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Town of Primrose <br /> Old JG Bridge Replacement- 2016 <br /> Project Narrative <br /> The Old JG Bridge is located at the southwestern intersection of Old JG Road and <br /> County Highway JG in Mount Horeb, and crosses over an un-named tributary to the <br /> West Branch of the Sugar River. <br /> This project includes removal of the failed concrete abutments and bridge slab <br /> across Old JG Road,and installation of a 26-foot long, 7'6" diameter corrugated <br /> metal culvert pipe with flared ends. <br /> Construction will take place during a time of low-flow of the stream,and between <br /> July 15th and September 15th of 2016. Excavation will be limited to the area <br /> immediately around the bridge (being an area less than 1/10th of an acre),and <br /> existing soils and vegetation will be disturbed as little as possible. <br /> During construction silt fencing will retain run-off on sloped areas unprotected by <br /> natural vegetation. A silt curtain will be installed across the tributary to restrict <br /> downstream siltation. <br /> The removed bridge will be disposed of off-site. Any soil stockpiles will be used <br /> within 7 days, and any runoff to the waters of the State will be controlled. <br /> The CMP culvert installation will entail placement and compaction of clean granular <br /> fill,graded to meet existing ditch lines. Rip-rap will be utilized to stabilize slopes <br /> and stream flow where necessary. Class III Type C Turf Reinforcement Mat (TRM) <br /> will be placed in the stream channel down-stream from the culvert as needed to <br /> control erosion. Side slopes above and below the culvert will be protected with <br /> Erosion Control mat where possible, and with mulch where mat cannot be placed. <br /> Both matted and mulched areas will be seeded as per standard. <br />