218Impermeable Plastic Membrane

Impermeable Plastic Membrane

218.1DESCRIPTION

1 This section describes the requirements for furnishing and placing impermeable plastic membrane.

218.2MATERIALS

1 Provide materials in accordance with the following:

Materials Subsection Impermeable Plastic Membrane 0805

218.3EQUIPMENT—V acant

218.4CONSTRUCTION

218.4.1 General

1 During shipment and storage, protect membrane rolls from direct sunlight, ultraviolet rays, moisture, temperatures greater than 140 °F [60 °C], mud, dirt, dust, and debris. When storing outdoors, elevate the rolls, and protect them with a waterproof cover . Remove unprotected membrane from the project.

2 Submit test results and certification by the manufacturer showing the membrane performance relative to requirements. Submit a test sample 6 ft [2 m] long by the full width of the roll at least 14 calendar days before the use of any membrane. Obtain this sample from a roll of membrane that is on the project site. Make sure the sample is labeled with the product name, machine direction, lot and batc h number, date of sampling, project number, and certification of compliance.

3 Do not place membrane during wet weather or when the subgrade is wet.

218.4.2 Installation

218.4.2.1 General

1 Overlap longitudinal and lateral joints at least 6 in [150 mm] and glue using a product type, application rate, and curing procedure recommended by the membrane manufacturer. If joints are not glued, overlap the membrane at least 24 in [600 mm] . Shingle the overlaps so that the exposed edges face the same direction as the flow of drainage. Reinforce and seal blemishes, holes, or scars with waterproof plastic adhesive tape. Replace damaged portions of membrane and unsealed joints, at no additional cost

Impermeable Plastic Membrane SECTION 218

to the department. Prior to installation, smooth the subgrade to remove ruts, depressions, or humps. Ensure the surface is free of objects that might tear or puncture the geomembrane.

2 Do not use pegs or pins to hold membrane in place. Place cover material over membrane daily. Equipment may run—but not turn—directly on membrane when placing membrane or cover material.

Replace membrane damaged after installation because of construction activities, at no additional cost to the department.

4 When required by the engineer, prepare the subgrade with smooth drum roller passes prior to membrane placement.

218.4.2.3 Trenches

1 For vertical installation in trenches, use backfill from the trench excavation and place to prevent damage to the membrane. For backfill that will come in direct contact with the membrane, provide material that is approved by the engineer before use and is free of objects that might puncture or tear the membrane. Backfill the trench immediately after placing the membrane. Compact and finish backfill in accordance with Subsection 203.4.3, Embankment and Cut Areas with Moisture and Density Control.

218.5MEASUREMENT and PAYMENT

218.5.1 General

1 The engineer will measure Impermeable Plastic Membrane by the square yard [square meter] of surface area, including vertical surfaces in trenches, with no allowance for overlaps.

2 The department will pay as follows:

Pay Item

Pay Unit Measure to the Nearest Pay to the Nearest Impermeable Plastic Membrane SY [m2] 0.1 ft [0.5 m] SY [m2]

218.5.2 Referenced Sections for Direct Payment

1 When specified, the engineer will measure and pay for Crushed Base in accordance with Section 301, Aggregate Subbase, Base Courses, and Bed Course Material.