HomeMy WebLinkAboutResol 7385 Ex BCo
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July 12, 2023
Lisa Thostenson
2815 Casco Point Road
Orono, MN 55391
Submitted by email: purrtopia@hotmail.com
RE: Timber Retaining Wall Evaluation
Project Location: 2815 Casco Point Road, Orono, Minnesota
Project No. 23-7128
Dear Ms. Thostenson:
This letter is being sent per your request regarding the recently repaired timber retaining walls at the
above listed property.
This evaluation is based on the following:
x Repair progress photos provided by you or your representatives.
x Retaining wall design repair drawings prepared by Criterium-Schimnowski Engineers dated June
15, 2023 (attached).
x Site visit performed by Criterium-Schimnowski Engineers on June 12, 2023.
x Repairs were performed at Walls 1 (lowest tier), Wall 2 and Wall 3.
x No changes were required for Wall 4 (wall behind proposed shed/boathouse).
x Wall 5 was partially reconstructed by the contractor due to address some alignment issues.
x Wall 6 will be reconstructed due to the change in the proposed height of the wall. Refer to the
attached tiered wall cross-section drawing for more information.
Based on the information listed above, the repairs to the retaining walls appear to be structurally stable
and in general conformance with the repair details as prepared. Typical construction details such as use
of drainage elements and wall reinforcement appear to be followed correctly. As is normal for timber
retaining walls of this type, some seasonal and long-term wall movement and backfill soil settlement
should be expected. I recommend that concentrated areas of surface water be directed away from the
walls.
Scope of Service and Limitations
The purpose of this inspection and report is to evaluate the condition of the recently constructed or partially
constructed retaining wall. The report is not to be considered a guarantee of condition and no warranty is
implied. Our observations are non-destructive, and limited to those portions of the site/wall that could be
visually examined without excavation. Our scope of services did not include an exhaustive technical
investigation. No material sampling, analytic tests, precise measurements or engineering calculations were
performed. This includes but is not limited to: compaction testing, soil sampling, global stability calculations.
We did not determine whether the wall and its operation or use conform to any city codes, or regulations, or
restrictions that may be enforced within the jurisdiction. For construction phase services, it is understood that
the Contractor, not ENGINEER, is responsible for the construction of the project, and that ENGINEER is not
responsible for the acts or omissions of any contractor, subcontractor or material supplier; for safety
precautions, programs or enforcement; or for construction means, methods, techniques, sequences and
procedures employed by the Contractor. As Professional Engineers, it is our responsibility to evaluate
2815 Casco Point Road, Orono, Minnesota
July 12, 2023
Page | 2
available evidence relevant to the purpose of this inspection. We are not, however, responsible for
conditions that could not be seen or were not within the scope of our service at the time of the inspection. If
additional documentation or information is made available for review, I reserve the right to amend or add to
the opinions and observations presented in this report.
Opinions and recommendations in this report are limited to the scope of work. This report has been
prepared in strict confidence with you as our client. Reliance upon our report by other parties is strictly
prohibited. If you choose to share our report, you agree to indemnify, defend and hold harmless the
Engineer from any third-party action. No reproduction or re-use is permitted without express written
consent. Further, we will not release this report to anyone without your permission.
If additional documentation or information is made available for review, I reserve the right to amend or
add to the opinions and observations presented in this report.
Please call me if you have any questions or need more information. Thank you.
Sincerely,
Paul Schimnowski, PE
MN PE# 40126
I hereby certify that this plan, specification, or report was prepared
by me or under my direct supervision and that I am a duly Licensed
Professional Engineer under the laws of the State of Minnesota.
Paul Schimnowski, P.E.
Date: July 12, 2023 License #: 40126 (MN)
Project:
Client:
Boring No.
Soil Type:
LL: PI:
21.4
SET-R18a
Opt. Water Content (%):
Location:
As Received W.C. (%):25.7 PL:
Depth(ft):
100.2
*Assumed
Job No.
Date:5/8/23
14310
Specific Gravity:
9530 James Ave South Bloomin ton, MN 55431
Moisture Density Curve ASTM: D698, Method A
2815 Casco Point Road #23-0240
Maximum Dry Density (pcf):
Haugo Geotechnical Services
Lean Clay with sand (CL)
Sample:4/12/202
93
94
95
96
97
98
99
100
101
102
103
18 19 20 21 22 23 24 25 26 27 28
Dr
y
D
e
n
s
i
t
y
(
P
C
F
)
Water Content (%)
Proctor Points
Zero Air Voids
ASTM D3080
Pro ect/Client
Boring No.: Sample No. Depth:
Location: Sample Type:
Soil Type:
0.2
φ=φ=φ=φ=32.1 deg.φ=φ=φ=φ=31.2 deg.
Cohesion
0.032 TSF
Cohesion
TSF0.033Apparent
Peak Conditions
Friction Angle: Friction Angle:
At Given Shear Disp. Of:
Apparent
"These tests are for informational purposes only and must be reviewed by a
qualified professional engineer to verify that the test parameters shown are
appropriate for any particular design."
0.95Thickness (In.)
Water Content (%)
0.95
95.2
0.95
0.93
(in/min)
Diameter (In.)2.50 2.502.50
Date Reported:5/8/2023
Initial
Max Stress
Failure Criterion:
Plastic Limit:
A
0.0008
X
Bulk
(*) = Assumed Specific Gravity
Remarks: Specimens compacted to 95% of maximum standard proctor density at optimum moisture
content using -#4 material; Inundated after applying normal load. Consolidated and sheared to given
displacements at constant rate of 0.0008 inches/minute.
Plasticity Index:
Specific Gravity (*):
Liquid Limit:
Lean Clay with Sand (CL)
27.6 27.5 26.9
Shear Rate
21.4 21.4
95.2
B
2.68
0.94 0.94
0.38 0.75
97.3
0.97
1.50
Thickness (In.)
Water Content (%)
Normal Stress
Shear Stress
Dry Density (pcf)96.2 96.3
0.26 0.52
Direct Shear Test
Test Date:
Job No.:
2815 Casco Point Road #23-0240 / Haugo Geotechnical Services
4-12-23
Dry Density (pcf)
Before Shear
4/27/2023
14310
95.2
C D
21.4
-0.02
-0.015
-0.01
-0.005
0
0.005
0.01
0 0.05 0.1 0.15 0.2 0.25
Ch
a
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g
e
i
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T
h
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(
i
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0
0.2
0.4
0.6
0.8
1
1.2
0 0.05 0.1 0.15 0.2 0.25
Sh
e
a
r
S
t
r
e
s
s
(
T
S
F
)
Shear Displacement (inch)
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
Sh
e
a
r
S
t
r
e
s
s
(
T
S
F
)
Normal Stress (TSF)