2005-01-04 Test Pit Report
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SEH
MEMORANDUM
TO:
Bob Huering 9'\0.\ \ \
5020 Jason Avenue NE
Albertville, MN 55301
FROM:
Jim Schulz, PE
DATE:
January 4, 2005
RE:
Test Pit Report
SEHNo. A-ALBEV 0409 14
Enclosed is a copy of the requested soils test pit report and location map pertaining to Outlot C, Prairie
Run. The report indicates topsoil and soft clays unsuitable for building support.
It would not be practical economically to complete site correction for the entire site, therefore, the site
was constructed to plan grades with the understanding that when the future building location is
determined, site correction for the building area would be completed at that time. Future pavement areas
where more than 3 feet of fill was placed would not require site correction with an appropriate pavement
design.
jas/jmw
Enclosure
c: Pete Carlson, SEH (w/enclosure)
Bob Moberg, SEH (w/enclosure)
Larry Kruse, City Administrator (wi enclosure)
u:lalalbevI040900Icorrlm-huering-0 1 0305 .doc
Short Elliott Hendrickson Inc., 1200 25th Avenue South, P.O. Box 1717, St. Cloud, MN 56302-1717
SEH is an equal opportunity employer I www.sehinc.comI320.229.4300 I 800.572.0617 I 320.229.4301 fax
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A Test Pit Report
Proposed Development
Northwest of Kyler Avenue and Settlers Path
Prairie Run Addition
Albertville, Minnesota
Prepared for
Fehn Gravel and Excavating
Professional Certification
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.
~~
Associate - Senior Engineer
License Number: 21140
December 17,2004
Project AL-04-06183
f6)rn @ rn 0 W rn,~
Ull DEe 2 0 2004 J0,
1 SHORT;...tLtlOTlHfJ\lORICKSON
Braun Intertec Corporation :_______-.-.:)A~l\jT CLOUD. M~ , J
II
BRAUN
I NTE RTEC
Braun Intertec Corporation
11001 Hampshire Avenue S
Minneapolis, MN 55438
. December 17, 2004
Project AL-04-06183
Mr. Gary Pehn
Pehn Gravel and Excavating
Box 256
Albertville, MN 55301
Dear Mr. Pehn:
Phone: 952.995.2000
Fax: 952.995.2020
Web: braunintertec.com
Re: Test Pit Observations for the Proposed Development, Northwest of Kyler Avenue and Settlers
Path, Prairie Run Addition, Albertville, Minnesota
We have completed the test pit observations for the above proposed development. The purpose of the
test pits was to assist in evaluating subsurface soil and conditions with regard to site grading for the
proposed development.
Available Information
Test Pits 1 through 4 were taken at the approximate locations shown on the attached sketch and
completed using a backhoe supplied by Pehn Gravel and Excavating.
Soils Encountered
Four test pits were excavated atthe site on October 25, 2004. The test pits generally encountered
approximately 1 1/2 feet of clayey topsoil overlying clay glacial till to the termination depths ofthe test
pits. The clay glacial till soils consist mainly of sandy lean clay with layers of lean clay, clayey sand and
lenses of poorly graded sand. Some of the clay soils nearer the surface were judged to be soft, however,
the glacial till clays appeared to be medium to stiff at depth.
Site Grading
The topsoil and soft clays are judged unsuitable for fill and building support. Table 1 summarizes the
depths of topsoil and soft clay and provides recommended excavation depths at the test pit locations.
The recommended excavation depths are based on lightly loaded one-- to two-story buildings that may
have basements or be slab-on-grade structures. It should be noted that the test pits were performed prior
to any grading activities and that fill may have been placed to achieve final grades.
Test Pit
Number
TP-1
TP-2
TP-3
TP-4
Topsoil Thickness
. feet)
1 1/2
1 1/2
1 1/2
I 1/2
Soft Clay Thickness
feet
6
21/2
4 1/2
5
Recommended Excavation Depth
(feet
7 .1 /2 '
4
6
6 1/2
· Providing engineering and environmental solutions s'ince 1957
Fehn Gravel and Excavating
Project AL-04-06183
December 17,2004
Page 2
The excavation to remove poor soils should be extended laterally at least 1 foot for each foot offill
required below footings (1: I oversizing).
In pavement areas where more than 3 feet of structural fill was required to attain grade, the soil
correction work was limited to removing the surficial vegetation. The topsoil.and soft clays were left in
place and fill placed over these soils. If future buildings are located in this area, additional soil
correction work may be required under the future buildings.
The excavations should then be backfilled where needed with properly compacted fill. The fill needs to
be compacted to a minimum of95 percent of its Standard Proctor density. Where more than 10 feet of
fill is needed below foundations, the minimum compaction should be increased to 98 percent. More than
10 feet of fill may also need a construction delay monitored by settlement plates. This could be
evaluated on a case-by-case basis.
The remaining natural clays or compacted fill should be suitable for support of lightly loaded structures
using typical spread footing foundations sized to exert a maximum net allowable soil bearing pressure of
up to 2,000 pounds per square foot.
