8.2. SR 11-17-2014 - Laserfiche WebLink

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Ms. Suzanne Fischer January 15,2014 Page 3 ® American Legion and Rail Road Pond • SRV values ranged from 7.8 to 24.2 • Sediment within the pond consisted primarily of sand • Excavated sediment should be considered a SRV Level 3 • Soils with a SRV Level 3 or higher must be disposed of at an MPCA approved landfill Pond Survey Findings • Orono Lake(Dam) Pond Survey data and field observations indicate that the remaining effective treatment capacity for this pond is 47.8%. There are significant sediment deltas on the westerly portion of the pond, consisting mostly of sand. Water depths range from 0.3 feet to 4.1 feet. Sediment depths range from 2.5 feet to 6 feet. • Highland and Jackson Pond Survey data and field observations indicate that the remaining effective treatment capacity for this pond is 25%. There are considerable amounts of sediment but there is a consistent water depth within the pond. Sediment within the pond consists mostly of sand. Water depths range from 2 feet to 3.2 feet. Sediment depths range from 1 foot to 4 feet. • McDonalds and Highway 169 Pond Survey data and field observations indicate that the remaining effective treatment capacity for this pond is 75%. There are significant sediment deltas throughout the pond and the easterly edge is completely filled in with sediment. Sediment within the pond consists mostly of sand. Water depths range from 2.6 feet to 6 feet. Sediment depths range from 3.6 feet to 6.9 feet. • American Legion and Rail Road Pond Survey data and field observations indicate that the remaining effective treatment capacity for this pond is 7.5%. This pond is completely filled in with sediment. There is a silt curtain present at the easterly and westerly ends of the pond that were not removed after reconstruction of the adjacent streets. Water depths range from 0.2 feet to 2 feet. Sediment depths range from 0.2 feet to 2 feet. RECOMMENDATIONS The Orono Lake,Highland, and American Legion Ponds are at their limit of treatment effectiveness and it is recommended that they be maintained if funding is available. The McDonalds Pond was observed to have a considerable amount of acuminated sediment but still has a uniform water depth that provides a reasonable amount of treatment. The McDonalds and American Legion Ponds both have a Level 3 or greater SRV level and the excavated material will be required to be disposed of in an MPCA approved landfill. The Orono and Highland Ponds both a Level 2 SRV and this material may be used in commercial or industrial areas. Based on these results, if funding and a disposal site is available, it is recommended that the Highland Pond be maintained by removing approximately 800 cubic yards of material to obtain a uniform depth of four feet,which will provide an adequate treatment for the watershed. If additional funds are available, the Orono Pond could be maintained. However,this pond has K:101992-OY,Admin'Jl.,\J 1993-0G_rc,hM�.,oJwnd 010914_d-