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Comprehensive Plan Sanitary Sewer Sub -Element instead, The county must establish criteria to differentiate between areas where retrofitting is required_ and afeas where fetrefitting is allowed.—Because of the cost of retrofitting projects within the urban service area is , the most appropriate criteria to use to identify areas to retrofit are increased health risks and increased groundwater and/or surface water contamination risks. When any of the following conditions exist and the DOH -Indian River verifies that the health and groundwater contamination risks cannot be sufficiently reduced by any means other than connecting to the regional system, retrofitting must occur. Areas with small lot sizes less than '/4 acre especially those constructed prior to 1983. Whefe units are not eennee4ed te a fegienal petable water- system, this r-efer-9 te lets of 17/Z Residential subdivisions that meet those criteria are identified in Table 3.A.3. Areas with intense land uses. Intense land uses means commercial,/_industrial or equivalent uses or residential uses greater than 6 units/acre. • Environmentally Sensitive Areas. This means areas within 500 feet of aquifer recharge zones, as identified in the Aquifer Recharge Sub -Element of this plan; within 500 feet of any public water supply well; within 500 feet of the Indian River Lagoon, the St. Sebastian River, or any body of water that drains into them. • As identified in the 2017 Septic to Sewer Study: Evaluation and Ranking by Utilities. • Areas identified by the DOH -Indian River -as potential threats to public health-er • New developments on oceanfront and riverfront lots For planning purposes, a history of septic tank f-e-iluresystem repairs is defined as follows: For subdivisions of 10 or fewer lots, this means 20% failures in five years. For subdivisions of 11 to 75 lots, this means 10% failures in eight -five years. For subdivisions of more than 75 lots, this means 2% failures in ten -five years. Residential subdivisions that meet thew -iter^ entified in Table 3.A.-3-. Methods that allow for a higher level of effluent treatment and reduction of contamination include: linstallation of a "performance based system", providing a 24 inch separation between the bottom of the drainfield and the wet season water table, and providing at least a 75 foot setback between septic systems and wells and/or surface waterbodies. Generally, the most effective and efficient way to correct the wastewater problem of those subdivisions is to connect them to the regional system. Other eptiens eeeld involve adding fill an". r- pumping -the wastewater te anether- septic tank. Although the easts and effeetiveness of these options vafy Community Development Department Indian River County 34 Appendix A