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DocuSign Envelope ID:070B6BC7-CDE2-4AO8-BE62-07FA6BFDO53B <br /> 11/20/2020 <br /> 3.4 LANDSCAPING DRAINAGE INSTALLATION <br /> A. Landscape drainage shall be constructed as shown in the Drawings and per manufacturer <br /> recommendations. <br /> 3.5 PIPING INSTALLATION <br /> A. Install piping beginning at low points of system, true to grades and alignment indicated, with <br /> unbroken continuity of invert. Bed piping with full bearing in filtering material. Install gaskets, <br /> seals, sleeves, and couplings according to manufacturer's written instructions and other <br /> requirements indicated. <br /> 1. Foundation Subdrainage:Install piping level and with a minimum cover of 18 inches unless <br /> otherwise indicated. <br /> 2. Underslab Subdrainage: Install piping level. <br /> 3. Plaza Deck Subdrainage: Install piping level. <br /> 4. Retaining-Wall Subdrainage:When water discharges at end of wall into stormwater piping <br /> system, install piping level and with a minimum cover of 18 inches unless otherwise <br /> indicated. <br /> 5. Landscaping Subdrainage: Install piping pitched down in direction of flow, at a minimum <br /> slope of 1.0 percent percent and with a minimum cover of 18 inches unless otherwise <br /> indicated. <br /> 6. Lay perforated pipe with perforations down. <br /> 7. Excavate recesses in trench bottom for bell ends of pipe.Lay pipe with bells facing upslope <br /> and with spigot end entered fully into adjacent bell. <br /> B. Use increasers,reducers, and couplings made for different sizes or materials of pipes and fittings <br /> being connected. Reduction of pipe size in direction of flow is prohibited. <br /> C. Install thermoplastic piping according to ASTM D 2321. <br /> 3.6 PIPE JOINT CONSTRUCTION <br /> A. Join perforated PE pipe and fittings with couplings according to ASTM D 3212 with loose <br /> banded, coupled, or push-on joints. <br /> B. Join perforated PVC sewer pipe and fittings according to ASTM D 3212 with loose bell-and- <br /> spigot,push-on joints. <br /> C. Special Pipe Couplings: Join piping made of different materials and dimensions with special <br /> couplings made for this application.Use couplings that are compatible with and fit materials and <br /> dimensions of both pipes. <br /> 3.7 BACKWATER VALVE INSTALLATION <br /> A. Comply with requirements for backwater valves specified in Section 33 41 00 "Storm Utility <br /> Drainage Piping." <br /> 33 46 00 SUBDRAINAGE Page 3 of 4 <br />