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<br /> <br />PART 2 PRODUCTS <br />2.01 ACCEPTABLE MANUFACTURER, MATERIALS AND COMPONENTS <br />A. Provide and install per-cast concrete manholes with covers as shown on <br />the drawings. <br />B. Manholes shall be as manufactured by the suppliers as shown on the <br />construction drawings . <br />C. Concrete <br />1. Plain and reinforced concrete used in structures, connections of <br />pipes with structures and the support of structures of frames shall <br />be 3,000 psi. <br />D. Frames and Covers <br />1. All frames and covers shall be of fabricated steel units. Stiffeners <br />used on covers shall transfer load directly to the frame. <br />2. All frames and covers shall be designed for H20 loading. <br />PART 3 EXECUTION <br />3.01 Excavation for Manholes <br />A. The Contractor shall do all excavation for manholes to the lines and <br />grades or elevations, shown on the plans, or as directed by the Engineer. <br />The excavation shall be of sufficient size to permit the placing of the full <br />width and length of the manholes as shown. The elevations as shown on <br />the plans, shall be considered as approximately only; and the Engineer <br />may order, in writing, changes in dimensions or elevations necessary to <br />secure a satisfactory foundation. <br />B. Boulders, logs, or any other objectionable material encountered in <br />excavation shall be removed. All rock or other hard foundation material <br />shall be cleaned of all loose material and cut to a firm surface either level, <br />stepped, or serrated, as directed by the Engineer. All seams or crevices <br />shall be cleaned out and grouted. All loose and disintegrated rock and <br />thin strata shall be removed. When concrete is to rest on a surface other <br />than rock, special care shall be taken not to disturb the bottom of the <br />excavation, and excavation to final grade shall not be made until just <br />before the manhole is to be placed. <br />C. The Contractor shall do all bracing, sheathing, or shoring necessary to <br />implement and protect the excavation and the manhole as required for <br />safety or conformance to governing laws. The cost of bracing, sheathing, <br />or shoring shall be included in the unit price bid for the structure.