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construct a dry line or wet line at the time of construction when the above criteria apply. ° Package treatment plants or other appropriate sanitary sewage treatment and disposal systems shall be allowed in areas of development outside of the 2010 Urban Service Area when such development meets the criteria of policies of the Future Land Use Element for: ° clustering of residential development within agricultural areas; ° clustering of residential development within privately owned upland conservation areas; or ° clustering development within mixed use districts. DATA AND ANALYSIS PAGE 68.2: ° A 1 unit per 2-1/2 acre density applied to the xeric scrub east of the St. Sebastian River (with clustering requirements) provides reasonable protection to the scrub and river, in combination with the 1 unit per 40 acre density (applying to the 125+ acres of wetlands) and a river/wetland setback buffer. The number of potential development units within the 300 acres of xeric scrub on the east side of the river is further reduced when one accounts for the approximately 125 acres of scrub already protected from development within the county's Donald McDonald Park and Boy Scout's Camp Oklawaha. The Indian River County Soil Survey identifies "Orsino fine sand, 0 to 5 percent slopes" as the soil associated with xeric scrub east of the St. Sebastian River. Relative to other soils in the county, Orsino fine sand is one of the better soils for septic tank absorption fields, with moderate limitations. Soil modifications, in combination with setback requirements from the river, would minimize ecological impacts associated with septic systems*. This issue will become moot over time on the east side of the river, however, as public sewer will completely serve the area by the year 2010 (see the Sanitary Sewer Sub -Element for reference information) . A conservation designation on the west side of the St. Sebastian River to provide resource protection would cover approximately 600 acres of xeric scrub, approximately 150 acres of wetlands border the river on the west side in the unincorporated county as well. The xeric scrub and associated wetlands on the west side of the river are presently undeveloped and largely undisturbed; the acreage is outside of the county's Urban Service Area (USA) . At a 1 unit per 2-1/2 acre density, the xeric scrub in this area would have a potential for a maximum of approximately 240 residential units. In that area that is outside of the USA, individual wells and septic systems would be prohibited in association with the residential units. To protect the watershed of the St. Sebastian River from any possible pollution, clustered residential development on privately -owned upland conservation areas would obtain potable water from privately owned public water treatment plants or centralized service, and would obtain sanitary sewage treatment from either package treatment plants, centralized community septic systems located outside of the xeric scrub area, other appropriate treatment and disposal systems, or from centralized sanitary sewer service . The county soil survey identifies "Electra sand, 0 to 5 percent slopes" as the soil associated with the scrub community west of the St. Sebastian River. The soil is classified as "somewhat poorly