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To:Chairman Schroeder and Orono Planning Commission Members <br />Ron Moorse, City Administrator <br />Michael P. Gaffron, Assistant Planning & Zoning Administrator <br />October 14, 1994 <br />#1965 James Lear/Gustafson Design. Inc., 2525 Dunwoody Avenue <br />Conditional Use Permit/Variance -Continuation of Public Hearing <br />List of Exhibits <br />i II <br />Gustafson Design - Letter 10/13/94 <br />City Engineer Review - 10/11/94 <br />Retaining Wall Design by AET, Inc. <br />Hardcover Calculations <br />Planning Commission Action Notice 9/22/94 <br />Planning Conunission Minutes 9/19/94 <br />DNR Letter 9/27/94 <br />Memo and Exhibits of 9/16/94 <br />Discussion <br />This item was tabled at your September 19 meeting pending receipt of a wail design <br />acceptable to the City Engineer and hardcover calculations. Applicant was advised to have his <br />engineer contact the City Engineer, which has been done. Applicant has submitted a design that <br />the City Engineer finds acceptable. <br />Proposed Design <br />Referring to Exhibit B, the design incorporates natural flat stone and layers of "geo-grid" <br />to provide stability to the disturbed soil areas. There will be drain tile behind each wall, and <br />the wall heights range from T to 8’. An integral part of the design is installation of riprap at <br />the shoreline. Where terraces between walls are generally flat, there would appear to be <br />opportunities for significant planting of shrubbery to help soften the visual impact. The <br />designer, Donovan K. Stormoe. P.E., indicates that an experienced soils engineer or technician <br />from AET should be on site during construction to observe conditions. <br />The City Engineer notes that the 2.5:1 slopes would be difficult to mow. In response, <br />applicant has indicated the slopes will not be mowed, and his letter notes the areas will be <br />protected with erosion mat and mulch. Applicants ’ letter also indicates the plantings intended <br />to be installed to help soften the visual impact of the wall system. Remember that this bank <br />protection project will likely require removal of a majority of the mature juniper type trees at <br />the shoreline.