2013-05-29_HYDROLOGY - M1999120 - Laserfiche WebLink

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Mr. Rick Parsons, P.E. L.G. Everist Combined SWSP Amendment 1 Page 2 of 9 TABLE A — GRAVEL PIT SUMMARY May 28, 2013 * Applicant must update permits to reflect DRMS Permit amendment integrating M- 2002 -104 into M- 1999 -120. TABLE B — GRAVEL PIT LOCATION Site Name Location Stream Reach Previous Current Well Exposed New Site Name WDID DRMS No SWSP Permit No Surface Permit South Platte River Lupton Meadows Pit Section 30, T2N, R66W Approval acres Re uired? Lohmann Pit 0503003 M- 2001 -017 4/19/2010 70326 -F 4.30 No Rinn Valley Pit 0503004 M- 1997 -093 4/19/2010 75968 -F 6.10 No Firestone Pit 0503005 M- 1996 -052 4/19/2010 69155 -F 7.54 No Fort Lupton Pit 0203040 M- 1999 -120 4/19/2010 65814 -F 4.06 Yes* Lupton Meadows Pit 0203047 M- 2002 -104 4/19/2010 70327 -F 6.34 Yes* * Applicant must update permits to reflect DRMS Permit amendment integrating M- 2002 -104 into M- 1999 -120. TABLE B — GRAVEL PIT LOCATION Site Name Location Stream Reach Lohmann 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 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, the Firestone Pit changed its status with DRMS from "Temporary Cessation" to "Active." Despite the change in status, the Firestone pit will not be mined during this SWSP approval period. L. G. Everist anticipates to actively mine three sites in 2012 and 2013: Lohmann Pit, Rinn Valley Pit, and Lupton Meadows Pit. Depletions resulting from 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. L. G. Everist does not anticipate actively mining the Firestone or Ft. Lupton Pit during the period of the SWSP. Both of these sites expose groundwater and only depletions resulting from evaporation will be replaced under this SWSP. Mining depletions from Lohmann Pit, Rinn Valley Pit and Firestone Pit are estimated to affect the Saint Vrain Creek below the Last Chance Ditch headgate. Mining depletions from the Fort Lupton Pit and the Lupton Meadows Pit are estimated to affect the South Platte River above the Meadow Island Ditch No. 1 headgate. 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 from stored water in the Rinn Valley Phase 3 Reservoir "% VDID 0504005) and, if needed, nontributary Laramie -Fox Hills water withdrawn from well nos. 66271 -F, 66273 -F and 66274 -F. In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado Division of Reclamation, Mining, and Safety ( "DRMS "), all sand and gravel mining operators must comply with the requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the protection of water resources. The April 30, 2010 letter from DRMS requires that you provide information to DRMS to demonstrate you can replace long term injurious stream depletions that result from mining related exposure of ground water. The operator intends to comply with this requirement by providing bonds sufficient to line or backfill the pits in accordance with approaches nos. 1 and 3. One share each of the Rural and Lupton Bottom Ditch has been dedicated to this plan as sufficient bonding is not yet in place. Future SWSPs for this