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H <br /> 0 <br /> necrnlnmmnn h Cnnei,1 hi nn <br /> T n <br /> August 10,2011 (Revised August 23,2011) <br /> Lyle Oman <br /> Tom Kellogg,PE <br /> c/o The City of Orono <br /> 2750 Kelley Parkway <br /> Long Lake,MN 55356-9387 <br /> Re: Orono Senior Housing <br /> Gentlemen, <br /> The approved plans for the Orono Senior Housing project include provisions to use directionally <br /> drilled polyethylene pipe (PEP) for the forcemain and watermain within the site. Since these lines <br /> will be privately maintained they fall under the Minnesota Plumbing Code,which does not <br /> specifically list PEP as an approved material. Therefor the Minnesota Department of Labor and <br /> Industry has required us to submit this written request to the City of Orono to specifically allow this <br /> alternative material and installation method. <br /> We propose to install the PEP by Horizontal Directional Drilling in conformance with ASTM <br /> F1962- 11 "Standard Guide for Use of Maxi-Horizontal Directional Drilling for Placement of PE <br /> Pipe or Conduit Under Obstacles,Including River Crossings". The pipe joints will be butt fused in <br /> the field following ASTM F2620—09e1.The pipe material should be dimensioned and <br /> manufactured according to ASTM F 714-05,and meet the requirements of ANSI/AWWA C 906- <br /> 2006 Polyethylene Pipe and Fittings,4 in(100 mm)Through 63 in(1,575 mm) for Water <br /> Distribution. <br /> Please sign below and return a copy of this letter to me indicating that these materials and <br /> installation methods are acceptable. If you have any questions or need any additional information <br /> please give me a call. <br /> Best regards, <br /> Ir <br /> f / <br /> Steve Johnston,PE <br /> cc: Jim Beckwith,Krause Anderson Construction <br /> Matt Alexander,Kraus Anderson Realty <br /> Approved: <br /> By: •Sid <br /> l 0 OAi(1 Qv4L.dfnt O,hCt,k( Date 9 -2' " r2 1 t <br /> J <br /> RHO Development Consulting,Inc. <br /> PO Box 357,Long Lake,MN 553546-357 p/(612)382-4804 f/ (952)476-0876 www.RHOdevelopment.com <br />