Agenda - 10-14-1993 - D 1 - Laserfiche WebLink

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Floodplains (Sections 3.5.2 and 4.5.2) -A small area of existing flood plain associated with Phil's Creek may experience minor disruption during the introduction of culvert structures of the relocated roadway. Effects on floodplains will be minimal however due to the storage capacity of the quarry reservoir and the flood control benefits provided by the wetlands along Phil's Creek on both sides of existing SR 1104, Additional protection against flooding will be offered by the quarry pit itself. Any overflow from Phil's Creek would spill into the existing quarry pit. Water Quality(Sections 2.1, 3.5.1 and 4.5.1) -Expansion of the quarry, relocation of SR 1104,and relocation/modernization of the asphalt plant will result in virtually no net increase in impervious coverage beyond existing amounts. Drainage patterns and water quality characteristics of the runoff are expected to remain unchanged from current conditions. Stormwater runoff from the existing crushed stone production and storage areas will be managed by onsite sedimentation basins and a closed loop recycle system, with any excess flows released to Phil's Creek pursuant to conditions set forth in the NPDES General Permit issued by the North Carolina Environmental Management Commission. Runoff from areas adjacent.to the existing and expanded quarry pit will drain to the pit itself for recycle and/or release through this system. The expanded quarry operation is expected to have no adverse effects on water quality in Phil's Creek, OWASA's existing Stone Quarry Reservoir, or on the downstream University Lake water supply. A 401 Water Quality Certification has been issued for the quarry expansion by the North Carolina Environmental Management Commission. General runoff from the relocated asphalt plant will be continued in a sedimentation pond. Occasional excess flows will be released to a tributary of Phil's Creek after appropriate settling in this pond. Any fuel or other petroleum spills that may occur at the asphalt plant will be intercepted by a containment sump and oil/water separator. Clean water from the separator will drain to a separate pond equipped with an inverted siphon and oil absorbing materials to prevent any residual hydrocarbons from leaving the site. Any excess runoff from the spill containment pond will drain to the sedimentation pond described above. The relocated and modernized asphalt plant is expected to have no adverse effects on water quality to Phil's Creek, OWASA's existing Stone Quarry Reservoir, or on the downstream University Lake water supply, Air Quality (Sections 3.5.4 and 4.5.5) - Since the relocated roadway is in close proximity to the existing roadway, no increases of present traffic related air quality is expected. S-4