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Comprehensive Plan Sanitary Sewer Sub -Element areas with a high concentration of commercial/industrial use, and areas with construction that predates 1983.7 According to the United States Department of Agriculture's Soil Conservation Service, Soil Survey most of Indian River County's soil has severe limitations for the use of septic tank systems. Combined with the cGounty's high wet season water table, this creates a high potential for groundwater and surface water contamination problems. Since 1983, Fer��4or new construction, the 1R£13DOH- has requiresd that the bottom of drainfields be at least 42-24 inches above the wet season water table-. To meet this requirement, typically slightly limited soil may be added to the site creating a mound. Also, a minimumr75 foot separation requirement must be met between wells and/or waterbodies and septic tank -systems. dr-ainfields and a minimum lot size t must be fnec When parcels platted or recorded after 1972 meet minimum lot size requirements i Thaor theseand the above conditions, septic tun—system performance is considered adequate for developments within the cGounty. Another Keble issue with septic systems is the possibility of wastewater- septag_e leae-hate effluent from a septic tank s sy tem entering open bodies of water- waterbodies in the cGounty. This problem must be examined carefully, especially on the barrier island, in areas near the Indian River Lagoon, in areas near the St. Sebastian River, and in areas adjacent to canals, lakes or wetlands. To summarize, the problems with septic lsystems are listed below: • Physical limitations existing in Indian River County o A high water table of less than 10 inches as described in the USDA Soil Survey is found in almost all areas of the county, especially during the months of the wet season June through October. o Ninety-three percent of the county's soil has an under -lying spedie her-izen (a restr-ietive layer- eften eempr-ised of sandy elay loam) and, therefore, is not suitable fer- septie tanks. This problem ean be solved in areas with a low fesidential density by seme fnedifieatien of design and eenstmetion of septie is considered to have restrictive low permeable soil strata not suitable for septic system installations. Community Development Department Indian River County 32 Appendix A