Agenda - 08-26-1991 - Laserfiche WebLink

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LOWER ENO WATERSHED A containment plan in the event of spill of failure, and appropriate safeguards against contamination are required. M. ISSUES A. The WS IV classification proposed by the State matches that requested by all involved jurisdictions (Orange County, Durham County, Durham City). B. The most significant issue to be resolved regarding the Lower Eno is the questions of whether the area is in fact, within the watershed protected area. The area shown on the preceding map reflects a 10 -mile arc from a City of Durham emergency water intake on the Eno River. Recently, questions have arisen as to whether this intake is to be protected as a long term water source. If it is not, the protected area for the Eno River WS -IV watershed will extend five miles from the pool elevation of Falls Lake. Under this reading, the protected area would not extend into Orange County. Until this question is resolved, the NCDEM maps which show this intake as a water source are used to qualify the 10 -mile protected arc. C. The watershed is not now classified as a protected watershed. The Land Use Plan and the Zoning Ordinance would have to be amended to define the watershed boundary. A new or revised zoning district and/or zoning overlay would have to be created to specify the new standards. The density standards would not require revision, as they are already more restrictive than required for a WS IV watershed. Although this watershed is not classified as a protected watershed, stormwater controls and stream buffers are required through the County Subdivision Regulations. D. There is currently no impervious surface limit. This could create some problems in development of existing lots which are smaller than 1 acre under the low- density option, particularly those which would require long driveways to access building sites. E. Stream buffers of 100' would be required. This could have an impact on existing lots that have limited buildable area, particularly those created prior to adoption of zoning regulation (1981) which do not meet current minimum lot size requirements. F. Opeaation and maintenance of detention ponds or other engineered stormwater controls used to exercise the high - density option will require oversight by the County. This will require development and implementation of a monitoring program by the Erosion Control Division and/or County Engineer. G. The amount of impervious surface for non - residential development in the watershed would increase from 50% to 70 %. However, the total amount of area that could be used for non - residential purposes would be limited to 10% of the watershed. There is currently no limit. 16