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1 <br />1 <br />than 8 persons/acre. The population density of the entire study area was <br />' 9.6 persons/acre, indicatingto the EPA that a central 1 collection system <br />' should be cost-effective. <br />4.3 WASTEWATER FLOWS <br />Wastewater flows for the proposed four Indian River County subregional <br />' treatment facilities and the Vero Beach Wastewater Treatment Plant (WWTP) <br />were taken from the Wastewater Master Plan Update (May 1987). These flows <br />' are presented in Table 4-3 and the total flows vary from an annual average <br />flow of 6.03 mgd in Year 1985 to a maximum month flow of 15.89 mgd in Year <br />' 2005. The areas served by these subregional facilities are shown on Figure <br />4-2. <br />' Flows were derived from population estimates developed in the Master Plan. <br />The population projections were based on on analysis of existing and <br />proposed dwelling unit counts, household size, and proposed land use. <br />Flows were estimated assuming a wastewater generation rate of 100 gallons <br />' per capita per day. <br />' Collection of wastewater within the County is accomplished by a system of <br />gravity sewers and pump stations. The County's pumping stations convey <br />tributary flow to the wastewater treatment plants through a force main <br />' system. <br />' Presently, all homes in the study area depend upon individual septic tanks <br />for wastewater treatment and disposal. The septic tanks may be located in <br />' the front, back, or side of the lot. <br />' Wastewater flows in 1972 are significant in determining EPA funding <br />eligibility. The ratio of 1972 flows to future expected flows must exceed <br />two-thirds, (see Section 5.4). Table 4-4 presents the estimated 1972 flows <br />' per block for the study area. <br />IRC.VB4 <br />6/4/87 <br />4-10 <br />