2021-02-03_REVISION - M2020008 (4)

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Rifle Gravel Pit #1 January 2021 (Amendment to File No M-2020-008) Table 2. Water Use Demands for Active Minin Exposed Amount of Water Lost Water Used Groundwater Domestic/ Total Aggregate With Mined for Dust Evaporation Commercial Operational Water Use Production Aggregate Control Indoor Use Volume(AF) Avg Rate Month tons AF AF AF AF m Jan 16,667 0.491 3.07 0.00 0.00 3.56 26.0 Feb 16,667 0.491 3.07 0.00 0.00 3.56 28.8 Mar 16,667 0.491 3.07 0.00 0.00 3.56 26.0 Apr 16,667 0.491 3.07 0.00 0.00 3.56 26.9 May 16,667 0.491 3.07 0.00 0.00 3.56 26.0 Jun 16,667 0.491 3.07 0.00 0.00 3.56 26.9 Jul 16,667 0.491 3.07 0.00 0.00 3.56 26.0 Aug 16,667 0.491 3.07 0.00 0.00 3.56 26.0 Sep 16,667 0.491 3.07 0.00 0.00 3.56 26.9 Oct 16,667 0.491 3.07 0.00 0.00 3.56 26.0 Nov 16,667 0.491 3.07 0.00 0.00 3.56 26.9 Dec 16,667 0.491 3.07 0.00 0.00 3.56 1 26.0 Total 200,000 5.89 36.83 0.00 0.00 42.72 Table 3.Water Use Demands for Post Mining Gross Evaporation -Post Mining For Finished Pond Surface Area: Gross Unit Evaporation 53 acres Month /Per 1 Acre AF Volume AF Average Rate m Jan 0.11 - Feb 0.13 - Mar 0.21 10.93 79.8 Apr 0.34 17.89 134.9 May 0.45 23.85 174.1 Jun 0.54 28.82 217.4 Jul 0.56 29.81 217.6 Aug 0.51 26.83 195.8 Sep 0.38 19.88 149.9 Oct 0.26 13.91 101.5 Nov 0.15 7.95 60.0 Dec 0.11 - Total 3.76 179.87 8.7 Colorado Discharge Permitting System (CDPS) Permit and Army Corps of Engineers (ACOE) Permitting SCI will have an approved CDPS permit from the CDPHE-WQCD and ACOE prior to any discharge. 33