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• Mr. Archer <br />10 July 90 <br />Page 3 <br />E. The outlet pipe is 1.5 feet in diameter and 43.5 <br />feet in length. <br />The embankment areas around the pond are vegetated and show no evidence <br />of erosion related to pond overflow, Outflow from the drainage pipe <br />falls on one to two foot boulder rip-rap. Input pipes are free and <br />clear of debris and functioning properly. <br />• The Yampa Sedimentation Pond Design involves a drainage area of 1.29 <br />acres with maximum 24 hour storm precipitation of 1.6 inches for 10 <br />years, 2.0 inches for 25 years and 2,6 inches for 100 years. The design <br />Peak Flow for the 100 year maximum 24 hour precipitation event is 3.2 <br />cfs, and the 5.5 cfs capability of the functioning 1.5 foot diameter <br />dewatering device is more than adequate. The design Total Flow for the <br />10 year maximum 24 hour precipitation event is 0.04 acft and an <br />additional 0.01 acft was designated for sediment storage. The <br />functioning total pond volume of 0,537 acft is 974 percent larger than <br />design requirements. <br />The Yampa Sedimentation Pond storage area and dewatering device are more <br />than adequate to control runoff and sedimentation from the 1.29 acres <br />encompassing the conveyor, crusher and access road areas. <br />Respectfully submitted, <br />Ey~ge e M. Shearer, P.E. <br />Ido9 ulting Geologist <br />l/E/MS:mjs <br />Enc. <br />' , \, <br />