2018-08-01_HYDROLOGY - M2008017 - Laserfiche WebLink

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Exhibit 3. Operational Losses, Lagged Depletions,and Water Balance Derr Pit Evaporation Losses 4'jiYamsawVied6Coasam.!w 1 I C Table 1 Submitted by: Paul Weiss,P E Total Exposed Water Surface Area' 0.75 acres 5255 Ronald Reagan Boulevard,Suite 220 Johnstown,CO 80534 Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul TOTAL Distribution of Annual Evaporation2 0 135 0 100 0.070 0.040 0 030 0 030 0 035 0.055 0.090 0 120 0 145 0.150 1.000 Net Free Water Surface Evaporation(feet)] 0.394 0.292 0204 0.117 0.088 0 088 0.102 0.160 0.263 0.350 0.423 0.438 2.917 Net Evaporation at Loloff Pit(ac-ft) 0.295 0.219 0.153 0 088 0.066 0.066 0.077 0.120 0.197 0.263 0.317 0 328 2 188 Notes ' See Map 2 for the delineation of the de-watering pond exposed water surface area 2 Distribution of annual evaporation per DWR Guidelines for gravel pits at elevations below 6,500 feet 3 Annual gross evaporation rate of 45 inches taken from NOAA Technical Report N WS 33 Consistent with previously approved Loloff SWSP,a credit of 9.97 inches of effective precipitation results in approximately 35 inches net evaporation Derr Pit Production Losses Vvharna.�aVve"Co-*umrg1 i C Table 2 Submitted by: Paul Weiss,P.E. 5255 Ronald Reagan Boulevard,Suite 220 Johnstown,CO 80534 Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul TOTAL Monthly Production(tons) 25,000 25,000 25,000 25,000 25,000 25,000 25,000 25,000 25,000 25,000 25,000 25,000 300,000 Water Retained in Product(ac-ft)l 0.37 0.37 0.37 037 0.37 0.37 0.37 037 0.37 037 037 0.37 4.41 Water used for Dust Control(ac-ft) 0.60 050 0.40 0.30 0.30 0.20 030 0.40 0.40 0.50 0.50 0.60 500 Total Production Losses(ac-ft) 0.97 0.87 0.77 1 067 1 067 1 0.57 0.67 0.77 0.77 0.87 0 87 0.97 9.41 Notes: ' Material mined below the ground water table,but in a dewatered state. Material has 2%moisture content. W\A W;iter}`e501-11-ce