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r <br />! <br />i <br />Memo l/u Bonestroo <br />Jwiloscne <br />Anderttift <br />|\|| Affodairs <br />an^seii * ArtMttcit <br />ProidCtNum: 1489 Shoreline Drive Cffenf; City of Orono, MN <br />To: TomKeNogg FUoNo: 000139-05-001-0 <br />From; Philip J. Caswell. P.E.Dare; 6/23/05 <br />Ae; Permit Application Review <br />Proposed Shoreline Improvements <br />Rmnartu: I have reviewed the letter submitted by Mr. Jim Smith, of Concept Landscaping, in which he <br />responds to previous review comments re: the proposed shoreline improvements at 1489 Shoreline Drive using <br />"subterranean wails*. <br />According to Mr. Smith’s letter, he has used this method of slope stabilization many times before, reportedly <br />with good results, including within the City of Orono. In addition, the longevity of the walls is not an issue, since <br />their intent is only to provide temporary slope stabilization until the protective vegetative cover is established. <br />The walls are then no longer needed and can rot away, leaving the stabilized soil mass to remain. <br />Since the subterranean walls are considered to be temporary, they are part of the contractor’s "means and <br />methods* to produce the final stabilized slope repair. They are, therefore, allowed more leeway in their design <br />and construction, and I have no comments about them. <br />To reduce the potential for another wash-out or other damage during the initial (6-year) period, however, until <br />the fill soil is stable by itself, the surfoce of the existing natural soil should be "roughed up" so that the <br />compacted clay fill t»n be Integrated Into It. Whether if s considered "benching", "stepping", or even <br />"scratching", the surface must be disturbed enough that a slip plane is not created between the new fill and the <br />existing soils. <br />Finally, Mr. Smith evidently is very confident of this method of repair. While the design and preparation of <br />drawings by a licensed engineer is not required, the responsibilty for the proper perforn.ance of the stabilization <br />lies with Concept Landscaping. <br />B onmma, Koatn*, AndtrMk and AaaocMwa, tne.w¥m,tomMtroo,com <br />Q9iPmt9mm <br />HFi^MNaiO <br />pirnmmimm <br />0«iw <br />l9f»N <br />Fat <br />0 <br />117 <br />mrnrnfnmji <br />fm mtmim <br />mmmrnitm <br />wmrn.mmmi <br />mrnrnmiumv <br />ORCMOIfoa. <br />II GMLMNSm <br />Pimm <br />Fas mai-iw <br />flAlfolOl <br />QripdMa.l.mi <br />Pimm Ul imVH <br />FaaMIMMVt