207Settlement Plate

207.01 Description. This work consists of furnishing all labor, materials, equipment,

and services necessary to install, protect, maintain, and monitor settlement plate(s) in order to determine and report total embankment settlement. Monitoring shall consist of the surveyed elevation of the top of the vertical interior standpipe at monitoring and reporting increments determined by the rate of embankment construction and/or the time increment specified on the site specific construction plans and guidelines, as compared to the initial baseline survey to determine the total recorded settlement.

207.02 Materials. The required material lengths and quantities are the responsibility of

the Contractor based on the embankment total height, plus surcharge height, if required, plus stick-up. The Contractor shall be responsible for verification of ground line at the time of construction and adjustment of quantities, as needed.

207.02.1 1-Inch Diameter Steel Pipe and Couplings. Pipe shall be 1-inch diameter,

ASTM A53, Schedule 40, black, threaded end, steel pipe with compatible steel couplings.

207.02.2 2-Inch Diameter Steel Pipe and Couplings. Pipe shall be 2-inch diameter,

ASTM A53, Schedule 40, black, threaded end, steel pipe with compatible steel couplings.

207.02.3 Steel Plate. The steel plate shall be a minimum ½-inch thick by 2-foot by 2-

foot ASTM A53, steel plate.

207.03 Construction Requirements.

207.03.1 Installation. The settlement plate(s) shall be assembled and placed at the

locations shown in the plans or as directed by the Engineer. Each settlement plate shall be placed on a level ground surface at or near the existing ground surface, subsequent to stripping, clearing and grubbing operations in preparation for embankment construction. Field weld-all-around a 1-inch threaded coupli ng to center of steel plate using a ¼-inch single bevel weld. Sections of the 1-inch and 2-inch steel pipe shall be added incrementally as the fill height is increased to maintain a 2-foot to 4-foot extension of the steel pipe above the embankment fill level at all times. The 1-inch diameter steel pipe shall be centered within the 2-inch diameter pipe to prevent any interference of movement between the two pipe sections and extend vertically at least 6-inches (or the estimated design settlement depth) above the 2-inch pipe. The 2-inch diameter steel pipe shall begin at an elevation approximately six inches (6”) above the elevation of the steel plate. In the event that damage to the settlement plate(s) occurs as the result of the Contractor’s operations and it is deemed by the Engineer to be unusable, the Contractor will be