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2023-01-10_PERMIT FILE - M2023001 (12)
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2023-01-10_PERMIT FILE - M2023001 (12)
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Last modified
1/11/2023 9:26:39 PM
Creation date
1/11/2023 3:10:11 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2023001
IBM Index Class Name
Permit File
Doc Date
1/10/2023
Doc Name Note
Exhibit G - Water Information
Doc Name
Application
From
J-2 Contracting Company
To
DRMS
Email Name
PSH
JLE
Media Type
D
Archive
No
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EXHIBIT G <br /> Water Information <br /> Introduction <br /> The Sunset Industrial Pit mining site is located in the E 1/2 of NW 1/4, the NE 1/4 of the SW <br /> 1/4, the E 1/2 of the SW 1/4 of the NW 1/4, and the E 1/2 of the NW 1/4 of the SW 1/4 of <br /> Section 3, Township 5 North, Range 65 West of the 6th Principal Meridian, County of Weld, <br /> State of Colorado and that part of the SE 1/4 of the SW 1/4 and the E 1/2 of the SW 1/4 of the <br /> SW 1/4 of Section 3, Township 5 North, Range 65 West of the 6th Principal Meridian, County of <br /> Weld, State of Colorado lying North of the Eighth Street Road except that portion described in <br /> deed recorded September 24, 1982, at reception no. 1904628, Weld County, Colorado. The <br /> proposed mining site is adjacent to the City of Greeley city limits, and adjacent to 8th Street. The <br /> Cache La Poudre River is approximately 700 feet south of the site on the south side of the <br /> permit boundary. 8th Street is immediately adjacent to the west side of the permit boundary. <br /> Access to the site will be located at the southwest corner of the permit boundary off of 8th Street. <br /> The operation will consist of sand and gravel production and will impact the Cache La Poudre <br /> River in the form of depletions due to evaporation and operational losses associated with <br /> mining. Mining of the Sunset Industrial Pit mining site will last for approximately 12 years. Once <br /> reclamation is complete reservoirs will be created with a total surface area of Reservoir 1 being <br /> 41.89 acres and Reservoir 2 11.71 acres. <br /> The depth to groundwater ranges from 18 to 40 feet within the permit boundary (measured in <br /> MW-1 through MW-5, See the attached piezometer measurements table). The site will be mined <br /> down to a depth of 40 to 112 feet thus exposing groundwater to the atmosphere. This exposed <br /> groundwater, along with the operational losses associated with the extraction of sand and gravel <br /> deposits, will impact the Cache La Poudre alluvial aquifer. These impacts will cause river <br /> depletions that must be augmented. Groundwater will be exposed during the mining once the <br /> mining depths reach an elevation of approximately 4614. <br /> To enable dry mining at the Sunset Industrial Pit mining site, there will be dewatering trenches <br /> around the various phases of the site. These dewatering trenches will change in length <br /> throughout mining. The maximum length will occur when one phase is completely mined, but <br /> before the reclamation has begun on any given phase. The maximum size of dewatering trench <br /> will be 3,000 feet long and 5 feet wide, or 0.33 acres of exposed surface area. This water will be <br /> collected in a recharge pond totaling 3.5 acres. The water will be pumped into dewatering ditch, <br /> which traverses the site, into a recharge pond and ultimately into the Cache La Poudre River. <br /> As mining progresses, the dewatering trenches will shift as various cells are reclaimed. The <br /> gravel pit will have a slurry wall liner being constructed as mining commences in Phase 1. <br /> Water Requirements <br /> Water use at the Sunset Industrial Pit mining site will include evaporation from exposed <br /> groundwater, dust control of haul roads and stockpiles, and water retained in material removed <br /> from the site. <br /> J-2 Contracting Company <br /> JET Consulting,Inc. <br /> �' Sunset Industrial Pit <br /> DRMS 112 Permit Application <br />
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