2016-02-03_HYDROLOGY - M1985112 - Laserfiche WebLink

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Loloff Pit SWSP Page 3 of 7 January 27, 2016 deliveries of GIC water incur an immediate surface return flow obligation of 23.7% for direct deliveries and 20.1% for Fossil Creek deliveries, which corresponds to surface return flow obligations of 4.41 acre-feet and 0.20 acre-feet, respectively, for this plan period. Pursuant to paragraph 6.7.6 of case no. 1996CW658, the subsurface component of the return flow obligation shall be calculated by multiplying the 5-year running average annual farm headgate deliveries of GIC water (direct flow water and Fossil Creek Reservoir water). The average annual river headgate deliveries for the last 5 years are shown on the attached Table No. 3. The subsurface return flow obligations for the GIC direct deliveries and Fossil Creek Reservoir deliveries are 4.12 acre-feet and 0.07 acre-feet during this plan period, respectively (see Table 3). The area formerly irrigated by the subject GIC share continues to contain residual pasture grass. The measured depth to ground water in the area ranges between 6 and 7.5 feet. In order to ensure the required dry-up conditions exist during the approval period of this SWSP, and to ensure the historical consumptive use calculated for the ditch shares changed by this SWSP do not include any credit resulting from the consumption of ground water, the Applicant has applied a 5% reduction to the monthly consumptive use credits claimed for their GIC share. Based on conversations the Applicant has had with the GIC, the Applicant can request delivery of the yield from the subject share at either the 16th Street or F Street augmentation stations. The 16`h Street augmentation return (WDID 0302319) is located approximately 1.8 miles downstream of the point of depletions and downstream of the Ogilvy Ditch headgate, which is the first senior water right that could be injured by depletions from the Loloff Pit. The F Street return (WDID 0302320) is located approximately 7.9 miles upstream of the point of depletions and upstream of the Ogilvy Ditch headgate. At times when the Ogilvy Ditch is calling, the Applicant must make replacements at or above the Ogilvy Ditch headgate. A transit loss may be assessed by the water commissioner for the delivery of such replacement water. Greeley Lease The applicant has entered into a rental agreement with the City of Greeley for 12.00 acre- feet of fully consumable water that has been changed for augmentation use. A copy of the agreement showing the monthly replacement schedule was provided with this SWSP request and is attached. Greeley anticipates delivering the replacement water to the Cache la Poudre River at Greeley's wastewater treatment plant (WDID 0302312), located approximately 0.42 mile upstream of the point of depletions and upstream of the Ogilvy Ditch headgate. A transit loss may be assessed by the water commissioner for the delivery of such replacement water. Any releases of replacement water at a location other than the Greeley wastewater treatment plant must be coordinated with the water commissioner to insure the proper transit losses are applied and that no intervening water rights are injured. A water balance showing projected depletions, return flow obligations, and replacements for this plan period is provided in the attached Table 4. 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.