Laserfiche WebLink
ULPiLI 1I UL'_111._4f1 k-41"I ' IY-)UL til <br /> E�111 ERICKSON <br /> == ENGINEERING <br /> Consulting E=ngineers <br /> July 5, 1996 <br /> 0-C< Q `� <br /> Mr. Kenneth B. Rolland <br /> 4119 Oak Street p <br /> Orono, MN 55356 <br /> RE: Timber Retaining Wall Design and Recommendations <br /> Dear Mr. Rolland: <br /> Enclosed please find our design for your proposed timber retaining wall. Contained in <br /> this letter are our recommendations concerning questions you and Brian Essig asked <br /> on the day of our visit. <br /> It appears ti ie main problem with the existing conditions is the poor quality of the soil <br /> behind the existing You stated that it was basic^;ly `,iy. f his soil is exerting too <br /> much pressure or. the wall, causing the wa!I and soil r:1ciE to shift and move the porch <br /> footings with it. It does not appear to be an overall slope failure since the iower tier wall <br /> appeared stable and the house foundation appeared statue and in good condition. Also, <br /> the design of the in-place wall is uncertain, as well as its condition. Therefore, the <br /> problem should be remedied by replacing the clay soi! with granular as shown on the <br /> enclosed sheet, and installing the new wal! as shown. <br /> Since tl,e porch footing has shifted (tilted) it is now unstable and may move or shift <br /> additionally in the future if !eft as is, since it will be improper iy loaded. The only way to <br /> be sure it remains stable in the future is to replace it, which we would recommend to <br /> avoid having �o make corrections at a later time. <br /> If you have any further questions or comments regarding the design or wall installation, <br /> please feel free to call. <br /> Sincerely, <br /> ERICKSON ENGINEERING <br /> A)" rte► <br /> Ron Benson, P.E. <br /> RBfjbl <br /> Erickson Engineering Company 3340 Republic Avenue St. Louis Park, Minnesota 55426 (612)929-6791 <br />