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• ~ measurements were only periodically collected at this site since July of 1986. A crest-stage gage <br />has been installed at this site for the purpose of recording high water marks of large runoff events <br />(rainfall or spring snowmelt runoff). These high water marks were used to determine the peak <br />discharge of large runoff events using indirect discharge measurement techniques. Since <br />monitoring began (July, 1986), only four events were calculated using indirect techniques: 1) 39 <br />cfs, 11/11/86; 2) 35 cfs, 5/20/87; 3) 34 cfs, 6/22/87; and 4) 96 cfs, 8/27/87. The listed dates <br />represent the respective visit dates that high water marks were measured at the crest gage. All <br />events likely resulted from unusually intense summer thunderstorms, although no information of <br />those particular storms was collected. Monitoring of this site has been discontinued. <br />Finally, Site SW-N103 was located downstream of SW-N107 on Calamity Draw. Discharge was <br />measured at this site on a monthly basis since July of 1986 (See Attachment 2.04.7-8 (Peabody <br />Appendix 7-5}. As at the other sites established along Calamity, flow at SW-N103 was artificially <br />controlled by irrigation, and to a lesser extent, by contributions from rainfall and snowmelt runoff, <br />and even shallow ground water discharge. Measured discharge ranged from 3.36 cfs to 24.4 cfs <br />during the irrigation season. For periods of no irrigation, flow measurements varied from 1.7 cfs <br />• up to 5.7 cfs. The highest discharge measured during the irrigation period was 24.4 cfs in July, and <br />the lowest occurred in October (3.36 cfs). Monitoring of this site has been discontinued. <br />Tuttle Draw. Discussion on stream flow in Tuttle Draw is found on pages 7-112 to 7-116 in <br />Volume B of New Horizon 1 Reclamation Plan. <br />Streams -Water Quality. This section presents discussions of water quality data collected at <br />surface water monitoring sites established at the New Horizon 2 mining area. All historicdata (prior <br />to January, 1988) for each site Were compiled and are presented as water quality reports in <br />Attachment 2.04.7-11 (Peabody Appendix 7-9) and Attachment 2.04.7-9 (Peabody Appendix 7-7). <br />Specific Tuttle Draw water monitoring data is included by reference to Tab 7 (Section 7) in Volume <br />B, pages 7-123 to 7-132, of New Horizon 1 Reclamation Plan. <br />Surface water monitoring Site SW-N101 was located in Calamity Draw upstream of the eastern <br />boundary of the New Horizon 2 mining area (see Map 2.04.7-1A). Monitoring of water quality at <br />• this site was initiated in July of 1986 for purposes of collecting baseline information for the New <br />REVISED JULY 2006 2.04.7-32 <br />