HomeMy WebLinkAboutGEOTECHNICAL REPORT QuES T Consulting - Engineering - Testing
February 13, 2018
SCANNED)
BY
Rubin Custom Homes, LLC St Lucie Couhiv
4253 SW Meadows Highway
Palm City, FL- 34990
Attention: Mr. Steve Rubin
Re: Report of Geotechnical Study
Planned McCoy Residence
12774 Mariner Court
Palm City, FL 34990
QuEST Report No. J-18021.001
Dear Mr. Rubin:
As requested, Quest Engineering Services & Testing, Inc. (QuEST) has completed
a subsurface study at the subject site. The fieldwork involved the drilling of three Standard
Penetration Test (SPT) borings (ASTM D 1586) to depths of 10 feet and 15 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 located at Harbour Ridges in Palm City, Florida. We understand that
the residence on this site has been demolished and a new structure will be constructed instead.
We also understand the site will be raise approximately 5 feet from the existing grade by
importing new structural fill to the site. The new units 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 building area to support the planned
construction. The field work consisted of drilling four SPT borings to depths of 10 to 15 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 loose to medium dense
sand to the terminal limits of the exploration at 15 feet below grade.
Quest Engineering Services&Testing, Inc.Jupiter Ph(561)747 8886 Pompano Beach Ph(954)582 9800 Fax(954)582 9836
a
Rubin Custom Homes, LLC. -2-
QuEST Report No.J-18021.001
Groundwater
The ground water table was encountered at depths of 4 feet below ground surface. In the
absence of other data, we suggest assuming that a 12 to 18-inch rise in the water table could
occur during periods of prolonged rainfall and at the peak of the wet hydro-period which
typically occurs in the Fall.
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 '/ 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 building 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 building 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.
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.
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.
QuEST
Rubin Custom Homes, LLC. -3-
QuEST Report No.J-18021.001
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.
-000-
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.
Rez avi n, P.E.
Proj ct Engineer
Florida Registration No. 60223
Attachments: Boring Location Plan
Boring Logs
QuEST
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QuEST Title: BORING LOCATION PLAN
SPT Boring
Planned McCoy Residence
Project: Harbour Ridge
Quest Engineering Services & Testing, Inc. Palm City, Florida
2737 NW 19t" Street Scale
Pompano Beach, FL— 33069 Client: Rubin Custom Homes, LLC NTS
Project o. Drawn tineet o. Kevision No. Kevision Date
Ph (954) 582 9800 Fax (954) 582 9836 J-18021 RJ 1 of 1
` BORING LOG J
Project Name Planned McCoy Residence Project Number J-18021
Client Name Rubin Custome Homes, LLC Boring Number B-1
Boring Location See Boring Location Plan Date Drilled 02/9/18
Water Depth 4' -0" 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
Light ray o
1.0 15 1.0
1.5 1.5 1
2.0 2.0
2.5 2.5 2
3.0 14 3.0
3.5 3.5 3 •
4.0 4.0
4.5 4.5 4
5.0 15 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 Brown o DarkBrown Some Roots 8.5 8
9.0 14 9.0
9.5 Brown 9.5 s
10.0 10.0 10
10.5 n o Boring 10.5
11.0 11.0 11
11.5 11.5
12.0 12.0 12
12.5 12.5
1-3.0 13.0 13
13.5 13.5
14.0 14.0 14
14.5 14.5
15.0 15.0 15
15.5 15.5
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 19.0 19
19.5 19.5
20.0 20.0 20
Ground Elev. Not Known Completion Depth 15 Feet
Type of Boring Standard Penetration Test Boring Casing N/A
Hammer Wt. 140 lbs. Hammer Drop Ht. 30 Inches
QUEST
BORING LOG
Project Name Planned McCoy Residence Project Number J-18021
Client Name Rubin Custome Homes, LLC Boring Number B-2
Boring Location See Boring Location Plan Date Drilled 02/9/18
Water Depth 4' -0" 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
0.5 Light Gray SAND 0.5 0
1.0 13 1.0
1.5 1.5 1 •
2.0 2.0
2.5 2.5 2
3.0 15 3.0
3.5 3.5 3 •
4.0 4.0
4.5 4.5 4
5.0 12 5.0
5.5 5.5 5 •
6.0 6.0
6.5 brown Ao Dark Brown SAND some Roots 6.5 6
7.0 14 7.0
7.5 Brown SAND 7.5 7 •
8.0 8.0 8
8.5 8.5
9.0 15 9.0
9.5 9.5 9 •
10.0 10.0 10
10.5 10.5
11.0 11.0 11
11.5 11.5
12.0 12.0 12
12.5 12.5
13.0 13.0 13
13.5 13.5
14.0 14.0 14
14.5 15 14.5
15.0 15.0 15
15.5 15.5
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 19.0 19
19.5 19.5
20.0 20.0 20
Ground Elev. Not Known Completion Depth 15 Feet
Type of Boring Standard Penetration Test Boring Casing N/A
Hammer Wt. 140 lbs. Hammer Drop Ht. 30 Inches
QuEST
BORING LOG
Project Name Planned McCoy Residence Project Number J-18021
Client Name Rubin Custome Homes, LLC Boring Number B-3
Boring Location See Boring Location Plan Date Drilled 02/9/18
Water Depth 4' -0" 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
0.5
Light ray o
1.0 13 1.0
1.5 1.5
I' 2.0
2.0 2.5 2.5 2
3.0 14 3.0
3.5 3.5 3 °
4.0 :,a, 4.0
4.5 4.5 4
5.0 15 5.0
5.5 5.5 5 •
6.0 6.0
6.5 DarkBrown withSome Roots 6.5 6
7.0 9 7.0
7.5 Brown 7.5 7 •
8.0 8.0 $
8.5 8.5
9.0 15 9.0
9.5 9.5 9
10.0 10.0 10
10.5 10.5
11.0 11.0 �� ;
11.5 11.5
12.0 12.0 12
12.5 12.5
13.0 ;' 13.0 13
13.5 13.5
14.0 14.0 14
14.5 16 14.5 °
15.0 15.0 15
15.5 15.5
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 19.0 19
19.5 19.5
20.0 PZLO�
20
Ground Elev. Not Known Completion Depth 15 Feet
Type of Boring Standard Penetration Test Boring Casing N/A
Hammer Wt. 140 lbs. Hammer Drop Ht. 30 Inches
QuEST