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

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The major stream in the project area transporting runoff is Phil's Creek. Phil's Creek flows through the quarry area in a southeasterly direction emptying into University Lake. University Lake is one of two water supply sources for Orange County residents. At the quarry site Phil's Creek is bordered by a 50 foot stream buffer area. Within protected watershed districts, areas of land along perennial streams are required to remain in their natural state unless the area is subject to serious erosion, in which case an erosion resistant vegetative cover shall be established and maintained. These areas are referred to as stream buffers. The ground cover in the stream buffer area slows the velocity of runoff and allows water to infiltrate into the soil where natural bacterial and chemical processes can change or trap pollutants before they reach the stream. These stream buffers are required by Orange County in an attempt to capture non- point source pollutants. Drainage in the quarry project area is towards Phil's Creek with the area adjacent to the quarry pit draining into the pit. Water collected in the pit is pumped to one of three holding/settling ponds. Water from these ponds is used in the plant crushing operations to control particle air pollution and is returned to the holding/settling basin where the solids settle and the water is recycled through the plant. As a precaution against fuel contaminants at the new asphalt plant, the entire area in which fuels and asphaltic materials will be stored, processed, and handled will be graded so that natural surface flows will be directed to a holding pond and any oil which might enter this pond will be removed. The clean water from this pond will pass through an inverted siphon to a sedimentation basin which will hold any soil which might be present in the runoff water. This basin will be protected from having oil enter it, therefore, no liner is needed. In accordance with requirements of the North Carolina Department of Environmental Health and Natural Resources, erosion control structures have been placed at appropriate locations outside the buffer along Phil's Creek. Runoff is directed to these sediment basins and is filtered prior to entering the buffer area and on into the creek. The erosion control structures are highlighted in Figure 3.7. The Erosion and Sedimentation Control Plan for the quarry, which is included in the mining permit approved by the Division of Land Resources, is also considered a requirement of the NPDES General Permit. Guidelines in the NPDES General Permit require that all erosion and sedimentation control facilities be inspected every 7 calendar days and within 24 hours after any storm event that results in a discharge of stormwater runoff from the site. The stormwater runoff discharges shall be inspected by visual observations and the permittee shall keep a record of all 3-18