HomeMy WebLinkAboutCompaction Test 1 54
Headquarters IL t ENGINEERING Mailing
11345 U.S.Highway 1 Te C! P.O.Box 78-1377
Sebastian, FL.32958 Sebastian,FL.32978
Orlando Phone:772-589-071
723 Progress LVL AND TESTING Way C.A.#5693
Sanford,FL. 32771 KSMengineering.net
September 1, 2021
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GC.Coastal Homes LLC
David Gumpper (� 07
7655 Pelican Pointe Drive
Jensen Beach, FL 34957
Re: Lot 8, Pelican Point Drive
Parcel ID 3622-700-0012-000-8
Jensen Beach, Florida
KSM Project#: 21.5259-b
Dear Mr. Gumpper:
As requested, KSM Engineering &Testing has performed a subsurface investigation at the referenced
site. Presentation of the data gathered during the investigation, together with our geotechnical related
opinions, are included in this report. Please refer to KSM's report dated August 6, 2021 for findings
and recommendations regarding our initial site investigation.
At the time of drilling, the site was fairly flat with no surface vegetation.
Y 9
It is our understanding that the site had been excavated and backfilled prior to our arrival. The site
investigation program consisted of performing four (4) SPT borings, in the proposed construction
area, The SPT borings were terminated at depths of 10 to 14 feet below grade. The locations of the
borings are indicated on the attached location plan.
The SPT borings were completed in general accordance with procedures described in ASTM D-1586.
Also, the groundwater table was allowed to stabilize and the depth of the groundwater elevation
recorded from existing grade.
The records of the soils encountered, the penetration resistances and groundwater level are shown
on the attached logs.
Engineering Evaluation and Conclusions:
Based on the information obtained from this site investigation, we are pleased to offer the following
evaluation:
Subsurface Condition Summary - The boring logs and "N" values recorded during the SPT tests
indicate the subsurface soils consist of:
• Deposits of very loose to loose fine-grained sand with traces of clay from 0 to 7 feet below
grade, and
• Deposits of medium dense to very dense fine-grained sand from 7 to 14 below grade (boring
terminus)
Page 1 of 3
Lot 8,Pelican Point Drive 'P CA Ilk Is ENGINEERING
Jensen Beach,Florida A%Q j%% AND TESTING
KSM Project#:215259-b
No "Muck' or other problematic soils were encountered in the test borings. We believe, however, that
the potential settlement, both total and differential, caused by the very loose to loose soils will be
beyond the safe limits of the proposed structure. We believe that the proposed structure can be
supported on a shallow foundation provided our recommendations for site preparation are followed.
The following sections provide recommendations for the site preparation and foundation design.
Site Preparation:
The proposed building area and areas to be paved, plus a minimum margin of seven feet beyond the
proposed construction shall be stripped and grubbed of surface debris, including vegetation, roots and
organic matter(if encountered).
Begin excavating the prepared area in order to remove the very loose and loose soil deposits from
within the prepared area. Based on the boring logs, we estimate this will require the excavation to a
depth of approximately 5 feet below existing grade.
Excavated fine sand may be stockpiled and re-used in non-structural areas provided that it is not
mixed with organic or other unsuitable material. All over-excavation of the very loose to loose soil
deposits, replacement, and compaction should take place in the "dry". This is especially important on
this site due to the very loose soils encountered below the encountered water table elevation.
After the loose soil layer has been removed, the exposed surface should be graded level and proof
rolled. Sufficient passes should be made to produce a density exceeding 956/6 of the modified dry
density (ASTM D-1577) to a depth of 2 feet. After successfully proofrolling, backfill the undercut area
to desired grade with clean structural fill placed in loose lifts of 12 inch thickness and compact to
produce a density of 95% of the modified dry density (ASTM D-1577). We do not recommend the use
of heavy vibratory machinery on this site due to the proximity of neighboring structures.
Structural fill material placed below a depth of 3 feet below existing grade shall consist of clean
granular sand containing less than 5% material passing the U.S. Standard No. 200 mesh sieve.
Structural fill material placed above a depth of 3 feet below existing grade shall consist of clean
granular sand containing less than 10% material passing the U.S. Standard No. 200 mesh sieve.
Place structural fill in loose layers of 12 inches in thickness and compact each lift to at least 95
percent of its modified dry Proctor value.
We recommend contacting KSM to perform soil density tests at appropriate times during the site work
phase of this project.
