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• remainder of each year, the ditch is temporarily turned on to provide water for filling cisterns and <br />stock ponds. Water delivered via this lateral and the rest of the surrounding ditch system provides <br />a water source for irrigation, drinking water and livestock use, and is the dominate seasonal <br />influence of the hydrologic regime in the vicinity of the New Horizon Mine. <br />As a part of baseline studies initiated in and near the New Horizon 2 mining area, three surface <br />water monitoring sites were established along the West Lateral for obtaining flow and water quality <br />baseline information. These sites were SW-N104, SW-N105 and SW-N106 and were located on <br />the West Lateral at points upstream, midway and downstream of the New Horizon 2 mining area <br />(see Map 2.04.7-1A). Flow and water quality data were collected at these sites since July of 1986, <br />and are presented as Stream Gaging Report and Water Quality Reports presented in Peabody <br />Appendices 7-5 and 7-9, respectively. Monitoring of the site SW-N106 has been discontinued. <br />However, New Horizon Mine continues to monitor SW-N104 and SW-N105. <br />Surface water Site SW-N104 is located on the West Lateral, in the city limits of Nucla. <br />Instantaneous discharge measurements were made at SW-N104 in the diversion splitte box, and <br />• continuous flow monitoring were conducted at this site via a stilling well and a digital water level <br />recorder located in the channel upstream of the splitte box. Coupled with the continuous stage <br />record, measurement of instantaneous discharge over time will yield a stage versus discharge <br />rating curve for SW-N104. Discharge measurements indicated that irrigation flow varied from a <br />high of 27.6 cfs (August, 1986) to a low of 14.9 cfs (August, 1987). Flow occasionally receded to <br />a trickle during the irrigation season, when water in the ditch was temporarily turned off due to <br />routine maintenance or unforeseen problems up-stream in the main ditch. <br />Surface water Site SW-N105 is located on the West Lateral at about the midway point between <br />Sites SW-N104 and SW-N106. Instantaneous discharge measurements were conducted at this <br />site in a wooden splitte box. Measured flow values are summarized for each month and are <br />included with stream gaging flow reports presented in Attachment 2.04.7-8 (Peabody Appendix 7- <br />5). Measured discharge ranged from 9.2 cfs (August, 1987) up to 14.7 cfs (May, 1987). <br />Surface water Site SW-N106 was the most-downstream monitoring site located on the West <br />Lateral irrigation ditch. As at SW-N104, instantaneous discharge measurements were made at <br />• SW-N106 in the diversion splitte box, and continuous flow monitoring was conducted at this site <br />REVISED JULY 2006 2.04.7-35 <br />