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State Reg. <br />~~~' <br /> <br />obtain were for Site 26; these limited data are presented in <br />Tables 7-58 and 7-59 and summarized at the end of the table by <br />year for June through September. The record shows that at Site <br />26 flow has been extremely variable from month to month and <br />year to year. These dramatic variations may be reflective of <br />the lack of data for a substantial portion of the record. <br />During the growing season, flow ranges for June from 1.6 cfs in <br />1981 to 42.6 cfs in 1985 with an average of 22.9 cfs; for July, <br />from 3.9 cfs in 1979 to 16.0 cfs in 1984 with an average of 8.9 <br />cfs; for August, from 0.6 cfs in 1981 to 6.0 cfs in 1984 with <br />an average of 2.2 cfs; and for September, from 1.2 cfs in 1981 <br />to ?.8 cfs in 1985 with an average of 4.0 cfs. <br />Within the Cow Camp Creek drainage, site NPDES 004 monitors <br />flow from the disturbance area. Located approximately 1000 <br />feet downstream from NPDES 004 is site SW-S2-6 which monitors <br />Cow Camp Creek before it exits the permit area (its drainage <br />area includes the mine area and areas not to be affected by <br />mining). For purposes of more accurately evaluating historic <br />flow and quality of water from the mine area and predicting <br />impacts to Fish Creek, only the data from site NPDES 004 will <br />be used in this analysis. Flow data for the period of record <br />are presented in Table 7-54; for the months of June through <br />September, flow data are summarized for each year in Table <br />7-6U. For June, flow ranges from 0.195 cfs in 1986 to 0.468 <br />cfs in 1984; for July, from 0.006 cfs in 1982 to 0.187 cfs in <br />1985; for August, from 0.006 cfs in 1982 to 0.138 cfs in 1984; <br />and, for September, from 0.010 cfs in 1982 to 0.138 cfs in <br />1984. It is evident front these data that flow at site NPDES <br />004 has increased since mining began in the summer of 1982. <br />Based or. one year of data collected prior to mining, flaw was <br />intermittent. Subsequent to mining, flow became perennial. <br />From the flow record for the late summer months, August and <br />September, the record indicates that base flow discharge has <br />stabilized at approximately 0.120 cfs. The trend of this base <br />flow record has been graphically superimposed over hydrograph c <br />7-195 kevised 10/01/86 <br />