WICK DRAINS AND STRIP DRAINS 614.02 563 Jacked Conduit does not include the pipe to be placed inside the casing. The pipe will be measured separately for payment. The Department will consider the removal and disposal of excess material to be included in the contract unit price for other relevan t excavation and removal pay items. The Department will consider payment of PP pipe as full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified in the Plans. WICK DRAINS AND STRIP DRAIN S
614.01 Description
This work consists of installing prefabricated wick drains and strip drains.
614.02 Materials
A.Wick Drains Provide prefabricated wick drains with a free -draining, flexible -plastic core wrapped in a non-woven filter fabric. Fabricate the core with drainage channels. Provide a rigid wick drain capable of withstanding lateral earth pressures due to embedment and surcharge, so the vertical flow capacity through the core will not be ad versely affected. Ensure the prefabricated drains resist wet rot, mildew, bacterial action, and insects. Provide prefabricated drains with discharge capacities of at least 1.5 gal/min [5.68 L/min] if measured under 1 gradient at 40 psi [276 kPa] in accord ance with ASTM D 4716/D4716M. Use Alidrain, Ameridrain (Type 407), Mebra Drain, or an approved equivalent for the prefabricated drains. Provide Type B Certifications for these drains in accordance with Subsection 106.04, “Material Certifications.” Submit samples of other materials of the prefabricated drain for evaluation and approval at least one month before beginning work.
B.Strip Drains Provide strip drains that are flexible, prefabricated, rectangu lar shaped, composite products. The drain conduit must consist of a polyolefin inner core completely wrapped by a filter fabric. Ensure the inner core supports the fabric that acts as a filter, stiffener, and flow channel for water draining downgrade to t he outlet laterals. Permanently bond the filter fabric to the core protrusion. Ensure at least 70 protrusions from the inner core per square foot [753 protrusions per square meter] of strip drain surface. Ensure at least 90 percent of the protrusions ar e bonded to the filter fabric. Provide non -woven filter fabric that consists of long chain synthetic polymers composed of at least 85 percent by weight polyolefins, polyesters, or polyamides.
614.03 Wick Dra Ins and Strip Drains
564 Interconnect the horizontal and vertical flow of water within th e strip drain for the full height of the core at all times. The drainage core with the geotextile laminated to one side of the core must provide a flow rate of at least 1 qt/sec/yd [1 L/sec/m] of width when tested in accordance with ASTM D 4716/D4716M und er the test conditions in Subsection 614.02.A, “Wick Drains,” with a gradient of 1. Consider the flow rate on the in -flow face to determine core acceptability if core construction separates the flow channel into two o r more sections. Attach the geotextile to the core to prevent folding, wrinkling, or other movement during handling or after placement. Use nonwater -soluble, heat -sealing, or other bonding methods recommended by the manufacturer. Use adhesive in areas of the geotextile fabric where flow is not expected. Maintain the required strength values of the geotextile if heat sealing . Encapsulate the collector pipe by extending the geotextile below the bottom of the core length. Avoid exposing the fabric to ultrav iolet radiation. The Resident Engineer will reject fabric that is exposed for more than 30 days from the manufacture date to the completion of installation.
1.Handling and Storage The manufacturer will provide the strip drain wrapped in black plastic or in covered rolls for storage, handling and placement.
2.Strip Drain Assembly Materials Certification Provide a Type A Materials Certification for strip drains in accordance with Subsection 106.04, “Material Certifica tions,” for tests, except for composite in -plane flow and compressive strength. For strip drain in -place flow and compressive strength, provide a Type B Materials Certification in accordance with Subsection 106.04, “Ma terial Certifications.” Provide a 9 ft [2.7 m] sample of the strip drain from each lot or shipment to the Department's Materials Engineer for inspection and testing. The Resident Engineer will not require a fabric bond to the core if the structural integr ity of the drain is defined and provided by the core alone.
