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-zl- The Division requested that the applicant modify the sampling plan origina!Ily submitted to meet the objectives of Rule 4.24.5 of the Colorado Permanent Regulatory Program. Colowyo subsequently committed to installing a shallow ground water well downgradient of the Gossard Loadout to monitor ground water levels and quality. The well will be monitorc~i quarterly and results will be submitted to the Division annually. The analyses will include all of the parameters listed in Section Vr-Hydrologic Balance - Ground Water of this document. ELKHORN CREEK The lower reaches of Elkhorn Creek contain unconsolidated streamlaid deposits which are sufficient to constitute an AVF. The applicant has not presented sufficient information to allow the Division to assess the irrigation properties of the potential RVF. In a joint field visit between Colowyo and the Division, it was mutually decided that the vegetation growing in the lower reaches of Elkhorn Creek is probably subirrigated. Therefore, unless the applicant presents sufficient evidence to the contrary, the lower reaches of Elkhorn Creek (as shown on Map 10) constitute an AVF. Map 17 shows that the Land use in the AVF is pastureland. Baste upon the information provides by the applicant and the Division's investigation, the Division makes the following finding. Pursuant to Rule 2. 06.8(5)(a)(iii), the Division finds that surface coal.mining and reclamation would be conducted to preserve, throughout the mining and rc~lamation process, the essential hydrologic functions of the alluvial valley floor. Because no disturbance is planned for the Elkhorn Creek drainage basin, no impact on the essential hydrologic functions of the AVF is anticipated. The Elkhorn drainage basin is hydrologically isolates from the mining area. As a;result, no hydrologic monitoring is required on the Elkhorn Creek AVF. VIII. Probable Hydrologic Consequences and Cumulative Hydrologic Impact Assessment - Rule 2.05.6(3) In the Draft Findings document dated December 23, 1981, the Division noted a number of concerns with regard to the probable hydrologic consequences statement prepared by the applicant. Specifically, the Division asserted that insufficient data and analyses were contained in the application to prepare a complete and thorough cumulative hydrologic impact assessment. In response to that document, Colowyo submitted a revised probable hydrologic consequences statement on May 24, 1982. Sufficient site-specific hydrologic data, analyses, and projections were includes in these responses to satisfy the Division's concerns.