Temporary dewatering will be necessary in order to achieve excavation and compaction
specifications. The actual method of dewatering should be determined by the contractor. We suggest
drawing down the water table to a depth of 2 feet below the bottom of excavations to avoid
compaction related problems.
Excavation:
Excavations should be sloped as necessary to prevent slope failure and to allow backfilling. As a
minimum, temporary excavations below 4-foot depth should be sloped in accordance with OSHA
regulations. Where lateral confinement will not permit slopes to be laid back, the excavation should
be shored in accordance with OSHA requirements. During excavation, excavated material should not
be stockpiled at the top of the slope within a horizontal distance equal to the excavation depth.
Provisions for maintaining workman safety within excavations is the sole responsibility of the
contractor.
Page 2 of 3
r .
Lot 8,Pelican Point Drive IV OIL A' ENGINEERING
Jensen Beach,Florida &I JiVA AND TESTING
KSM Project#:.215259-b
Closure:
Based upon our subsurface investigation at the above-mentioned project location, the reliance of the
recommendations presented within this signed and sealed report is predicated on KSM
representative's involvement to verify that the soils been prepared following the indicated
recommendations.
This report has been prepared in accordance with generally accepted soil engineering practices
based on the results of the test borings and the assumed loading conditions. No.warranties, either
expressed or implied, are intended or made. This report does not reflect any variations which may
occur between the borings. If variations appear evident during the course of construction, it would be
necessary to re-evaluate the recommendations of this project.
Environmental conditions, wetland delineation, water quality, karst activity, and municipal
requirements are not a part of this report.
We are pleased to be of assistance to you on this phase of your project. When we may be of further
service to you or should you have any questions, please feel free to contact the office.
Respectfully,
Cody C. Clawson, P.E.
Geotechnical Engineer
P.E. #91598
JEK/jt/CCC
E-mail to: gumpperl@gmail.com
Page 3 of 3
KSM Engineering&Testing BORING NUMBER B-1
P.O.Box 78-1377
11iJ1Vl Sebastian,FL 32978 PAGE 1 OF 1
KS
Tel:(772)-589-0712
Fax:(772)-589-6469
CLIENT GC Coastal Homes,LLC PROJECT NAME 7679 Pelican Pointe Drive,Lot 8
PROJECT NUMBER 215259-b PROJECT LOCATION Jensen Beach,Florida
DATE STARTED 8/20/21 COMPLETED 8120/21 GROUND ELEVATION HOLE SIZE inches
DRILLING CONTRACTOR GROUND WATER LEVELS:
DRILLING METHOD Split Spoon Sample Q AT TIME OF DRILLING 0.58 ft
I
LOGGED BY MM/CS/NV CHECKED BY CCC AT END OF DRILLING —
NOTES See Attached Location Plan AFTER DRILLING —
w o z ♦SPT N VALUE A
o-
U X } U)w a 20 40 60 80
w
~ a 0 MATERIAL DESCRIPTION -j m >a p Q W N z a PLT�L
w (L O� m O> Y" �" 20 40 60 80
0
(g <z W U z d Q El FINES CONTENT(%)❑
0 20 40 60 80
SZ Gray Sand with Traces of Clay
SS 2-1-1
(2) .............:..............:.......
1-2-3
• SS (5)
5 :..': :. :.......:...... .......:.......
9—SS
1-2-1
m :._ Brown Sand =
Gray Sand SS 5-8-12
N
(20)
10 SS (38)
U)
Bottom of borehole at 10.0 feet.
m
Z
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KSM Engineering&Testing BORING NUMBER B'-2
KSM Sebast°an FL 32978
78-1377 PAGE 1 OF 1
Tel:(772)-589-0712
Fax:(772)-589-6469
CLIENT GC Coastal Homes,LLC PROJECT NAME 7679 Pelican Pointe Drive,Lot 8
PROJECT NUMBER 215259-b PROJECT LOCATION Jensen Beach,Florida
DATE STARTED 8/20/21 COMPLETED 8/20/21 GROUND ELEVATION HOLE SIZE inches
DRILLING CONTRACTOR GROUND WATER LEVELS:
DRILLING METHOD Split Spoon Sample �Z AT TIME OF DRILLING 1.50 ft
LOGGED BY MM/CS/NV CHECKED BY CCC AT END OF DRILLING --
NOTES See Attached Location Plan AFTER DRILLING —
' w o t A SPT N VALUE A
U of >- 0 p j � 5 20 40 60 80
Ea.- O MATERIAL DESCRIPTION 0 p Q w N Z a PL��L
w of a� 0- m 0> Lu-4 20 40 60 80
0 0 Q z W 0 z 0 Ix ❑FINES CONTENT(%)❑
0 20 40 60 80
Gray Sand with Traces of Clay
7 SS
(2) :.......:......._......:.......
