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' DIVISION 02 Section 2711 Foundation Drainage Systems <br /> ' 3. Drainage Fill:Washed,evenly graded mixture of crushed stone,or crushed or <br /> uncrushed gravel,ASTM 0 448,coarse aggregate,Size No.57,with 100 percent <br /> passing 1-1/2-inch(37•5-mm)sieve and not more than 5 percent passing a No.8 <br /> ' (2.36-mm)sieve. <br /> ' PART 3. EXECUTION <br /> 3A1 EXAMINATION <br /> � A. Examine surfaces and areas for suitable conditions where foundation draining systems aze <br /> to be installed.Do not proceed until unsatisfactory conditions have been corrected. <br /> ' 1. Systems with 4-inch Piping:As follows: <br /> a. Perforated,polyethylene(PVC)pipe and fittings,couplings,and coupled joints. <br /> , B. Special Pipe-Coupling Applications:Use where required to join piping and no other <br /> appropriate method is specified. <br /> ' 3.01 INSTALLATION <br /> , A.Piping Installation:Drawing plans and details indicate general location and arrangement of <br /> foundation drainage system piping. <br /> ' 1. Install piping,beginning at low points of system,true to grades and alignment <br /> indicated,with unbroken continuity of invert. Bed piping with full bearing,solidly in <br /> filtering material. Install piping according to manufacturer's written instructions and <br /> other requirements indicated. <br /> ' 2. Install piping pitched down in direction of Ilow,at a minimum slope of 1 percent <br /> (1:100)and with a minimum cover of 36 inches(1000 mm),except where otherwise <br /> , indicated. <br /> 3. Lay open joint tile spaced as indicated on Drawings or,if not indicated,with 1/4 <br /> inch(6 mm)space between ends.Cover top 2/3 of joint opening with joint screening <br /> ' material and tie with corrosion-resistant wire. <br /> 4. Provide recesses in excavation bottom to receive bells of pipe bell ends.Lay pipe <br /> , with bells facing upslope and with spigot end entered fully into adjacent bell. <br /> 5. Apply and compact impervious fill material to raise low areas or where <br /> ' unsatisfactory bearing soil may occur. <br /> B. Use increasers,reducerss, and couplings made for different sizes or materials of pipes and <br /> t fittings being connected. <br /> C. Exbend piping to Catch Basin(drain tile on East side of salt sfiorage biulding shall drain <br /> infio catch basin identified as"CB.3"and drain tile on North side of salt storage building <br /> ' shall drain into catch basin identified as"CB.2") or fierminate piping in apron as <br /> indicabed at outfall shown on drawings-refer to drawings 2�28,and 9/28. <br /> ' Pa e 02711- 2 <br /> g <br /> HENNEPIN COt1NTY Orono Salt StoraQe <br /> , March 22,2002 Project No.:0031569 Contract No.:0751R2 <br />