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Comprehensive Plan Sanitary Sewer Sub -Element <br />feet of trench drainfield. Commercial septic tanks systems vary depending on estimated water <br />use. Since effluent from septic tanks is discharged to a drainfield <br />where it is allowed to percolates into the soil, soil permeability and depth to the water table are <br />limiting factors for septictank s sy tem use. To ensure adequate performance and protection of <br />groundwater quality, elevation of septic tissy tem drainfields is often required. All OSTDS <br />(septic system) permitting is done by the Florida Department of Health in Indian River County <br />(DOH -Indian River). <br />According to the DOH -Indian River it is challenging totes -a <br />di permit septic tank -systems installations in the county . Thefe <br />afedue to several factors whieh aeeeunt for- this difnettity. These faeter-s ar-eincluding: <br />0 a highwet season water table of less than 10 -inches as described in the USDA <br />Soil Survey ; and <br />•soil eenditiefis eensisting of an under -lying hardpan stfata in mueh of the eeunty. <br />the presence of restrictive low permeable soil strata, <br />• platted or recorded parcels less than V2 acre; and <br />• setbacks from surface waters and/or wells. <br />- <br />- <br />- <br />ON <br />The areas of the county having "Excessively Drained Soils" and "Moderately Drained Soils" are <br />better suited for septic systems. As shown on Figure 3.E.1 of the Stormwater Management <br />Sub -Element, even these two soil types have limitations with respect to septic tank system <br />suitability. While moderately drained soils have a severe limitation rating for septic tank --system <br />suitability, excessively drained soils percolate so rapidly that they provide very poor filtration. <br />Septic tanks systems on these soils have a potential for causing groundwater contamination. <br />Areas of excessively drained soils in Indian River Countv are tvpically adiacent to waterbodies <br />including canals, St. Sebastian River, and the Indian River Lagoon. <br />The Florida Department of Health (DOH) establishes the rules for septic <br />system permitti"Mr-equir-es that a septie tank system have a mininium ef 42 inehes of well <br />Community Development Department Indian River County 20 <br />Appendix A <br />