Agenda - 05-22-1989 - Laserfiche WebLink

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• - _ Mr. Marvin E. Collins May 3, 1989 Page 3 Clustered development could also achieve the same goals without structural devices, provided that: • Clustered subdivisions are located in areas of the watershed where public sewer extensions are most feasible; or, if served by community wastewater systems, the facilities are publicly operated and maintained; • 85 percent of the total development site remains as permanent, natural open space; • 0.5 acre minimum lot sizes are set for clustered projects; • Maximum imperviousness is restricted to 4 percent of the total project area, including streets. The CDM report clearly recommends that any development more intensive than 5-acre single family residential (or the 5-acre, cluster equivalent, described above) be served by publicly maintained stormwater devices. The report also states: "In the event that Orange County elects to rely upon the structural BMP approach, it is recommended that a 6 percent imperviousness limit be established for areas zoned for 2-acre single family lots." The proposed McLennan's Farm project (37 acres/14 lots = 2.64 acres/lot) is almost twice the recommended 5-acre lot density. The proposed impervious cover of 11.9 percent is almost 3 times greater than the 4 percent recommended for projects with no structural stormwater controls, and twice the recommended limit for projects where publicly maintained structural devices are provided. No permanent stormwater control structures are included in the McLennan's Farm application. 1 OWASA Recommendation OWASA staff recommend that the Orange County Board of Commissioners deny the application for a Planned Development Special. Use Permit for McLennan's Farm on the basis that the proposed use will not promote the public health, safety and general welfare if located where proposed and developed and operated according to the plan as submitted. Specific findings to support this recommendation include: 1. The availability of substantially more technical information and policy consensus than existed when the application was last reviewed (Hazen and Sawyer, August, 1988; Camp Dresser & McKee, March, 1989; and Orange County Water & Sewer Policy, April 3, 1989);