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