Agenda - 03-05-1990 - Laserfiche WebLink

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R-7 22 additional relocatees will result. In addition, the proposed third eastbound lane between the I-85/US 421 and I-85/US 29 interchanges in Greensboro will not require additional right of way. Although the recom- mended revisions in the vicinity of the I-85/US 70 Connector interchange near Efland will require approximately ten acres of additional right of way, no relocations are anticipated for those revisions. B. Hydraulics As noted above, the proposed seventh and eighth lanes are to be constructed within the 46-foot median proposed in the FONSI . Therefore, constructing these additional lanes will not require further extension of drainage culverts and bridges beyond that required for the six-lane widening recommended in the FONSI. Existing culverts and bridges will be extended or replaced, as needed, to accommodate the proposed third eastbound lane near the west project terminal and the proposed diamond interchange at the I-85/US 70 Connector junction. C. Floodplain/Floodway Impacts As stated in the EA, no adverse impacts on floodplain areas are expected to result from the project. D. Special Permits Reouired It is anticipated proposed construction in the vicinity of all stream crossings along the project can be performed under the Department . of the Army Nationwide Permit in accordance with 33 CFR 330.5(a) (14) (for Minor Road Crossing Fills) and 33 CFR 330.5(a)(26) (for construction Above Headwaters) . An individual Section 404 Permit will not be required. E. Traffic Noise It is anticipated the widening of I-85 to eight rather than six lanes will result in an average increase in traffic noise levels of 0.4 dBA per receptor. This increase is relatively small due to the spreading out of traffic that will occur as result of the construction of addi- tional travel lanes. Studies are currently underway to determine at what locations noise abatement measures are warranted along the project. F. Air Ouality The predicted one-hour carbon monoxide concentration along the project for the year 2010 is 7.8 parts per million for urban/suburban ' areas and 8.8 parts per million for rural areas. These predictions are based upon one-hour background carbon monoxide concentrations of 2.4 parts per million in urban/suburban areas and 1.9 parts per million in rural areas. These predicted carbon monoxide concentrations do not exceed the one-hour National Ambient Air Quality Standard of 35 parts per million.