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 plan s 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 responsible for replacing or repairing the settlement plate(s) to the satisfaction of the Engineer at no additional cost to the State.

207.03.2 Monitoring. Monitoring of the settlement plate(s) will be done weekly

commencing immediately after each settlement pl ate is set and shall continue until a 180- day waiting period is completed. The 180-day waiting period does not begin until the surcharge construction is complete. The data shall be reported weekly to the Project Engineer for review. The data from the se ttlement plate(s) shall be forward to the Geotechnical Engineer, w ith copies to the Project Engineer , every 30 days for evaluation. Monitoring shall be performed from an esta blished survey location outside the limits of anticipated settlement.

207.04 Method of Measurement. Settlement plate, complete and accepted, will be

measured per each. No separate payment will be made for maintain ing, monitoring or reporting the settlement plate(s) data for the 180-day waiting period. Cost associated with maintaining, monitoring, and reporting se ttlement plate(s) data shall be included in the cost of the settlement plate. 207.05--Basis of Payment. Settlement plate, measured as prescribed above, will be paid for at the contract unit price per each, whic h shall be full compensation for furnishing labor, materials, equipment and services necessary to install, maintain, and monitor each settlement plate. Payment will be made under: 207-A: Settlement Plate - per each SECTION 209 - GEOTEXTILE STABILIZATION

209.01 Description. This work consists of furnishing and installing geotextile for

stabilization of embankments and subgrades as shown in the plans and in conformance with these specifications.

209.02 Materials . The geotextile and incidental materials for this work shall meet the

requirements of Subsection 714.13.

209.03 Construction Requirements . A subgrade that is to receive geotextile shall be

shaped and compacted to a smooth finish and free of loose material and sharp objects. An embankment site shall be cleared and grad ed to establish a relatively smooth surface. Trees and stumps are to be cut off at ground line and sawdust or sand placed over these areas to provide a cushion for the geotextile. The geotextile shall be placed as smooth as pos sible and free from tens ion, stress, folds, wrinkles or creases. Where more than one layer of geotextile is required, all joints of the bottom layer shall be sewn to develop the required geotextile strength perpendicular to the joint. The top layer and single layer installations of geotextile may be overlapped a minimum of two feet at each joint or sewn.