Agenda - 04-02-1990 - Laserfiche WebLink

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26 t In addition to Joint Planning amendments, the County is considering amendments in County zoning and subdivision regulations for University Lake watershed. we understand that the County Planning Board may discuss University Lake watershed matters on March 28th. DISCUSSION Impervious surface limits In recent weeks, the work group has discussed the County staff ' s recommendation for a sliding scale of impervious surface limits including 6% for 5-acre lots and 12% for two-acre lots. The County staff developed this proposal after questions about flexibility for property owners were raised in a public hearing by the County in November. The hearing was on revisions to the County' s interim watershed standards for University Lake watershed. The County staff 's proposed imperviousness limits are less protective than those recommended by the work group last fall. OWASA staff has analyzed the County proposal and projected its effect on University Lake water quality. When combined with other proposed modifications to the Camp Dresser McKee recommendation, the proposed County impervious surface limits would contribute to a 36%, estimated degradation compared to present III water quality in the lake. The Chatham-Orange work Group's proposal in October included imperviousness limits of 4% for lots of 5 or more acres, 6% for 2 acre lots and 12% for existing lots less than 2 acres. On the basis of the Camp Dresser McKee model for projecting water quality from allowable development patterns, OWASA staff has estimated that the October, 1989 work group proposal would mean a 28% degradation from present water quality. Camp, Dresser McKee estimated its own recommendations would mean a 17% degradation in water quality. We believe that development of lots in subdivisions in the future should be subject to the impervious surface limits recommended by Camp Dresser and McKee, or alternatively, as proposed by the work group in October. We believe that future development can be designed with the impervious surface limits in mind, and that there is greater flexibility in designing future development than in the case of existing recorded lots. Amendments to the Joint Planning Agreement and Land Use Plan The County staff has proposed amending the Joint Planning Agreement to refer to University Lake watershed area rather than water quality critical area in the definition of Rural Buffer. The present Water Quality critical Area includes areas immediately around the Lake and tributary streams and creeks.