Agenda - 04-21-1992 - Laserfiche WebLink

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in County jurisdiction. With the substantial change in minimum rules from February 1992, what formerly were WS -III standards are now largely under the umbrella of WS -II standards. Since the County had requested split classifications, and the Town had not expressed an interest in the matter, DEM staff contacted our office in late -March to determine if a) the County /Town wished to amend their previous recommendation, and b) the County /Town were in agreement on such an amendment. Evaluation of WS-II-Potential My analysis of the minimum rules shows that if the Upper and Middle Eno watersheds were combined into a "Eno, Upstream of Hillsborough" definition, the area would now qualify as a WS -II watershed. The new rules require a 1/2 -mile critical area of 2 -acre lots around existing and potential water supplies, with one -acre lots in the remainder of the watershed. In addition, up to 5% of the watershed can be exempted for non -- residential purposes, with smaller lots and. 70% impervious coverage if stormwater control measures for a one -inch storm are instituted. In the "Upper Eno" (10 -1991 version), the 5% cap is not an issue, since the Cedar Grove node, portions of two small neighborhood nodes, and a small portion of the village of Efland are the only planned centers for non - residential development. Even if these areas were to build out (which could not occur under zoning guidelines) , the total area would be less than 3% of the watershed. But, in the "Middle Eno" (10- 1991), the Cheeks Commercial - Industrial node (built out) comprises 17% of the "Middle Eno ". However, if the two categories are combined as mentioned above, the non - residential areas comprise only 4.7% of the total watersheds - coming in under the 5% cap. (Note: The 5% cap can be expanded to 10% of the watershed with EMC approval). Other minimum rules for a WS -II watershed could be met within this combined watershed. The chairman of the Transportation Advisory Subcommittee has expressed an opinion that WS -II for Seven -Mile Creek will aid in getting spill control measures implemented by DOT during upcoming interstate widening. Such a classification would also be consistent with previous BOCC action on protection of Seven -Mile Creek, and provide the highest classification available under the state minimums for all potential water supplies. However, consideration must also be given to the potential impact of a future Eno Watershed Study, as well as limitations on expansion of non - residential nodes in the watershed areas. 5