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Comprehensive Plan Sanitary Sewer Sub -Element feet of trench drainfield. Commercial septic tanks systems varyepending on estimated water use. . Since effluent from septic tanks is discharged to a drainfield where it is -A"^«XPa *^ percolates into the soil, soil permeability and depth to the water table are limiting factors for septic tanks s• ty em use. To ensure adequate performance and protection of groundwater quality, elevation of septic tanks em drainfields is often required. All OSTDS (septic system) permitting is done by the Florida Department of Health in Indian River County (DOH -Indian River). According to the IRCuT', Indian Diver-C-euhn4y -DOH-Indian River it is challenging to is d€f eult permit ^^yy in whiek to iffst l septic systems installations in the county aredue to several factors whieh aeEeunt €er th4s diffieulty. These f ^*^r^ areincluding: - a hi-gkwet season water table of less than 10 -inches as described in the USDA Soil Surveyf ,,,,a ; almost all areas of the , nt ; and • the presence of restrictive low permeable soil strata, • platted or recorded parcels less than 1/2 acre; and • setbacks from surface waters and/or wells. The areas of the county having "Excessively Drained Soils" and "Moderately Drained Soils" are better suited for septic tares systems. As shown on Figure 3.E.1 of the Stormwater Management Sub -Element, even these two soil types have limitations with respect to septic tank system suitability. While moderately drained soils have a severe limitation rating for septic tank -system suitability, excessively drained soils percolate so rapidly that they provide very poor filtration. Septic tanks systems on these soils have a potential for causing groundwater contamination. Areas of excessively drained soils in Indian River County are tvaically adiacent to waterbodies including canals, St. Sebastian River, and the Indian River Lagoon. Gttffent!-, the IRGHP The Florida Department of Health (DOH) establishes the rules for septic system permitting requires that a septietankasystefhave -a fnini ,,,.., of 42 ffie-hes- of vP�l Community Development Department Indian River County 20 Appendix A 318 -.% 070 ........... _11-10-0,01. .... . ...... The areas of the county having "Excessively Drained Soils" and "Moderately Drained Soils" are better suited for septic tares systems. As shown on Figure 3.E.1 of the Stormwater Management Sub -Element, even these two soil types have limitations with respect to septic tank system suitability. While moderately drained soils have a severe limitation rating for septic tank -system suitability, excessively drained soils percolate so rapidly that they provide very poor filtration. Septic tanks systems on these soils have a potential for causing groundwater contamination. Areas of excessively drained soils in Indian River County are tvaically adiacent to waterbodies including canals, St. Sebastian River, and the Indian River Lagoon. Gttffent!-, the IRGHP The Florida Department of Health (DOH) establishes the rules for septic system permitting requires that a septietankasystefhave -a fnini ,,,.., of 42 ffie-hes- of vP�l Community Development Department Indian River County 20 Appendix A 318