HomeMy WebLinkAboutREPORT OF GEOTECHNICAL STUDYQUEST
Rubin Custom Homes, LLC
4253 SW Meadows Highway
Palm City, FL - 34990
Attention:
Dear Mr. Rubin:
SCANNED
BY
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,St �,U�o��fia9ons Ling
Mr. Steve Rubin
Engineering - Testing
April 27, 2018
Re: Report of Geotechnical Study
Planned Fraser Addition
1526 NW Buttonbush Circle
Port St. Lucie, Florida
QuEST Report No. J-18117.001
As requested, Quest Engineering Services & Testing, Inc. (QuEST) has completed
a subsurface study at the subject site. The fieldwork involved the drilling of two Standard
Penetration Test (SPT) borings (ASTM D 1586) to a depth of 20 feet below existing grade. The
approximate boring locations are indicated on the attached Boring Location Plan. The boring
logs, which are also attached, indicate the types of materials encountered and the results of'the
field tests and the measured. groundwater depths..
PROJECT CONSIDERATIONS'
The subject project site is at located at 1526 NW Buttonbush Circle in Port St. Lucie, Florida.
We understand that plans are to construct an addition to the existing residence. We don't have
information about the type of foundation system the existing residence is support on; however
we assume it is supported on a shallow .foundation system. The new addition will likely be of
CBS construction with a wood truss roof. While the loading information was not provided to us,
they are expected to be light. For purposes of this study we have assumed that maximum
column loads will not exceed 40 kips and wall loads 7 kips per linear foot (klf). This geotechnical
exploration was required to determine the, suitability of the foundation soils in the addition area
to support the planned construction. The field work consisted of drilling two SPT borings to
a depth of 20 feet below grade at the locations indicated on the attached Boring Location Plan.
STRATIGRAPHY
The stratification of the profile components as shown on the boring logs represents the
subsurface conditions at the actual boring 'locations. . Variations may occur within a short
distance from the borings. Lines of demarcation represent the approximate boundary between
the types of materials encountered, but the transition may be gradual, or not clearly defined.
The borings disclosed the soil 'profile at the drilled site area consists of medium dense sand to
the terminal limits of the exploration at 20 feet below grade.
Quest Engineering Services &Testing, Inc. Jupiter Ph (561)747 8886 Pompano Beach Ph (954)582 9800 Fax(954)582 9836
r
Rubin Custom Homes, LLC
QuEST Report No. J-18117.001
Groundwater
The ground water table was encountered at a depth
absence of other data, we suggest assuming that a
occur during periods of prolonged rainfall and at
typically occurs in the Fall.
-2-
of 6.5 feet below ground surface. In the
12 to 18-inch rise in the water table could
the peak of the wet hydro -period which
DESIGN RECOMMENDATIONS
Based on the results of our field tests, we believe that the site soils can safely support shallow
foundations designed for an allowable bearing pressure of 2,500 pounds per square foot (psf)
provided the earthwork recommendations given in this report are followed. To provide an
adequate factor of safety against a bearing capacity failure, the new footings should bottom
a minimum of 24 inches below the lowest adjacent grade. Continuous footings should have
a width of at least 24 inches and isolated footings 36 inches even if they result in bearing
pressures lower than allowable. Footings should also be reinforced adequately. Such footings
are estimated to sustain maximum total settlements of about 1 inch and differential settlements
of about '/Z inch, provided the loads are within assumed limits.
The slabs may be ground supported. A vapor barrier (preferably 10-mil thick) should be placed
over the addition pad fill, prior to placement of concrete for the floor slab. This will minimize the
entrance of subgrade moisture into the slab.
CONSTRUCTION RECOMMENDATIONS
Prior to beginning of construction activities, all. topsoil, vegetation, roots, uncontrolled fill and
other deleterious material should be removed, in their entirety, from the addition footprint area
plus a 5-foot wide perimeter area. Buried structures/utilities (if any) should also be removed in
their entirety. Care should be taken to ensure that compaction operations do not cause any
distress to nearby structures.
The stripped pad should be compacted to 95% of the ASTM D 1557 maximum dry density
degree. The building area may then be filled to the required slab subgrade elevation. The fill
soils should comprise of clean granular soils having no particle size larger than 3 inches. The
fill should also not have more than 10% fines (material passing the U.S. No. 200 Sieve). The fill
should be placed in 12-inch thick (loose measure) lifts. Each lift of fill should be compacted to
95% of the ASTM D-1557 maximum dry density.
Care should be taken to ensure that compaction operations do not cause any distress to nearby
structures (existing residence). Likewise, when addition area excavations, including footing
excavations, are made adjacent to the existing building, care should be exercised to ensure that
the existing structure's foundations are not undermined. This may require the use of sheet
piling along the existing building's perimeter areas that are adjacent to the new construction
area.
When footing trenches are excavated, the excavation bottoms should be examined. If any
organic, soft or fine-grained soils are encountered in the footing bottoms, they should be
removed in their entirety and replaced with compacted fill. The footing subgrade as well as the
slab subgrade soils should be compacted to 95% of the ASTM D-1557 maximum dry density.
QuEST
Rubin Custom Homes, LLC ' - 3 -
QuEST Report No. J-18117.001
LIMITATIONS OF STUDY
The soils engineer warrants that the findings, recommendations, specifications, or professional
advice contained herein, have been promulgated after being prepared in accordance with
generally accepted professional engineering practice in the field of foundation engineering, soil
mechanics and engineering geology. No other warranties are implied or expressed.
