2016-02-03_HYDROLOGY - M1979191 - Laserfiche WebLink

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Middle Poudre Combined SWSP Page 7 of 8 February 3, 2016 existing or new monitoring wells, or piezometers located on the dried-up fields. Applicant may utilize wells or piezometers located within 1/4 mile of each field provided that the Applicant can demonstrate the depth to ground water information available off-site is representative of the depth to ground water on the dried-up land. The Applicant shall modify its accounting to reduce the amount of the calculated HCU that may be claimed in this SWSP according to the table below. Measurements taken at the start of each month will determine the necessary reduction in credit to be applied during the following month. The Applicant may use another methodology upon review and prior approval by the state engineer and division engineer. (Construction of monitoring holes/wells, or piezometers requires that permits or notices be obtained as described in Table 1 of the Water Well Construction Rules.) Depth to Ground Water Percent Reduction in Calculated HCU' (Feet) Native Grass Alfalfa 1 85% 100% 2 50% 90% 3 30% 75% 4 20% 50% 5 15% 35% 6 10% 20% 7 5% 15% 8 0% 10% 1 Adapted from EVAPOTRANSPIRATION AND AGRONOMIC RESPONSES IN FORMERLY IRRIGATED MOUNTAIN MEADOWS, South Park, Colorado, March 1, 1990; Revised September 1, 1991 17. Dewatering at the Three Bells Pit will produce delayed depletions to the stream system. As long as the pit is continuously dewatered, the water returned to the stream system should be adequate to offset the depletions. However, once dewatering at the site ceases, the delayed depletions must be addressed. Once dewatering at the sites cease, the delayed depletions must be addressed, including depletions resulting from the gradual refilling of the pit. Accordingly, dewatering at the Three Bells Pit is required to continue during the term of this approval. At least three years prior to completion of dewatering, a plan must be submitted that specifies how the post pumping dewatering depletions (including refilling the pit) will be replaced, in time, place and amount. Monthly dewatering volumes, as reported through each meter, must be included with the submitted accounting. 18. If reclamation will produce a permanent water surface exposing groundwater to evaporation, an application for a plan for augmentation must be filed with the Division 1 Water Court to include, but not be limited to, long-term evaporation losses and lagged depletions. 19. If a lined pond results after reclamation, replacement of lagged depletions shall continue until there is no longer an effect on stream flow. 20. To assure that depletions from ground water evaporation do not occur in the unforeseen event, or events, that would lead to the abandonment of the Three Bells Pit, a bond in the amount of $3,294,000 has been obtained through the DRMS for lining or backfilling of the pit. Additionally, if the dewatering at the Three Bells Pit is discontinued, the bond can finance the completion of the lining of the pit or backfilling, thus preventing depletions to the stream system.