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26 <br /> maximum density of one ( 1) unit per five (5) acres for <br /> any development. Cluster subdivisions with lot sizes <br /> of not less than one ( 1) acre are also allowed as well <br /> as the creation of a limited number (5) of two-acre <br /> lots . As an alternative to the latter provision, the <br /> number of new two-acre lots which can be created may be <br /> limited to two (2 ) in order to maintain higher water <br /> quality levels . Development standards for impervious <br /> surface coverage; stream buffers; placement of streets, <br /> driveways, and buildings; and water supply/sewage <br /> disposal facilities are also proposed. <br /> The CDM study recommended a four percent (4%) <br /> impervious surface limitation for five-acre lots, while <br /> the proposed 13-point agreement of the Watershed Work <br /> Group included a four percent (4%) limit for five-acre <br /> lots, six percent (5%) for two to five-acre lots, and <br /> twelve percent ( 12%) for lots smaller than two acres. <br /> A more workable six percent ( 6%) ratio has been <br /> proposed by the Orange County Planning Department for <br /> five-acre lots. To account for lots larger than five <br /> acres, existing lots of less than five acres, and the <br /> limited number of two-acre lots which may be created, a <br /> sliding scale of impervious surface ratios is proposed, <br /> ranging from four percent (4%) for six-acre lots to <br /> fifteen percent ( 15%) for half-acre lots . <br /> Option 42 is, based on the structural best management <br /> practice approach recommended by CDM. The provisions of <br /> Option #2 are similar to Option #1 except that a <br /> minimum lot size of two (2 ) acres and a maximum density <br /> of one (1 ) unit per two (2 ) acres is allowed. A twelve <br /> percent ( 12%) impervious surface limitation has been <br /> proposed by the Orange County Planning Department for <br /> two-acre lots in lieu of the six percent ( 6%) limit <br /> recommended by CDM. In the case of the Orange County <br /> Planning Department proposal, the same sliding scale <br /> for lots larger than or smaller than two acres as <br /> proposed above would be applicable. Rather than <br /> providing for regional stormwater detention ponds as <br /> recommended by CDM, Option #2 would require the <br /> provision of on-site facilities to trap pollutants . <br /> g. <br /> A full description of the proposed changes is included <br /> in the attached information. <br /> RECOMMENDATION: The Planning Director recommends approval of the <br /> proposed amendments, including the following: <br /> 1 . Approval of Option #1 (five-acre zoning strategy) ; <br /> and <br /> 2 . Approval of the sliding scale of impervious surface <br />