Introducing Oracle iSetup Kirk Williams Frontier Consulting, Inc. Senior Oracle Consultant.
Frontier Geosciences Inc.
Transcript of Frontier Geosciences Inc.
Frontier Geosciences Inc.
MARINE SEISMIC REFRACTION, BATHYMETRY
AND SUB-BOTTOM ACOUSTIC PROFILING
SURVEY REPORT
RVYC COAL HARBOUR MARINA RECONFIGURATION
VANCOUVER, BC
Submitted to:
Royal Vancouver Yacht ClubMarch 2, 2018
Authors:Caitlin Gugins, P.Geo.Cliff Candy, P.Geo.
Project: FGI-1534
237 St. Georges Ave. North Vancouver, B.C. V7L 4T4
604 987 3037
Frontier Geosciences Inc.
Table of Contents
1. Introduction 1
2. The Sub-bottom Acoustic Profling Survey 2
2.1 Bathymetry Survey 2
2.1.1 Survey Equipment 2
2.1.2 Survey Procedure 2
2.2 Sub-Bottom Acoustic Profling System 4
2.2.1 Survey Equipment 4
2.2.2 Survey Procedure 4
2.2.3 Data Processing and Interpretation Procedure 4
3. The Seismic Refraction Survey 6
3.1 Survey Equipment 6
3.2 Survey Procedure 7
3.3 Data Reduction and Processing 7
4. Geophysical Results 8
4.1 General 8
4.2 Discussion 8
5. Limitations 10
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Illustrations
Location
Figure 1 Survey Location Plan Appendix
Figure 2 Site Plan Appendix
Figure 3 Bathymetric Elevation Contour Plan Appendix
Figure 4 Interpreted Bedrock Elevation Contour Plan Appendix
Figure 5 Interpreted Sediment Thickness Contour Plan Appendix
Figure 6 Interpreted Depth Section SL18-01 Appendix
Figure 7 Interpreted Depth Section SL18-02 Appendix
Figure 8 Interpreted Depth Section SL18-03 Appendix
Figure 9 Interpreted Depth Section SL18-04 Appendix
Figure 10 Interpreted Depth Section SL18-05 Appendix
Figure 11 Interpreted Depth Section SL18-06 Appendix
Figure 12 Interpreted Depth Section SL18-07 Appendix
Figure 13 Sub-Bottom Acoustic Profling Example Line 12 Appendix
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1. Introduction
During the periods of January 16 to January 18 and February 7, 2018, Frontier Geosciences Inc. carried out
a marine seismic refraction and sub-bottom acoustic profling investigation for Royal Vancouver Yacht Club
at the Coal Harbour Marina in Vancouver, BC. A Survey Location Plan of the area is shown at a scale of
1:50,000 in Figure 1 of the Appendix.
The purpose of the survey was to determine ocean bottom contours, thicknesses of overburden materials
and the depths to and confguration of the bedrock surface. This information will be used to aid in the Coal
Harbour Marina reconfguration. The survey area encompassed the western half of the marina and
surrounding areas. The surveyed area covers approximately 300 metres by 300 metres, with a total of
approximately 1020 metres of marine seismic refraction surveying completed on seven separate lines. A
Site Plan illustrating the locations of the seismic refraction transects and the boat track is presented at a
1:2,500 scale in the Appendix.
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2. The Sub-bottom Acoustic Profiing Survey
2.1 Bathymetry Survey
2.1.1 Survey Equipment
The overwater bathymetry survey was completed using an Imagenex DeltaT multibeam sonar. This sonar
sounder operates at 675 kHz, and provides a resolution of 0.2% of range. The sonar employs an ethernet
connection to transmit the data at high speed to the acquisition system for real-time display and logging.
The motion and orientation of the sonar system was monitored with a Honeywell HMR gyro-compass. The
resolution of the Honeywell heading measurement is 0.1 degrees and the roll and pitch measurement is
0.04 degrees. Power for the feld computers and sonar was provided by ship’s power. Royal Vancouver
Yacht Club's aluminium boat the Northwest was used for the survey.
