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No Intermediate Metallic Conduit (IMC) or thin-wall indoor -type electrical conduit shalt be permitted on this project. 3.1.4 'Underground Conduit Installation Type of conduit shall be TC6-PVC and shall be 2" or 4" with three (3) 1 1/4" innerducts where specified in the plans. The top of the conduit shall be not less than 24 inches below grade, and shall have a minimum slope of 3 inches in each 100 feet away from buildings and toward manholes and other necessary drainage points. Run conduit in straight lines except' where a change of direction is necessary.. Grade bottom of trench smooth; where rock, soft spots, or sharp - edged materials are encountered, excavate the bottom for an additional 3 inches, fill and tamp level with original bottom with sand or earth free from particles, that would be retained on a 1/4 -inch sieve. Provide color, type and depth of the detectable warning tape, Thor "Terra" tape or approved equal, as specified with label "WARNING - BURIED FIBER OPTIC CABLE - WARNING ". Except at conduit risers, accomplish changes in direction of runs exceeding a total of 90 degrees, either vertical or horizontal, by long sweep bends having a minimum radius of curvature of 10 feet; Manufactured bends shall have a minimum radius of 24 inches for use with conduits of less than 3 inches in diameter and a minimum radius of 36 inches for ducts of 3 inches in diameter and larger. Excavate trenches along straight lines from structure to structure before ducts are laid or structure constructed so the elevation can be adjusted, if necessary, to avoid unseen obstruction. 3.1.5 Direct Bury Construction Bury cables directly in earth as shown on the plans, except under railroad tracks, paved areas, and roadways, and where specified to install cables in conduit. Utilize the "plow" method of cable placement to direct bury the fiber cable and a detectable tape. Excavate to a depth that allows a minimum cable cover of 30 inches to the top of the cables. Trenches shall be in straight lines. Bends in trenches shall have a radius of not less than 36 inches. When rock is encountered, remove to a depth of at least 3 inches below the cable and fill the space with sand or clean earth free from particles larger than U4 inch. Replace sod which has been removed, as soon as possible after backfilling is completed. Restore areas disturbed by trenching, storing of dirt, cable ilaying, pad construction, and other work to original condition and maintain until final acceptance. Provide necessary topsoiling, fertilizing, liming, seeding, sodding, sprigging or mulching.