GEO-TECHNICS AMERICA, INC

Horizontal Strip Drain Installation Specifications

The following are suggested specifications for the installation of prefabricated plastic horizontal strip drains

A. Description

The Contractor shall furnish all necessary labor, equipment, and materials and perform all operations necessary for the installation of the horizontal strip drains in accordance with the details shown on the plans and with the requirements of these specifications. The drains shall consist of a polymeric core enclosed in a suitable filter material and shall be spaced and arranged as shown on the plans or as otherwise directed by the Engineer.

B. Material

The strip drain shall be a prefabricated type made up of a polymeric drainage core wrapped in a filter made of a non-woven fabric of continuous filaments of 100% polypropylene similar to the product known as AKWADRAIN^TM strip drain, or approved equal. The core shall be fabricated with suitable drainage channels.

The drain shall be of United States manufacture and have the following minimum properties:

Drain
Weight	4.0 oz/ft	0.35 kg/m
Width	11 inches	280 mm
Thickness	1 inch	25 mm
Compressive strength	9000lbs/ft²	690 kN/m²	ASTM D1621
Shear strength	9000 lb/ft²	690 kN/m²	ASTM D1621(mod)
Fungus resistance	No growth	No growth	ASTM G21
Discharge capacity	20 gpm	75 lpm	ASTM D4716
Fabric
Weight	3.9 oz/ft²	130 gm/m²	ASTM D3776
Grab tensile strength	100 lbs	440N	ASTM D4632
Elongation at break	>40 %	>40 %	ASTM D4632
Trapezoidal tear	45 lbs	200N	ASTM D4533
Puncture strength	60 lbs	260N	ASTM D4833
Mullen burst	200 psi	1300 kPa	ASTM D3786
AOS	70 sieve	215 micron	ASTM D4751
Flow rate	70 gpm/ft²	3,000 lpm/m²	ASTM D4491
Permeability	0.30 cm/sec	0.30 cm/sec	ASTM D4491
UV Resistance, 500 hr.	80% retained	80% retained	ASTM D4355

The Contractor shall submit drain samples and indicate the source of the proposed materials prior to delivery to the site and shall allow sufficient time for the Engineer to evaluate the material.

At least two weeks prior to the installation of drains, the contractor shall submit to the Engineer for his review and approval, details of the sequence and method of installation. Approval by the Engineer will not relieve the Contractor of his responsibility to install drains in accordance with these specifications.

C. Construction Requirements

Prior to the installation of drains within the designated area the Contractor shall demonstrate that his equipment, method and materials produce a satisfactory installation in accordance with these specifications. For this purpose, the Contractor will be required to install trial drains at locations designated by the Engineer. Payment will be at the bid price per linear foot(meter) for the drains. Payment will not be made for installing unsatisfactory trial drains.

As a minimum experience requirement, the contractor shall have successfully completed three drain installation projects. The three projects shall be identified by project name, location, project description, size, completion date, and contract manager.

Approval by the Engineer of the method and equipment used to install the trial drains shall not constitute, necessarily, acceptance of the method for the remainder of the project. If at any time, the Engineer considers that the method of installation does not produce a satisfactory drain, the Contractor shall alter his method and/or equipment as necessary to comply with these specifications.

Drains will be located by the Engineer. The location of the drains shall not vary by more than 6 inches(150mm) from the locations indicated on the drawings or as directed by the Engineer.

Drains that are out of their proper location by more than 6 inches(150 mm) or drains that are damaged in construction, or drains that are improperly completed shall be rejected by the Engineer, and no compensation will be allowed for any materials furnished or for any work performed on such drains.

The contractor shall provide the Engineer with suitable means of making a linear determination of the quantity of drain material used.

Splices or connections in the drainage material shall be done in a workmanlike manner and so as to insure continuity of drain material.

The Contractor shall observe precautions necessary for protection of instrumentation devices. After instrumentation devices have been installed, the Contractor shall replace at his cost any equipment that is damaged or becomes unreliable as a result of his negligence.

D. Method of Measurement

Strip drains will be measured by the linear foot (meter) for the full length of drain complete and in place.

E. Basis of Payment

Payment for drains will be made at the contract unit price per linear foot (meter), which price shall be full compensation for the cost of furnishing the full length of drain material, installing the drain in accordance with the plans and specifications, and shall also include the cost of furnishing all tools, materials, labor, equipment and all other costs necessary to complete the required work. No direct payment will be made for unacceptable drainage drains or for any delays or expenses incurred through changes necessitated by improper or unacceptable material or equipment, but the costs of such shall be included in the unit price bid for this work.

For additional information installing strip drain, other GTA contracting services, or for assistance with your next ground improvement project, call us at (770) 719-9495, fax us at (770) 719-1907, or email us at RussJoiner@msn.com