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• Precast concrete pipe risers and pipe reducers, and precast concrete pipe sections, adjustment rings and tapered <br /> sections for pipe energy dissipators, pipe inlets and pipe manholes shall conform to the requirements in AASHTO <br /> Designation: M 199M, except that the cementitious material and aggregate shall conform to the provisions in Section 90-2, <br /> "Materials," except that mortar strengths relative to Ottawa sand and grading requirements shall not apply to the aggregate. <br /> Use of supplementary cementitious material shall conform to the requirements in AASHTO Designation: M 170M. <br /> The second paragraph of Section 70-1.03,"Installation,"of the Standard Specifications is amended to read: <br /> • Cutoff walls for precast concrete flared end sections shall be constructed of minor concrete conforming to the <br /> provisions in Section 90-10, "Minor Concrete." Minor concrete shall contain not less than 275 kg of cementitious material <br /> per cubic meter. <br /> SECTION 72: SLOPE PROTECTION <br /> Issue Date: November 18,2005 <br /> The sixth paragraph of Section 72-4.04, "Construction,"of the Standard Specifications is amended to read: <br /> • Pervious backfill material, if required by the plans, shall be placed as shown. A securely tied sack containing <br /> 0.03-m3 of pervious backfill material shall be placed at each weep hole and drain hole. The sack material shall conform to <br /> the provisions in Section 88-1.03,"Filter Fabric." <br /> SECTION 73: CONCRETE CURBS AND SIDEWALKS <br /> Issue Date: January 5,2007 <br /> The second subparagraph of the second paragraph of Section 73-1.01, "Description," of the Standard Specifications is <br /> amended to read: <br /> 2. Minor concrete shall contain not less than 275 kg of cementitious material per cubic meter except that when <br /> extruded or slip-formed curbs are constructed using 9.5-mm maximum size aggregate, minor concrete shall <br /> contain not less than 325 kg of cementitious material per cubic meter. <br /> SECTION 75: MISCELLANEOUS METAL <br /> Issue Date: January 5,2007 <br /> The table in the tenth paragraph of Section 75-1.02, "Miscellaneous Iron and Steel," of the Standard Specifications is <br /> amended to read: <br /> Contract No. 10-OM7104 <br /> 51 <br />