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8 <br /> a. Provide assistance in terms of "up-front" <br /> subdivision and individual site design to assure <br /> compliance. <br /> b. Provide for exceptions where technical solutions <br /> are provided to deal with runoff. Such solutions <br /> could include, among others, porous paving, dutch <br /> drains, dry wells, etc. They would, however, <br /> require the development of specifications for such <br /> devices and the evaluation of proposed solutions by <br /> the County Engineer and Planning Staff. <br /> c. Require the developer/owner to provide lot sizes <br /> large enough to accommodate the type of housing <br /> unit and accessory uses desired. <br /> 2 . Increase the impervious surface ceiling. <br /> The "worst case" scenarios in terms of meeting the <br /> impervious surface limits involved lots with public road <br /> frontage, building, coverage of 2500 sq.ft. , and, long <br /> driveways. The amount of impervious surface in these <br /> situations ranged from 5 .57% to 6 . 11% for 5-acre lots <br /> and 10 .93% to 11 .97% for 2-acre lots. <br /> By increasing the impervious surface ceiling from 4% to <br /> 6% for 5-acre lots, and from 6% to 12% for 2-acre lots, <br /> the number of development scenarios able to comply <br /> increases from 60% to 99% for 5-acre lots and from 30% <br /> to 100% for 2-acre lots . <br /> If this alternative is used, it would be desirable to <br /> have a sliding scale of impervious surface limits rather <br /> than broad categories for 5+ acre lots, 2-5 acre lots, <br /> etc. A sliding scale such as the one shown on Attachment <br /> T would avoid situations where a 4 .9 acre lot would be <br /> permitted a 6% limit and a 5-acre lot would have to <br /> comply with a 4% limit. The sliding scale shown also <br /> accounts for lots less than 2 acres in size. Such lots <br /> represent existing lots and constitute 7% of the <br /> watershed land area. <br /> 3. Discount unpaved road surfaces with CDM standards. <br /> Presently, unpaved roads are not included in impervious <br /> surface calculations If this practice were continued, <br /> the number of development scenarios able to comply would <br /> increase from 60% to 76% for 5-acre lots and 30% to 55% <br /> for 2-acre lots. <br /> 4 . Discount all unpaved surfaces, including road <br />