Masalin Road Culvert Installation

Removal of a 48” +/- culvert and installation of a new 60 inch diameter culvert at an unnamed drainage way crossing under Masalin Road. The contractor shall be responsible for traffic control, to keep the road open, safe and passable for the public, and project signage. Traffic Control and signage shall be as specified in the most recent version of the Manual on Uniform Traffic Control Devices. Contractor provided signage must be in place before the start of construction and be maintained throughout construction activities. With appropriate signage in place and 48 hours notice to the Town, the contractor will be allowed to close one lane of the Masalin Road to traffic at the project site for up to one week. One lane of traffic is to remain open to traffic at all times throughout the duration of the project. 2. The contractor shall furnish all labor, equipment and materials necessary to prevent erosion and sedimentation from occurring on the construction site and areas disturbed by construction. Erosion and sedimentation control measures shall be in conformance with MaineDOT and Maine DEP Best Management Practices. The contractor shall provide erosion control measures as required for the construction activity whether or not they are specified in the contract documents. The contractor shall provide measures to comply with the applicable Best Management Practices. The contractor shall be responsible for providing erosion and sediment control during construction and for establishing permanent measures. The cost for all erosion and sediment control shall be included within the lump sum bid price. 3. The pipe for this project (one - 5’ diameter, 60 feet long HDPE in three sections) will be town supplied. The contractor shall be responsible for loading and transporting pipe from town storage location to the job site for installation and placement. The contractor shall coordinate the timing of these items in advance with the Lincolnville Public Facilities Director. All other labor, materials and supplies for this project are to be provided by the contractor. 4. The existing pipe shall become the property of contractor. The Contractor shall dispose of the pipe in a lawful manner. All excavated material shall become the property of the contractor. If suitable, excavated material may be re-used on site with approval of the Town except for the top twenty four inches of gravel backfill. 5. The contractor shall furnish all labor, materials (except the pipe) and equipment necessary to install the culverts. Care should be exercised in transporting and handling pipe to avoid damage. The pipe shall be installed in accordance with ASTM 2321 and ADS recommended installation guidelines and the manufacturer’s latest recommendations. The new culvert pipe shall be installed to the same line as the existing pipe. The culvert grade shall provide at least 28 inches from the top of the pipe to finished road surface. The inlet on the new pipe will be lower than the current inlet due to the upsize of pipe from 4’ to 5’and the outlet end shall be set at the current elevation. On the inlet end of the culvert twelve (12) feet +/- from the centerline and parallel to the road, the contractor shall install a new clay dam, see detail. The dam shall be a minimum of three feet wide and shall extend along the entire width of the excavation from 2’ below the invert to the springline. The pipe shall be bedded with crushed or screened gravel (1.5 inch minus) from 6” below the pipe to 6” above the pipe. The trench shall be excavated to the required grade and 6” of bedding installed and compacted. The pipe shall be installed on the bedding and the joints assembled in accordance with the recommendations of the pipe manufacturer. Bedding shall then be installed to the mid-point of the pipe. The bedding shall be worked and packed under the edges of the pipe with hand shovels and then it shall be compacted. Bedding material shall then be installed to 6” above the pipe and compacted. All compaction of bedding material shall be done with a vibrating plate compactor for the full trench width. Care shall be taken to prevent movement of the pipe during bedding installation, compaction and backfilling. From the top of the bedding to within 28 inches of the road surface the contractor may backfill with material excavated from the roadway (provided in it material suitable to the Town) or the contractor shall supply, install and compact MaineDOT TYPE D (4” minus) Base Gravel. From 28 inches of the finished road surface to within ten inches of the road surface the contractor shall supply, install and compact MaineDOT TYPE D (4” minus) Base Gravel. For the final ten inches of fill the contractor shall supply, install and compact MaineDOT TYPE A (2” minus) surface gravel. The width of the road at the top shall match the existing road shoulders. The side slopes shall be no less than 1.5:1 and shall match existing side slopes. 6. Tree or branch removal shall only be conducted with prior approval by the Public Facilities Director (or his designee). Proper disposal of wood and any stumps shall the responsibility of the contractor. 7. The contractor shall supply all labor, materials and equipment necessary to install rip-rap at all pipe inlets, outlets, ditch lines and backslope of ditch line. On both the inlet and outlet, rip-rap shall be installed a minimum of 5 feet on both sides of the culvert. On the inlet and outlet ends the rip-rap shall extend above and in front of the pipe as shown in the detail. Rip-rap shall be installed as soon as possible after the culvert have been installed. Rip-rap shall consist of sound, durable rock that will not disintegrate by exposure to water or weather. The stones shall be angular. Round, thin or flat stones will not be permitted. The maximum stone size shall be 18 inches and a minimum size of 6 inch. Rip-rap shall be placed on a contractor supplied non-woven erosion control geotextile fabric (Mirafi 160N or approved equal), see detail. The contractor shall excavate and grade the subgrade to the proper contour. Install geotextile fabric over the subgrade in accordance with manufacturer’s recommendations. The fabric shall be placed with the long dimension parallel to the road. Overlap joints 36” minimum. Stones should be placed full depth in one operation to provide a compact mass beginning at the bottom of the slope and proceeding upward. Rip-rap surface shall be placed approximately true to the required grade and shall be uniform in appearance. 8. Prior to paving, the contractor shall saw cut the remaining pavement edge straight across the road (perpendicular to the centerline). Project paving will consist of two compacted lifts. Contractor will be required to excavate 3.5 inches of gravel out of pipe trench, with no undermining of remaining pavement, prior to placing and compacting two lifts of pavement. The contractor shall tack the pavement edges prior to paving. The base course of pavement shall be MDOT 12.5mm mix compacted to a depth of 2 inches. In addition to the base course, the road will receive an additional course compacted to a 1.5- inch thickness of MDOT 12.5mm mix. Finished road grade to match existing road grade. Contractor shall be responsible for the condition of the gravel section until finished pavement is placed. 9. Disturbed areas not paved, gravel shoulder, or rip rap areas shall be loamed, seeded and mulched. Seeded areas shall be contractor maintained until adequate cover is established.

Division 31 -	Earthwork, Erosion and Sedimentation Controls.
Division 33 -	Utilities, Storm Drainage Utilities, Culverts, Ponds and Reservoirs.