Specifications include, but are not limited to: SLIDE REPAIR; (1) Maintain and Control Traffic; (2) Site Preparation and Erosion Control; (3) Excavation; (4) Furnish and install Drilled Railroad Rails; (5) Furnish and install wall cribbing; (6) Place geotextile fabric and backfill the cribbed railroads rails; (7) Reconstruct shoulders; (8) Remove guardrail and furnish and install new guardrail; (9) Staking; (10) Restoration and final dressing; and (11) All other work required by the contract.; Drilled Railroad Rails. See attached summary for site locations and estimated quantities of materials required. Contrary to the attached tables and drawings for drilled railroad rails, install only one (1) row of railroad rails on three (3) foot centers. The Department has not determined the depth to solid rock and the bidder must draw his own conclusions.; Install used railroad rail piling in drilled sockets in rock or stable material under the landslides (see Figure 1) or the eroded areas (see Figure 2) as project location dictates or as directed by the Engineer. Drill the socket and install the railroad rails into holes at slide locations. Drill sockets into solid rock, if possible. The Department will monitor each hole, which will serve as a sounding for the rail to be installed in it. Embed the railroad rail into solid rock no less than one-half the free end length of the rail (See figure 1 and figure 2). If solid rock cannot be obtained, the Engineer will determine the length of embedment required in other stable foundation. Allow adequate size of the drilled socket to allow free insertion of the railroad rail, but the maximum socket size is 1 foot in diameter.; Installation of Wall Cribbing. Crib any exposed portion of railroad rail before placing backfill. Install cribbing as shown on Figure 1 or Figure 2 and the typical section or as directed by the Engineer. Extend wall cribbing two (2) feet below the existing ground line or 12 feet below the proposed roadway elevation, whichever is deeper. If bedded rock is encountered, install the cribbing to the bedded rock only. Install wall cribbing on the railroad rail piling. Lap, bolt or weld, and attach cribbing solid to the drilled railroad rails. The Engineer may direct changes to these procedures.; Excavation and Backfill for Embankment Repair. Excavate each repair area as directed by the Engineer to provide a platform for drilling the used railroad rails; place cribbing and granular backfill; and excavation as necessary for slopes, ditches, shoulders, and drainage. Limit damage to or removal of the existing pavement. The Engineer may direct that the excavating equipment bucket size and width be adjusted to achieve the excavation minimizing damage to the pavement, utilities, drill steel, etc. After drilling, place geotextile fabric, and then backfill behind cribbed railroad rails. Construct backfill up to approximately four (4) inches below the existing pavement elevation. Place the backfill in lifts of two (2) feet or less in such a way as to limit settlement to the area and tamp with excavator bucket. Roll the final lift with excavation equipment to ensure the backfill is fully compacted. Do not pond water on the shoulder area or at the shoulder edge.; Restoration, Final Dressing, Seeding and Protection. Do not use excavated spoil material from the site as fill material. Warp and tie slopes into adjacent undisturbed slopes and ditches. Provide positive drainage upon completion of construction. Apply Final Dressing Class A to all disturbed earthen areas, both on and off the right-of-way. Sow with Seed Mixture No. 1.
