7-1-5-4: PAVEMENT STRUCTURAL DESIGN CRITERIA:
   A.   Required lane widths and right of way requirements for all classes of streets are presented in table 7-A, "Summary Of Road Design Elements", of section 7-1-5-1 of this chapter. Subgrade soils investigation and evaluation will be necessary to determine the bearing values of the proposed subgrade soils. It is the designer's responsibility to determine that these details are applicable. A pavement design which varies from these standard details but conforms to the design procedures of the AASHTO "Interim Guide For Design Of Pavement Structures" published by the American Association of State Highway and Transportation Officials, Washington, D.C., may be submitted for review by the village public works director. The structural design guide for flexible pavements established by the New Mexico department of transportation may also be used. Variance from the standard details shall require written approval of the village public works director.
   B.   Acceptable design procedures require investigation and evaluation of subgrade soils and traffic data including an estimated percentage of heavy vehicles. A regional factor of 1.5, a serviceability index of 2.5, and structural coefficients equal to those used by the New Mexico department of transportation shall be used. Presentation of such data may be required to accompany the design submittal but shall be made available to the village upon request.
   C.   The structural design and construction specifications for the streets to be paved are to be established by a professional engineer licensed with the state of New Mexico.
   D.   When gravel roads are to be constructed:
      1.   The applicant shall submit specifications for the gravel surfacing and are to conform to the New Mexico department of transportation "Standard Specifications For Road And Bridge Construction", latest edition.
      2.   All such specifications shall be subject to approval by the village of Angel Fire.
      3.   Paved streets may be substituted for gravel roads at the discretion of the applicant, when the minimum requirement is for gravel roads.
      4.   On gravel roads the crown shall be three percent (3%).
      5.   Drainage structures shall be placed under the roadway at all intersections with arroyos or watercourses. Drainage structures shall be sized to pass the runoff from a 50-year, 24-hour frequency storm, and shall be approved by the village public works director. (Ord. 2007-06, 8-14-2007)