for Highway Construction Page 482 of 715 SECTION 606 – PIPE UNDERDRAINS AND URBAN AND RURAL EDGE DRAINS
606.01 Description.
Provide, plac e, and ins pect pipe underdrains , rural edge drains , and urban edge drain pipes.
606.02 Materials.
Provide materials as specified in: Coarse Aggregate for Concrete (Drain Rock ) (Coarse Aggregate Size 1, 2a, 2b) ....................................................................................... 703.02.C Grout (Mortar) .......................................................................................................................... 705.04 Corrugated PE Drainage Tubing, Perforated and U nperforated .............................................. 706.10 Metallic -Coated Corrugated Steel Underdrains ....................................................................... 706.07 Corrugated Aluminum Pipe for Underdrains ............................................................................ 706.08 PVC Pipe, Perforated and Unperforated .................................................................................. 706.14 Fittings for PE Drainage Tubing .............................................................................................. 706.20 Rodent Protection Devices for Trench Drain ........................................................................... 706.21 Edge Drain Markers ................................................................................................................. 712.10 Subgrade Separation Geotextile , Type III ................................................................................ 718.07 Corrugat ed Steel Pipe, Metallic -Coated, for Sewers and Drains ................................. AASHTO M 36 Provide drain rock that is clean angular quarried or crushed rock. The Department will accept drain rock by certification . Submit quality control test results that represent each 500 tons of drain rock placed, with at least 1 test per contract , including gradation (AASHTO T 27 with no wash required) and sand equivalent (AASHTO T 176) to veri fy the certification. Perform quality control sampling and testing using a qualified independent laboratory and submit the test results. The Contractor may provide a grout product that is on the QPL or submit a proposed mix design for approval. Submit a completed certification ITD-0851 form.
606.03 Construction Requirements.
A.General. Line the trench with geotextil e. Lay perforated pipe with the perforations down. Place drain rock around the pipe and to the elevation over the pipe. Fold geotextile over the drain rock and overlap at least 2 feet on the top and at the drain ends. Place approved backfil l material to the top of the trench and compact. Install geotextile, drainage pipe or tubing, and aggregate backfill as specified or as directed. Place the m aterials as specified over pipe underdrains , urban edge drains , and rural edge drains .
B.Urban Edge Drains . Field -verify locations of urban edge drains in the Engineer’s presence. for Highway Construction Page 483 of 715 At locations where a storm sewer exists or is to be constructed, the following applies:
1.Place the edge drains on the low side of the r oadway.
2.Install edge drains to discharge into stormwater sewer catch basins.
3.Cap edge drain inlets in stormwater sewer catch basins and make their outlet pipes drain to a stormwater sewer catch basin.
4.Construct the edge drain slope to follow the grade of the roadway except where side street grades will not allow.
5.Slope side street edge drains as specified or as directed.
6.Where the plans show edge drain pipe connect ing to stormwater sewer catch basin s, make the connection by coring the concrete wall of the catch basin, place the end of the edge drain pipe in line with the inside wall of the catch basin.
7.Seal the gap between the edge drain and the concrete wall of the catch basin with grout (mortar) and ensure a watertight connection.
C.Rural E dge Drains and Pi pe Underdrains . Excavate for rural edge drains and pipe underdrains as specified in 210. Install rodent protection devices for outlet pipes and mark them with a w itness post as specified in 618 bearing the letters UD on white reflective sheeting. Place the outlet pipes in 10- foot long corrugated steel pipe sleeves extending from the rodent protectors and with the diameter of the corrugated steel pipes just large enough to allow the outlet pipes to fit through. Ensure the maximum depth of trench excavation for pipe underdrains is less than 5 feet.
D.Drain Rock . Place dr ain rock within designated areas.
E.Inspection. Before final acceptance of the work, demonstrate t o the Engineer the drains and outlet pipes are in good condition and have not been damaged during or after installation. Use video inspection equipment to record the drains condition and submit copies of the videos in an approved format. Notify the Engineer at least 24 hours before the video inspection so the Engineer may witness the videotaping. Provide video inspection equipment capable of superimposing the date, time, and location on the picture at the time of inspection. If the video inspection shows damage, repair the damage at no additional cost to the Department.
606.04 Method of Measurement.
The Engineer will measure acceptably completed work by the foot.
606.05 Basis of Payment .
The Department will pay for accept ed quantities as follows: Pay Item Pay Unit Pipe Underdrain ...................................................................................... FT for Highway Construction Page 484 of 71 5 Urban Edge Drain ................................................................................... FT Rural Edge Drain .................................................................................... FT Concrete coring, grout (mortar), or other items necessary to complete the installation are incidental and the cost included in the urban edge drain contract unit price. Video inspection is incidental and included in the contract unit prices for other items. The Department will pay for materials placed over pipe underdrains , urban edge drains, and rural edge drains under their respective contract pay items . for Highway Construction Page 485 of 71 5 SECTION 607 – EMBANKMENT PROTECTORS
607.01 Description.
Provide and install corrugated metal embankment protectors .
607.02 Materials.
Use entrance and exit sections that meet the requirements of AASHTO M 36 or AASHTO M 196. Provide the discharge pipe as specified in 706.06. Use all steel or all aluminum for each assembly.
607.03 Construction Requirements.
Install the entrance device to prevent water from percolating under or around the structure. Install discharge pipe as specified in 602.03. Securely anchor the pipe to the ground surface where it is not possible to provide a trench for the installation.
607.04 Method of Measurement.
The Engineer will measure acceptably completed work as follows:
1.Embankment protectors will be by each unit. An entrance and an exit section is 1 unit.
2.Discharge pipe will be by the foot.
607.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit prices as follows: Pay Item Pay Unit Embankment Protector, Type ___ .......................................................... Each Discharge Pipe ....................................................................................... FT The Department will measure and pay for materials necessary to pave the inlet area as specified in 405 or 406. Excavation , backfill, outlet protection, and anchorage are incidental .
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 518–520 of 768.