2014-08-12_HYDROLOGY - M1978056 - Laserfiche WebLink

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Cheryl Signs, P.E. Page 10 Durham Combined SWSP August 12, 2014 HCU Results for G c1ding Ditch cl ear Month Jan Feb Mar Apr May Jun Jul AugSep Oct Nov Dec Total Farm Headgate Delivery 0 0 0 0 39.85 74.65 39.72 12.89 6.24 4.58 0.0 0.0 177.93 On Farm Depletion of Surface Water 0 0 0 0.23 7.67 32.53 56.63 39.10 4.70 2.37 0.0 0.0 143.23 Surface Return Flow 0 0 0 0 4.00 1 7.47 3.97 1.27 0.63 0.47 0 0 17.80 Ground Water Return Flows 0 0 1 0 0 11.00 23.93 1 5.97 1.93 0.93 0.70 0.0 1 0.0 44.47 Lagged Ground Water Return Flows 3.92 3.79 3.64 3.49 3.33 3.22 3.29 3.63 3.94 4.08 4.10 4.03 44.46 Average Net Depletion -3.9 -3.8 -3.6 -3.5 32.5 64.0 32.5 8.0 1.7 0.03 -4.1 -4.0 133.5 Return Flow Factor 2.2% 2.1% 1 2.0% 1 2.0% 8% 1 4% 8% 28% 63% 89% 2.3% 2.3% NA Return Flow amounts exceeded farm delivery by 22.97 acre-feet The HCU analysis for both the Last Chance Ditch and the Godding Ditch is accepted for the purpose of this SWSP. However, for any renewal request of this combined SWSP the applicant must justified the irrigation efficiency and the HCU quantification for all changed shares. Long Term Augmentation 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 DRMS letter identifies four approaches to satisfy this requirement. The 4th approach requires documentation to identify what water rights or other permanent water source will be dedicated to the SWSP to assure that all permanent depletions from either an unforeseen abandonment of the site by the Applicant or as a result of long term ground water exposure after completion of mining and reclamation will be replaced so as to prevent injury to other water rights In accordance with approach no. 4, you have provided an affidavit dated November 1, 2010 that dedicates the Applicant's 5 shares of Greeley Irrigation Company, 4 shares of Rural Ditch Company and portion of water rights decreed in case no. 2001 CW274, as replacement water solely for the Durham Pit site, Kurtz Pit site (M-1999-006) and Western Sugar Mine site (M-2010-049), for as long as there are depletions at these gravel pit sites or until such time as another replacement sources are obtained. A copy of the affidavit is attached to this letter. For the purposes of this SWSP, this affidavit will be accepted for the dedication of the shares; however, if the State Engineer determines that a different affidavit or dedication process is necessary to assure proper dedication of the shares, additional information may be required prior to future SWSP approvals.