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19 <br /> Impact of proposed water and sewer boundary expansion in Southern Orange County on OWASA Water <br /> Distribution and Wastewater Collection Systems <br /> November 9, 2023 <br /> Page 3 <br /> The existing water distribution system extends south along Smith Level Road to the intersection of <br /> Highway 15-501 and Smith Level Road. The neighborhood of Heritage Hills is served by OWASA's <br /> existing system in this area; however, the distribution system is not 'looped' back along Highway 15-501 <br /> (connected with two-directions of water supply). Freese and Nichols considered the implications of <br /> additional new development in this area both with and without additional system looping along <br /> Highway 15-501 to analyze the differential impacts on system resilience. <br /> 1 _ Due to the decrease in available fire flow capacity <br /> noted above, additional looping was modeled to <br /> improve system resilience in this area assuming the <br /> ° .� 6 ma• • " ° ° _ high density scenario. Additional looping would <br /> consist of approximately 4800 lineal feet of <br /> era^ ��• b ' ..�.'..:.. <br /> additional 8-inch water main along Highway 15-501 <br /> ° to improve resilience to the area and restore fire <br /> ° flow availability under buildout conditions. Under <br /> •tip a the assumptions of the high density scenario, this <br /> looping is the only capital expenditure found to be <br /> ue necessary for the distribution system as a result of <br /> •'l feN�6.!!h S!Oi i <br /> �. the additional demand at a buildout condition. <br /> ems.. <br /> _ <br /> Figure 2—Distribution System Additional Looping <br /> Sewer Collection System <br /> CDM Smith conducted the gravity sewer analysis, adding the additional demands to the baseline <br /> buildout scenario, and determining impacts to collection system capacity under both dry weather and <br /> wet weather scenarios. <br /> Based on the assumptions listed in the Demand Projections section above, the expanded service area <br /> would generate an additional 113,000 to 213,200 gpd of flow (low and high density scenarios, <br /> respectively). To convey this additional flow, two new 8" diameter sewer outfalls would be required to <br /> be extending along the east and west side of Highway 15-501 from OWASA's existing system for <br /> approximately 7,700 lineal feet (combined total). Additional footage within the development area is not <br /> included in this total. <br />