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9/11/2013 <br />6 <br />Sustainability <br />Sustainable Trails support trail use with minimal impact to the natural system, have negligible loss & movement of surface material and require minimal maintenance. <br />Trail Sustainability Criteria Include: <br />Surface type <br />Grade <br />Aspect <br />Volume of use <br />Maintenance <br />Ecological impacts <br />Social Trails & Trail Erosion Concerns <br />Hillside Open Space Coyote Run <br />12