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Reach of the river are from a few feet to about 30 to 40 feet. The Sun Coal <br />• Company production well drilled at the loadout facility on the north side of the <br />river encountered black shale and some coal at a depth of 25 feet. Directly <br />across the river at the crusher facility, shale was encountered at about 25 to <br />30 feet, indicating the bottom of the alluvium. Drillers' logs on these two <br />wells, permit numbers 92725 and 22689F, are contained in Section 2.03.10. <br />Because water in river alluvium is associated with the Yampa River, the <br />water quality in the alluvium is similar to that of the river during base flow. <br />Water from wells in the Yampa River alluvium from the head waters to below <br />Hayden is classified as a calcium/magnesium bicarbonate type. The dissolved <br />solids range from about 100 to 350 mg/1; and, similarly, the hardness ranges <br />from 100 to 350 mg/1. The wide variation in sulfate concentrations is probably <br />in response to local oxidation/reduction phenomenon in the alluvium. Hydrogen <br />• sulfide is present in some wells. Sodium and chloride are low, ranging from <br />about 2 to 25 mg/1. <br />Water quality of the ephemeral drainage along Coat Yiew Gulch is discussed <br />in Section 2.04.7. Data are limited to warrant Grassy Creek water quality <br />characterization. <br />General Geology and Groundwater Hydrology <br />The Meadows No. 1 mine is located in the southeastern portion of the <br />Washakie structural basin. In Colorado, this Basin is bounded on the east by <br />the Park Range, on the south by the White River Uplift, and on the southwest by <br />the Axial Basin Anticline. <br />In the vicinity of the permit area, the structure of the basin has been <br />• modified by many structural folds. The largest of these is the Tow Creek <br />- 59 - (Rev. 5/86) <br />