Agenda - 11-16-1993 - VIII-B (2)

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14 For University Lake watershed (see Attachment #9), CDM assumed a 100% delivery rato, since all portions of the watershed were within six hours travel time (by streamflow) from the reservoir. For the Little and Flat River watersheds (see Attachment#10), CDM identified delivery ratios as follows: Delivery Ratio Travel Time Management Zone 100% > 12 hours Most Critical 50-100% 30-12 hours Less than 50% <30 hours Least Critical The implication of delivery ratios is that higher densities could be permitted in the headwaters of the Little and Flat River watersheds. Nevertheless, CDM recommended a two- acre minimum lot size with a six percent (6%) impervious surface ratio throughout both watersheds. In contrast, CDM recommended a five-acre minimum lot six for University Lake watershed and a four percent (4%) impervious surface ratio. In the Little and Flat River watersheds, approximately one-third of the total land area (264 square miles) or 88 square miles falls within the "most critical" management zone or 12-hour travel time contour. When broken down into individual watersheds, about half of the Little River watershed or 48 square miles is within the 12-hour travel contour. For the Flat River watershed, about one-fifth of that watershed or 33 square miles is within a similar distance. In comparison, University Lake watershed contains 30 square miles, all or most of which is within the 12-hour travel contour. Because Cane Creek watershed is similar in size (29 square miles) to the other three watersheds, travel times for pollutant delivery are expected to be similar. RECOMMENDATION: The Planning Staff does not feel that travel time is the best means for justifying an interim five-acre minimum lot size for Cane Creek watershed. Both Little and Flat River watersheds were recommended for two-acre minimum lot size restrictions by CDM. In addition, CDM, in the University Lake Watershed Study, recommended a preliminary two-acre standard since Cane Creek reservoir was larger and deeper, and thus had a greater assimilative capacity, than University Lake. 4. Where are the proposed landfill sites in relation to the proposed watersheds and what implications do the proposed standards have for landfill location? The watershed regulations prohibit new landfills in WS-II and WS-III Critical Areas. Outside of Critical Areas, only non-discharging landfills are permitted. A non-discharging landfill is one which does not discharge leachate into a receiving stream. There are no restrictions in WS-IV watersheds. Landfill sites 2, 9, 11 and 17 remain under consideration and their general location is shown on Attachment #11. 0C2 is located on the north side of Hwy. 54, near Morrow Mill Road. It is not located in a protected watershed. 0C9 is located between NC 86 and NC 57, south of Phelps Road. A small area in the north portion of the site is in the Little River Watershed (WS-II). This classification allows for