Ord 1987-020 - Laserfiche WebLink

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1. SUMMARY This report was prepared to evaluate several wastewater system alternatives for the Cottonwood Creek watershed area, south and southeast of San :Ylarcos. The system was to be designed with consideration given to the needs of two major proposed developments in the watershed. These developments are Lowmans t Ranch MUD and Cottonwood Creek Park. The report evaluates several alternatives for wastewater service, estimates the costs of these alternatives, and allocates the proportional cost snare of the facilities to each of the developments and the City of San :\1arcos. This report also describes the environmental setting for the study area. Because of the natural slope of the study area, gravity flov...- interceptors can be used to collect the wastev"ater effectively. Because of this', the first alternative considered included a system of gravity flow interceptors and combinations of pump stations, force mains, and treatment plant locations. .~ternatives were evaluated to compare pumping the collected wastewater to the existing WWTP versus building a new WWTP. Locating the lift stations in several different locations was evaluated which enabled the use of different sized force main lines. The cost of each alternative was evaluated to determine the best alternative solution. The flows used to size the wastewater facilities were based on projected population growth in the basin. Alternatives 1 through 5 were based on a projected 53 percent buildout of the Lowmans' Ranch and Cottonwood Creek Park developments for the year 2005. Alternative 6 was developed assuming that the population of the Lowmans 1 Ranch and Cottonwood Creek Park developments would increase to achieve 100 percent buildout by the year 2005. The flow for the rest of the basin was adjusted to allow the total basin flow to remain the same for all alternatives. The JO!'iES ð: NEUSe: i .J