25F - AGMT - DELHI DIVERSION PROJECT

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Preliminary Design Report Addendum No.2 Station can be further pumped to the Elden Pump station through a 14" FM and then ultimately discharge to the OCSD trunk main, which is the manhole upstream of the end connection points of Routes 1 and 2. This route begins at the proposed diversion facility location and proceeds west to cross under the Delhi Channel and continues southwest along the Delhi Channel within the Newport Beach Golf Course. The route continues within an existing Orange County sanitary sewer easement to the Irvine Avenue ROW and ends at an existing manhole located east of Irvine Avenue and north of Mesa Drive. Pipeline Length Route 3 is approximately 1,962 feet in length. Public Inconvenience & Safety Minor public inconveniences will occur within Route 3 when constructing along the roadway due to equipment placement, work vehicles, etc. The beginning of route 3 will also require that an easement be obtained from the Newport Beach Golf Course. The majority of the route is within ROW and will require minimal maintenance of traffic (MOT). There is also minimal impact due to reduced pipeline route length and the number of crossings of major intersections. Per earlier discussion with CMSD, which is the local sewer collection owner for Route 3, the existing CMSD system can take a maximum of 90,000 gallon per day discharge from the Delhi Channel with 300 gpm pumping capacity over the low peak time window from 12:00 pm to 5:00 am. Right of Way Availability Route 3 uses existing rights -of -way along the majority of the route. The following properties will need permanent construction easements acquired from private landowners: Newport Beach Golf Course, 20 feet wide by 250 feet long 20321 -20371 Irvine Avenue, 20 feet by 400 feet long (this study will consider existing the sanitary easement per OC parcel map no. 89 -128) Operation and Maintenance The existing Irvine Pump Station and Elden Pump Station will be impacted by additional flow from the Project. Although there is no change expected for the existing pump stations, these pumps will be running longer and start/stop more frequently, and thus could potentially increase the future operation and maintenance costs. There is extra operational cost associated with energy cost for pumping water three times before entering the OCSD trunk main along with the potential increased O &M cost for the existing CMSD sewer collection system. The energy cost will be addressed upon the completion of the hydraulic calculations of the preferred alternative routes. URS 22 25F -154