Additional Evaluation and Testing During Construction
Grading of some areas of the site can be difficult because of high moisture content clay soils. We
recommend a geotechnical engineer or his representative be on site during the site grading. At that time,
the suitability of the subsurface soils for support of fill and foundation loads can be further evaluated.
Excavation depths and provided oversizing can also be documented.
Compaction tests should be taken during the site grading operation, utility backfilling within the roadway
areas, utility backfilling near building pads areas and foundation wall backfill operations. In general,
compaction tests should be taken after about 2 feet of fill has been placed in the excavations and then at
about 2-foot vertical intervals thereafter. 7
In parking lot areas, we recommend a proofroll be performed before and after placement of the aggregate
base. The proofroll should be performed by observing the behavior of the subgrade soils when subjected
. to the wheel loads of a fully loaded, tandem-axle end dump. These proofrolls should be observed by a
geotechnical engineer.
General
In the absence of our written approval, we make no representation and assume no responsibility to other
parties regarding this report. The data, analyses and recommendations may not be appropriate for other
structures or purposes. We recommend that parties contemplating other structures or purposes contact
us.
Service performed by Braun Intertec Corporation personnel for this project have been conducted with
that level of care and skill ordinarily exercised by members of the profession currently practicing in this
area under similar budget and time restraints. No warrant, expressed or implied, is made.
Fehn Gravel and Excavating
Project AL-04-06183
December 17,2004
Page 3
It has been a pleasure performing these services for you. If you have any questions regarding the test pit
results or recommended excavation depths, please call Henry Vloo at (952) 995-2238.
Sincerely,
BRAUN INTERTEC CORPORATION
49~ lOr
, ~#' Haugo
Senior Engineering Assistant
~!!
Associate - Senior Engineer
Attachments:
Test Pit Location Sketch
Test Pit Logs (4)
c: Mr. James A. Schulz; SEH-St. Cloud
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-INTERTEC
Braun Project AL-04-06183
GEOTECHNICAL EV ALUATIQN
Prop9sed Development, Prairie Run Addition
Kyler Avenue and Settlers Path
Albertville, Minnesota
DRILLER:
Elev.
feet
954.5
Depth
feet ASTM
0.0 Symbol
CL
953.0 1.5
METHOD:
Description of Materials
(ASTM D2488 or D2487)
LEAN CLAY, with organics, black, wet.
(Topsoil)
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END OF TEST PIT.
Braun Intertec Corporation
LOG OF BORING
BORING: TP-l
LOCATION: See attached sketch.
DATE:
SCALE:
1":;= 2'
BPF WL
Tests or Notes
TP-I page Iofl
'BRAUNSM
I NTE RTEC
Braun Project AL-04-06183
GEOTECHNICAL EV ALVA nON
Proposed Development, Prairie Run Addition
Kyler Avenue and Settlers Path
Albertville, Minnesota
DRILLER: I METHOD:
Elev.
feet
952.0
Depth
feet ASTM
0.0 Symbol
CL
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Description of Materials
(ASTM D2488 or D2487)
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END OF lEST PIT.
Braun Intertec CorporatIOn
LOG OF BORING
BORING: TP-2
LOCATION: See attached sketch.
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TP-2 page I of I
. BRAUN$M
INTERTEC
Braun Project AL-04-06183
GEOTECHNICALEV ALUATION
Proposed Development, Prairie Run Addition
KylerAvenue and Settlers Path
Albertville, Minnesota
DRILLER:
Elev.
feet
952.5
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feet
0.0
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Description of Materials
(ASlM D2488 Or D2487)
LEAN CLAY, with organics, black, wet.
(Topsoil)
LEAN CLAY, brown, wet, soft.
LOG OF BORING
BORING: TP-3
LOCATION: See attached sketch.
DATE:
SCALE:
1" =2'
BPF WL
Tests or Notes
CL SANDY LEAN CLAY, brown, wet, medium to rather
stiff.
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END OF TEST PITS.
Braun Intertec Corporation
Ip.3 page 1 of I
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. BRAUN$M
I NTE RTEC
Braun Project AL-04-06183
GEOTECHNICAL EV ALVA nON
Proposed Development, Prairie Run Addition
Kyler Avenue and Settlers Path
Albertville, Minnesota
DRILLER: METHOD:
Elev.
feet
954.5
Depth
feet ASTM
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Description of Materials
(ASTM D2488 or D2487)
LEAN CLAY, with organics, black, wet.
(Topsoil)
LEAN CLAY, brown, wet, soft.
CL
SANDY LEAN CLAY, brown, wet, medium to rather
stiff.
- END OF TEST PIT.
Braun Intertec Corporation
LOG OF BORING
BORING: TP-4
LOCATION: See attached sketch.
DATE:
SCALE:
1" =2'
BPF WL
Tests or Notes
TP-4 page I of 1
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FUTURE SITE CORRECTION FOR BUILDING PAD
2004 PRAIRIE RUN
ALBERTVILLE, MINNESOTA