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• Sedimentation Pond 003. Design information and calculations for this pond were submitted <br />in the Seneca II Permit Renewal Application (August 27, 1986) and subsequently approved by <br />CMLRD. On September 8, 1986, Sedimentation Pond 003 was resurveyed as part of Seneca's <br />1986 annual sediment survey. The survey information was used to develop a <br />computer-generated contour map. This data was then used to calculate the remaining <br />sediment storage beneath the principal spillway. The following table shows a comparison <br />of the 1985 and the September 6, 1986 volume calculations. <br />1985 September 8, 1986 <br />Capacity Cumulative Capacity Capacity Cumulative Capacity <br />Elevation (AC-Ft) (Ac-Ft) (Ac-Ft) (Ac-Ft) <br />6566.0 <br />-- -- 0.27 0.27 <br />6568.0 <br />6570.0 <br />0.59 0.59 0.68 0.95 <br />0.94 1.53 0.94 1.89 <br />• 5577._0 <br />1.20 2.73 1.20 3.09 <br />6574.0 <br />6576.0 <br />6577.1 <br />6578.0 <br />6580.0 <br />46 4.19 1.46 4.55 <br />0.94 5.13 0.94 5.49 <br />0,84 5.97 0.64 6.33 <br />7,99 2.02 8.35 <br />At the principal spillway elevation of 6577.10, the 1985 sediment storage capacity was <br />5.13 ac-f t; whereas the September 8, 1986 sediment survey indicates a sediment storage <br />volume of 5.49 ac-f t. The difference in sediment storage of +0.36 ac-ft is primarily the <br />result of several survey shots being taken at locations in the pondi ng area that were <br />lower than the survey shots taken in 1985: This is indicative of the survey methods which <br />• <br />7-11A-Z <br />