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2013-05-09_HYDROLOGY - M2009048
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Last modified
8/24/2016 5:20:19 PM
Creation date
5/10/2013 10:16:35 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2009048
IBM Index Class Name
HYDROLOGY
Doc Date
5/9/2013
Doc Name
SWSP
From
OSE
To
Grand Junction Pipe & Supply Company
Permit Index Doc Type
Hydrology Report
Email Name
THM
Media Type
D
Archive
No
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Mr. Ivan Geer May 3, 2013 <br />Gunnison River Gravel Pit Nos. 1 & 5 Substitute Water Supply Plan Page 3 of 7 <br />water will be consumed as product moisture on an annual basis at Pit No. 1 (production rate of <br />70,000 tons per year), and approximately 2.80 acre feet of water will be consumed as product <br />moisture on an annual basis at Pit No. 5 (production rate of 250,000 tons per year). <br />The anticipated net depletions for the first year of operation for Pit No. 1 total 3.43 acre -feet, <br />which consists of 1.16 acre -feet of evaporative losses from 1.2 acres of exposed ground water, <br />1.52 acre -feet used for dust suppression, and 0.75 acre -feet for moisture retained in the mined <br />product. The anticipated net depletions for the second year of operation for Pit No. 1 total 5.83 <br />acre -feet, which consists of 3.56 acre -feet of evaporative losses from 2.4 acres of exposed ground <br />water, 1.52 acre -feet used for dust suppression, and 0.75 acre -feet for moisture retained in the <br />mined product. Evaporation amounts are based on the exposure of 0.1 acres of ground water for <br />the mining period of June through August, and the exposure for the non mining months of <br />September through May of 1.2 acres (year 1) and 2.4 acres (year 2). <br />Anticipated net depletions for the first year of operation (water only projected to be used <br />September through December for the first year) for Pit No. 5 total 5.02 acre -feet, which consists of <br />0.16 acre -feet of evaporative losses from 0.2 acres of exposed ground water, 3.74 acre -feet used <br />for dust suppression, and 1.12 acre -feet for moisture retained in the mined product. The <br />anticipated net depletions for the second year of operation for Pit No. 5 total 12.67 acre -feet, which <br />consists of 0.77 acre -feet of evaporative losses from 0.2 acres of exposed ground water, 9.1 acre - <br />feet used for dust suppression, and 2.80 acre -feet for moisture retained in the mined product. <br />Evaporation amounts are based on the exposure of 0.2 acres of ground water for the entire mining <br />period. The monthly distribution of consumptive losses for Pit Nos. 1 & 5 is shown on the attached <br />Tables 2, 3, and 4. <br />The timing of depletions to the Gunnison River from the consumptive uses described in this <br />SWSP was estimated using Glover methodology and the following input parameters: Distance from <br />the centroid of the exposed ground water pond to the river: 283 feet (Pit No. 1) and 303 feet (Pit No. <br />5); distance from the no -flow boundary to the river: 600 feet (Pit Nos. 1 and 5); transmissivity: <br />38,106 gpd /ft. (Pit No. 1) and 40,223 gpd /ft. (Pit No. 5), and specific yield: 0.2 (Pit Nos. 1 and 5). <br />Lagged depletions are shown on the attached Tables 3 and 4. <br />Dewatering will be accomplished by pumping water from each excavation at a maximum <br />rate of 650 gallons per minute (gpm). A portion of the water generated during dewatering will be <br />used to control fugitive dust on site roads and at the crusher facilities. The remainder of the water <br />generated during dewatering will be discharged directly to the Gunnison River adjacent to each pit. <br />Upon completion of operations at Pit No. 1 each year and at Pit No. 5 at the end of its three year <br />mine life, the excavations will be filled by pumping water from the Gunnison River to each <br />excavation at a rate sufficient to replace the volume of water in the first or intermittent fill (up to 850 <br />gpm) within one month. Refilling of the dewatered mine sites is only proposed to occur at times that <br />(1) there are no active calls on the river placed by a senior downstream water user, and based on <br />discussions with the division engineer and water commissioner, there is no anticipation of a <br />downstream call during the refilling period, or (2) sufficient excess replacement water, purchased <br />as proposed in this SWSP, is available to cover potential out -of- priority depletions. <br />REPLACEMENT WATER <br />Replacement water for this SWSP will be provided by releases from Blue Mesa Reservoir. <br />GJPS has obtained a contract with the U.S. Bureau of Reclamation for Blue Mesa Reservoir water <br />
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