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Anderlik 6 Associates, Inc. <br />23M W. Trunk Highway 28 <br />S1. Gaul, AIN $5112 <br />612-636-4600 <br />August 6, 1987 <br />City of Orono <br />Box 66 <br />Crystal Bay, HN 55323 <br />Attn: Mr. John Cerhardson <br />Re: File No. 139-142 <br />Crystal Bey Road <br />Dear John, <br />Engineors i <br />IAw� w, Yw. f r. Ifw. A 4w4.. IY. <br />M. N <br />nL <br />nvwma awma at <br />secs' rim ri <br />rYrA. a\Y,� <br />MY. /YnMU <br />Ir1w YY <br />r�wM <br />We have reviewed the erosion problem on Ctystal Bay Road east of County Road <br />19. There are three basic options for restoring the Lake Shore along the <br />road. The first option would be to use a dragline to pull the material back <br />up on the slope. It is anticipated that additional fill material would be <br />necessary to complete the work. The second option would be to stabilize the <br />bank with retaining walls or a grid systems and then reconstruct the slope. <br />The third option would be to move the roadway south and flatten out the elope <br />to make it more stable. <br />The first option would return the bank to its original condition with a mini- <br />mum of effort and cost. The surface would be graded and four inches of top- <br />soil would be placed. The area would be seeded and an erosion control blanket <br />would be placed over the surface. This is not a fail safe system and there is <br />a good chance that a portion or all of the embankment could erode out again. <br />The second option would be a book reinforcement system which would hold the <br />bank in place. There are three different methods of accomplishing this with <br />the result being approximately the sax for all methods. The surface would be <br />covered with an erosion control blanket and seeded. This syet" would have <br />minimal risk of failing in the future. <br />The third option would be to .eloeste the roadway such that a 2:1 •lope can be <br />maintained up from the lake shore. This would require =via& the roadway <br />about 12 feet mouth and reconstructing the street and reseeding the bank. <br />The estimated cost for each option is listed telov: <br />Option 1 R^store bank <br />Option 2 Stabilize bank <br />Option 3 Relocate Street <br />page I <br />$ 95.00/lin.ft. <br />$140.00/lin.ft. <br />$140.00/lin.ft. <br />5620e <br />