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r- Mr. Ray Dunn Page 3 May 10, 2004 i. For fields deep tilled or chemically treated to kill alfalfa, 100% credit will be given for consumptive use as otherwise computed under the conditions of this approval. ii. For fields not deep tilled or chemically treated to kill alfalfa, records of monthly monitoring of depth to groundwater at existing irrigation wells or existing or new monitoring wells or piezometers within'/<-mile of each alfalfa field and capable of measuring ground water levels to a depth at least 8 feet below the lowest point of elevation of the field must be maintained. The wells or piezometers to be used must be identified and located by UTM coordinates. Credits will be reduced according to the following table when depth to groundwater is less than the depth assumed to provide no significant contribution to alfalfa growth. Measurements of depth to ground water shall be recorded on forms acceptable to the Division Engineer and submitted to the Division Engineer's Office by the 10'~ of each month beginning on May 10, 2004 and continuing through November 10, 2004. Measurements taken at the start of each month will determine the necessary reduction in credit to be applied during the following month. Depth to Ground Water (Feet) Percent Reduction in CU Credit Depth to Ground Water (Feet) Percent Reduction in CU Credit 1 100% 5 35% 2 90% 6 20% 3 75% 7 15% 4 50% 8 10% 8. Any request for amendment must include identification of the subject well (pit), an estimate of the amount of water that will be lost, an update of the total stream depletions by reach and month including post-plan depletions, and identification of the source of additional replacement water. Approval of an amendment will be contingent upon demonstrating it has sufficient replacement water to cover the additional well depletions. 9. The approval of this substitute water supply plan does not relieve the applicant of the requirement to obtain a water court approved permanent plan for augmentation to ensure the permanent replacement of all depletions, including long-term evaporation losses after the gravel mining operations have ceased. Application for an augmentation plan should be made three years prior to the completion of mining with the intent of obtaining a decreed plan by the completion of mining. Approval of this substitute supply plan does not imply a position by this office on any related litigation. 10. This substitute water supply plan shall have no precedential or evidentiary force, and does not constitute an admission or statement of position in any other proceeding. This plan shall not be construed as concurrence with any findings of fact or conclusions of law contained herein, or with the engineering methodologies used by the applicant. 11. This plan shall be valid through May 31, 2006, unless otherwise revoked or modified.