678PERMANENT BARRICADES

678.1DESCRIPTION—This work is construction of permanent barricades.

678.2MATERIAL—As shown on the Standard Drawings and as follows:

Mountain Hemlock; Western Hemlock; or sound square edge Red Oaks; seasoned before treatment as required by AWPA or AWPB Standards; and pressure treated according to AWPA and AWPB Standards and as follows:

Treatment (Species except Red Oaks) Retention (pounds per cubic foot) Ammoniacal Copper Arsenite

Pentachlorophenol 0.60 Chromated Copper Arsenate

(Red Oaks) Pentachlorophenol 0.30

Certify as specified in Section 106.03(b)3. A tolerance of 1/2 inch scant from nominal dimensions is required for the size of posts. Do not use posts that, for any reason, prevent attachment of guide rail fittings or alignment with other posts. Throughout the project, use posts treated with the same type of preservative.

Douglas Fir; pressure treated as specified. Certify as specified in Section 106.03(b)3.

section, of equal or greater section modulus, with suitable dimensions to utilize the mounting hardware. Certify as specified in Section 106.03(b)3.

specified in Section 106.03(b)3.

• Aluminum Hardware Items. Section 1103.11

• Aluminum Round Head Wood or Lag Screws. Section 1103.11

• Other Hardware Items. Section 1109.05

678.3CONSTRUCTION—As shown on the Standard Drawings, using either aluminum channels or wood

planks with wood or steel posts. Apply the reflective sheeting to the aluminum channels as specified in Section 1103.02(c) or to the aluminum blank as specified in Section 1103.03(b). The post spacing may vary to a maximum of 10 feet center -to-center. Mechanically drive posts or erect in concrete footings. Cut and peen bolts against the faces of nuts. After erection, treat galvanized components, including the cut ends of bolts, that are abraded or damaged as specified in Section 620.3(a)1.

678.4MEASUREMENT AND PAYMENT—Linear Foot