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<br /> <br />Pond A Implementation Plan <br />As required by NOV # C-93-080, CYCC is submitting the following <br />plan to prevent a recurrence of the matter resulting in issuance of <br />the referenced violation. <br />As previously discussed, the required volume to treat and convey <br />the 10 year - 24 hour event places the initial water level at an <br />elevation of 6936.1 feet, which corresponds to a point above full- <br />flow on the second set of holes in the riser. To prevent a <br />recurrence of the elevated water levels during spring run-off, CYCC <br />proposes the utilization of the existing sluice-gate structure to <br />maintain the water level at approximately the top of the second set <br />of holes, with adjustment of the sluice-gate to take place in <br />conjunction with the weekly impoundment inspection for this point. <br />Given that the sluice-gate is constructed in such a manner that the <br />discharge exits the riser in a normal fashion, no modification of <br />the approved NPDES monitoring point is required. Per CYCC's <br />conversation with Ms. Pat Nelson of the Department of Health, <br />supplemental sampling of the discharge should not be required if <br />the sluice-gate is to be open for an extended period of time where <br />the normal sampling schedule requirements allow representative <br />samples to be collected. Flow rates would continue to be monitored <br />utilizing the existing flume, and samples would be collected at the <br />currently approved compliance point. <br />Please note that the use and adjustment of the sluice-gate would <br />only be in conjunction with base-flow fluctuations, and would not <br />entail the adjustment of the sluice-gate in conjunction with <br />precipitation events. During periods when the base-flow component <br />can be routed by the riser orifices, the sluice-gate will be kept <br />closed and locked. <br />9~ <br />~~~a~ <br />