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' <br />8.0 PRELIMINARY DESIGN <br />8.1 GENERAL <br />Previous sections of this report have presented the development, land use, <br />population, and corresponding estimated wastewater flow quantities on a per <br />block basis for the unsewered study area in Indian River County. The <br />' <br />recommended plan is for providing a grinder pump -pressure collection <br />system. The flows will be collected and transported to the Vero Beach <br />' <br />Wastewater Treatment Plant. <br />8.2 DESIGN CRITERIA <br />8.2.1 WASTEWATER FLOWS <br />Wastewater flows in the study area are entirely domestic. Residential <br />' <br />flows are based on a "per capita" factor. Experience in Indian River <br />County indicates that 100 gallons of wastewater per capita per day (gpcd) <br />' <br />represents a reasonable rate for the average daily flow (ADF) in <br />residential areas. In addition, this factor was verified for Indian River <br />County in its Comprehensive Plan. <br />8.2.2 DESIGN LAYOUT <br />Figure 8-1 shows a schematic layout of a manifolded system of small PVC <br />' <br />force mains 2- to 3 -inches in diameter. The small PVC force mains would be <br />constructed within the existing backyard easement areas which presently <br />' <br />accommodate the existing potable water supply system serving the Rockridge <br />project service area. <br />' Each dwelling unit would be furnished with an arrangment as shown on the <br />Dwelling Grinder Pump Typical Installation Detail on Figure 8-2. It is <br />' proposed that the sewer contractor would remove the existing septic tank <br />' IRC:VB4 <br />6/4/87 <br />' 8-1 <br />