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Exhibit B Pg.2 of 2 <br /> a required minimum of 12 inches of separation. It is preferred that foreign utilities <br /> cross under Northern's pipeline where reasonable. Foreign utilities running <br /> parallel must be placed outside the easement a recommended minimum offset of <br /> 30 ft. from NNG's pipeline. <br /> • Appurtenances: All above grade appurtenances shall not interfere with ground <br /> patrols or leak surveys. All light poles, manholes, signs, trees, shrubs, etc. must be <br /> outside the easement a recommended offset distance of 30 feet from a Northern <br /> pipeline. <br /> • Fences: All fences (posts, gates, chain link, wood panels, etc.) shall not interfere <br /> with ground patrols or leak surveys. All fences running parallel to Northern <br /> facilities must offset a minimum distance of 25 ft. from a Northern pipeline. <br /> Fences may not cross Northern facilities within the easement. <br /> • Road Crossings: All road crossings must cross Northern's pipeline at or near a <br /> right angle and maintain a minimum of three feet of cover over the pipeline within <br /> the in the road way and road ditches. Roads running parallel to Northern's <br /> facilities must be outside the easement and offset a recommended offset distance <br /> of 25 ft. <br /> • Grade modifications: Earthwork and other grade modification must maintain a <br /> minimum of three feet of cover over NNG's pipeline after construction in all <br /> locations. Grading modifications shall not be designed to impound water above <br /> NNG's facilities. <br /> • Heavy Vehicle crossings: NNG engineering requests vehicle specifications for <br /> all construction equipment that will be anticipated to cross NNG facilities. NNG <br /> engineering shall recommend appropriate crossing protection methods per site if <br /> required. Potential crossing protection methods include: additional dirt cover, use <br /> of timber/steel plate matting, temporary bridge structures, or pipeline <br /> reinforcement as required. As a guideline, all crossings have the following wheel <br /> load restrictions without additional pipeline crossing protection: <br /> 0 24" Cover— 15,000 lbs. <br /> 0 36" Cover—30,000 lbs. <br /> 0 48" Cover—50,000 lbs. <br /> • Any damages or modifications to NNG's facilities shall be repaired or modified at <br /> the expense of the encroaching party. An estimate can be provided by NNG for <br /> any modifications or repairs as required. <br /> Northern Natural Gas Engineering will continue to review any revised construction <br /> plans and new proposals as they are developed. <br />