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State Reg. <br />below the coal and moves dowri the slope to the final Iriglrwall. <br />At this point, the spoils water either recharges the bedrock <br />ground water system exposed at the highwall or discharges to <br />the surface water system. <br /> Flow discharging from the Seneca II Mine area via surface water <br />~ <br />~~ <br />~ j runoff, spoils springs and seeps, and subsurface flow tlrruuylr <br />di <br />t <br />d <br />i <br />b <br />d <br />il <br />i <br />l t <br />th <br />f <br />t <br />t <br />,~ .~ <br />. un <br />s <br />ur <br />an <br />e <br />spo <br />er <br />a <br />e sur <br />ace wa <br />er system <br />s <br />ma <br />o <br />J <br />,~ <br />monitored continuously at NPUES discharge points 002, 003 and <br />~C ~ OU4. Nydrographs for these sites based on period-of-record <br /> mean daily flow data are presented in Figures 7-21 tlrrouylr <br /> 7-29. Mean daily flow tables for each year of record have been <br /> presented in the AHRs; annual mean daily flow for the years <br /> 1981 tirrougir 1986 are sunmrarized in Appendix 7-4A; and n~ontlrly <br /> mean daily flow data are summarized in Tables 7-52 tlrrouglr <br /> 7-54. As is evident from the data for these NPDES sites, mean <br /> daily flow is extremely variable from month to muutlr and ~•ear <br /> to year. These variations are caused in whole or in part by <br /> the following factors: the flux of the surface and ground ~• <br /> water systems due to natural climatological and meteorological <br /> clrariges; mining disturbance of the ground and surface water <br /> systems effecting changes in ground and surface vrater <br /> discharges; and mining-related disturbance to the surface water <br /> system, in particular, pumpage of water from the sediment ponds <br /> for road dust suppression and truck washing. Because of these <br />__ factors, it is extremely difficult to confidently quantify arty <br /> clranyes in discharge from the mine area which niay have occurred <br /> since 1981. In addition, because little if any prerriinir~y <br /> baseline flow data were gathered on either Grassy, Little <br /> Grassy, Cow Camp or Fish Creeks prior to mining, it is <br /> extremely difficult to quantify any chanyes in flow in ttrese <br /> drainages since mining began. <br />Within the Grassy Creek drainage, there are two monitoring <br />sites, SW-S2-1 and SW-S2-2, located upstream and dovmstr-eani <br />from mining, respectively, which are monitored monthly for <br />instantaneous flow. Within the Little Grassy Creek drairiaye, <br />7-175 Revised 10/01/86 <br />