Kellogg Ltr 10-9-01 - Site plan review/L.O.C schedula

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• 4. Utilities:The proposed sanitary sewer flows from the site are to be routed to the existing lift station near the southwest corner of the existing pond.There isn't enough capacity at this lift station to accommodate flows from the fully developed site. MnDOT's plans to upgrade T.H. 12 include downstream sanitary sewer improvements and elimination of this existing lift station.Capacity will no longer be an issue once the sanitary sewer improvements are completed downstream and the existing lift station is off line. Current MnDOT plans indicate sanitary sewer improvements will begin within the next year. Until the T.H. 12 sewer improvements are constructed,the number of sewer units allowed to discharge into the existing lift station should be monitored closely.The relocation of the existing sanitary sewer north and west of the pond should include removal of the existing pipe and structures.A sanitary manhole should be added where the service to the senior housing apartment connects to the relocated sanitary sewer.The grade of the sanitary service from the senior housing building stated on the plans does not agree with the inverts provided. It appears the 11+/- % grade shown on the plans should be revised. Sanitary connections to existing manholes shall be core drilled with a rubber boot installed.Gate valves should be added to the water main at both connect to existing water main locations, both water services to the buildings,on the 8-inch main east of the service to the office complex and at the stub west of the office. The stub west of the office should be extended another 100-feet to the north so it is outside of the paved parking area. A temporary hydrant should be installed at the end of this stub for flushing and water quality purposes.The proposed water main loop should be constructed as part of Phase Ito improve fire flows and water quality.The 6-inch sanitary sewer from Wayzata Boulevard should be constructed as part of Phase 1. 5. Easements: Utility easements will need to be provided for all water main, sanitary and storm sewer. Drainage easements should be provided across any existing or proposed drainage ways. A final plat should be submitted for review. 6. Financial Guarantee: We have estimated the total cost for Phase 1 site improvements to be$307,605. The amount of the financial guarantee provided to the City should be 150%of that amount or$461,408. The itemized cost estimate for Phase 1 improvements is attached.When Phase 2 plans are finalized we will prepare an estimated cost for site improvements to determine the financial guarantee for that work. Please contact me at(651) 604-4863 if you have any questions regarding this matter. Yours very truly, BONESTROO,ROSENE,ANDERLIK&ASSOCIATES,INC. Tom Kellogg cc: Greg Gappa, City of Orono