The City previously retained Field Services Geology LLC to perform geomorphic evaluation of the Bear Brook stream corridor and develop designs for two in-stream habitat restoration sites. The contractor is expected to complete the in-stream habitat restoration work at each site as summarized below: Site 1 – 48” Storm Drain Outfall Channel Bank Restoration The open channel portion of Bear Brook begins at the outlet of a 48” RCP storm drain system. Immediately downstream of the storm drain outlet, the open channel banks are experiencing undercutting and sloughing. The approximate extent of channel instability is approximately 20’ in length and 5’ in width. A cross-country sanitary sewer interceptor main runs parallel to Bear Brook and is in close proximity to the area of channel instability. The proposed work of this site includes installation of woody debris and vertical timber piles in accordance with the details contained in Attachment A. The scope of work shall also include restoration and stabilization of disturbed areas. Site 2 – Culvert Crossing Removal and In-Stream Channel Restoration Approximately 20’ length of the open channel has been filled with a multi-barrel (four 12” diameter corrugated metal pipe) culvert crossing. The proposed work of this site is to remove the multi-barrel culvert pipe crossing and associated fill material and restore the open channel, including installation of woody debris material and timber log cribbing in accordance with the details contained in Attachment A. The scope of work shall also include restoration and stabilization of disturbed areas.
