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As a general rule, a quarry in a granite or hard rock formation such as the one at The American <br /> Stone Company will affect the water table out from the edge of the pit for a distance equal to the <br /> depth of the pit. Therefore, we would not expect any change of the water table beyond about <br /> 250' from the edge of the pit. There are no existing wells in that perimeter area. <br /> The closest groundwater uses to the existing quarry site are mobile home owners along SR 1104 <br /> at the northeast tip of the quarry. Groundwater for these mobile homes appear to be supplied <br /> from a community well along SR 1104 about 650 feet from the edge of the quarry. There has <br /> been no reported problems with this well either in quality or quantity of water over the more than <br /> 20 years the quarry has been in operation. <br /> Within Orange County, the quality of groundwater is considered to be good. There are, however, <br /> localized areas that experience high amounts of iron, chloride and/or hardness-causing <br /> constituents. In most cases, however, the groundwater is suitable for consumption with little or <br /> no treatment. <br /> 3.5.2 Floodplains <br /> The locations of the 100-year floodplains in the project area, as determined by the Federal <br /> Emergency Management Agency (FEMA), are shown on Figure 3.8, The areas shown are those <br /> that are likely to flood upon occurrence of a 100-year storm event. <br /> The 100-year floodplain along Phil's Creek in the project area has an average width of 150 feet. <br /> It is likely that the 100-year floodplain extends further toward the upper reaches of Phil's Creek <br /> north of SR 1104, but this area has not been studied by the Federal Emergency Management <br /> Agency. It can be assumed however, that the floodplain north of SR 1104 would be less than <br /> 150 feet wide. The wetland areas along Phil's Creek to the north and south of SR 1104 are such <br /> that they would provide excellent flood control areas. In addition, if Phil's Creek overflows north <br /> of SR 1104, the floodwater would flow into the quarry pit and reduce storm flooding further <br /> downstream. The existing quarry in essence will serve as a flood control system. <br /> 3.5.3 Hydrology and Drainage <br /> According to OWASA historical records (1890 to present), total annual precipitation in the project <br /> area averages 46.65 inches, Runoff flows into a network of waterways to the Cape Fear River and <br /> eventually into the Atlantic Ocean at Wilmington, NC. <br /> 3-17 <br />