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;Q3 k _tr a f 11 s A W <br />INFRASTRUCTURE <br />Water Plan <br />The City of Santa Ana is the primary provider of water services to the Specific <br />Plan area. Fxisbngwater mains in the area range from 4 inches to 12 inches in <br />diameter. There is a 12 -inch main that extends the length of Harbor Boulevard <br />in the Specific Plan area. The City of Santa Ana obtains 70% of its water from <br />City-owned wells, and any remaining demand is provided by the Metropolitan <br />Water District. Wells numbered 20, 21 and 30 provide water for the Specific <br />Plan area. Based on existing conditions and pipe sizes, water supply and <br />capacity is adequate to serve the Specific Plan area. Figure 5 -1 illustrates the <br />water system. <br />Sewer Plan <br />Currently, the Specific Plan area is served by a network of sewer lines ranging <br />from 8 -inch to 15 -inch diameter pipe. First Street and parts of Harbor Boulevard <br />have a 12 -inch mainline, while most of Harbor Boulevard is serviced by a <br />10 -inch mainline. McFadden Avenue is served by a 15 -inch mainline, and <br />the rest of the streets affecting the development are serviced by 8 -inch lines. <br />Additionally, near the Specific Plan area are two main trunk lines that carry <br />effluent to two treatment plants owned by the Orange County Sanitation District. <br />As the Specific Plan progresses towards its maximum buildout, future <br />calculated flows are expected to exceed current capacities and upgrades will <br />need to occur throughout the Specific Plan area Figure 5 -2 illustrates the <br />ultimate sewer system needed to serve existing and proposed development. <br />Drainage Plan <br />Runoff in the Specific Plan area is currently managed by a combination of <br />closed and open drainage channels, including a 90 -inch reinforced concrete <br />pipe that crosses Harbor Boulevard at Washington Street. A second large <br />closed drainage system is midway between First and Fifth Streets. All drainage <br />ultimately discharges into the Orange County Flood Control Channel. <br />During a 100 -year storm, the entire area is subject to flooding and will <br />continue to be until flood control elements are implemented. All buildings must <br />be constructed three feet above the location of recorded 100 -year flood plains <br />in any Zone A (100 year flood zone) land south of Hazard Avenue. The lowest <br />flood levels are at the 79' and 84' contour levels for the area north of Hazard <br />and Westminster Avenues. <br />A 1993 study (Boyle Engineering Report) indicated that the existing system is <br />deficient and unable to convey current runoffs. Additionally, the Harbor Corridor <br />Plan would add impervious area to the corridor — primarily from developing <br />vacant land —and would increase existing flows by 15 %. An updated drainage <br />master plan should be completed by the end of 2014. <br />Figure 5 -3 illustrates the existing and proposed storm drainage system for the <br />Harbor Corridor Plan area The map distinguishes between recommendations <br />made in the 1993 study that would need to be implemented to convey existing <br />runoff and improvements required to accommodate increases generated by the <br />Harbor Corridor Plan. <br />Harbor Mixed Use Transit Corridor Pan <br />October 2014 5 -1 <br />