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SEDIMENT STORAGE CAPACITY <br />1. Design specifintions and field measurements: <br />PARAMETER VOLUME (acre feet)' ELEVATION <br />Principle spillway 2.67 7,071.8' <br />100% sediment storage (3 Year <br />Sediment Volume) 1.44 7,070.0' <br />Water level in pond 7,069.3' <br />60% sediment storage 0.86 7,069.0= <br />Bottom of pond 7,067.5' <br />' design <br />Z field measurement <br />I. Has the design sediment storage capacity o[ the reservoir been surpassed? Yes _ No X . If yes, <br />explain. <br />There was evidence of recent excavation (removal of sediments) activity. The accumulation of sediment <br />had been partially removed. The apex of the remaining materials was estimated to be sit an elevation of <br />7071.5, and the remaining deposit appeared to extend approximately half way across the pond to the south, <br />and approximately 3/4 the length. Thus approximately 40% of the design 60% sediment storage capacity <br />is filled. <br />OTHER OBSERVATIONS: <br />1. Threat to human life or property: slight to none except to the structure itself. Maximum design capacity <br />of [he pond is approximately 3.93 acre feet. The region below the structure is a Ooodpl:3in terrace of the <br />Purgatoire River with no development. <br />2. Potential harm to land, air, and water resources: Water quality of the Purgatoire River could be affected <br />by release of approximately 4 acre feet of turbid runoff water and embankment materials For a short period <br />of time should the pond embankment Fail following a large precipita[ion event. <br />MAINTENANCE REQUIRED <br />1. None. <br />SUPPORTING DOCUMENTATION (Compaction tests, surveys, ohotoeraohs, other measurements) <br />1. None other than referenced above. <br />Inspector e <br />i 8 ~,~./ (Q 4 t/ <br />Date <br />~~ w~c /~' 2r/al~•~ <br />Byro G. Walker, Colorado 18378 <br />Inspecting P.E. <br />Send to: Colorado Division of Minerals S Geology J4.05.6(13)J. <br />Golden Eagle Mine Sedimentation Pond 004, 31 March 94, Page 7 0l 3 Pages <br />