25F - AGMT - DELHI DIVERSION PROJECT

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Preliminary Design Report Addendum No.2 4.2 BASIC DATA 4.2.1 Introduction In order to compare and evaluate suitable alternative pipeline routes, it is necessary to acquire a variety of information or basic data on existing and proposed conditions. Comparative evaluations of the alternative routes include the development of probable construction costs, land acquisition costs, and where applicable, additional design costs. Other pertinent criteria, which are not readily cost identifiable, have been assessed by means of an evaluation matrix. This matrix will be discussed later in the study. 4.2.2 Route Study Area A route study area is the area within which alternative routes from Point A to Point B are developed. In this alternative study, Point A is at the proposed Delhi Channel Diversion Facility's Pump Station and Point B includes the connection points to existing sewer conveyance systems at various potential locations, as described in Section 4.3. 4.2.3 Aerial Photographs Aerial photography is necessary in pipeline route selection to identify highways, railroads, environmentally sensitive lands, density of development, waterways, and other natural and man -made features visible from air. For this alternative study, the aerial photos covering the route study area were obtained from Google Earth Pro. 4.2.4 Existing Utility Data Information on existing public utilities, particularly underground utilities, is required to identify pipeline routes that will result in minimizing potential utility conflicts during construction. Existing large diameter sanitary and storm sewers, sanitary force mains and water mains are usually the greatest concern. Other utilities, including buried communications lines, gas mains, and power lines are also important, but are typically much smaller in diameter than sewers and water mains. Consequently, they do not have a significant impact on route selection, as it is comparatively easy to avoid these utilities or at least provide adequate clearance for their protection during construction. The locations of above - ground power and communications lines can affect route selection. The following utility agencies maintain existing utilities with the alternative route corridors: • Water — City of Newport Beach • Water — City of Costa Mesa • Sewer — Orange County Sanitation District • Sewer — Costa Mesa Sanitation District • Electricity — Southern California Edison • GAS — SC GAS • Telephone — AT &T Distribution • Cable — Time Warner Cable I= 16 25F -148