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water supply classification, the most protective classification avails..__ <br /> from the State. Participation of all watershed jurisdictions in the <br /> nonpoint pollution management program is required to secure a WS-I <br /> classification from the State. A WS-I designation will reinforce the local <br /> nonpoint pollution management programs in that it will prohibit any point <br /> sources from being permitted in the watershed. In addition, a region with <br /> a water supply singled out by the State for its exceptional water quality <br /> and the highest possible level of protection is likely to have an edge in <br /> recruiting the new clean industries which most jurisdictions covet. <br /> 8.4 NONSTRUCTURAL CONTROLS <br /> 8.4.1 LAND USE CONTROLS <br /> • <br /> Restrictions on density and imperviousness represent the preferred approach <br /> to watershed management. For those jurisdictions which elect to rely in <br /> 'jk whole or in part upon land use controls, a 2-acre minimum lot size for <br /> single family residential development is the optimum restriction. In order <br /> to be effective at managing future nonpoint pollution impacts, the 2-acre <br /> . lot requirement must be accompanied by a 6% -imperviousness ceiling: -To <br /> ensure adequate water supply protection with land use controls alone, a <br /> minimum residential lot .size of 2 acres (6% imperviousness) should ideally <br /> be maintained throughout both watersheds. In recognition of -the-fact -that <br /> /this may not be feasible, a critical zone where land use controls are most <br /> —j desirable has been identified (see Figure 3-3) . It is recommended that <br /> land use controls be the method of choice_-withinthe-_critidal zones, and_ <br /> that intensive urban.development be discouraged in_this areal-intensive • <br /> development is more suitable for the least critical zones in the watershed <br /> headwaters. Land use controls should also predominate within the tran- <br /> sitional zone in the middle of each watershed (i.e. , area between most <br /> critical zone and least critical zone) . <br /> Jurisdictions which rely upon land use controls should still require <br /> structural BMP's for all development more intensive than a 2-acre single <br /> family residential lot size, including multi-family residential, <br /> commercial, industrial and institutional land uses. The maintenance _ _ <br /> 8-4 <br />