The position of the sonar system was monitored with a Hemisphere S320 GNSS/GLONASS RTK Global
Positioning System (GPS) receiver. The Hemisphere S320 is a 24-channel, dual frequency receiver with L1
and L2 carrier phase measurements. The system includes a GPS antenna, receiver, internal radio and a
battery in a unit that is utilized as a RTK rover. The RTK position corrections can be received either by the
internal radio, or by the built-in GSM module for mobile phone communication. Communication between
the receiver and handheld controller is provided through Bluetooth wireless technology.
2.1.2 Survey Procedure
The multibeam sonar was placed in the water at a depth of 0.27 metres on the port side of the vessel. Data
collected from the Imagenex DeltaT was logged in real-time, together with position information, and the
HMR gyro-compass. All data was stored in time synced notebook computers. The horizontal datum is UTM,
zone 10 North. The survey was carried out in good conditions, and the continuity and quality of the data
was excellent. Tidal corrections were taken form the observed tidal measurements provided by the
Canadian Hydrographic Service (CHS) for Vancouver.
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The sonar position and orientation measurements, and sonar depth measurements were combined and
analyzed using the MB-System multibeam data processing software, written by the Monterey Bay
Aquarium Research Institute and the Lamont-Doherty Earth Observatory. The resulting sonar fles were
processed to produce a map that merges each individual swath to produce a fnal detailed map. Gridding
and contouring of the data was achieved with the Golden Software program Surfer. A value of 1470 m/s
was used to convert the sonar range information into depth.
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Example of Sub-bottom Acoustic Profliin Setup
Frontier Geosciences Inc.
2.2 Sub-Bottom Acoustic Profiing System
2.2.1 Survey Equipment
The sub-bottom acoustic profling (seismic refection) survey was completed with an electric pulser source
(precision double coil, vertical boomer) and hydrophone receiver system. The source is an electromagnetic
transducer system that generates a broad-band, acoustic signal source operating at a dominant frequency
of 250 Hz. The receiver system is a pressure sensitive, multi-element hydrophone receiver array contained
in an oil-flled eel. The spacing of the receiver elements is designed to maximise the signal of the wavefront
arriving vertically from the sub-bottom refection, and minimise noise due to movement through the water
and the direct wave arriving horizontally from the pulser source. The refected signals are amplifed and
digitised with a 24-bit data acquisition system, and recorded on a survey system computer. Power for the
seismic system was provided by ship’s power.
2.2.2 Survey Procedure
The pulser source was towed at a distance of 10 metres behind the vessel, and the midpoint of the receiver
system was 16 metres behind the source. In operation, pulses from the source were refected from the
bottom and sub-bottom horizons, summed in the elements of the hydrophone array, and transferred to
the recording amplifers. The computer recorded a seismogram of 200 milliseconds two-way time duration
approximately twice per second.
2.2.3 Data Processing and Interpretation Procedure
The sub-bottom acoustic profling data was processed into SEG-2 format and imported into the Seismic
Unix refection processing package. The positioning information was processed to account for the lay-back
of the source and receiver from the GPS receiver. After processing steps that include trace balancing,
bandpass fltering and Stolt migration, the data was converted to SEG-Y format, correlated to the GPS
position information, and imported into the Seismic Micro Technologies (SMT) 2D/3D seismic
interpretation package. This software is a comprehensive 2D/3D seismic interpretation program that
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provides interpretive and horizon picking tools integrated into a map and section database, data
management and display system. In addition, the bathymetry data were imported as a horizon into the
SMT package for interpretation and to allow full handling of the time to depth conversion.
The frst stage in the analysis was the use of the horizon picking tools to identify the bedrock refector and
refectors present within the sediment column. The software shows time markers at the intersection of
lines and tie-lines, facilitating the picking of a consistent event throughout the map area. The data was then
converted to depth, and the surfaces were plotted in the colour contour format.
