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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. - 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 cEounty's high wet season water table, this creates a high potential for groundwater and surface water contamination problems. Since 1983, F^r ��for new construction, the TD�DOH- has requiresd that the bottom of drainfields be at least 424 inches above the wet season water table-. To meet this requirement, fill .....,tori.,' or an ap r^ —ea RAnd fi _ypically slightly limited soil may be added to the site creating a mound. Also, a X75 foot separation requirement must be met between wells and/or waterbodies and septic systems. ^-i^r+ must be "'^+ When parcels platted or recorded after 1972 meet minimum lot size requirements Under- then nd the above conditions, septic system performance is considered adequate for developments within the cEounty. Another proble Tissue with septic systems is the possibility of wastewater septage lute effluent from a septics sy tem entering open bodies ^r 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 systems 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 tmderlying sedie herizen (a r-estr etive layer e€ten-eomprisede€sandy elay beam) and, thefe€ere, is not suitable for septie tan of design and eenstri etio , of septic to -W is considered to have restrictive low permeable soil strata not suitable for septic system installations - Community Development Department Indian River County 32 App33nodix A