614.03 Equipment
Install drainage wicks with equipment that will cause the least amount of subsoil disturbance during the installation operation. Install the drainage wick using a sleeve or mandre l that intrudes into the soil. Ensure the sleeve protects the wick material from tears, cuts, and abrasions during installation. Provide a sleeve with a cross sectional area no greater than 12 in² [7,741 mm²]. To minimize disturbance to the subsoil, int rude the sleeve into the subsoil using static or vibratory methods; the Department will not allow impact methods. Ensure the sleeve has an “anchor” rod or plate at the bottom to prevent the soil from entering the bottom of the sleeve during installation an d to anchor the bottom of the drain when the sleeve is removed. Submit the details of the sequence and method of installation to the Resident Engineer at least two weeks before installing the drainage wicks. WICK DRAINS AND STRIP DRAINS 614.04 565 614.04 CONSTRUCTION METHODS
A.General The Resident Engineer will allow the installation of wick drains when the minimum experience requirements are met. The minimum experience requirement consists of successfully completing three wick drain installation projects. Identify the three projects by p roject name, location, description, size, completion date, and contract manager. Construct a work platform to install the drains. Keep the work platform in place and allow it to become part of the embankment.
B.Wick Drains Show that the equipment, metho d, and materials produce an installation that complies with the Contract before installing drainage wicks. Install trial wicks at locations directed by the Resident Engineer. The Resident Engineer’s approval of the method and equipment to install the tria l wicks does not constitute acceptance of the method for the remainder of the Project. If the Resident Engineer decides the method of installation produces unsatisfactory wick, alter the method, equipment, or both. Locate, number, and mark drainage wicks. Take precautions to preserve the markings. Ensure drainage wick locations do not vary by more than 6 in [150 mm] from the locations shown on the Plans or directed by the Resident Engineer. Install drainage wicks from the working surface to the depth shown on the Plans or to a depth where the soil resists an effort at further penetration using equipment that meets the minimum requirements. The Resident Engineer may revise the Plan limits and vary the depths, spacing, or the number of wicks. Check the eq uipment for plumb before advancing each wick, and ensure it does not deviate by more than 4 percent from vertical. The Resident Engineer will reject wicks that are visibly damaged or are out of place by more than 6 in [150 mm]. Provide the Resident Enginee r with a means to determine the linear quantity of wick material at each wick location. During installation of the wick, provide a means of determining the depth of the drainage wick. Splice or connect the drainage wick material to ensure wick material co ntinuity. Ensure a length of wick drain protrudes above the surface at each wick installation to secure the wick drain to the strip drain. Neatly cut the wick material at the upper edge. To loosen stiff upper surface soils before installing the drainage wicks, use the auger or other methods, provided that the auger does not extend more than 2 ft [0.6 m] into the soils. Complete the drain from the elevation of the obstruction to the working surface. Notify the Resident Engineer where obstructions are enco untered below the working surface that cannot be penetrated using equipment meeting the minimum requirements. Install a new drain 18 in [455 mm] from the obstructed drain as directed by the Resident Engineer.
615.01 Sanitary Sewer Pipe Conduits
566 Protect instrumentation devices. Replace dama ged instrumentation devices at no additional cost to the Department.
C.Strip Drains Lay strip drains flat and straight with minimal slack. Place strip drain products with a hard back and protrusions so the core back lies next to the ground with the studs pointing up. Ensure splices are neat and made in accordance with the manufacturer's recommendations using kits provided by the manufacturer. Secure the wick or strip drains and ensure the drains remain connected and in place throughout the construction process. Use end dumping for the first layer of embankment to avoid damage to the drains from equipment traffic. Construct a 2 ft [0.6 m] “bridge lift” over the horizontal drains using low ground pressure equipment and light compaction.
614.05 Method of M Easurement
The Resident Engineer will measure the length of prefabricated strip and wick drains (including trial drains) along the centerline of the drain.
614.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.PREFABRICATED WICK DRAIN Linear Foot [Meter]
B.PREFABRICATED STRIP DRAIN Linear Foot [Meter] The Department will pay for the volume of work platforms as Unclassified Borrow or Unclassified Excavation in accordance with Section 202, "Earthwork." Include the cost of auguring stiff soils to be included in the contract unit price for Prefabricated Wick Drain. SECTION 615 SANITARY SEWER PIPE CONDUITS
615.01 Description
This work consists of constructing sanitary sewer pipe. Refer to the Oklahoma Department of Environmental Q uality (ODEQ) Regulations, the manufacturers’ recommendations, ASTM, ANSI, AWWA, and the Public Utility for whom the work is to be performed for additional specifications. The Special Provisions, Plans, Public Utility Specifications, Supplemental, or Stan dard Specification will govern over the ODEQ minimum regulations.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 577–579 of 935.