260SUBDRAINS

DESCRIPTION

260.20: General

This work shall consist of constructing subdrains, using pipe, filter fabric and crushed stone filter material in accordance with the plans and these specifications and in close conformity with the lines and grades shown on the plans or established by the Engineer. MATERIALS

260.40: General

Materials shall meet the requirements specified in the following subsection of Division III, Materials: Perforated Corrugated Metal Pipe ........................................................................................ M5.03.1 Porous Concrete Pipe ................................................................................................................. M5.03.11 Crushed Stone ............................................................................................................................... M2.01.5 Slot Perforated Corrugated Plastic Pipe ............................................................................. M5.03.9 Geotextile Fabric for Subsurface Drainage ........................................................................ M9.50.0

260.60: Excavation (See 140.60: General )

The drain trench shall be excavated to the depth designated on the plans or, if directed, to a stratum of impervious material. Where no structure is to be placed at the ends of the subdrain pipe, the trench shall be excavated a distance of 3 ft beyond the end of the pipe. The excavation shall proceed in advance of the actual drain construction only to the extent the Engineer directs. The width of the trench for pipe of more than 12 in. in diameter shall be 1 ft greater than the nominal diameter of the pipe. The width of the trench for pipe 12 in . or less in diameter shall be 2 ft. Where rock is encountered in the excavation, no pa rt of any rock remaining in the trench shall come within 6 in . of any portion of the pipe. II.70 202 4 Edition 260.61: Laying Pipe Before any pipe is installed filter fabric shall be placed along the sides and bottom of the trench. The overlap between any adjoining pieces of fabric shall be at least 2 ft. Perforated subdrain pipe shall be laid with the perforations facing up.

260.62: Filling Drain Trench

The pipe shall be laid on a 2- in. bed of crushed stone and the space about, above, and in the 3 ft beyond the ends of the pipe shall be filled with 0.5 -in. or 0.75- in. crushed stone. The Contractor shall be responsible for keeping the backfill material clean and free of objectionable material from a line 1 in . below the flow line of the pipe to the top of the trench.

260.63: Protection of Inlets and Open Outlets

Inlets and open outlets of subdrains shall be covered with a #23 gauge galvanized wire screen of ¼ in. mesh satisfactorily fastened to the pipe. COMPENSATION .80: Method of Measurement Subdrain pipe shall be measured in place and the quantity to be paid for shall be the length of pipe actually constructed, plus an allowance of 3 ft for open ends. Trench excavation greater than a depth of 5 ft and rock excavation shall be measured as specified in

140.80: Method of Measurement for Class B Trench Excavation and Class B Rock Excavation ,

respectively.

260.81: Basis of Payment

Payment for the above work at the contract price per foot will include excavation, pipe, filter fabric, crushed stone and installation complete in place and satisfactory to the Engineer. Trench excavation greater than 5 ft in depth and rock excavation will be paid for as specified in 140.81: Basis of Payment for Class B Trench Excavation and Class B Rock Excavation , respectively .

260.82: Payment Items

*261.- -Inch Perforated Corrugated Metal Pipe ___ Gage (Subdrain) ................... Foot *265.- -Inch Pipe Subdrain – Option .................................................................................. Foot *266.- -Inch Porous Concrete Pipe (Subdrain) .............................................................. Foot *269.- -Inch Slot -Perforated Corrugated Plastic Pipe (Subdrain) ......................... Foot *Pipe size will be added to the item number and description. II.71 202 4 Edition SUBSECTION 270: PIPES REMOVED AND RELAID OR STACKED DESCRIPTION

270.20: General

This work shall consist of removing present pipes, plugging the ends and relaying or stacking them in accordance with these specifications and in close conformity with the lines and grades shown on the plans or established by the Engineer. MATERIALS

270.40: General

Material for Pipe Joints shall conform to the requirement of 230.40: General. CONSTRUCTION METHODS

270.60: Removal of Pipe

A trench of sufficient width and depth shall be excavated so that the present pipe can be removed without damage to the pipe. All joints shall then be opened and the pipe removed in its original sectional lengths. Existing pipe in good condition which is damaged in removing or other handling due to carelessness of the Contractor, shall be replaced with new pipe at the Contractor's expense.

270.61: Relaying

The construction methods for relaying the pipe in its final location shall conform to the requirements of 230.60: General to 230.63: Structural Plate Pipe and Pipe -Arch inclusive. In the case of corrugated metal pipe culverts, the Contractor shall furnish and place new collars and bolts and repair the coating of the pipe as directed.

270.62: Masonry Plugs for Pipe Ends

Masonry plugs shall consist of bricks and mortar to form a watertight seal at the end of the pipe being plugged. The thickness of the plug shall at least be equal to the inside diameter of the pipe being plugged.

270.63: Stacking

The Contractor shall accept and hold entire responsibility for the removal, handling, stacking at a location convenient for removal by the owner, and protection of all pipe until its final removal by others as designated and in accordance with the followin g: Any pipe lost or damaged through lack of protection or carelessness by the Contractor shall be replaced with satisfactory pipe at their expense. The Contractor's responsibility will cease upon final acceptance of the work or 60 days from the time a certified notice, with copy to Engineer, is sent by Contractor to owner of material that all material is available for removal. II.72 202 4 Edition 270.64: Backfilling Trenches The trench left by the removal of the pipes shall be backfilled in conformance with the relevant provisions of 150.64: Backfilling for Structures and Pipes . COMPENSATION

270.80: Method of Measurement

Pipes removed and relaid as directed will be measured in place after being relaid and quantity to be paid for shall be the length actually relaid. Any remaining pipe not required to be stacked shall become the property of the Contractor and shall be removed from the work without additional compensation. Masonry plugs for pipe ends shall be measured in place by the cross -sectional area of the inside of the pipe being plugged. Pipes removed and stacked, as directed, will be measured as the actual length of pipe removed and stacked in good condition. Trench excavation greater than a depth of 5 ft and rock excavation will be measured as specified in

148.80: Method of Measurement for Class B Trench Excavation and Class B Rock Excavation,

respectively.

270.81: Basis of Payment

Pipes removed and relaid will be paid for at the contract unit price per foot of the kind of pipe required to be removed and relaid, installed and complete in place. Masonry plugs will be paid for at the contract unit price per square yard complete in place. Pipes removed and stacked will be paid for at the contract unit price per foot of the kind of pipe required to be removed and stacked. Field Stone Masonry in Cement Mortar and 3, 000 psi, 1.5 -inch , 470 Cement Concrete will be paid for at the contract unit price per cubic yard. Trench excavation for both removing and relaying greater than a depth of 5 ft and rock excavation for relaying will be paid for as specified in 140.81: Basis of Payment for Class B Trench Excavation and Class B Rock Excavation. Backfill for trenches 5 ft or less in depth shall be included in the various items of pipe. Backfill for that part of a trench which is more than 5 ft in depth shall be included in the item for Class B Trench Excavation. If borrow material is used for backfilling, it will be paid for at the contract price per cubic yard of the kind of borrow required. II.73 202 4 Edition 270.82: Payment Items

227.4Masonry Plug ................................................................................................................. Square Foot

*270. Pipe Removed and Relaid ......................................................................................... Foot *271. Pipe Removed and Stacked ...................................................................................... Foot *Pipe or appurtenance size will be included as part of the item number in order to differentiate between the sizes. SUB