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Operations and Maintenance <br /> Continued <br /> G. Willow Control <br /> Many of Ramsey's existing trails were built in areas that were less desirable for <br /> housing or commercial development. Soils are often damp and support large <br /> colonies of willows (Salix s�ecies).Willows have a tremendous ability to multiply <br /> by root and can grow just about anywhere there is adequate moisture. ' <br /> Older trail sections that do not have adequate base construction, or are not r <br /> . i <br /> drained are most often the trails that are damaged b willow intrusion. <br /> properly g Y <br /> Over time,when cracks inevitably form in the surface of the bituminous trail, <br /> water and light penetrate into the granular base.Any willow root matter in the <br /> sub-cut,below the base,can be triggered to grow up through the base,through <br /> the bituminous surface and into the open air. As the roots grow, they can <br /> heave and spawl the trail surface. <br /> Bio-barrier®is a product that has been used successfully in Ramsey to prevent <br /> willow intrusion when installed below the granular base in new trail construction <br /> and full tear-out repairs. Recently, test plots featuring varied installations of <br /> Bio-Barrier® have been constructed within some of the City's trails and are <br /> being monitored for performance. <br /> An approved cross section must be used for all future trail construction that is <br /> proposed to occur in areas where willows are abundant. It is likely that a Bio- <br /> Barrier® product, or an approved equal, will be used. <br /> The following tables are maintenance schedules that identify specific trail <br /> segments to be resurfaced with projected cost estimates. This schedule is <br /> reflective of the current management technique used for trail O&M in Ramsey. <br /> ISSUED FORREVIEWMAIr Master Trail Plan <br /> 12004 <br />