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G. Willow Control <br /> <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 (Sa/i.¥sfl~des). Willows have a tremendous abilits' to multiply <br />by root and can grow }ust about an3qvhere there is adequate moisture. <br /> <br />Older trail secdons that do nor have adequate base construction, or are not <br />properly drained are most often the trails that are damaged by willow intrusion. <br />Over time, when cracks inevitably form in the surface of the bituminous trail, <br />xvater and light penetrate into the granular base. An}, 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 /> <br />Bio-barrierO is a product that has been used successfully in Ramsey to prevent <br />willoxv intrusion when installed beloxv the granular base in nexv 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 Ci~'s trails and are <br />being monitored for performance. <br /> <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 /> <br />The following tables are maintenance schedules that identify specific trail <br />segments to be resurfaced with pro}ected cost estimates. This schedule is <br />reflective of the current management technique used for trail O & M in Rams%: <br /> <br />42 <br /> <br /> <br />