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July 12, 2023 <br />Lisa Thostenson <br />2815 Casco Point Road <br />Orono, MN 55391 <br />Submitted by email: purrtopia@hotmail.com <br />RE: Timber Retaining Wall Evaluation <br />Project Location: 2815 Casco Point Road, Orono, Minnesota <br />Project No. 23-7128 <br />Dear Ms. Thostenson: <br />This letter is being sent per your request regarding the recently repaired timber retaining walls at the <br />above listed property. <br />This evaluation is based on the following: <br />x Repair progress photos provided by you or your representatives. <br />x Retaining wall design repair drawings prepared by Criterium-Schimnowski Engineers dated June <br />15, 2023 (attached). <br />x Site visit performed by Criterium-Schimnowski Engineers on June 12, 2023. <br />x Repairs were performed at Walls 1 (lowest tier), Wall 2 and Wall 3. <br />x No changes were required for Wall 4 (wall behind proposed shed/boathouse). <br />x Wall 5 was partially reconstructed by the contractor due to address some alignment issues. <br />x Wall 6 will be reconstructed due to the change in the proposed height of the wall. Refer to the <br />attached tiered wall cross-section drawing for more information. <br />Based on the information listed above, the repairs to the retaining walls appear to be structurally stable <br />and in general conformance with the repair details as prepared. Typical construction details such as use <br />of drainage elements and wall reinforcement appear to be followed correctly. As is normal for timber <br />retaining walls of this type, some seasonal and long-term wall movement and backfill soil settlement <br />should be expected. I recommend that concentrated areas of surface water be directed away from the <br />walls. <br />Scope of Service and Limitations <br />The purpose of this inspection and report is to evaluate the condition of the recently constructed or partially <br />constructed retaining wall. The report is not to be considered a guarantee of condition and no warranty is <br />implied. Our observations are non-destructive, and limited to those portions of the site/wall that could be <br />visually examined without excavation. Our scope of services did not include an exhaustive technical <br />investigation. No material sampling, analytic tests, precise measurements or engineering calculations were <br />performed. This includes but is not limited to: compaction testing, soil sampling, global stability calculations. <br />We did not determine whether the wall and its operation or use conform to any city codes, or regulations, or <br />restrictions that may be enforced within the jurisdiction. For construction phase services, it is understood that <br />the Contractor, not ENGINEER, is responsible for the construction of the project, and that ENGINEER is not <br />responsible for the acts or omissions of any contractor, subcontractor or material supplier; for safety <br />precautions, programs or enforcement; or for construction means, methods, techniques, sequences and <br />procedures employed by the Contractor. As Professional Engineers, it is our responsibility to evaluate