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IIII I I u N I I I I 9 700 -3.4.3 Extruded Tubing: For extruded aluminum tubing, meet the requirements shown in the plans. 700 -3.4.4 Castings: Provide aluminum castings of the alloys shown in the plans. For aluminum alternates the Engineer will allow a cast base, provided the Contractor submits test reports giving evidence that the base to be used for each pole size is as strong as the pole with which it is to be used. Perform physical tests and submit certified reports for one base to be used with each pole size. Use Alloy A 356 -T6 for the castings. Use aluminum bolts for connecting parts of the cast base. 700 -3.4.5 Channels: For aluminum channels, meet the requirements of ASTM B 308 [ASTM B 308M] for the alloys shown in the plans. 700 -3.4.6 Bolts, Nuts, and Lockwashers: For aluminum bolts, nuts, and lockwashers, meet the requirements shown in the plans. Ensure that finished bolts and washers are given an anodic coating of at least 0.0002 inch [5 }Lm] in thickness and are chromate - sealed. 700 -3.5 Steel: 700 -3.5.1 General: Only use structural steel, including bolts, nuts, and washers, that have been hot dip galvanized or metalized after fabrication. Perform hot dip galvanizing in accordance with ASTM A 123 [ASTM A 123M] or ASTM A 153 [ASTM A 1 53M] and metalizing in accordance with Section 562. For galvanized steel members, except plate for sign panels, meet the general requirements of Section 962 and the specific requirements of 962 -7. For steel plate for use as sign panels, meet the requirements of ASTM A 283 [ASTM A 283M] for either Grade C or Grade D. 700 -3.5.2 Specific Uses of Aluminum and Galvanized Steel: Use aluminum bolts, nuts, and hardware to connect parts of the cast base. Use galvanized steel anchor bolts for anchoring base plates to concrete bases and for the nuts and washers. For all other metal parts, the Engineer will allow galvanized steel as an alternate to aluminum. 700 -3.6 Bearing Pads: For bearing pads, meet the requirements of 932 -2. 700 -3.7 Reflective Sheeting: Meet the reflective sheeting requirements of Section 994. 700 -3.8 Process Colors: Use transparent and black opaque process colors meeting the requirements of 994 -4 on reflective and nonreflective sheeting. 700 -3.9 Demountable Sign Face Materials: For demountable sign face materials, meet the requirements of Section 995. 700 -4 Preparation of Sign Blanks. 700 -4.1 De- greasing and Etching for Aluminum Sign Blanks: 700 -4.1.1 General: Prior to the application of reflective sheeting, use any of the methods shown below to de- grease and etch the aluminum sign blanks. 700-4.1.2 Hand Method: Under this method, de- grease and etch the blanks in one operation, using steel wool (medium grade) with any of the following combinations of materials: powder. (1) An abrasive cleanser of a commercial grade kitchen scouring (2) Acid and a suitable detergent solution. (3) An alkaline solution. March 2007 01000 -152 03- 4122.D j S