Agenda - 10-21-1997 - 11a - Laserfiche WebLink

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Exhibit E-1. Summary of Management Scenarios for Further Public Consideration (Continued) 28 1-acre zoning in Alamance Co.,2-acre residential zoning in Orange Co.,with Zoning. a requirement for mandatory clustering in developments subject to the subdivision process. Houses would be clustered primarily on 1-acre lots. Open-space preservation is achieved in Orange Co.through a mandatory clustering requirement under the currently zoned density through a combination of smaller lots and open space. For 2-acre zoning,clustering on 1-acre lots(sufficient for septic drain fields)results in a net of 50% preservation in rural uses of a developable tract. On a site-by-site basis, Open-Space clustering on lots smaller than 1-acre with nondischarging community Preservation: wastewater systems maintained by OWASA might be allowed(see below), resulting in a greater percentage of open-space preservation. The open-space preservation program is assumed to be adopted within Orange Co.only,and, because mandatory clustering is required,it is assumed that additional voluntary open-space preservation will be negligible. As in other scenarios, the open space which is preserved is assumed to reflect the current proportions of forest and agricultural land uses in the watershed. -- Buffers: Current minimum requirements remain in place,but clustering can be used to maximize protection of riparian corridors and other sensitive areas. Within cluster developments,a structural BMP(e.g.,wet detention basin)is assumed to be present to serve the developed portion of the site. This would be paid for by the developer. The purpose of this BMP is primarily to control BMPs: first-flush washoff of pollutants from impervious areas,rather than provide effective sediment trapping,but a minor reduction in annual delivery of nutrients is also expected. Agricultural lands are assumed to follow current practices only,except that required animal operation BMPs are assumed to be in place. For this scenario,OWASA purchase/easement efforts place a higher emphasis on obtaining conservation easements. This higher participation in easements is achieved in part by assuming that a higher price will be offered Purchase/Easement: for easements than in other scenarios. It is also possible that OWASA may effectively create easements by purchasing land,then reselling it with deeded easements. The analysis of this scenario assumes 413 acres of fee simple purchase and 964 acres of conservation easement,for a total of 1377 acres (see footnote). The in-lake options for this scenario include OWASA construction of a In-Lake Opti osa: tributary detention basin on Caterpillar Creek and a detention basin on Water Fork(20 years from now)to reduce total nutrient and sediment load reaching the reservoir. Cluster development under this scenario may include alternatives for community wastewater systems(non-discharging)on a site-by-site basis, Other: with the condition of a strong OWASA involvement in the planning/design process and OWASA assumption of operation and maintenance. This option is assumed to apply to a relatively small portion of the total number of units in the watershed. E-13