2019-06-25_REVISION - M1988108 - Laserfiche WebLink

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Eric C. Scott June 25, 2019 Page 2 of 2 The site is proposed to be dry mined. A ditch around the southern quarry slope and along the gravel/shale interface will intercept seeps and surface water and will direct flows around the slope, along the road, and to the pond. Precipitation falling into the pit will collect in an impoundment sump at the northeast corner of the quarry and be discharged in accordance with the National Pollutant Discharge Elimination System (NPDES) Permit requirements. Final reclamation of the mine will include a permanent pond at the northern end. The water requirements for the processing plant are approximately 30,000 gallons per day which is pumped from the quarry. The pond located at the northern end of the quarry was decreed as Hogan Reservoir (WDID 0604024) in Case No. 81CW074 for irrigation, washing gravel, industrial, and augmentation use. The source of water is natural runoff tributary to Coal Creek. Findings of diligence were entered in Case Nos. 90CW032, 98CW234, 04CW24, 11CW44, and 17CW3137. 150 acre-feet was made absolute for washing gravel and industrial purposes, leaving 54 acre-feet conditional for those uses, and 204 acre-feet conditional for irrigation and augmentation. The priority date for this structure is February 7, 1981. This is a fairly junior water right, which may only impound water when the subject water right is in priority. A call analysis on Hogan Reservoir for the period of June 2009 to June 2019, shows that the reservoir was out of priority approximately 37.41% of the time. Water may also be stored in Hogan Reservoir by administrative exchange as part of an integrated water supply system with Hogan Ditch No. 2, Hogan Reservoir No. 2, and Hogan Well No. 2. At all other times, all inflow of water into the reservoir from any source, including seepage and precipitation, must be released to the stream system. The applicant proposes to construct a monitoring well down-gradient of the pit to verify that leachate from the waste material has not impacted local groundwater conditions. A Notice of Intent to construct a monitoring hole must be filed with this office at least 72 hours prior to construction of a monitoring hole (which may be converted to a monitoring well after completion), or a monitoring well permit must be obtained prior to construction of a monitoring well. The Division of Reclamation, Mining and Safety and/or the Applicant may contact the State Engineer's Office with any questions.