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• DISCUSSION_OF_HYDfiOLOGY <br />HUEHARD CREEK <br />Somerset Mine extended the 5 West Main entries under and beyond <br />Hubbard Creek during 1981. The Operator recognized the relative <br />location of the entries and Hubbard Creel; and designed the entry <br />widths, pillar size, and entry spacing to preclude pillar failure, <br />subsidence, and the possible interception of Hubbard Creek flow. <br />Refer to Appendix: F for stability calculations. <br />The advancing entries passed under intermittant roof cracks <br />which discharged various quantities of water. The water inflows <br />have generally decreased as the distance to the working faces <br />increased. Refer to the 1982 mine inflow study shown on Map <br />E8-.:361 (Volume ~) and the 1983 mine inflow study submitted <br />July 25, 1983. The Operator has made a continuing appraisal <br />of the inflows and their possible impacts on downstream water <br />users. The Operator has concluded that there has not been any <br />adverse impacts on downstream water rights based on the following: <br />1. The Operator has monitored the water quality of the mine <br />inflows, Hubbard Creek, and a monitoring well in the alluvial <br />deposit below Hubbard Creek:. Also a grab sample was taken <br />of a drill hole water source shown on the 1982 and 1983 <br />• mine inflow studies of the v West Main - Hubbard Creek <br />area. Refer to pages '.~?4-',1 - 2.U4-:~8 for the mine inflow <br />water quality. Water quality for Hubbard Creek: is shown <br />on pages 2.U4-46 and 2.U4-47. Water quality for the monitoring <br />well is shown on pages 2.U4-9ii Z.~?4-29v. The water <br />quality for the 1982 mine inflow study has been submitted <br />to the Division. Refer to-E:;habits 1-4 of this Appendix; <br />for a comparison of water quality analyses. A review o4 <br />the water analysis data referenced above does not indtcate <br />Hubbard Creel.. as a source for the mine inflows. <br />_. The water available to the down stream water users is dependent <br />on the snowpacl.: at the higher elevations and the rate of <br />snow melt which is determined by the seasonal temperature <br />changes. E::amination of the diversion records of the Deertrail <br />Ditch and the Mayes Ditch indicates as follows: <br />2.1 Mayes Ditch <br />2.11 The Mayes Ditch has a decreed capacity of 0.375 <br />cfs and a diversion capacity of 0..75 cfs. <br />2.12 It appears that the water is used for irrigation <br />with diversion begining during late April and <br />er,tending into early October. The quantity of <br />water diverted from Hubbard Creek: has varied <br />• from U.4i~Q cfs to U.U c4s during the irrigation <br />seasons of the 11 year 1972-1982 period (see <br />the attached records). <br />1 <br />