Agenda - 11-01-1993 - VIII-A - Laserfiche WebLink

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13 2. The non-residential impervious surface limit proposed for WS-IV watersheds is less than the percentage allowed by the State mandate. The upper limit for impervious surface within WS-IV watersheds is proposed to be changed from 50% to 70% to correspond with the limits allowed by the State mandate. In preparing the draft Ordinance, it was the intention of staff to apply the limits as allowed by the State mandate. The 50% limitation, which is required only within WS-IV critical areas, was an oversight. 3. Proposed stream buffers may hinder development of existing lots. a) Requirements pertaining to septic tanks and nitrification fields The requirement for 300' septic setbacks and 150' building setbacks in Critical Areas is proposed to be deleted entirely, for the following reasons: DEM and Orange County Environmental Health require a 100' setback from streams for septic tanks and nitrification fields. Environmental Health has indicated that application of the 300' septic setback can result in the residence itself having to be setback almost an equal distance, even though the required setback is only 150'. This is the case when a grinder pump is used to pump effluent from the residence to the septic tank. If the residence has a basement, the grinder pump can be located there, and is considered a plumbing fixture. If the grinder pump is located outside of the structure, it is considered as part of the septic system, and setbacks apply. In order to function properly, the pump needs to be located relatively close to the residence. Because of these requirements, difficulty in building on lots adjacent to streams or in Critical areas is frequently encountered. These problems will be even greater for existing lots which were not subject to the setback standards at the time they were created, even when those lots conform to the minimum lot size requirements. The standards contained in the existing University Lake Watershed overlay district are based on the recommendations of a technical study by Camp, Dresser and McKee, and in most aspects are more restrictive than standards of the existing PW-II and WQCA overlay districts. The septic and building setback requirements were adopted in 1984 as part of the Water Quality Critical Area (WQCA) overlay district, and represents the only WQCA or PW-II standard which is significantly more restrictive than standards specific to University Lake. It had been the intent of staff to eliminate the PW-II and WQCA overlays in the University Lake watershed when the ULW standards were adopted. However when the ULW standards were adopted in 1989, the PW-II and WQCA overlays were not eliminated. 9