2014-02-28_HYDROLOGY - M1977522 - Laserfiche WebLink

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Mr. Rick Parsons, P.E. L.G. Everist Combined SWSP Page 2 of 10 February 27, 2014 * * ** *The Applicant purchased the Feit Pit DRMS M- 1977 -522 in October 2013 (now called the Star Water Resources) and requested to include this pit in this combined SWSP. 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 Pit Section 30, T2N, R66W South Platte River Lupton Meadows Pit Section 30, T2N, R66W South Platte River Star Water Resources Section 26, T6N, R66W Cache La Poudre During the past SWSP approval period (2010 — 2011) the liner for the Rinn Valley Phase 3 Reservoir (WDID 0504005) was approved by the State Engineer's Office in December 2010. Additionally, two cells within the former Lupton Meadow Pit site (DRMS M2002 -104) identified as the Meadow West Reservoir and Everist Reservoir No. 1 were lined and have storage rights pending in case no. 2007CW25. Also, the Firestone Pit changed its status with DRMS from "Temporary Cessation" to "Active." L. G. Everist anticipates to actively mine in 2014 and 2015 the following sites: Carbon Valley Pit, Rinn Valley Pit, Firestone Pit on Saint Vrain Creek and Fort Lupton Sand and Gravel (include cells previously identified as within Fort Lupton Pit and Lupton Meadows Pit) on the South Platte River. 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 but will dewater the site to facilitate the installation of an operational platform to support a slurry wall liner installation. Dewatering is anticipated to continue until approximately one acre of surface water area is exposed at the site. 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 (Felt Pit). The area to receive the pre -81 credit is tied to the physical location as depicted in map and cannot be relocated. Mining depletions from Carbon Valley Pit, Rinn Valley Pit and Firestone Pit are estimated to affect the Saint Vrain Creek below the Last Chance Ditch headgate. Mining depletions from Fort Lupton Sand and Gravel are estimated to affect the South Platte River above the Meadow Island Ditch No. 1 headgate. Mining depletions from Star Water Resources are estimated to affect the Cache La Poudre River at a point approximately eight miles upstream from the confluence with the South Platte River. The proposed replacement sources for these pits are Rural Ditch Company shares and Lupton Bottom Ditch shares during the summer months. During the winter months and for portions of the summer months the depletions will be replaced by releases of water stored in the Rinn Valley Phase 3 Reservoir (WDID 0504005), Meadow West Reservoir (aka Everist No. 2/4 Cell) (WDID 0203932) and, if needed, nontributary Laramie -Fox Hills water withdrawn from well nos. 66271 -F, 66273 -F and 66274 -F.