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; • 2. Foundation: Excavate, shape and compact to a firm, uniform bearing surface, conforming to the planned section and established grade. Remove unsuitable grade soils and replace as directed. Granular material , as specified and where required by the Drawing, shall be furnished, placed, and compacted to 95 percent Modified Proctor Density to a depth of 12 inches. B. Forms 1 . All forms shall have a minimum height without horizontal joint equal to the depth of the curb, and must be of sufficiently rigid construction to insure that they will remain true to line and grade. 2. Forms with height greater than the thickness of concrete may be used if the upper edge is set accurately to line and grade and the subgrade under the form is excavated to meet the bottom edge of the form. 3. Clean and oil forms each time they are set. Hold securely in place by adequate stakes and bracing. 4. Use flexible or curved forms of proper radii for curves having radii of 100 feet or less. 5. Remove unsatisfactory forms from the line of work and do not reset. Repaired forms �shall not be used until they have been inspected and approved by the Architect/Engineer. . 6. Set forms accurately to line and grade. If the forms are set more than O.Ol� foot above or below grade or more than 0.02 foot from � � prescribed alignment, they shall be corrected before any concrete is placed. 7. Slipform equipment may be used if the resulting curb and gutter conforms with the Drawings and the finish is satisfactory to the Architect/Engineer. C. Placing Concrete � 1 . Immediately before placing the concrete; the inside faces of the forms shall be wetted and the subgrade moistened with water if subgrade paper is not used. Strike concrete off to the required cross section by curb mule or power curber. The upper face of the gutter slab and the front face and the top of the curb shall be smoothed with a wood float. Side forms shall remain in place for at least 12 hours after the concrete has been cast. All cavities shall be filled with mortar, upon removal of the side forms. D. Concrete Finish 1 . After the water sheen has disappeared, joints and edges shall be rounded to the radii shown in the plans. 2. All concrete surfaces exposed to view shall be lightly brushed to a uniform texture. 3. Test gutter flowline with a ten faot straight edge. Correct depressions that will hold water. E. Joints l. Expansion joints shall be formed by installing normal to the surface, a 3/4-inch section of bituminous fiber joint shaped to the full width of cross section and extending from 1 inch below the finished surface to the subgrade. The space above the expansion joint shall be kept open by a suitable cap until the concrete is finished. 2. The contraction joints may be formed by inserting into the concrete a plane of weakness not less than one-half the depth of the concrete, or by sawing to a depth at least 1/4 the thickness of the concrete. 3. All joints shall be sealed with hot-poured concrete joint sealer. � � 02522-2 191/1/1006.1