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A legible drainage area map must accompany the calculations, with <br />each drainage area, point of concentration and storm pipe clearly <br />labeled, and similarly labeled in the calculations. <br /> <br />D. Sanitary Sewer System: The existing and proposed sanitary <br />sewer facilities must be shown. Sizes and types of existing <br />pipes must be labeled. Invert and rim elevations at each <br />structure must be shown. <br /> <br />The proposed pipe sizes, slopes, and lengths between structures <br />must be shown. The pipe invert elevations must be labeled at <br />each structure along with the proposed rim elevation for each <br />structure. <br /> <br /> 1. Structures: Details must be shown for all structures <br /> if City Standard Manholes are not specified. All structures <br /> to be in traffic areas must be strong enough to resist <br /> vehicle loads. Cleanouts and/or manholes must be placed at <br /> spacing specified in Chapter 11 of the UPC. <br /> <br /> 2. Pipe: Pipe depths to finish grade and/or subgrade must <br /> be in conformance with the specifications of the pipe <br /> manufacturer. Pipe type need not be shown on the plans. <br /> Pipe type may be any type of pipe permitted in Chapter 11 <br /> and in IAPMO IS 1-76 of the UPC, except that, where certain <br /> pipe types were not allowed in the public main which serves <br /> the site, the same pipe types will not be allowed in the <br /> onsite system. Joints and connections shall be as specified <br /> in Chapter 8 of the UPC. <br /> <br /> Where the distance between a sanitary sewer pipe and another <br /> pipe will be less than a nominal six (6) inches at a pipe <br /> crossing, or where the sanitary pipe will be on top at a <br /> pipe crossing (regardless of the clearance), the sanitary <br /> sewer pipe must be ductile iron pipe if on the bottom, or <br /> ductile iron pipe or PVC if on the top. If 6n the top, the <br /> sanitary pipe must have a 20' foot continous length centered <br /> over the bottom pipe. <br /> <br /> Minimum pipe slopes for each pipe size shall be as specified <br /> in Chapter 11 of the UPC unless the Architect or Engineer <br /> can show by calculations that a lessor slope will result in <br /> flow velocities of a minimum of 2 feet per second. If a <br /> pipe is to be installed at a slope of 1% or flatter, or if <br /> the slope is less than that minimum slope specified in the <br /> UPC for that particular size pipe, its location must be <br /> staked by a Civil Engineer or Land Surveyor and cut sheets <br /> must be presented to the City inspector prior to pipe <br /> installation. <br /> <br /> 14 <br /> <br /> <br />