Unless otherwise specified, an easement or right-of-way, in form acceptable to the County, must be provided. The right-of-way must be at least 60 feet in width (30 feet each side of center line). Depending on the site conditions and use of the road, the County may, at its discretion, require more or less right-of-way than specified herein.

For safety purposes, all trees and brush shall be removed from the right-of-way.

All utility installations must be 36 inches below the lowest point of the road cross section, except high-pressure gas lines, which must be 48 inches below the lowest point of the road cross section. High-pressure gas lines shall be clearly marked with appropriate warning signs where the line intersects the right-of-way. All utility facilities parallel to a County road and associated manholes, junction boxes, meters or other above-grade apparatus shall be installed within five feet of the right-of-way line. Minor variations will be considered on an individual basis. In no event shall the installation be within such proximity to the traveled portion of the roadway as to interfere with off-road parking or road maintenance. Above-grade apparatus must be clearly marked with a delineated warning marker acceptable to the Public Works Department. All at-grade valve or junction boxes located in the road's driving surface or shoulder must be protected with an at-grade 2-foot by 2-foot by 6-inch concrete collar.

Irrigation systems and ditch crossings within the right-of-way must be bridged or piped and cased under the entire right-of-way. Piped road crossings shall be installed a minimum of 24 inches below the lowest point of the road cross section or with sufficient cover to withstand HS-20 truck traffic. Open ditches carrying irrigation waters shall be placed outside of the right-of-way. Borrow ditches shall not be used for irrigation or tail waters.

Positive site drainage away from the roadway will be provided utilizing historic or established drainage channels. Unless otherwise provided for and approved, maintenance of drainage easements outside the right-of-way that crosses private property will not be provided by the County. Each culvert crossing under the roadway shall be a minimum of 18 inches in diameter, or be sized to accommodate a standard 24-hour storm. The culvert shall be long enough to extend slightly past the toe of the foreslopes of the roadway, be in line with the established drainage ditch and installed in a manner that will not impound surface drainage water or silt in. The culvert must be of sufficient gauge or thickness and be installed with sufficient cover to withstand HS-20 truck traffic. Culverts with a 12-inch diameter shall be used for driveway access to each lot unless a different size is specifically required by the County Public Works Department.

The right-of-way radius and cul-de-sac design will be determined by site conditions and topography. However, the minimum right-of-way radius will be 50 feet and the minimum driving surface radius will be 43 feet. An adequate shoulder, foreslope, drain ditch and backslope shall be provided for within the design. A cross-section drawing of each cul-de-sac shall be included in the subdivision plans.

All vertical curves shall have such length as necessary to provide a safe distance and a smooth transition in the driving surface. For differences in slope greater than 2%, the minimum length of the vertical curve shall be 15 times the algebraic differences in slope expressed as a percentage.

The depth of the base coarse section of the roadway structure shall be determined by the roadway structural/pavement design. If allowed to be used as a driving surface, it shall be a minimum of 6 inches in depth. All such material shall meet or exceed Section 304, N.M.D.O.T. Standards ("Base Coarse and Subbase"), and testing must demonstrate that base coarse meets or exceeds AASHTO standards set forth below:

Mechanical Analysis-AASHTO T27; Passing No. 200 sieve-AASHTO T11; Liquid Limit-AASHTO T89; Los Angeles Abrasion-AASHTO T96; Soundness (5 cycle Magnesium Sulfate Solution)-AASHTO T104; Linear Shrinkage-Materials Testing Control Manual.

Base course aggregate materials shall be combined so that the resulting composite blend meets or exceeds the requirements of Class II, as follows:

Exhibit B, "County Road Standards," on the following page is an integral part of these specifications and standards and is incorporated herein as a substantive standard for road construction.