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2.04.5 General Description of Hydrology and Geology . (1) Each application shall contain a description and map, prepared in accordance with 2.10, of the geology, surface and ground water systems, including water quality and quantity, of all lands within the proposed permit area, the adjacent area, and the general area. The description shall include information on the characteristics of all surface and ground waters within the general area, and any water which will flow into or receive discharges of water from the general area. The description shall be prepared according to 2.04.5 and 2.04.7, and conform to the following: (a) Information on surface and ground water systems including water quality, water quantity, and geology related to the hydrology of areas outside the permit area and within the general area shall be provided by the Division, to the extent that this data is available from an appropriate Federal or State agency. (b) If this information is not available from those agencies, the applicant may gather and submit this information to the Division as part of the permit application. (c) The permit shall not be approved by the Division until this in- formation is made available in the application. (2) The use of approved modeling techniques may be included as part of the permit application, but the same surface and ground water information may be required for each site as when models are not used. • (3) Permit applications may comply with the requirements of 2.04.5(1), 2.04.6(1)(a), and 2.04.7 by providing accurate descriptive and predictive information relating to geology, water quality and quantity for the area to be affected over the estimated life of the operation based upon extrapola- tion by an expert . in the field from documented data on the geology, water quality and quantity of similar area, provided that the data used by the expert is included within the permit application, the expert opinion is approved by the Division and all such data are made available to the public for review and comment. RESPONSE (1) (Z) (3) The project region is in the low mountains and plains between the Yampa River and the Williams Fork of the Yampa River, as seen on Figure 1. The proposed Hayden Gulch Mine is situated at the head of Hayden Gulch, at the crest of the divide between the drainages. The project area drainages are shown on Figure 1. Drain- age is to the north and south from the crest of the divide at about 7500 ft. elevation. Hayden Gulch and Dowden Gulch join the Williams Fork. Dry Creek joins the Yampa River. All three streams are ephemeral.