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Cheryl Signs, P.E. April 12, 2011 <br />Seahorse Ranch West Pit and Vader Pit Combined Replacement Plan Page 2 of 7 <br />Depletions <br />The depletions resulting from evaporation, water lost in product, dust control and concrete <br />production are shown in Table 3 below: <br />TABLE 3 - DEPLETIONS <br /> <br />Site Name Evaporation <br />Loss Product Moisture Loss Dust Control Concrete Total Depletions <br /> ( (ac-ft) (ac-ft) Production (ac- (ac ft) <br /> ft) <br />Seahorse <br />Ranch <br />West 81.50 3.18 <br />(108,545 tons) <br />0.67 <br />0.27 <br />87.30 <br />Gravel Pit <br />Vader Pit 58.23 0.0 0.0 0.0 58.23 <br />Total 139.73 3.18 0.67 0.27* 143.58** <br /> <br />Water for concrete batchmg will be obtained from an existing well, permit no. 27134-FR, decreed in case no. <br />79CW241. <br />"The total depletions for the two sites do not include the water used for concrete batching since water for <br />concrete batching will be used from well permit no. 27134-FR. <br />As mentioned above, water for concrete batching will be obtained from an existing well, permit <br />no. 27134-FR, decreed in case no. 79CW241. Well permit no. 27134-FR was issued on November 7, <br />2007 for the replacement of the original well no. 27134-F. The use of ground water from this well is <br />restricted to the irrigation of not more than one (1) acre on Lot 6, Signal Peak Industrial Park Filing <br />No. 1, at a rate of 10 gallons per minute during the irrigation season, and year-round use for industrial <br />purposes at a rate of 5 gallons per minute. The average annual amount of ground water to be <br />withdrawn from this well. is limited to 2 acre-feet. <br />Computation of evaporation under this SWSP was reduced during the ice covered periods. <br />You have assumed the ice covered period to occur during the months of November, December, <br />January, February and March, based on average monthly temperatures less than 32°F taken from <br />the Gunnison 1 N weather station. However, for the purpose of this SWSP, the Applicant shall <br />replace the net evaporation depletions from the exposed ground water surface area that may occur <br />during the assumed ice covered period (the months of November, December, January, February and <br />March) for any time that the pits are not completely covered by ice. <br />Computation of the net evaporation during any time that the pit is not completely covered by <br />ice shall be determined as the pro-rata amount of the monthly gross evaporation rate distribution <br />amount identified in the State Engineer's General Guidelines for Substitute Supply Plans for Sand <br />and Gravel Pits, subtracting the pro-rata amount of the effective precipitation for that period. <br />The Seahorse Ranch West Pit and Vader Pit are located within 100 feet of Tomichi Creek, <br />therefore the timing of the stream depletions was assumed to be instantaneous.