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To: Mark E. Berr.hardson, City Administrator *« Prom: Michael P. Gaffron, Asst Planning & Zoning Administrator Date: September 14, 1990 Subject: #1532 Fullerton Properties - Bike Trail Ev^sement Request The Orono Park Commission has requested a 10' easement along County Road 6 for the purpose of constructing a bike trail. Because this request is occuring after preliminary plat approval, the opportunity for possijile changes to the plat which could minimize the impact of such a trail, is very limited. Had the request for a trail occured during the preliminary plat review process, it is likely that some of the drainfield sites would have been shifted to minimize the potential for conflicts between the bike trail and drainfield sites. There are 4 lots abutting County Road 6 through which a 10' wide bike trail easement is requested. Based on a review of the site plan for each lot in relation to topography, I would make the following comments: 1. In general, the City requires a 20' setback from drainfield sites to any hard surface areas, structures, etc. These setbacks are especially critical for mound drainfield systems which will be used exclusively in this plat. When the encroaching structure or hardsurface is uphill from the mound site, the concern is that such hardsurface areas will add surface runoff to the drainfield sites. When the hardcover or structure encroachments are downhill from the mound site, the concern is more extreme in that such structure, hardsurface, or the compaction of soils required to create such encroachment, will cause a "damming" effect in the upper few feet of soil through which the sewage is percolating both vertically and horizontally outwards from the mound system. Such a damming effect could cause surfacing of partially treated se-^tic effluent. 2. No design detail for a bike trail has been submitted by the applicant nor by the Park Commission. However, I would expect that a 5'or 6' wide paved surface over a gravel base would be the intended trail. It would seem likely that the equipment needed to bring in materials and create such ^ase work ajid pavtment will necessarily extend outside the 10' wide easement area. I would also expect that such equipment would tend to cause some compaction outside the boundaries of the finished pavement.