The recommendations prepared for the planned construction are based on information provided
and the available subsurface information. gathered. Any revision to the plans for the proposed
structure from that indicated in this report must be brought to the attention of the soils engineer
so that the may determine if changes to the foundation recommendations are required.
This report is also premised on the sub -surface soil conditions throughout the building pad
being similar to that encountered in the borings logs. If deviations from the noted subsurface
conditions are encountered during construction, they should also be brought to the attention of
the soils engineer so that he may evaluate them in light of the foundation design
recommendations, and make modifications if deemed necessary.
After the plans and specifications are more complete, it is recommended that the soils and
foundation engineer be provided the opportunity to review the final design and specifications, in
order that the earthwork and foundation recommendations may be properly interpreted and
implemented. At that time, it may be necessary to submit supplementary recommendations.
Monitoring and testing should also be performed to verify that suitable materials are used for
foundation and building construction.
QuEST appreciates the opportunity to be of service. If we may answer any additional questions
or be of further service, please call.
Sincerely,
Quest Engineering Services & Testing, Inc.
Lflo
'L 7-//Cj
dJa?an, P.E.
Project Engineer
Florida Registration No. 60223
Attachments: Boring Location Plan
Boring Logs
QuEST
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QUEST Title:
Project:
Quest Engineering Services & Testing, Inc.
2737 NW 19t" Street
Pompano Beach, FL — 33069 Client:
ro ec o.
Ph (954) 582 9800 Fax (954) 582 9836 J-18117
W.0-349
U011 62
BORING LOCATION PLAN
Planned Fraser Addition
1526 NW Buttonbush Circle
Port St. Lucie, Florida
Rubin Custom Homes, LLC.
RJ I 1 of 1
*SPT Boring
NTS
BORING LOG
Project Name
Planned Fraser Addition
Project Number
J-18117
Client Name
Rubin Custom Homes, LLC
Boring Number
B-1
Boring Location
See Boring Location Plan
Date Drilled
04/26/18
Water Depth
6' - 6"
Drilled By
FE&T
DEPTH
SYM-
DESCRIPTION OF MATERIAL
Blow
Depth
N Value
(FT)
BOL
Counts
(Ft)
0 10 20 30 40 50 60 70 80
0.
>,:Brown
to Dark Brown SAND
0.5
1.0
10
1.0
1.5
1.5
1
'
2.0
2.0
2.5
2.5
2
3.0
11
3.0
3.5
3.5
3
•
4.0
4.0
4.5
Light Brown SAND
4.5
4
5.0
14
5.0
5.5
5.5
5
•
6.0
6.0
6.5
6.5
6
7.0
14
7.0
7.5
7.5
7
•
8.0
8.0
8.5
8.5
$
9.0
16
9.0
9.5
9.5
s
Brown to Dark Brown SAND
10.0
10.0
10.5
10.5
10
11.0
11.0
11.5
11.5
11
12.0
s3,
12.0
12.5
12.5
12
13.0
13.0
13.5
13.5
13
14.0
14.0
14.5
18
14.5
14
15.0
15.0
15
15.5
15.5
16.0
16.0
16.5
16.5
16
17.0
17.0
17
17.5
17.5
18.0
18.0
18
18.5
18.5
19.0
20
19.0
19
19.5
19.5
20.0
20.0
20
End of Boring
Ground Elev. Not Known Completion Depth 20 Feet
Type of Boring Standard Penetration Test Boring Casing N/A
Hammer Wt. 140 lbs. Hammer Drop Ht. 30 Inches
QuEST
F�
BORING LOG
Project Name
Planned Fraser Addition
Project Number
J-18117
Client Name
Rubin Custom Homes, LLC
Boring Number
B-2
Boring Location
See Boring Location Plan
Date Drilled
04/26/18
Water Depth
6' - 6"
Drilled By
FE&T
DEPTH
SYM-
DESCRIPTION OF MATERIAL
Blow
Depth
N Value
(FT)
BOL
Counts
(Ft)
0 10 20 30 40 50 60 70 80
o
Brown to Dark Brown
1.0
,y
11
1.0
1.5
1.5
1
•
2.0
2.0
2.5
2.5
2
3.0
12
3.0
3.5
3.5
3
•
4.0
4.0
4.5
4.5
4
Light Brown
5-0
_ _
14
5.0
5.5
5.5
5
•
6.0
6.0
6.5
6.5
6
7.0
12
7.0
7.5
7.5
7
•
8.0
8.0
8.5
8.5
$
9.0
16
9.0
9.5
9.5
9
•
10.0
10.0
10.5
brown o DarkBrown
10.5
10
11.0
11.0
11.5
11.5
11
12.0
12.0
12.5
12.5
12
13.0
13.0
13.5
13.5
13
14.0
14.0
14.5
18
14.5
14
15.0
15.0
•
15.5
15.5
15
16.0
16.0
16
16.5
16.5
17.0
17.0
17
17.5
17.5
18.0
18.0
18
18.5
18.5
19.0
18
19.0
19
0-
19.5
19.5
20.0
20.0
20
o Boring
r
Ground Elev. Not Known Completion Depth 20 Feet
Type of Boring Standard Penetration Test Boring Casing N/A
Hammer Wt. 140 lbs. Hammer Drop Ht. 30 Inches
QuEST