Attachment F_P1360 DWG_Part 2 of 12.pdf
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- N6247026R0011
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This document is a geotechnical subsurface exploration report and construction plan for a Joint Maritime Facility under Naval Facilities Engineering Systems Command - Atlantic. The report presents soil boring records, stratigraphic information, and soil classification data obtained from subsurface investigation performed by AECOM-Baker in March 2024 using mud rotary drilling methods at multiple boring locations (MB-1 through MB-5).
The document includes detailed definitions of soil terms, abbreviations for soil classification testing methods, and stratigraphic symbols used in boring logs. Critical construction requirements specify that contractors must perform undercut excavation to a minimum elevation of 0.73 meters beneath specified footings along column lines 1 and 2 (from column lines A through C) and column lines A and C (between column lines 1 and 2). The undercut extent must be extended D/2 width on either side of each footing, where D represents the undercut depth. Contractors may conduct test pits to confirm the presence of tidal marsh deposits identified in boring MB-3 and may propose cost credit variances if test results indicate the layer is absent. The contractor assumes full responsibility for dewatering undercut excavations, maintaining stable excavation sides with vertical shoring or safe slopes, and backfilling with approved material meeting compaction requirements per section 31 00 00 Earthwork. Water level conditions noted in the boring records reflect site conditions at the time of exploration and do not necessarily represent groundwater levels during construction, as seasonal fluctuations are anticipated.
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NOTES
JO
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1. THE SOIL BORING RECORDS REPRESENT THE GEOTECHNICAL
ENGINEER'S INTERPRETATION OF THE SUBSURFACE CONDITIONS
ENCOUNTERED AT THE SPECIFIC BORING AND TEST PIT LOCATIONS
AT THE TIME OF THE FIELD EXPLORATION BASED ON VISUAL
EXAMINATION OF THE FIELD SAMPLES OBTAINED AND LABORATORY
CLASSIFICATION TESTING ON SELECTED SAMPLES.
2. LINES DESIGNATING THE INTERFACE BETWEEN VATIOS STRATA ON
THE BORING RECORDS REPRESENT THE APPROXIMATE INTERFACE
LOCATION. THE ACTUAL TRANSITION BETWEEN STRATA MAY BE
MORE GRADUAL THAN INDICATED. THE BORING RECORDS MAY NOT
NECESSARILY BE REPRESENTATIVE OF THE MATERIAL CHARACTER
AND STRATA THICKNESS OVER THE ENTIRE CONSTRUCTION AREA.
3. WATER LEVELS SHOWN ON THE BORING RECORDS REPRESENT
THE CONDITIONS ENCOUNTERED AT THE TIME OF THE FIELD
EXPLORATION AND DO NOT NECESSARILY REPRESENT
GROUNDWATER LEVELS THAT WILL BE ENCOUNTERED DURING
CONSTRUCTION. IT IT POSSIBLE THAT GROUNDWATER LEVELS WILL
FLUCTUATE DUE TO SEASONAL VARIATIONS AND OTHER FACTORS.
4. TESTING LOCATIONS AND ELEVATIONS SHALL BE CONSIDERED
APPROXIMATE.
5. BORINGS WERE ADVANCED USING MUD ROTARY DRILLING
METHODS AS NOTED.
6. BORINGS PERFORMED BY AECOM-BAKER AND REPORTED IN
AECOM-BAKER'S SUBSURFACE INVESTIGATION DATA REPORT
DATED 29 MARCH 2024 ARE SHOWN.
7. REFER TO BORING LOG LEGEND ON THIS SHET FOR AN
EXPLANATION OF THE SYMBOLS USED ON BORING RECORDS.
N O
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C C
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D D
D
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LEGEND
0 m7.5 15
NORTH
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BORING LOCATION
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4 5 6
WF900
WF900
W F9
WF1400
W F1
W F9
W F9
W F9
W F1
W F9
W F9
WF900
WF1400
CF 3000 CF 3000
C1 C1
WF900
WF900
W F9
CF 3000 CF 3000
C1C1C1
CF 3000
SF
SF
SF
1.585 m
5.180 m
5.180 m
NOTES
m2.5 5
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1. PERFORM UNDERCUT EXCAVATION TO
MINIMUM ELEVATION 0.73 m BENEATH
FOOTINGS WITHIN THE AREAS IDENTIFIED
ON THIS PLAN. THIS INCLUDES FOOTINGS
ALONG COLUMN LINES 1 AND 2 FROM
COLUMN LINES A THROUGH C AND
FOOTINGS ALONG COLUMN LINES A AND
C BETWEEN COLUMN LINES 1 AND 2.
2. FOR UNDERCUT DEPTH "D" THE
UNDERCUT EXTENTS MUST BE EXTENDED
"D/2" WIDTH TO EITHER SIDE OF THE
FOOTING, SEE UNDERCUT DETAIL.
3. THE CONTRACTOR MAY CONDUCT TEST
PITS TO THE PLANNED UNDERCUT
ELEVATION TO CONFIRM THE PRESENCE
OF THE TIDAL MARSH DEPOSIT
IDENTIFIED IN MB-3. IN THE EVENT THAT
THE TEST PITS INDICATE THIS LAYER IS
NOT PRESENT WITHIN THE FOOTING
UNDERCUT EXCAVATION LIMITS, THEN
THE CONTRACTOR MAY PROPOSE A COST
CREDIT VARIANCE TO ELIMINATE THE
UNDERCUT FROM THE PROJECT.
4. CONTRACTOR IS RESPONSIBLE FOR
DEWATERING OF UNDERCUT
EXCAVATIONS AND MAINTAINING STABLE
UNDERCUT EXCAVATION SIDES USING
VERTICAL SHORING AND/OR SAFE
SLOPES AND SAFE WORKING
CONDITIONS.
5. SEE 31 00 00 EARTHWORK FOR BACKFILL
MATERIAL AND COMPACTION
REQUIREMENTS.
UNDERCUT DETAIL, NTS
DEPTH "D" BELOW BOF
AND EL 0.73 m, SEE
STRUCTURAL DRAWINGS
AND FOOTING
SCHEDULE FOR BOF
ELEVATIONS
D/2 D/2FOOTING
APPROVED
SUBGRADE,
EL 0.73 m
| B-001 NOTES AND LEGEND |
| B-101 SUBSURFACE EXPLORATION PLAN |
| B-201 FOOTING UDERCUT EXCAFATION PLAN |
| B-601 SUBSURFACE EXPLORATION RECORDS |
| B-602 SUBSURFACE EXPLORATION RECORDS |
| B-603 SUBSURFACE EXPLORATION RECORDS |
| B-604 SUBSURFACE EXPLORATION RECORDS |
| B-605 SUBSURFACE EXPLORATION RECORDS |
| B-606 SUBSURFACE EXPLORATION RECORDS |
| B-607 SUBSURFACE EXPLORATION RECORDS |
| C-001 LEGEND, NOTES & ABBREVIATIONS |
| C-002 CIVIL NOTES |
| VF 101 EXISTING CONDITIONS PLAN |
| 2026-01-28T16:51:16-0500 | |
| signature |
| 2026-01-28T16:51:16-0500 | |
| signature |
| 2026-01-28T16:51:16-0500 | |
| signature |
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