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the flume location placed in the lower canyon. Flows originating from fractured shales and <br />sandstone were measured between 15 and 50 gpm. Quality ranged from 504 to 583 conductivity <br />and 6.5 to 8.7 pH. Current use is livestock and wildlife watering and for aesthetics as the flow <br />creates a stream running through the ranchette development in the canyon. These springs are a <br />valuable contribution to surface flow making Santistevan Canyon a perennial stream. <br />Surface Water Monitoring <br />WFC gathered stream flow and water quality baseline data from Santistevan, Apache and <br />Ciruela Canyons in 1984. These data were gathered as per the requirements of permit <br />stipulations and are presented in Exhibit 12, Annual Hydrology Report. Surface water flow and <br />water quality data for Apache Canyon and Purgatoire River have been updated in 2011 and are <br />summarized in the Whetstone report in Exhibit 8, Hydrology Information. <br />During the spring of 1984, flume stations were constructed and Stevens Type F <br />continuous recorders were calibrated and placed in operation on Apache and Santistevan <br />Canyons on April 5 and 20, respectively. These stations were maintained for a period of 14 <br />months until sufficient data were collected to differentiate seasonal flow variations. Also, <br />Ciruela Canyon stream flow has been monitored quarterly at two surface stations, one above the <br />Golden Eagle Mine and one at the confluence with the Purgatoire River below the Golden Eagle <br />Mine. All data collected from the 3 canyons are summarized below. <br />Santistevan Canyon Santistevan Canyon is a perennial stream. Flows ranged from <br />0.014 to greater than 30.4 cfs with an average 24 -hour mean of 0.096 cfs. Exhibit 12, Annual <br />Hydrology Report, presents the daily record at mean 24 -hour and peak discharges recorded <br />during the year while the hydrograph summarizes the mean 24 -hour variations. Runoff <br />calculations indicate an annual discharge of 148 acre -ft. The majority of this runoff was <br />recorded during the summer months in the form of heavy localized thunderstorms. These storms <br />produced extreme spikes in the hydrograph, two of which exceed the recording limits of the <br />flume station. A relatively <br />TR -56 2.04 -31 Revised 1/31/11 <br />