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Preliminary Design Report Addendum No.2 <br />4.2.5 Rights -of -Way and Easements <br />Generally, it is desirable to install municipal pipelines in existing public ROW. Occasionally, it is <br />necessary to acquire permanent and temporary construction easements from private landowners to <br />accommodate a new utility. Acquiring easements may present costly and time - consuming challenges, <br />which can significantly delay a project. Easements and right -of -ways will be discussed later in the <br />description of each route. <br />Land records information including parcel/track boundary, easement, and ROW were obtained from the <br />Orange County Department of Public Works website. <br />4.2.6 Regulatory Requirements <br />The following regulatory agencies will have jurisdiction over the issuance of permits for design and <br />construction of the force main: <br />• Orange County Flood Control District — Encroachment Permit <br />• City of Newport Beach/City of Costa Mesa — Encroachment Permit <br />• Caltrans — Encroachment Permit <br />• Sewer — Orange County Sanitation District <br />• Sewer — Costa Mesa Sanitation District <br />• Electricity — Southern California Edison <br />• GAS — SC GAS <br />• Telephone — AT &T Distribution <br />• Cable —Time Warner Cable <br />• California Fish and Game Commission <br />4.2.7 Pipeline Design Criteria <br />The design flow for the Pump Station to discharge to the CMSD sewer collection system is 300 gpm in a <br />four -hour time window (PDR, Sept., 2012). It may be possible to design flow to be higher than 300 gpm <br />if it is to discharge directly to OCSD trunk main; this will be further addressed during later design phases. <br />Typical maximum and minimum velocity of the sewer pipe are 2 fps and 10 fps, respectively. The design <br />flow velocity for 300 gpm in the 8 -inch diameter pipe is 1.9 fps, which slightly lower than the minimum <br />velocity of 2 fps. A 6 -inch diameter pipe will be more suitable for the 300 gpm design flow with a <br />velocity of 3.4 fps. For routing evaluation purposes, a uniform 8 -inch diameter force main is used in this <br />study. Pipe material will be assumed to be high - density polyethylene (HDPE) for non - conventional <br />installation methods and ductile iron for conventional installation. Pipe installation methods are discussed <br />further below. <br />4.2.8 Pipe Installation Methods <br />The installation of the proposed reclaimed water main along each alternative can be achieved by different <br />construction methods. The following paragraphs will discuss the different methods available that can be <br />applied to this project and a recommendation will be presented based on the analysis performed. <br />URS 17 <br />25F -149 <br />