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County users due to the increased cost of hauling the products into the County. This may also <br /> result in increased truck traffic on county roads due to increased hauling distances from other <br /> sources. <br /> B. Alternative Land Use <br /> Residential <br /> Orange County's ULW overlay zoning district for the University Lake watershed would allow <br /> development of up to 17 single family residential units on the approximately 87 acres being <br /> considered for the quarry expansion. Assuming an impervious ratio of 4 to 6 percent for the <br /> allowable residential development, 17 units would result in approximately 3 1/2 to 5 acres of <br /> additional impervious surface in the study area, thereby exceeding the impervious surface limit <br /> as outlined by Orange County. <br /> Traffic generated by this land use would result in 201 vehicle trips per day on the adjacent <br /> roadway system due to the residential development. These vehicle trips would be in addition to <br /> traffic already on the roadway and quarry traffic (375 VPD) utilizing the roadway. When quarry <br /> activities cease the background volumes would decrease only slightly on SR 1104, since the <br /> majority of quarry traffic uses NC 54. <br /> The"Joint Planning Land Use Plan"adopted by Orange County and the Towns of Chapel Hill and <br /> Carrboro indicates that the soil suitability for use of septic tanks in the study area is moderate to <br /> severe. A designation of moderate indicates that soil properties or site features are unfavorable <br /> for the specified use (septic systems), but limitations can be overcome by special planning and <br /> design. The severe category denotes that soil properties or site features are so unfavorable or <br /> difficult to overcome that major soil reclamation, special design, or intensive maintenance is <br /> required. Because Carrboro, Chapel Hill, Orange County and OWASA have adopted policies <br /> against extending sewer lines into protected watersheds and since the project is in a protected <br /> watershed, the introduction of sewer lines is not an option. <br /> Agriculture <br /> According to the Soil Conservation Service Soil Survey, soils in the project expansion area consist <br /> of Georgeville Silt Loam (Ge), Herndon Silt Loam (Hr), and Tatum Silt Loam (Ta). All of these <br /> soils have potential for agricultural use. (See Figure 3.6) <br /> Georgeville and Herndon soils compose approximately 60% of the expansion area. Past uses <br /> 2-4 <br /> • <br />