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Holcim South Platte Combined SWSP April 14, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 33 of 37 <br /> changed by this SWSP shall be reduced by any ongoing sub-irrigation from <br /> groundwater. In order to ensure the required dry-up conditions exist during the <br /> approval period of this SWSP, and to ensure no sub-irrigation from groundwater is <br /> occurring, the Applicant shall provide records of monthly monitoring of depth to <br /> groundwater for all land associated with the change of water right(s) in this SWSP. <br /> Information regarding depth to groundwater may be provided using existing irrigation <br /> wells, existing or new monitoring wells, or piezometers located on the dried-up fields. <br /> The Applicant may utilize wells or piezometers located within '/ mile of each field <br /> provided that the Applicant can demonstrate the depth to groundwater information <br /> available off-site is representative of the depth to groundwater on the dried-up land. <br /> The Applicant shall modify its accounting to reduce the amount of the calculated HCU <br /> that may be claimed in this SWSP according to the table below. Measurements taken <br /> at the start of each month will determine the necessary reduction in credit to be <br /> applied during the following month. The Applicant may use another methodology upon <br /> review and prior approval by the state engineer and division engineer. (Construction <br /> of monitoring holes/wells, or piezometers requires that permits or notices be <br /> obtained as described in Table 1 of the Water Well Construction Rules.) <br /> Depth to Percent Reduction in Calculated HCU' <br /> Groundwater (Feet) Native Grass Alfalfa <br /> 1 85% 100% <br /> 2 50% 90% <br /> 3 30% 75% <br /> 4 20% 50% <br /> 5 15% 35% <br /> 6 10% 20% <br /> 7 5% 15% <br /> 8 0% 10% <br /> 1 . Adapted from EVAPOTRANSPIRATION AND AGRONOMIC RESPONSES IN <br /> FORMERLY IRRIGATED MOUNTAIN MEADOWS, South Park, Colorado, March <br /> 1, 1990; Revised September 1, 1991 <br /> 22. Dewatering at the Wattenberg Pit, W.W. Farms Pit, Tull Pit, DPG Pit, and Irwin-Thomas <br /> Pit will produce delayed depletions to the stream system. As long as the pits are <br />