758The mixture for HMA for underdrains shall be Intermediate OG19.0 mm in 30

718.03 Pipe Installation

718.05 Underd rain Outlets

If the underdrain pipe and the outlet pipe are of different sizes, an increaser of the same material as the outlet pipe shall be installed 2 ft from the 45° elbow and prior to the transition pipe. If a single outlet pipe is to be skewed at 45°, a second 45° elbow and an elbow-connector pipe are not required. 718.03 The outlet pipe or pipes shall be located as close as possible to the center of the outlet protector. After the outlet pipe installation, the trench shall be backfilled as shown on the 80 plans. Structure backfill sha ll not extend into the limits of the underdrain trench. The trench outside the limits of structure backfill shall be filled with materials suitable for growing vegetation. Aggregate and stabilized materials removed from an existing shoulder shall not be used as backfill and shall be disposed of in accordance with

206.07 At the time of installation, a rodent screen shall be placed on the outlet pipe or

the ends of the underdrain pipe when located in inlets or catch basins. 718.06 Underdrain Outlet Protectors Underdrain outlet protectors shall be constructed as shown on the plans.

718.07 Video Inspection Underdrains and outlets shall be inspected using high resolution, high sensitivity, waterproof color video cam era/recording equipment.

The camera/recording equipment shall be specifically designed for continuous viewing/recording of detailed images of the interior wall of pipes and transitions of the specified sizes. The equipment shall have the capability of viewing a minimum of 450 ft into the pipes and shall be designed to include sufficient lighting to view the entire periphery of the pipe. The equipment shall have appropriate attachments to maintain a position in the center of the pipe and an electronic counter to continuously 100 record the location of the equipment in the pipe. The recording equipment shall record video of a quality and in a format acceptable to the Engineer. A color video printer shall be included in the equipment for printing observations during inspection. The Engineer will determine the runs of the underdrain installations to be inspected. Video inspection shall be conducted after guardrail, lighting, sign installation, and final seeding or sodding operations are completed. Damage discovered by the video inspec tion shall be repaired. Damage shall include but is not limited to: 110

718.08 Patching Underdrains

Underdrains that are disturbed shall be repaired such that the underdrain is perpetuated. This repair shall include the construction of new outlets where the existing configuration prior to the damage cannot be reinstalled. The repairs shall be as approved by the Department. Once the repairs are completed, a video inspection may be required by the Department to veri fy that the repairs have been successfully completed. Geocomposite edge drains that are disturbed shall be outletted as approved and not perpetuated. 718.09 Method of Measurement Underdrain and outlet pipe will be measured by the linear foot, complete in place. If the pipe connects to structures such as manholes, inlets, or catch basins, the pipe will be field measured to the outside face of the structures. Outlet protectors will be measured by the number and type of units installed. Measurement of outlet pipe will be made along the centerline of the pipe from the 140 point of connection with the underdrain pipe to the downstream end of the outlet pipe and will include all transitions, elbows, and increaser or decreaser connections. Structure backfill will be measured in accordance with 211.09. HMA for underdrains will be measured by the ton. Aggregate for underdrains and underdrain s for MSE walls will be measured by the cubic yard, complete in place. The pay limits will not extend beyond the neat lines shown on the plans. 150 Geotextiles for underdrains will be measured by the square yard, for the type specified, based on the neat line limits shown on the plans. Video inspections for underdrains will be measured by the linear foot as determined by the electronic equipment. Patching of underdrains will not be measured. Rodent screens and other incidentals will not be measured for payment. Concrete, reinforcing bars, or sod for underdrain outlet protectors will not be measured for payment.

718.10 Basis of Payment

The accepted quantities of underdrains and underdrain outlet pipe will be paid for in accordance with 715.14. Aggregate for unde rdrains will be paid for at the contract 718.08 761 unit price per cubic yard. Underdrains for MSE walls will be paid for as aggregate for underdrains. Geotextile for underdrains will be paid for at the contract unit price per square 170 yard for the type specified. Outlet protectors will be paid for at the contract unit price per each of the type of unit installed, complete in place. The accepted quantities of HMA for underdrains will be paid for at the contract unit price per ton. Underdrain patching for structure installation will be paid for at the contract unit price per linear foot of underdrain, patching and shall be equal to the length of the theoretical pavement replacement as shown on the plans. Structure backfill will be paid for in accordance with 211.10. 180 The final accepted quantity video inspectio n for underdrain will be paid for at the contract unit price per linear foot. Payment will be made under: Pay Item Pay Unit Symbol Aggregate for Underdrains ........................................................ CYS Geotextile for Underdrains, ______ .......................................... SYS type 190 HMA for Underdrains ............................................................... TON Outlet Protector, ____ ............................................................... EACH type Underdrain, Patching ................................................................. LFT Video Inspection for Underdrain ............................................... LFT Geotextile for underdrains which has been rejected due to contamination or other reasons shall be replaced with no additional payment. The cost of excavation, forming, reinforcing bars, concrete, curing materials, and 200 sod shall be included in the cost of outlet protector. The cost of providing the video inspection equipment, technician, and a copy of the video inspection shall be included in the cost of the underdrain video inspection. The cost of repair of underdrain pipes, aggregates, backfill, outlet protectors, geotextile fabric, providing video re-inspectio n of the repairs, and other incidentals shall be included in the cost of the other pay items in this section. Where underdrain repair for structure installation is required, the cost of underdrain pipe, aggregate for underdrain s, geotextile for underdrains, HMA for 210 underdrains, outlet protectors if required, video inspection for underdrains, and all other incidentals for underdrains shall be included in the cost of underdrain, patching. 718.10 762 The cost of repairing underdrains damaged by activities other than for structure installation, or as defined above, shall be at no additional cost to the Department. The cost of disposal of unsuitable excavated materials, installation of pipe end caps, rodent screens, and other incidentals shall be included in the cost of the pay items in this section. 220