HomeMy WebLinkAboutREDTAIL RESIDENTIAL - PDP - 26-01 - SUBMITTAL DOCUMENTS - ROUND 2 - GEOTECHNICAL (SOILS) REPORTGeotechnical Engineering Supplemental Report_
Retail — Proposed Mixed Use Development
Fort Collins, Larimer County, Colorado
Project No. 20015260 .
Page 3
Terracon
We appreciate being of service to you in the geotechnical engineering phase of this project, and are
prepared to assist you during the final design stages and the construction phases as well. If you have any
questions concerning this letter or any of our testing, inspection, design and consulting services please feel
free to contact us.
Sincerely,
RED/S,
90.
TEERR�ACON
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David A. Rich
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Geotechnical E ��3r� nt Manager
Copies to:
Addressee (3)
North Star Design (2): Patricia Kroetch, P.E.
Ayres Associates (2): Mr. Paul Clopper, P.E.
Cedar Creek (2): Mr. Mike Phelan
Geotechnical Engineering Supplemental Report
Retail - Proposed Mixed Use Development
Fort Collins, Larimer County, Colorado
Project No. 20015260
Page 2
Terracon
Building
No
Referenced
Test Boring
No.
Estimated
Referenced
Test Boring
Elevation
Proposed Construction
Elevations
Estimated Depth
to Groundwater
at TB Location
Estimated
Groundwater
Elevation
3-foot
� Separation
Maintained as
Recommended
Top of
Foundation
Elevations
Assume 4-feet to
Bottom of
Foundation
Elevations
A
7
4988.0
4986.57
4982.6
11.3
4976.7
Yes
B
6
4988.3
4989.18
4989.2
9.7
4978.6
Yes
C
4
4996.1
4994.50
4990.5
Dry to 15'
4981.1
Yes
D
8 & 9
4987.6
4985.45
4981.5
10.3
4977.3
Yes
E
5
4994.9
4988.08
4984.1
Dry to 15'
4979.9
Yes
F
3
4996.5
4991.17
4987.2
14.2
4989.0
No
G
TB No. 2 -
20955185
---
4996.74
4992.7
---
+/- 4984
Yes
H
11
4992.8
4992.45
4988.5
10.3
4982.5
Yes
1
13
4992.5
4991.21
4987.2
10.8
4981.7
Yes
J
14
4987.4
4988.11
4984.1
Dry to 15'
4972.4
Yes
K
16
4980.7
4987.23
4983.2
7.3
4973.4
Yes
L
19
4978.6
4986.87
4982.9
5.2
4973.7
Yes
M
18
4981.3
4987.79
4983.8
7.6
4973.7
Yes
N
17
4984.2
4988.31
4984.3
9.2
4975.0
Yes
1 & 2
TB No. 1-
20955185
---
4996.20
4992.2
---
+/- 4984
Yes
3
11
4992.8
4995.53
4991.5
10.3
4982.5
Yes
4
10
4996.2
4993.22
4989.2
12.3
4983.9
Yes
5
12
4997.4
4992.90
4988.9
Dry to 15'
4982.4
Yes
6
12
4997.4
4992.18
4988.2
Dry to 15'
4982.4
Yes
7
12
4997.4
4991.24
4987.2
Dry to 15'
4982.4
Yes
8
12
4997.7
4990.53
4986.5
Dry to 15'
1 4982.4
Yes
9
12
4997.4
4989.60
4985.6
Dry to 15'
4982.4
Yes
10
15
4996.2
4988.88
4984.9
13.1
4974.0
Yes
11
15
4992.8
4987.19
4983.2
13.1
4974.0
Yes
As shown on the table above, the design engineers took into account the required 3-foot separation for the
bottom of footings to the groundwater levels for the project site. However based on the data presented in
the vicinity of Building F and/or Test Boring No. 3, the final elevations may need further adjustments. It is
our opinion the proposed Retail Development will not have a direct impact on the groundwater levels for
this site.
Irerracon
July2, 20Q3 Fort Collins, Colorado 80 21-0503
(970) 484-0359 Fax: (970) 484-0454
Lagunitas Company
3944 JFK Parkway— Suite B200
Fort Collins, Colorado 80525
Attn: Mr. Jon Prouty
Re: Geotechnical Engineering Report —Addendum No. 1
Retail - Proposed Mixed Use Development
Cameron Park 2"d Filing
Fort Collins, Larimer County, Colorado
Terracon Project No. 20015260
Terracon conducted a geotechnical engineering exploration for Retail Property, a proposed mixed -use
development project, located west of the Cameron/Fossil Creek Office Complex and College Avenue/US
Highway 287, south of Fairway Lane, and east of the Burlington Northern & Santa Fe Railroad tracks in
south Fort Collins, in December of 2001. The primary purpose of the initial study was to evaluate the site
for soil, bedrock and groundwater conditions; as well as to provide foundation, pavement, and earthwork
design recommendations _based on the subsurface conditions encountered. For further information and
findings thereof, please refer to our "Geotechnical Engineering Report" December 20, 2001, Project No.
20015260. Terracon also provided a supplemental report dated July 26, 2002, in which additional
information in regards to groundwater conditions relative to the adjacent ponds were addressed as well as
recommendations for earthen embankments for a waterline and a roadway through the central portion of
the site were provided.
The intent of this letter is to provide supplemental information and/or additional recommendations with
regards to the finished floor and foundation elevations for the proposed structures in relationship to the
estimated groundwater levels at the site to determine if groundwater conditions will be impacted by the
proposed development. As stated in our initial report dated December 20, 2001, we indicated the
proposed structures could be supported by conventional -type spread footings provided a minimum
separation of 3-feet between the bottom of the footings and the maximum anticipated rise in groundwater
exists.
The table presented herein provides the relationship between proposed footing elevations and estimated
groundwater elevations based on measurements obtained during the initial site assessment. Please refer
to the Groundwater Contour Map, Figure No. 2, presented at'the conclusion of this report for the
groundwater piezometric flow developed for the site. We initially presented this data based on an
assumed elevation of 100.00, which was referenced to a temporary benchmark (TBM) consisting of the
east bonnet bolt of the fire hydrant located along the northern property line of the site. On July 1, 2003 we
converted this assumed TBM elevation to a mean -sea -level elevation of approximately 4999.20, which is
reflected on the following table.
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