3-"
SS (8) ....... ..............:......
.
5
Gray Sand with Slight Traces of Shell SS 2 3 2
:... (5) ..i..
m ,0
r-. ... ... ... ...
• 5-7-8
SS
7-9-8 ..... .:.......:.....
..................
r :o:•'••
SS
10 (17)
Bottom of borehole at 10.0 feet.
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KSM Engineering&Testing BORING NUMBER B-3
KSMP.O.Box 78-1377
Sebastian,FL 32978 PAGE 1 OF 1
Tel:(772)-589-0712
Fax:(772)-589-6469
CLIENT GC Coastal Homes,LLC PROJECT NAME 7679 Pelican Pointe Drive,Lot 8
PROJECT NUMBER 215259-b PROJECT LOCATION Jensen Beach,Florida
DATE STARTED 8/20/21 COMPLETED 8/20/21 GROUND ELEVATION HOLE SIZE inches
DRILLING CONTRACTOR GROUND WATER LEVELS:
DRILLING METHOD Split Spoon Sample Q AT TIME OF DRILLING 2.75 ft
LOGGED BY MM/CS/NV CHECKED BY CCC AT END OF DRILLING —
NOTES See Attached Location Plan AFTER DRILLING —
A SPT N VALUE A
U o: >- U)w a 20 40 60 80
E- (L O MATERIAL DESCRIPTION ca >Cy QQ O=¢ w Z a P�M�—LL
o I g Z Ov- m o Z U v }'' 20 40 60 80
C7
< w d w El FINES CONTENT(%)❑
0 20 40 60 80
Gray Sand with Traces of Clay
2-3-3
SS
:
(6) :............... ..............
: Q
. .....................................
: : :•
SS 3-2-2
(4) ......:.......:.......
5
a SS 2-2-2
- (4)
N
Gray Sand SS 2-5-8
(13) :.......:...
8-15-18
r 10 SS :................:.......
(33)
;:.•:
8-13-19
SS
... :
(28)
N
Bottom of borehole at 14.0 feet.
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KSM Engineering&Testing
BORING NUMBER B-4
KSMP.O.Box 78-1377
Sebastian,FL 32978 PAGE 1 OF 1
Tel:(772)-589-0712
Fax:(772)-589-6469
CLIENT GC Coastal Homes,LLC PROJECT NAME 7679 Pelican Pointe Drive,Lot 8
PROJECT NUMBER 215259-b PROJECT LOCATION Jensen Beach,Florida
DATE STARTED 8/20/21 COMPLETED 8/20/21 GROUND ELEVATION HOLE SIZE inches
DRILLING CONTRACTOR GROUND WATER LEVELS:
DRILLING METHOD Split Spoon Sample V AT TIME OF DRILLING 2.50 ft
LOGGED BY MM/CS/NV CHECKED BY CCC AT END OF DRILLING —
NOTES See Attached Location Plan AFTER DRILLING —
w o A SPT N VALUE A
U of >_ U)W w 20 40 60 80
�-- =O m 0: �z� EL H� PL MC LL
a. a.O MATERIAL DESCRIPTION -j 2 >(7 a ¢ w w z
o - a-� O m O> w" 20 40 60 80
C7 <z � V? a Q ❑FINES CONTENT(%)❑
0 20 40 60 80
Gray Sand with Traces of Clay
2-1-1
SS (2) .............:..............
.......................................
SS 2-2-3
(5)
5
. .....................................
'a SS 2-2-2
(4)
N
Gray Sand 2-4-8N
SS
N
o ::':•:•' SS 8-10-15 .......:..............:.......
� 10 (25)
r
Bottom of borehole at 10.0 feet.
N
Z
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- LOCATION OF SOIL BORINGS
PROJECT: 7679 Pelican Pointe Drive, Lot 8, Pelican Pointe West,Jensen Beach,Florida
SHEET 10F 1 DRAWN BY: C.V.
PERMIT#: AS ENGINEERI G DESIGNED BY: C.C.C.
PROJECT#: 215259-b AND TESTING DATE: 20210824
SCALE: NONE