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

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26 Exhibit E-1. Summary of Management Scenarios for Further Public Consideration Scenario l: Tributary Detention This scenario emphasizes OWASA in-take(or near-lake)efforts to protect water quality through the construction of sub-watershed scale tributary detention facilities near the mouths of the major tributaries(ranging in size from 10-43 acres). Management options on the watershed are minimized,resulting in minimal burden on watershed landowners. Zoning: Currently zoned for 2-acre minimum lots in Orange Co., I acre in Alamance Open-Space Voluntary open-space preservation under current ordinance,resulting in a net Preservation: 10%preservation of existing rural land uses in Orange County and 6%in Alamance County. Buffers: Current requirements. BMPs: Current practices only,except that animal operation BMPs required by state regulations are assumed to be in place. Current OWASA land purchase funds plus additional funds,as required,are Purchase/Easement: diverted to the cost of acquiring sites and constructing tributary detention facilities. No additional land is acquired beyond that needed for construction of tributary sub-impoundments,due to the high cost of these facilities. Regional sub-impoundments to trap pollutant loads are constructed near the mouth of four of the five major tributaries(Caterpillar Creek,Watery Fork, In-Lake Options: Cane Creek,Turkey Hill Creek). No detention facility is planned for Toms Creek because of construction costs and difficulties associated with currently existing Apple Mill Pond,which does not provide any discernable water quality benefits. Scenario 4a: 10%Preservation of Open Space Combined with Additional BMPs This scenario combines planned open-space preservation with relatively little restriction on use of the remaining land. Current 2-acre zoning would be maintained,except in the central area nearest the lake. To compensate for the increased pollution load generated by 2-acre development, structural stormwater controls for new development are included in the mix of BMPs. It is also assumed that Alamance Co.will continue to allow development under the state's minimum watershed protection rules. This scenario includes voluntary open-space preservation and one tributary detention basin on Caterpillar Creek. Zoned for residential development at 2 acres in Orange Co.,with zoning of Zoning 5 acres with 2-acre option in nearshore critical area,and 1 acre in Alamance Co.on buildable areas. Buffers: Current requirements. Open-Space Voluntary open-space preservation resulting in a net 10%preservation of Preservation: existing rural land uses in Orange County and 6%in Alamance County. E-11