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Comprehensive Plan Sanitary Sewer Sub -Element <br />Tte4,-41he county must establish criteria to differentiate between areas where retrofitting is <br />required_ . Because of the cost of retrofitting projects <br />within the urban service area is felafively eens4ant—,the most appropriate criteria to use to identify <br />areas to retrofit are increased health risks and increased groundwater and/or surface water <br />contamination risks. When any of the following conditions exist and the 1DDOH-Indian <br />River verifies that the health and groundwater contamination risks cannot be sufficiently reduced <br />by any means other than connecting to the regional system, retrofitting must occur. <br />a --Areas with small lot sizes less than '/4 acre especially those constructed prior to 1983. <br />♦♦ IILiZ {. L[IIILS-RIti not eenneeted te a r-egienal potable water system, <br />this fefer-S to lots of 17� <br />aefe ef less.Residential subdivisions that meet those criteria are identified in Table 3.A.3. <br />Areas with intense land uses. Intense land uses means commercial.,Lindustrial or <br />equivalent uses or residential uses greater than 6 units/acre. <br />Environmentally Sensitive Areas. This means areas within 500 feet of aquifer recharge <br />zones, as identified in the Aquifer Recharge Sub -Element of this plan; within 500 feet of <br />any public water supply well; within 500 feet of the Indian River Lagoon, the St. <br />Sebastian River, or any body of water that drains into them. <br />• As identified in the 2017 Septic to Sewer Study: Evaluation and Ranking by Utilities. <br />Areas identified by the DOH -Indian River 7U�as potential threats to public health <br />• New developments on oceanfront and riverfront lots <br />For planning purposes, a history of septic tank failtifesystem repairs is defined as follows: <br />For subdivisions of 10 or fewer lots, this means 20% failures in five years. For subdivisions of <br />11 to 75 lots, this means 10% failures in eight- ive years. For subdivisions of more than 75 lots, <br />this means 2% failures in ten -five years. Residential subdivisions dia4 fneet these efitefia are <br />identified in Table 3.A.3--. <br />Methods that allow for a hiaher level of effluent treatment and reduction of contamination <br />include: (installation of a "performance based system", providing a 24 inch separation between <br />the bottom of the drainfield and the wet season water table, and providing at least a 75 foot <br />setback between septic systems and wells and/or surface waterbodies. Generally, the most <br />effective and efficient way to correct the wastewater problem of those subdivisions is to connect <br />them to the regional system. Other options eould involve adding fill and/of pumping the <br />Community Development Department Indian River County 34 <br />Appendix A <br />