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Preliminary Design Report Addendum No.2 <br />4.0 ALTERNAITVE PIPELINE ROUTE ANALYSIS <br />4.1 INTRODUCTION <br />4.1.1 Background <br />This section and subsections that follow present the process validation and selection approach, summarize <br />the five pipeline routing options that have been identified, and present the two recommended pipeline <br />routings for the Delhi Diversion Facility. <br />Per earlier investigation, the on -site sewer pipeline does not have the capacity for the additional flow from <br />the Delhi Channel. The harvested dry- weather flow from the Delhi Channel has to be sent to sewer <br />collection systems further downstream. Thus, URS investigated potential routes to connect the discharge <br />FM to potential locations, including the following: 1) connection to the local sewer collection system, <br />owned and operated by Costa Mesa Sanitary District (CMSD), which will also discharge to the OCSD <br />trunk main; and 2) direct connection to the OCSD trunk main further downstream. For both pipe routes, <br />the conveyed flow will ultimately be treated by regional wastewater treatment facilities. <br />4.1.2 Objective and Study Approach <br />The objective of this section is to summarize the investigations, in order to establish, evaluate, and <br />compare alternative routes for the proposed Diversion Facility sanitary sewer discharge force main (the <br />force main) and identify the most cost - effective pipeline route. The preferred alternatives will be based on <br />constructability and maintainability. A detailed approach has been implemented to identify the best <br />constructible route for the force main. This approach consists of the following major components: <br />• Identify potential pipeline route alternatives; <br />• Prepare preliminary cost for purposes of comparing the alternative routes; <br />• Perform a hydraulic analysis on the preferred route; <br />• Identify the preferred routes, considering the criteria ranking and costs. <br />This analysis reviews all project related information, such as digital aerial maps, Orange County Public <br />Works Records, easement descriptions, right -of -way (ROW) records, available utility system data, and <br />other pertinent information for an effective execution of the proposed project. <br />The objective of this analysis is to assist in identifying the most favorable route for the force main. It will <br />also serve as the document of record for technical support in later engineering decisions as the Project is <br />designed and constructed. <br />URS 15 <br />25F -147 <br />