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Mr. Raul Passerini, P.E. <br />June 24, 2015 <br />Long Term Augmentation <br />Page 2 <br />Everist estimates that a total of three unlined ponds will remain after cessation of <br />mining within Cell Nos. 2, 3 and 4. The total surface area of exposed ground water <br />corresponding to these three ponds is estimated to be 35.1 acres. In addition, Everist long- <br />term operation plans (after gravel mining ceases) include production for Colorado Department <br />of Transportation ("CDOT") of asphalt and concrete batching. The annual long-term <br />depletions due to ground water evaporation, and losses associated with concrete and CDOT <br />asphalt production are estimated to be 73.3 acre-feet. <br />In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado <br />Division of Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators <br />must comply with the requirements of the Colorado Reclamation Act and the Mineral Rules <br />and Regulations for the protection of water resources. The April 30, 2010 letter from DRMS <br />requires that you provide information to DRMS to demonstrate you can replace long term <br />injurious stream depletions that result from mining related exposure of ground water. The <br />DRMS letter identifies four approaches to satisfy this requirement. The 4th approach requires <br />documentation to identify what water rights or other permanent water source will be <br />dedicated to the SWSP to assure that all permanent depletions from either an unforeseen <br />abandonment of the site by the Applicant or as a result of long term ground water exposure <br />after completion of mining and reclamation will be replaced so as to prevent injury to other <br />water rights <br />In accordance with approach no. 4, Everist provided an affidavit dated January 29, <br />2015, that dedicates the Applicant's interest in Famine Creek Ditch, the Old Whetstone Sheep <br />Creek Ditch, the South Rock Creek Ditch, and the McKay Ditch, as replacement water solely for <br />the Maryland Creek Ranch site (M-1996-049) for as long as there are depletions at this gravel <br />pit site or until such time as other replacement sources are obtained. A copy of the affidavit <br />is attached to this letter. In addition, the affidavit indicates that Everist has entered into a <br />contract with the U.S. Bureau of Reclamation for the right to obtain the annual release of 84 <br />acre-feet of water from Green Mountain Reservoir. Of this total 20.8 acre-feet are needed for <br />replacement of the long-term stream depletions. For the purposes of this SWSP, this affidavit <br />will be accepted for the dedication of the above water right and water from Green Mountain <br />Reservoir; however, if the State Engineer determines that a different affidavit or dedication <br />process is necessary to assure proper dedication of the shares, additional information may be <br />required prior to future SWSP approvals. <br />Consumptive Use <br />The anticipated net depletions for this plan include evaporation of exposed ground <br />water, water lost in product, "first fill" water, water used for a crusher and wash plant, water <br />used for dust control, truck and vehicle washing, asphalt production, concrete batch plant <br />operations, drinking and sanitary use in an office, and water used for approximately 1 acre of <br />landscape irrigation. You have provided a monthly breakdown of the annual depletions made up <br />of 91.4 acre-feet for 2015 and 93.28 acre-feet for 2016. The evaporation and operational losses <br />associated with the Maryland Creek Ranch site are summarized below: <br />Evaporation <br />Net evaporative depletions were calculated using a gross annual evaporation amount <br />of 33.5 inches from the exposed water surface, an annual precipitation amount of 16.1 inches <br />(using the Dillon 1 E and Green Mountain Dam weather stations), and an effective precipitation <br />