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to a lesser extent, by contributions from rainfall and snowmelt runoff, and even shallow ground water <br />discharge. Measured discharge ranged from 3.36 cfs to 24.4 cfs during the irrigation season. For <br />periods of no irrigation, flow measurements varied from 1.7 cfs up to 5.7 cfs. The highest discharge <br />measured during the irrigation period was 24.4 cfs in July, and the lowestoccurred in October(3.36 <br />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 NewHorizon2miningarea. Allhistoricdata(prior <br />to January, 1988) for each site were compiled and are presented as water quality reports in <br />Peabody Appendix 7-7 and Peabody Appendix 7-9. <br />Specific Tuttle Drawwater 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 ofthe New Horizon 2 mining area (see Map 2.04.7-1 ). Monitoring ofwaterquality atthis <br />site was initiated in July of 1986 for purposes of collecting baseline information forthe New Horizon <br />2 mining area (see Peabody Appendix 7-9). <br />For both seasons, the water type at Site SW-N101 was a calcium magnesium sulfate. The mean <br />milliequivalent values for each major ion increased during periods of non-irrigation. <br />Average pHmeasured atSW-N101 was less during periods ofno irrigation (7.64) compared to the <br />mean pH representative of the irrigation season (7.82). However, the pH range was larger (7.23 - <br />8.05)during the non-irrigation months than when irrigation was occurring (7.44 - 7.98). Average <br />TDS dramatically increased at SW-N101 when irrigation shut down, being almost three times the <br />mean (2,942 mg/I) determined atthis site when irrigation occured (1,026 mg/I). Increases in the <br />major ions occured after irrigation stops greatly influenced increase in TDS, while the relative <br />proportions (percent milliequivalents) of each ion remained fairly constant. <br />• <br />(Revised 6/28/ot) 2.04.7-27 <br />