07/15/2004 Env Bd Packet - Laserfiche WebLink

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work through the use of chain saws, chippers, and bulldozers. Once the site has been cleared the grading would occur. Once the site has been graded, the installation of the sanitary sewer, watermain, and storm drainage would occur. Upon completion of the utilities all disturbed areas will be seeded and mulched. A crane will be used in the construction of the bridge and the hanging of utilities from the bridge. The last part of the work involves the installation of bituminous pavement. The bridge would be approximately 300 feet long with a paved driving surface 20 feet wide. All initial construction is expected to take 2 -3 months. Custom home sites will be constructed as each site is purchased by individual residents. The bridge as proposed would be supported by 150 foot steel trusses that would be assembled and placed on site. One pier is proposed in the center of the bridge to provide center support for the four 150 foot trusses. All equipment and materials would be brought in on trucks no longer than standard semi trailers (50 feet). The sections of the bridge will be delivered with five semi - trailer trucks. The 150 feet spans come in three pieces. They will be placed at the area where the new city cul -de -sac is proposed to be constructed on the west end of the project (north end of existing Ruffed Grouse Road). The spans will be bolted together in this area. The bridge will be supported on driven piles. The piles will be driven at each end abutment and at the center pier. The piles will be driven approximately 40 feet to 65 feet below present grade. The pilings for the two end abutments and the center pier are expected to take three days for construction. (Noise and vibration from the pile driving is addressed in Item 24.) The concrete will then be poured and allowed to set for one week. The bridge will then be constructed and is expected to take 10 days. If bridge construction occurs in summer months, a cabled wooden plank pad system is proposed to transport equipment across the wetland areas. These systems are typically used in wetland areas to minimize impacts on the wetland without the use of fill. Only tracked equipment and lighter weight equipment would be able to use this system. Therefore, the bridge would need to be in place prior to heavy equipment accessing the island property. The large 25' -30' planks are tied together with cables and large sections can be placed with a backhoe. Tracked pile driving equipment would be used to install the bridge piers. After the piers are in place the bridge would be installed from one end to the other wit a crane from the upland area for the first section and from the first bridge section to a second. If bridge construction occurs in the frozen winter months, equipment would be brought across on the ice. In either case, heavy trucks such as concrete trucks will not be able to access the island until the bridge is built. c. Explain the project purpose; if the project will be carried out by a governmental unit, explain the need for the project and identify its beneficiaries. • This project is proposed to provide eight single - family executive lots surrounded by natural wooded and wetland areas for the middle to higher range homebuyer market. Environmental Assessment Worksheet Page 3 Pheasant Hills 12`" Addition