307Impermeable Membrane for Subgrades, Basins, Ditches, and Canals

307.1 General Description

This work includes installing materials to serve as an impermeable membrane. The membrane prevents water seepage beneath the installation level shown on the Plans.

307.1.01 Definitions

General Provisions 101 through 150.

307.1.02 Related References

A. Standard Specifications Section 888—Waterproofing Membrane Material B. Referenced Documents General Provisions 101 through 150.

307.1.03 Submittals

General Provisions 101 through 150.

307.2 Materials

Use the following materials to construct the waterproofing layer (impermeable membrane): • Cross-laminated, high-density polyethylene film • Flexible, self-adhesive, rubberized asphalt Ensure that these materials meet the requirements of Subsection 888.2.03. As an alternative and if approved by the Engineer, use another equal system that has at least a 5-year serviceability record.

307.2.01 Delivery, Storage, and Handling

General Provisions 101 through 150.

307.3 Construction Requirements

307.3.01 Personnel

General Provisions 101 through 150.

307.3.02 Equipment

General Provisions 101 through 150.

307.3.03 Preparation

General Provisions 101 through 150.

307.3.04 Fabrication

General Provisions 101 through 150. Section 307 — Impermeable Membrane for Subgrades, Basins, Ditches, and Canals

307.3.05 Construction

A. Installation Install according to the Plans. B. Placement Place the membrane on a soil blanket or cushion at least 6 in. (150 mm) thick, that contains material fine enough to pass through a No. 10 (2 mm) sieve. Take care not to form a “slip plane” between the underlying soil and overlying material. Ensure that the membrane is at least 4 ft. (1.2 m) wide, with seam strengths at least 95 percent of the membrane strength. C. Protection During construction, protect the membrane from damage at all times. Remove and replace sections damaged by sunlight, heat, sharp objects, or any other source, at no cost to the Department.

307.3.06 Quality Acceptance

General Provisions 101 through 150.

307.3.07 Contractor Warranty and Maintenance

General Provisions 101 through 150.

307.4 Measurement

Impermeable membrane for subgrades, basins, ditches, and canals is measured by the number of square yards (meters) of subgrade, basins, ditches, and canals.

307.4.01 Limits

Extra, overlapping material required to produce a uniform membrane is not measured.

307.5 Payment

Impermeable membrane for subgrades, basins, ditches, and canals will be paid for at the Contract Unit Price per square yard (meter). This payment will be full compensation for preparing the surfaces, furnishing the membrane system materials, and applying the membrane system. Payment will be made under: Item No. 307 Impermeable membrane for subgrades, basins, ditches, and canals Per square yard (meter)

307.5.01 Adjustments

General Provisions 101 through 150.