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Comprehensive Plan Sanitary Sewer Sub -Element There are many areas of the county in which existing subdivisions contain lots which do not meet the minimum acreage requirements for well and septic tank systems. Nevertheless, residential lots that do not meet those standards may be able to utilize septic tank systems without increased health risks or increased probability of groundwater contamination if soil and groundwater conditions are favorable. That is particularly applicable to residential lots that are connected to the regional potable water system. Table 3.A.3 lists subdivisions in the county urban service area with increased health risks and/or increased probability of groundwater contamination associated with continued septic tank system use. Like regional and private wastewater treatment facilities, septic systems also produce effluent and a solid by-product called septage. While septic tank effluent is discharged into a drainfield and percolates into the groundwater, the septage is deposited in the septic tank. Periodically, the septage must be removed from the tank. For residential septic systems, the interval between removal is typically three to five years. For land uses which generate large quantities of wastewater, the interval between removal times may be as frequent as once a month. The size of the septic tank, however, also influences how often removal occurs. When septage is removed from septic tanks, private contractors must haul the septage to the county's sludge and septage disposal facility at the county landfill. TABLE 3.A.3 INDIAN RIVER COUNTY SUBDIVISIONS WITH INCREASED HEALTH RISKS AND/OR INCREASED PROBABILITY OF GROUNDWATER CONTAMINATION ASSOCIATED WITH CONTINUED SEPTIC TANK SYSTEM USE 1. Oslo Park 2. Paradise Park 3. Stevens Park 4. Durrance Place Source: Indian River County Health and Utilities Departments Community Development Department Indian River County 21