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6 noted that the impervious surface ratio will not be a burden because the sliding scale protects existing lots. It allows the developer the flexibility of shifting land from one lot to another. The Board decided that community disposal systems would be allowed. UPPER ENO, BACK CREEK, LOWER ENO, FLAT RIVER, SOUTH HYCO, HAW RIVER AND THE JORDAN LAKE WATERSHEDS The Board gave preliminary approval to the staff recommendation as listed on pages 16 through 27 of the December 6, 1993 agenda abstract. In summary, the major changes as recommended by the County Commissioners are listed below: The changes approved at this meeting are shown in bold face on the watershed charts of the December 21, 1993 abstract. 1. The staff had recommended that septic system setbacks of 300 feet apply adjacent to reservoirs only. The Board indicated a preference of 300 foot setbacks adjacent to the reservoir as well as streams within the University-CA overlay and a septic setback of 100 feet from streams in the University-PW overlay. 2. The staff had recommended that building setbacks of 150 feet apply adjacent to reservoirs only. The Board indicated a preference of 150 foot setbacks adjacent to the reservoir as well as streams within the University-CA overlay and a building setback of 150 feet from streams in the University-PW overlay. 3. In watersheds classified at WS-2 where residential density is not allowed to exceed one unit per acre, the Board proposed 50~ impervious surface for all fire stations and solid waste convenient centers. It was originally presented by staff to allow 50$ impervious surface limit to apply to one fire station and one solid waste convenient center. 4. The Board of County Commissioners indicated a preference for two acre minimum lot size for the Little River WS. The staff recommendation included a two acre lot size east of NC57 and a .92 acre lot size west of NC57. 5. The Board indicated a preference for the prohibition of septic easements and community disposal systems within all protected watersheds except for easements for repair where needed. The staff recommendation had been to apply the septic easement and community disposal system prohibitions only to the University Lake and Cane Creek watersheds and the Upper Eno critical area. 6. For watersheds designated at the work session, the Board of County Commissioners indicated a preference for 50$ impervious surface ratio for all fire stations and solid waste convenient centers, 12$ impervious surface ratio for all other non-residential uses, onsite infiltration the first inch of stormwater runoff and a limit of one percent of non-residential use throughout the watershed. The Planning Staff had recommended 70$ impervious surface ratio and 1$ for the Back Creek protected watershed, 163 acres with BMPs if the impervious surface ratio is greater than 12~.