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9 <br /> residential structures which are defined as existing <br /> development according to Article 6.23. 11a is allowed, <br /> Provided that the rebuilding or replacement does not result <br /> in an increase in the amount of impervious surface, and <br /> does not encroach any farther into stream buffers or <br /> setbacks from reservoirs than the Previous development. A <br /> structure which is rebuilt or replaced in accordance with <br /> these provisions is deemed conforming with respect to <br /> setbacks from streams and reservoirs required by Articles <br /> 6.23.7 and 6 .23.8 of this Ordinance. <br /> Existing Lots <br /> An existing lot, for the purpose of determining compliance <br /> with Article 6.23, is defined as a lot which was created <br /> prior to January 1, 1994. <br /> Stream buffers as required by Article 6.23.7, and setbacks <br /> for septic systems as required by Article 6.23. 8 may be <br /> reduced to the extent necessary to allow development of the <br /> lot, provided that all of the following criteria are met: <br /> 1. The septic system is sized to serve no more than four <br /> bedrooms; and <br /> 2. The septic tank, drainfield. and repair area (where <br /> required) can be accommodated on 20,000 square feet of <br /> area or less; and <br /> 3. The Orange County Planning Staff, in consultation with <br /> Orange County Environmental Health and/or the Orange <br /> ,County Engineer has determined that encroachment of the <br /> .structure into the stream buffer and/or encroachment of <br /> the septic system or repair area into the stream buffer <br /> or reservoir setback is necessary in order to provide <br /> adequate area for septic disposal and repair while <br /> maintaining required separations between wells, septic <br /> systems, structures and Property lines; and <br /> 4 . The Orange County Planning Staff, in consultation with <br /> Orange County Environmental Health and/or the Orange <br /> County Engineer, has determined that the relative <br /> locations of the well, septic system and structure <br /> maximize the amount of watershed shed protection that <br /> can be achieved while allowing development of the lot. <br /> Generally, an exception to setbacks for repair area is <br /> preferable to an exception for the initial septic <br /> system, and encroachment of structures or gravity <br /> septic systems into the setback is preferable to the <br /> installation of a septic system pump. <br /> 5. The amount of encroachment into the stream or reservoir <br /> buffer is the minimum amount which can be obtained <br /> while meeting the above criteria, <br />