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Depth to Ground Water <br />(Feet) <br />Percent Reduction in CU Credit' <br />Native Grass <br />Alfalfa <br />1 <br />85% <br />100% <br />2 <br />50% <br />90% <br />3 <br />30% <br />75% <br />4 <br />20% <br />50% <br />5 <br />15% <br />35% <br />6 <br />10% <br />20% <br />7 <br />5% <br />15% <br />8 <br />0% <br />10% <br />River Valley Resource Pit SWSP Page 7 of 8 <br />February 22, 2012 <br />The Applicant shall modify accounting to reflect that the credit from any dried up fields <br />containing alfalfa or native grass was assessed in the following manner: <br />(a) For fields deep tilled or chemically treated to successfully kill alfalfa or native grass, <br />100% credit will be given for consumptive use as otherwise computed under the <br />conditions of this approval. <br />(b) For fields not deep tilled or chemically treated to successfully kill alfalfa or native <br />grass, records of monthly monitoring of depth to ground water at existing irrigation <br />wells or existing or new monitoring wells or piezometers within %4 -mile of each alfalfa <br />or native grass field must be maintained. Credits will be reduced according to the <br />following table when depth to ground water is less than the depth assumed to <br />provide no significant contribution to native grass or alfalfa growth. Measurements <br />taken at the start of each month will determine the necessary reduction in credit to <br />be applied during the following month. The applicant may use another methodology <br />upon review and approval by the state engineer and division engineer. <br />1. Adapted from EVAPOTRANSPIRATION AND AGRONOMIC RESPONSES IN FORMERLY <br />IRRIGATED MOUNTAIN MEADOWS, South Park, Colorado, March 1, 1990; Revised September 1, <br />1991 <br />15. This substitute water supply plan may be revoked or modified at any time should it be <br />determined that injury to other vested water rights has or will occur as a result of this plan. <br />Should this substitute water supply plan expire without renewal or be revoked prior to <br />adjudication of a permanent plan for augmentation, all excavation of product from below the <br />ground water table and all other use of water at the pit must cease immediately. <br />16. In accordance with amendments to §25 -8- 202(7), C.R.S., and Senate Bill 89 -181 Rules and <br />Regulations adopted on February 4, 1992, the State Engineer shall determine whether the <br />substitute supply is of a quality to meet requirements of use to senior appropriators. As <br />