• Remove existing twin 24” diameter CMP/HDPE culverts with a new 6’ (rise) x 16’ (span) x 73’ (length) concrete box culvert and gabion basket walls and riprap embankments in accordance with the US Army Corps of Engineers permit (USACE) in Appendix B. • Provide bypassing, dewatering, and erosion control measures during construction in accordance with Maine DEP BMP manual and USACE permit in Appendix B. • Support and protect existing 12” high pressure steel gas main. The contractor shall submit a utility protection plan to Unitil for approval prior to the start of construction. • Reconstruct approximately 150’ of River Road. Grind butt joints as needed. Repair lawn areas as necessary with loam, seed, and mulch. • Remove and replace approximately 290’ of guardrail with flared terminal ends. • River Road may be closed to traffic for no more than 12 continuous calendar days. The closure shall start on a Monday and end on a Friday.
