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135 <br /> time the water reaches Durham County and Lake <br /> Michie. <br /> The Planning Staff recommends no change to the <br /> existing minimum (net) lot size of 40 , 000 square <br /> feet (with the additional provision of a gross lot <br /> area (including road right-of-way) of at least one <br /> acre) for the Flat River Watershed. Impervious <br /> surface limitations are proposed to be as in the <br /> revised sliding scale. <br /> About 2/3 of the Little River Watershed is in Orange <br /> County and covers a significant portion of Little <br /> River and Cedar Grove Townships . Downstream <br /> development includes the residential portion of the <br /> Treyburn Development, which is located immediately <br /> adjacent to the reservoir. Existing standards in <br /> Durham County and Durham City require a two-acre <br /> minimum lot size and six percent impervious surface <br /> limit throughout the watershed. However, runoff <br /> from existing development bordering the reservoir <br /> could negate some of the upstream watershed <br /> protection measures. <br /> The Planning Staff maintains its recommendation of a <br /> two-acre minimum lot size, as proposed at the public <br /> hearing, but recommends that the impervious surface <br /> limit be as in the revised sliding scale. <br /> The upper limit for impervious surface within WS-IV <br /> watersheds is proposed to be changed from 50% to 70% <br /> to correspond with the limits allowed by the State <br /> mandate. In preparing the draft Ordinance, it was <br /> the intention of staff to apply the limits as <br /> allowed by the State mandate. The 50% limitation, <br /> which is required only within WS-IV critical areas, <br /> was an oversight. <br /> Willis continued with the requirements pertaining to <br /> septic tanks and nitrification fields. <br /> The requirement for 300 ' septic setbacks and 150 ' <br /> building setbacks in Critical Areas is proposed to <br /> be deleted entirely. DEM and Orange County <br /> Environmental Health require only a 100 ' setback <br /> from streams for septic tanks and nitrification <br /> fields. Environmental Health has indicated that <br /> application of the 300 ' septic setback often result <br /> in the residence itself having to be set back almost <br /> an equal distance, even though the required setback <br /> is only 150 feet. The mandated standard that septic <br /> tanks and nitrification fields be located at least <br /> 100 ' from perennial or intermittent streams is <br /> proposed to be moved from Article 6.23 .4 Setbacks <br />