2016-02-17_HYDROLOGY - M1996052 - Laserfiche WebLink

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Mr. Rick Parsons, P.E. February 10, 2016 L.G. Everist Combined SWSP Page 2 of 14 **Firestone Pit's projected operations are not currently permitted by the existing permit *** The DRMS permitted boundary for the Fort Lupton Sand and Gravel Pit (M1999-120) was amended to incorporate the Lupton Meadows Pit DRMS M-2002-104 previously included in this SWSP. Projected operations at Fort Lupton Sand and Gravel Pit are not currently permitted by the existing permit ****Star Water Resources (formerly Feit Pit) will be referred in this plan as the Star Water Resources Pit TABLE B - GRAVEL PIT LOCATION Site Name Location Stream Reach Carbon Valley Pit Sections 6, T2N, R67W Saint Vrain Creek Rinn Valley Pit Sections 10, T2N, R68W Saint Vrain Creek Firestone Pit Section 32, T3N, R67W Saint Vrain Creek Fort Lupton Sand and Section 25, 2N, 67W and Section 30, South Platte River Gravel Pit T2N, R66W Star Water Resources Section 26, T6N, R66W Cache La Poudre The liner for the Rinn Valley Phase 3 Reservoir (WDID 0504005) was approved by the State Engineer's Office in December 2010 and the liner of the Everist's Star Water Resource Reservoir (WDID 0303325) was approved by the State Engineer's Office on December 16, 2014 (amended March 6, 2015). A water storage right for Everist's Star Water Resource Reservoir is pending before the water court in case no. 2013CW3168. Additionally, another cell within the former Lupton Meadow Pit site (DRMS M2002-104) identified as Everist Reservoir No. 1 was lined and has storage rights decreed in case no. 2013CW3080. L. G. Everist anticipates to actively mine in 2016 and 2017 the following sites: Carbon Valley Pit, Rinn Valley Pit, Firestone Pit on Saint Vrain Creek and Fort Lupton Sand and Gravel Pit (include cells previously identified as within Fort Lupton Pit and Lupton Meadows Pit) on the South Platte River. Mining at Rinn Valley Pit will cease after August 2016 and mining at Carbon Valley Pit will cease after August 2017, however replacement of lagged depletion associated with these sites will continue to be replaced under this SWSP. Although this SWSP assumes no reduction in the ground water exposed surface area at the Rinn Valley Pit and Carbon Valley Pit, the currently exposed surface areas will be gradually backfilled prior to cessation of the mining operations or will be lined in accordance with the State Engineer's lining criteria. The accounting will indicate the actual measured values during the mining operations. Depletions resulting from dewatering, evaporation and mining operations at these sites are replaced under this plan. Water use at these sites during the period of this plan will include dewatering, evaporation from exposed groundwater, aggregate production, dust control and concrete batching. During the period of this SWSP L. G. Everist will not actively mine Star Water Resources. A December 2014 survey at the site indicated that approximately 2.2 acres are currently exposed beyond the pre-1981 acreage. According to the information provided, a total of 6.1 acres of groundwater was exposed within the Star Water Resources reclamation permit boundary prior to January 1, 1981. Based on the Division 1 Water Court decision in case no. 2009CW49, the replacement of evaporative depletions is not required for ground water exposed to the atmosphere prior to January 1, 1981 through open mining of sand and gravel, regardless of whether open mining operations continued or were reactivated on or after that date. Accordingly, the evaporative depletions for the Star Water Resources were calculated based on an exposed surface area of 1 acre exposed after December 31, 1980. The area receiving the pre-1981 credit is shown on the attached map and is the same area shown in the last SWSP approval for the Star Water Resources (Feit Pit). The area to receive the pre-81 credit is tied to the physical location as depicted in map and cannot be relocated.