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<br />- 4 - <br />20 of the annual report except that the base level of flow was <br />somewhat lower in 1983 than during 1982. Also, an interesting <br />point is that peak discharges occurred either in January and <br />February or in September and October, and not during the runoff <br />season. <br />The summary of spring flow data for the other springs in Table 24 <br />shows that discharge is seasonal. The highest flows in 1983 for <br />the North Spring, which appears to issue from a Recent age gravel <br />cap rock (page III-54 of the permit application ), occurred during <br />the snowmelt runoff period in March and April. The highest flows <br />in 1983 for the South Spring, which appears to issue from sandstone <br />lenses within the Iles Formation (page III-55 of permit <br />application), occurred after snowmelt runoff, during the month of <br />June. The South Spring appears to be the most significant spring <br />in terms of quantity of flow. Historical records prior to 1983 <br />only exist for the North Spring and the South Spring, and for these <br />springs, 1983 data do not show any significant variations from past <br />flows. <br />1.1.7 Mine Inflows <br />Plots of the measured discharges for 1983 from the No. 5 and 9 <br />Mines are given on Figures 12 and 13, respectively. The 1983 <br />average discharge rate from the No. 5 Mine was 710 gpm and the <br />average discharge rate for the No. 9 Mine was 110 gpm (Page 3 of <br />the report). The measured mine inflow rates did not significantly <br />exceed the predicted values presented in Table III-20 of the permit <br />application document. The 1983 predicted inflow values from faults <br />and seepage ranged from approximately 170 to 870 gpm for the No. 5 <br />Mine and from 200 to 320 gpm for the No. 9 Mine. (Page 3 of the <br />report and Table III-20 of the permit application). <br />1.2 Ground Water Ouali <br />1.2.1 Trout Creek Sandstone <br />Due to the stratigraphic location of the Trout Creek Sandstone <br />aquifer below the F seam and the prevailing hydraulic gradients, <br />the potential water quality impact to this unit from the mining <br />operations is not considered to be significant and no water quality <br />impacts to this unit were predicted in the permit application (see <br />page IV-116). <br />Both the No. 5 Mine Well and the Okie Plaza Well are designated as <br />water supply wells, and water quality samples for these wells were <br />collected and analyzed once during 1983 for Colorado drinking water <br />parameters and other trace elements. The raw data for this <br />sampling is contained in the 2nd Quarter 1983 hydrologic monitoring <br />