(A) Soil testing by a certified geotechnical engineer shall be performed for all streets to determine the soil classification and structural strength of the subgrade. The developer’s engineer shall provide a pavement design based upon the soil type and strength. California bearing ration (CBR) tests shall be performed on the subgrade material. At least two tests shall be performed for any development which proposes public roads. CBR tests shall not be spaced more than 500 feet apart as measured along the roadway.
(B) (1) Traffic counts shall be in accordance with the Institute of Transportation Engineers “Trip Generation” latest edition. The minimum design count shall be based upon ten trips per day per single-family home. Collector streets shall be designed using the sum of the traffic generated by contributing local streets. A minimum of 10% truck traffic for industrial and commercial roads shall be used in traffic counts.
(2) The pavement design thickness shall in no case be less than that specified in the NCDOT Subdivision Roads Minimum Construction Standards. The soils reports supporting the pavement design and the pavement design shall be submitted to the county for review and approval. Pavement design methods shall conform to NCDOT criteria.
(Ord. passed 4-17-1989; Ord. passed 3-1-2010)