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STATE OF NORTH CAROLINA <br />DEPARTMENT OF TRANSPORTATION <br />P.O. BOX 25201 <br />RALEIGH 27611 -5201 <br />JAMES G. MARTIN DIVISION OF HIGHWAYS <br />GOVERNOR November 29, 1990 <br />THOMAS J. HARRELSON <br />SECRETARY <br />Mr. Paul K. Thames, P. E. <br />Orange County Engineer <br />109 Court Street <br />Hillsborough, North Carolina 27278 <br />Dear Mr. Thames: <br />7 <br />WILLIAM G. MARLEY, JR -, P -E. <br />STATE HIGHWAY ADMINISTRATOR <br />This is in response to your March 26, 1990 letter regarding the <br />proposed widening of I -85 from Greensboro to Hillsborough, Transportation <br />Improvement Program Projects I -303 and I -304. Enclosed in your letter was <br />a resolution passed by the Orange County Board of Commissioners March 5, <br />1990 requesting the following be included in the highway improvements: (1) <br />best management practices to control runoff from I -85 into Seven Mile Creek <br />and (2) provisions for continued access under I -85 at the existing SR 1144 <br />(Old NC 10) grade separation. <br />Roadway drainage pollutants originating from the proposed highway <br />facility will be filtered through vegetated areas such as grassed <br />shoulders, ditches, and slopes before entering Seven Mile Creek. An <br />emergency response plan established by Orange County and the North Carolina <br />Department of Crime Control and Public Safety, Division of Emergency <br />Management, will minimize potential contamination of Seven Mile Creek as a <br />result of hazardous material spills on I -85. During project construction <br />the contractor will be required to - follow erosion and sedimentation control <br />measures established by the Division of Highways and the North Carolina <br />Department of Environment, Health, and Natural Resources. Based upon these <br />factors, no major water degradation impacts on the future Seven Mile Creek <br />Reservoir are expected to result from the project. Permanent wet detention <br />ponds are not recommended for inclusion in the project. Our staff feel the <br />above features would remain appropriate if Seven Mile Creek were upgraded <br />to a WS -I classification by the North Carolina Department of Environment, <br />Health, and Natural Resources, Division of Environmental Management. <br />The existing grade separation on I -85 at SR 1144 is to be removed as <br />part of the project. There are no plans to construct a box culvert to <br />provide continued access at that location. NCDOT staff biologists have <br />indicated the primary wildlife corridor in the area is Seven Mile Creek, <br />which crosses under I -85 approximately 2600 feet east of the SR 1144 grade <br />