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~~ <br />A treatment facility will be installed to meet the applicable <br />discharge requirements. Pond designs are shown on Drawing IV-55. <br />4.3.5 Hydrologic Monitoring Plan <br />Empire Energy has set forth below a plan for collection <br />and recording hydrologic data for the long-term assessment of the <br />hydrologic character. More specifically, surface waters will be <br />monitored at all discharge points for the sediment control <br />structures and recorded on a daily and weekly basis during <br />periods of excessive runoffs or during spring melt. These loca- <br />tions are shown on Map IV-9. Also, during the latter part of the <br />year when thunderstorms meeting the 10-year, 29-hour event or " <br />greater may occur, discharges will be monitored and recorded in <br />accordance with this plan. Surface water will be monitored for <br />quality and quantity. <br />This plan for recording will be as necessary from all <br />NPDES discharge points from sediment ponds and in accordance with <br />all times and dates of discharges. These discharges will be <br />analyzed for the constituents required on the NPDES discharge <br />permits. <br />Four stream monitoring locations have been designated <br />as locations R1 - R4 on Map IV-13, which will be used to evaluate <br />the Yampa and Williams Fork Rivers. Empire has installed a <br />stream flow monitoring station on the Williams Fork River at the <br />main haulroad bridge. Flow will be estimated on the Yampa from <br />the U.S.G.S. monitoring stations. The following table indicates <br />1 ' the testing schedule: <br />IV-71 Re~{ised 05/16/80 <br />I I~ <br />