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v. SYSTEM ANALYSIS AND DEVELOPMENT A. Wastewater Flow Originally the wastewater system alternatives were based on a projected growth in the basin that assumed a 53% buildout population for the Lowmansf Ranch and Cottonwood Creek Park developments by the year 2005. After further discussion with the City of San i\larcos and the Lowmans I Ranch development, it was decided to derive additional population proportions and flows based on 100% ultimate buildout for the two developments by the year 2005. The remainder of the 'casin projected population ~";as adjusted to keep the total basin popula:.:on constant. Using the cost-effective alternative from the original population projections as a basis for design, a new alternative (Alternative 6) was derived with revised component sizing, which then became the proposed alternative (Appendix J). B. Proposed System Initially a gravity flow interceptor line is proposed along Cottonwood Creek from IH -35 to the eastern point of the intersection of sub-basins 1 and 2 (Figure 4). This line will service all of sub-basins 1 anà 2 and is sized for the 2005 projected two-hour peak wet weather flow. At the downstream end of this interceptor a lift station (hereinafter called the central lift station) is proposed to be constructed in Phase I. This lift station will be sized to pump the projected two-hour wet weather peak flow for sub-basins 1 and 2 through the year 1990. A force main pipeline will be constructed from the central lift station to the existing wastewater treatment plant. The force main will be sized to carry the projected two-hour peak wet weather flow from sub-basins 1 and 2 for the year 1990 at a velocity of no more than five feet per second. JONES ð "IEUSE , i I I I I ~ 19