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PGSF WMVD Storm and Combined Sewer - Construction Package 2 Concrete Forming <br />Project No. 180162 03 11 00 - 5 <br /> <br />11. Thickness; footings and foundations: <br />minus 5 percent <br />no limit on the maximum increase except that which may interfere with other <br />construction. <br />12. Step variance in flight of stairs: <br />Rise ± 1/16 inch <br />Tread from level ± 1/8 inch <br />B. Use control points and benchmarks for reference purposes to check tolerances. <br />Establish and maintain reference points in an undisturbed condition until final <br />completion and acceptance of the work. <br />C. Regardless of tolerances listed, no portion of a structure shall extend beyond the legal <br />boundary of work site. <br />D. Camber formwork to compensate for anticipated deflections in formwork under wet load <br />of concrete. Adjust camber to maintain above specified tolerances in hardened concrete <br />after forms and shoring are removed. <br />3.04 REMOVAL OF FORMS <br />A. Do not impose construction loads or remove shoring from any part of the structure until <br />that portion of the structure in combination with remaining forming and shoring systems <br />has sufficient strength to safely support its weight and loads placed thereon. <br />B. If forms are loosened and not removed, proceed same day with wet curing operations to <br />soak surfaces of concrete where forms are loosened. When wet curing is not practical or <br />not planned, loosen, remove, and start approved curing procedures on the same day. <br />C. When required for concrete curing in hot weather, required for repair of surface defects, <br />or when required for finishing at an early age; remove forms as soon as concrete has <br />hardened sufficiently to resist damage from removal operations or lack of support. <br />D. Remove top forms on sloping surfaces as soon as concrete has attained sufficient <br />stiffness to prevent sagging. Make repairs or finishing treatment on such sloping <br />surfaces immediately after form removal. <br />E. Remove wood forms for wall openings as soon as this can be accomplished without <br />damage to concrete. <br />F. Remove formwork from columns, walls, sides of beams, and other parts not supporting <br />weight of concrete as soon as concrete has hardened sufficiently to resist damage from <br />removal. <br />G. When shores and supports are so arranged such that non-load-carrying form facing <br />material can be removed without loosening or disturbing other shores and supports, <br />facing material may be removed when concrete has sufficiently hardened to resist <br />damage from removal.