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COMMENTARY ON SHEET 4 ESTIMATED CONSTRUCTION COST A grass-lined channel with sections of structural wall channel at constric- tions would be utilized in this reach and the pond at First Avenue and Balsam Streets would be upgraded to provide maximum detention storage. Item Extend 48" Reinforced Concrete Pipe (RCP) and add 6' x 4' Reinforced Concrete Box (RCB) at 1st Avenue The grass-lined channel would start below the Rockmont Pond spillway and would follow the existing channel thalweg to connect to the recently con- structed 100-year channel near the intersection of Balsam Street and Bayaud Avenue. Sections of structural wall channel and new reinforced concrete box culverts would be constructed at Cody Court, Cody Street, Carr Street, and Brentwood Street. Ba 1 sam Pond Structural Walled Channel Brentwood Street to Cody Street Grass Lined Channel Cody Street to upstream of Cody Cou rt 10' X 4' RCB at Brentwood Street Upgrading of the pond at First Avenue would provide a minimum of 10 acre- feet of detention storage. Improvements would include excavation and re- grading of the pond area to maximize site utilization, while allowing the area to be developed into a public park. 10' X 4' RCB at Carr Street 8' X 4' RCB at Cody Street 6' x 4' RCB at Cody Court 2 Drop Structures All improvements would be designed to accommodate the 100-year event. Utility Relocation The outlet capacity from the pond would be increased to accommodate the 100-year discharge by adding a headwall to the existing 48-inch pipe and by the addition of a parallel 6-foot by 4-foot reinforced concrete box culvert. C lean- up TOTAL CONSTRUCTION COSTS Engineering and Contingencies (25% Construction Fiscal, Legal and Administrative (8% of Total Above) If the pond is enlarged before the downstream conduit is installed, additional pond outlet modifications may be desirable, such modifications would reduce the peak flow during very frequent storms. Overflow capacity sufficient to fill the existing 48-inch pipe and the proposed box pipe would be provided at such an outlet. Cost estimates do not include such outlet modifications since they would be temporary until the larger pipes are installed downstream. Land Acquisition Costs TOTAL COST Annual Maintenance Cost The 100-year floodplain is to be regulated and it is recommended that the residents within the adjacent to the 100-year floodplain be notified annually of the potential flood hazards. Cost I I I I I I I I I I I I I I I I I I I $ 80,900 $ 24;000 $ 74;000 $ 12,000 $ 15,000 $ 30,000 $ 15,000 $ 14;000 $ 10,000 $ 17,000 $ 2,000 $293,900 Costs)$ 80,000 $ 32,000 $ 80,000 $485,900 $ 900