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purposes. Using demand assumptions of the previous alternatives, the total daily demand for water from these 984 lots /units would be 0.32 million gallons per day (mgd). If the 378 urban lots (proposed for service with Hillsborough water and sewer) are added, the total daily demand is 0.44 mgd. Some of the lots /units needing water service may use a community water supply - either community wells with a supply system, or some other form or shared water supply. However, a substantial number of the lots /units will likely require service from the Town of Hillsborough. The Town currently has approximately 1.5 mgd of water supply - with an additional 1.8 mgd projected to be available around the year 2000, producing a future safe yield of at least 3.3 mgd. The potential for water purchases with the City of Durham may increase this amount of available water. The Town's water treatment plant currently has a capacity of 3.0 mgd. The Town's current water demand is approximately 1.3 mgd. As a highest -case scenario, if there are no community systems and all 984 lots use Town water service, a projected demand of 0.44 mgd (including urban developments in the basin) would impact the Town's projected water system by requiring about 22 % of the Town's future available capacity. The potential for community water systems to serve some of these areas does exist. The hydrogeologic formations that tend to have the highest yield of ground water are found near Stoney Creek between New Hope Church Road and I -85. In this area, a community system may be more likely to develop adequate yield. However, not enough is known at this time about ground water resources to make a definitive statement on community well yield in this or other portions of the area SEWER SERVICE: It is anticipated that approximately 920 lots in the rural portions of the area (1,298 including the urban lots projected for Town water /sewer) will require some form of wastewater service other than on -site or off -site septic tank systems. A projected wastewater flow (effluent generation) of 0.38 mgd would result from this amount of development. Some of the 920 lots may be served by non - discharging community wastewater systems (such as low - pressure or spray - irrigation systems), developed and maintained under the auspices of the County Wastewater Monitoring and Maintenance Assurance program. However, many of the lots /units will likely require sewer service from the Town of Hillsborough. The Town's wastewater treatment plant has a capacity of 3.0 mgd, and is currently treating 1.05 mgd. As a highest -case scenario, if all 1,298 lots /units required Town sewer service, an additional 0.38 mgd would be treated by the Town (19% of current /future available capacity). GROUND WATER: As mentioned in WATER SERVICE above, best available information about the hydrogeology of the basin is that ground water yields will vary by location. Yields may range from average (relative to other categories) in some portions of the basin, potentially good in a small area near Stoney Creek, and less than average in areas to the north and west. Potential for community wells appear to exist, although exact location will be critical to ultimate ground water yield. Aside from the question of hydrogeology, further analysis on recharge rates for these aquifers is needed before definitive statements can be made. However, it appears probable that the denser open -space developments will not be able to rely solely (or perhaps not at all) on ground water for the water supply. At least 407 lots in this design would not need water service and would use individual wells. SEPTIC DISPOSAL: Soils with severe limitations for septic tanks occur throughout the site, as is the case in much of Orange County (see suitability maps for specific areas). In general, these areas of poorly - drained soils or soils with shallow depth to bedrock make for larger lot sizes in order to find adequate land for nitrification fields. On -site soil testing will be required to determine appropriate areas for on -site (septic) systems. Approximately 472 units in the design would be likely to use septic systems. TRANSPORTATION: Not evaluated at this tune. Transportation and air quality impacts will be evaluated in detail when the final plan is prepared.