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Nucla and Nucla East Surface Water Monitoring Program <br /> (July 1987 - Present) <br /> Monitoring Frequency Monitoring Equipment <br /> Site Name Location Drainage Flow Quality Instrumentation Remarks <br /> SW-N1 Upper Tuttle Draw Monthly Monthly* None This site is a natural reach of Tuttle <br /> Draw. Flow is determined by current <br /> metering <br /> SW-N2 Lower West -- -- -- Monitoring discontinued 11/80 <br /> Return Ditch <br /> SW-N3 Lower Tuttle Draw Monthly Monthly* -- This site is a natural reach of Tuttle <br /> Draw. Flow is determined by current <br /> �n metering <br /> i <br /> ^' SW-N4 Lower East -- -- -- Monitoring discontinued 11/80 <br /> Return Ditch <br /> SW-N5 and DA0001 Mid-Lower Continuous Weekly/ Stevens F-type This site is located directly below the <br /> (NPDES 001) West Return Ditch Monthly** continuous recorder and outfall of the 001 pond <br /> a sharp crested 90° <br /> v-notch weir <br /> SW-N6 Mid-West Monthly Monthly* None Flow is determined by current metering <br /> Return Ditch or by using a portable cut-throat flume. <br /> Volumetric weir <br /> CD • SW-N7 Upper West Monthly Monthly* Flow is determined using Manning's <br /> �. Return Ditch equation. Low flow is measured with a <br /> m bucket and stop watch. Volumetric weir <br /> a <br /> 0 <br /> r <br /> *Monthly field parameters (pH, temp., conductivity, and flow) only are collected and semiannually a full suite water quality sample is collected <br /> OD and analyzed. <br /> **Monitoring is done in compliance and in accordance with the Colorado NPDES Permit No. CO-0000213 for Nucla Mine. <br />