25F - AGMT - DELHI DIVERSION PROJECT

Home Browse Search

Preliminary Design Report Addendum No.2 diameter shall be encased. The recommended minimum depth of cover for 8" to 14" diameter pipeline using HDD technology is 6 feet. In this study, a 20" diameter case for 8" FM has been assumed. 4.3 ALTERNATIVE PIPELINE ROUTES 4.3.1 General Five alternative sewer discharge FM pipeline routes from the diversion facility to the possible City /County existing sewer collection connection points were identified and evaluated to determine the best overall route. The location map for the five alternative routes is depicted in Exhibit A. Routes were identified based on field observations, analysis of existing sewer collection system network data, and traffic conditions. Both cost and non -cost (feasibility of construction and minimization of public disruption) were considered in the selection of the routes. The five alternative routes are called: • Route 1 • Route 2 • Route 3 • Route 4 • Route 5 These route corridors, plan (1:2400 scale), and profiles are on PD-4 to PD -19 in Appendix A -1 4.3.2 Description of Alternative Routes Route 1 The limits of Route 1 begin at the proposed Delhi Channel Diversion Facility Pump Station and end at the existing OCSD's 27" diameter trunk main located on the east side of Fairview Road near Fair Drive intersection. The proposed FM connection is through an existing manhole. This route begins at the proposed diversion facility location and proceeds west to cross under Delhi Channel and continues southwest along Delhi Channel within the Newport Beach Golf Course. The route continues within an existing Orange County sanitary sewer easement into the Irvine Avenue ROW. The route continues south within the Irvine Avenue ROW to Mesa Drive, then continues west within the Mesa Drive ROW, crossing Santa Ana Avenue to Newport Boulevard ROW, and then crossing Newport Boulevard through the bridge's existing utility crossing structures, and continues west to Fair Drive ROW and then ends at an existing manhole located on the east side of Fairview Road. Pipeline Length Route 1 is approximately 10,442 feet in length. Public Inconvenience & Safety Medium level of public inconveniences will occur within Route 1 when constructing along the roadway due to equipment placement, work vehicles, etc. The beginning of route 1 will require that an easement be obtained from the owner of the Newport Beach Golf Course and an existing sanitary sewer easement will be used. The majority of the route is within ROW and will require maintenance of traffic (MOT). When URS 19 25F -151