666Vertical Drainage Wicks

666.1 General Description

This work includes furnishing and installing vertical drainage wicks according to locations and depths shown on the plans, or as directed by the Engineer.

666.1.01 Definitions

General Provisions 101 through 150.

666.1.02 Related References

A. Standard Specifications Section 106—Control of Materials B. Referenced Documents ASTM D 4632 ASTM D 751 ASTM D 1424

666.1.03 Submittals

A. Materials Certification Furnish the Engineer with materials certification, in duplicate, according to Subsection 106.05, Materials Certification. B. Installation Sequence and Method Details Submit installation sequence and method details to the Engineer for review at least two weeks before installing the drainage wick. The Engineer’s approval of the installation sequence and method does not constitute acceptance of the installation method. If at any time the Engineer feels the installation method does not produce a satisfactory drainage wick, alter the method or equipment to comply with these specifications.

666.2 Materials

A. Drain Fabrication Ensure the following: • Use drainage wicks consisting of a band–shaped plastic case, permitting continuous vertical drainage, wrapped in a filter jacket, installed in the ground by displacement methods, and spaced and arranged as shown on the plans. Ensure drainage wicks are a prefabricated type consisting of a plastic drainage core encased in or integrated with a nonwoven polyester filter jacket. Use a band-shaped drain with an aspect ratio (width divided by thickness) not exceeding 50. Ensure the jacket allows free passage of pore water to the core without loss of soil material or piping. Ensure the core provides continuous vertical drainage. • Ensure the assembled drains are resistant to wet rot, mildew, bacterial action, insects, salts, acids, alkalis, solvents, or any other ingredients in the site groundwater harmful to the drains. Use drains free from defects, rips, holes or flaws. • Ensure the filter jacket is capable of resisting all bending, puncturing, and tensile forces imposed during installation and during the design life of the drain. Use a jacket material resistant to localized damage (e.g., punching through the filter by sand or gravel particles) and sufficiently rigid to withstand lateral earth pressures due to embedment and surcharge so the vertical flow capacity through the core will not be adversely affected. Ensure the jacket material is sufficiently flexible to bend smoothly during installation and induced consolidation settlement without damage, and will not undergo cracking or peeling during installation of the drain. • Ensure the core is a continuous plastic material fabricated to promote drainage along the axis of the vertical drain. B. Physical Properties Ensure that the drain meets minimum requirements according to the following: Filter Breaking Load ASTM D 4632 30 lbs./in width (5 N/mm width) Mullenburst ASTM D 751 85 lbs./in2 (585 kPa) Elmendorf Tear ASTM D 1424 200 grams Permeability Coefficient 1x10-4 in/sec (3x10 -3 mm/s)

666.2.01 Delivery, Storage, and Handling

A. Drain Protection Ensure that the drain is wrapped in burlap or a similar heavy-duty covering during shipment and storage. B. Storage Protection Protect the storage area from sunlight, mud, dirt, dust, debris, and detrimental substances.

666.3 Construction Requirements

666.3.01 Personnel

General Provisions 101 through 150.

666.3.02 Equipment

The Contractor is responsible for selecting the proper size and amount of equipment. A. Approval of Equipment Adhere to the following requirements for equipment: 1. Secure approval of all equipment before beginning work. 2. Promptly replace or supplement unsatisfactory equipment. 3. Note that equipment is approved for use on a trial basis. 4. Remove, replace, or supplement equipment that proves unsatisfactory after a short test section is complete. B. Required Equipment Choose a type of carrier depending upon the desired installation force, and then ensure the following: • The carrier is equipped with a mandrel or sleeve to protect the wick from tears, cuts, and abrasions during installation. • The protective mandrel or sleeve has at least a 10 in.² (6450 mm²) cross sectional area. C. Precautions Take precautions to protect instrumentation devices. Replace, at no additional cost to the Department, any equipment that is damaged or becomes unreliable during construction due to construction operations.

666.3.03 Preparation

A. Location Stakes Prior to drain installation, the Engineer will stake the proposed drain locations. Take reasonable precautions to preserve the stakes. Ensure that drain locations do not vary by more than 6 in. (150 mm) from locations indicated on the plans, or as directed by the Engineer. B. Trial Drain Install a trial drain at a location designated by the Engineer to demonstrate that the equipment, method, and materials will provide a satisfactory installation according to this specification.

666.3.04 Fabrication

General Provisions 101 through 150.

666.3.05 Construction

A. Installation Depth 1. Install drainage wicks to the depth shown on the plans or to a depth where reasonable efforts at further penetration fail. The Engineer may vary the wick depths, spacings, or numbers installed, and may revise plan limits for this work. 2. Provide a means of determining the wick depth and quantity of wick used at each drain location and at any time. B. Installation of Drains 1. Normal Installation Use a mandrel or sleeve to install the drainage wick, as follows: a. Ensure that the mandrel or sleeve completely encloses and protects the drainage wick during installation. b. Force the mandrel containing the wick vertically into the ground to the required depth. c. Cut the mandrel neatly at its upper end after installation. d. Ensure that a 4 in. to 8 in. (100 mm to 200 mm) length of wick protrudes from the ground. 2. Drilling Upper Soils If necessary, drill through the dense upper soils before installing the prefabricated drains. Do not drill more than 2 ft. (600 mm) into the underlying compressible soils, as determined by the Engineer. 3. Obstruction of Depth If obstructions cannot be penetrated using normal and accepted procedures, do the following: a. Complete the drain from the point of obstruction to the surface. b. Notify the Engineer. c. At the direction of the Engineer, install a new drain within 18 in. (450 mm) of the obstructed drain. 4. Wick Make splices or connections in the drainage wick to ensure continuity. C. Wick Alignment 1. Carefully check equipment for plumbness before advancing each wick. 2. Ensure that wicks do not deviate more than 1 in./ft. (85 mm/m) from the vertical.

666.3.06 Quality Acceptance

No compensation will be allowed for materials, work performed, or drilling if wicks are unsatisfactory. The Engineer will reject wicks that are: • Out of location by more than 6 in. (150 mm) • Damaged in construction • Improperly completed

666.3.07 Contractor Warranty and Maintenance

General Provisions 101 through 150.

666.4 Measurement

This work is measured according to the following: • Drill holes are measured in linear feet (meters), to the nearest 0.1 ft. (0.03 m). • Vertical drainage wicks are measured in linear feet (meters), to the nearest 0.1 ft. (0.03 m).

666.4.01 Limits

General Provisions 101 through 150.

666.5 Payment

This work will be paid for at the Contract Price for the accepted quantity of drill holes and vertical drainage wicks, complete and in-place. Payment is full compensation for: • Drilling holes • Furnishing materials • Placing materials • Providing labor, equipment, tools, and incidentals necessary to complete the work The Contract Price will be for the number of drains at the spacing shown on the plans. Payment will be made under: Item No. 666 Drill holes Per linear foot (meter) Item No. 666 Vertical drainage wicks Per linear foot (meter)

666.5.01 Adjustments

General Provisions 101 through 150.