Specifications include, but are not limited to:Contractor shall furnish all: labor, equipment, and materials to perform work in strict accordance with all SHA specifications and all Environmental Procedures for the project. The following must be removed from the intersection of MD 329 “Royal Oak Rd” and Thorneton Rd no later than the project completion date: Any soil or organic spoils and debris, all steel, concrete, and wood or other construction materials, equipment, and vehicles. Work accomplished shall meet or exceed the specifications designated by the SHA Project Engineer. The current roadway and any grass will be repaired back to normal operating conditions to match existing roadway surface after pipe(s) and structure(s) are replaced. à Work to accomplish includes the following items. The contractor is responsible for verifying all measurements and scope prior to bidding and will use them for cost estimates and construction. 1. Install Erosion and Sediment Control Measures and Dewatering Operations The culvert is located within the Effective FEMA Floodplain and ultimately outlets to a tidally influenced body of water and therefore can backwater during high tide and storm events. All work should be performed within a 3-day dry weather forecast. Extra precautions shall be taken to ensure no sediment laden water leaves the project area. The upstream end of the cross pipe under MD 329 shall be temporarily blocked to ensure backwater from the downstream water body does not enter the work site during tidal changes and storm events. All dewatering processes shall follow MDE’s current Standards and Specifications for Soil Erosion and Sediment Control. All disturbed areas shall be stabilized at the end of each workday. Upon final inspection and with approval all erosion and sediment control and dewatering practices can be removed once all proposed work is complete, and all areas stabilized. 2. Replace failed culvert at (38°44'36.82"N 76°10'48.16"W): The culvert replacement in this section involves the removal of the existing pipe culvert and replacement with a 13” X 17” X 50ft metal culvert that ties into a concrete drainage box using the following criteria: • Existing culvert will be excavated and removed ensuring any structures attached to the existing culvert are not negatively impacted by the culvert removal. • In preparation for the new culvert emplacement, re-grade the earth and gravel base under the culvert, adding material as needed, to achieve a positive slope for drainage with a laser level transit. • Emplace a new culvert with length adequate to receive and discharge water from logical points on either side of the roadway depending on bank slopes. • When emplacing the new culvert into the concrete drainage box reform with new concrete and seal the voids around the new culvert so there are no gaps and connection is watertight. • Backfill a minimum of ½ pipe diameter or 12”, whichever is greater, on top of culvert crown with crush in run stone. Place stone in 2” loose lifts and compact with a motorized jumping jack. After 4” of cover has been obtained, a mechanical, walk-behind tamper may be used. Place MDOT approved back fill from the top of the crush and run above the pipe to the subbase (6” below finished grade) of ground level in 4” lifts, compacting each lift. • After stone has been compacted to the specified finished grade (6” below the ground height) add 6” of screened topsoil compacted in 2” lifts. • After compacting 6” of screened topsoil rake to loosen the material. • Apply approved grass seed mix to the exposed topsoil areas and apply straw curlex matting and pin into the ground with sod staples for stabilization and adhering to all Erosion and Sediment guidelines (COMAR 26.17.01.10)
