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• difficult to survey and obtain a high degree of accuracy. In 1993, Seneca adopted a new approach to sediment <br />surveys. That is, concentrating the survey shots in an azea where the most sediment deposition is likely to occur. <br />Based on the ]993 survey, all sediment ponds have sufficient sediment storage. Additionally, all ponds have been <br />discharging in compliance with the approved NPDES permit effluent limitations. Yeazly sediment delivery estimates <br />to the ponds are considerably less than originally calculated, especially since the majority of the areas in these <br />watersheds have now been reclaimed and revegetated. <br />The following data shows the latest calculated annual sediment delivery and existing capacity. <br />Sediment Survey Results <br />Pond Year Surveyed C~aciri (ac-ft) AvR. Yearly Sedimenl (ac-ft) <br />002 1993 186.26 O.IS <br />003 1993 5.06 0.003 <br />004 1993 8.28 0.12 <br /> <br />008 1993 6.99 0.05 <br />From the past history of sediment delivery to all of these ponds there should still be more than adequate sediment <br />storage available. SCC did survey ponds 004 and 008 in 1998, but was unable [o locate the previous survey <br />information. Based on the information provided above, SCC recommends the next sediment surveys be conducted in <br />2002 for all four sedimentation ponds and a complete evaluation can then be conducted. SCC plans to clean any <br />ponds that this survey determines to be at of neaz sediment capacity. <br />Stock Tanks <br />SCC is requved by Permit C-80-005, Volume 12, Tab l3, Appendix 13-9 (from TR-21) to provide as-built drawings <br />for all temporary stock tanks that were constructed in the previous year. No new stock tanks were constructed during <br />the 2001 season. <br />i <br />6 <br />