2016-02-03_PERMIT FILE - C1981038 (2)

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52.04 APPLICATION FOR PERMIT FOR SIIRFACE OR IINDERGROUND MINING ACTIVITIES -- • MINIMUM REQUIREMENTS FOR INFORMATION ON ENVIRONMENTAL RESOURCES. 2.04.7 Hydrology Description. (1) (b) (Cont'd,) core drilling within this strata indicated [hat frac- ture zones are not well developed. Similar observa- tions were made in the underground mine. Fracture zones or zones of lost circulation do not appear to ex- tend from hole to hole. Fracture and fault zones, al- though encountered, are not well developed (refer to Mau 2-8). The groundwater flow direction in the sandstone strata below the "D" coal seam is from the recharge area near the outcrop of these strata north toward the lower parts of the basin. An interpretation of the potentio- metric surface in this water bearing strata is shown on Map 4-2. The "Po[entiometric Surface Map of the Mesaverde Forma- tion", Map 4-2, was prepared utilizing exploration data obtained via geophysical logging during June and July, 1982. Table 10, entitled "Static Water Levels in Ex- • ploration Drill Holes" located in Volume 10 (confiden- tial) , was compiled primarily from the geophysical logs run during the exploration process. Exploration pro- jects completed in earlier years were not suited to ob- taining hydrology data. In drill holes 26 through 48, undocisnented drill-log- ging procedures were undertaken. Few field records of the type and amount of drilling fluid, casing (if any), and logging activities are available. It is suspected that many of the holes were filled with water in order to facilitate [he electrical logs (spontaneous poten- tial and resistivity), such that the static water level recorded should be considered dubious at best. In the holes n,snb ered 50 through 59, more documentation ex- ists. These holes were drilled with bentonite based mud chich can greatly inhibit the hydrologic properties due to mud cake within the drill hole. The holes used for construction of the potentiometric surface map are numbered 60 through 72. During this phase of exploration, a radical change from convention- al drilling mud to air and foam was incorporated. When Added 12/26/84 Revised 12/26/84 Revised 02/26/85 Revised 10/01/87 _ 34