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3. The Seismic Refraction Survey
3.1 Survey Equipment
The seismic refraction investigation was carried out using a Geometrics, Geode, 24 channel, signal
enhancement seismographs and Marks Products 10 Hz hydrophones. hydrophone intervals along the
multicored seismic cable were maintained at 5 metres in order to ensure high resolution data on
subsurface layering. Seismic energy was provided by a small Bolt airgun, which released 10 cubic inches of
compressed air into the water. Shot initiation or zero time was established by a Gisco seismic radio trigger.
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Mariie Seismic Refractioi Iistrumeit Setup
Frontier Geosciences Inc.
3.2 Survey Procedure
For each spread, the seismic cable was stretched out in a straight line along the wharf and the
hydrophones sunk to the ocean bottom. Multiple separate 'shots' were then initiated: one at either end of
the hydrophone array, two at intermediate locations along the seismic cable, and one off each end of the
line, to ensure adequate coverage of the subsurface. The shots were triggered individually and arrival
times for each hydrophone were recorded digitally in the seismograph. For quality assurance, feld
inspection of raw data after each shot was carried out, with additional shots recorded if frst arrivals were
unclear. Data recorded during feld surveying operations was generally of good to excellent quality.
Throughout the survey, notes were recorded regarding seismic line positions in relation to features along
the marina structure. The elevation of the hydrophones was determined from the bathymetric survey, and
lead line depth measurements taken at each hydrophone location. All the depths were then corrected to
tide and chart datum.
3.3 Data Reduction and Processing
The fnal interpretation of the seismic data was arrived at using the method of differences technique. This
method utilises the time taken to travel to a hydrophone from shotpoints located to either side of the
hydrophone. Velocities are calculated as the slope of frst break pick times and hydrophone distances.
When there is a signifcant change in slope a new velocity is calculated and assigned to the new layer. Basal
velocities are calculated by the arrivals of off end shots where picked arrivals are refracted from the basal
layer. Each hydrophone is assigned a velocity and time for each layer. Using the total time, a small vertical
time is computed which represents the time taken to travel from the refractor up to the ground surface.
This time is then multiplied by the velocity of each overburden layer to obtain the thickness of each layer at
that point. The thicknesses are splined along the seismic line to create a continuous boundary between
layers.
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4. Geophysicai Resuits
4.1 Generai
The results of the overwater survey are displayed in map format, at a scale of 1:2,000 in Figures 3 to 5 of
the Appendix. The interpreted bathymetric elevation contour plan, illustrated in Figure 3 of the Appendix,
shows the interpreted ocean bottom contours. The interpreted bedrock surface elevation contour plan of
the area is illustrated in Figure 4 of the Appendix. Figure 5 of the Appendix, displays an isopach of the
sediment thickness overlying the bedrock surface. Additionally, seven marine refraction lines were
completed along the marina docks, the interpreted profles of these transects are illustrated at 1:500 scale
in Figures 6 to 12 in the Appendix. All results were calibrated to Tide and Chart datum elevations.
An example of acoustic profling data illustrating key sub-bottom refectors is illustrated in Figure 13. The
interpreted bedrock refector is shown in red. The shallow, blue line is the sea foor refector.
4.2 Discussion
In Figure 3, the results of the bathymetry survey shows the general ocean bottom confguration at a scale
of 1:2,000. The contour plan displays a generally fat-lying surface underlying the existing dock structures,
ranging from an elevation high of approximately -1.5 metres and reaching a low of approximately
-4 metres elevation. To the southeast of the existing marina, in the channel, depths to the ocean bottom
increase to approximately -5.5 metres elevation, likely due to dredging within the entrance channel.
The interpreted bedrock elevations are displayed in colour contour format in Figure 4. The bedrock
surface contours vary throughout the survey area, with an average elevation of -17 metres. The maximum
observed bedrock depth in the eastern area of the survey area is approximately -24 metres elevation.
Additional bedrock lows of note are observed in the southern portion of the survey area and beneath the
existing dock structures centred on location 490697E, 5460275N. Surrounding this bedrock low located
near the intersection of seismic line SL18-02 and SL18-04, interpreted bedrock elevations increase up to
-7 m. Another interpreted bedrock high, reaching approximately -12.5 m elevation is observed near the
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southeast end of the existing docks. The results of the marine seismic refraction indicate a compressional
wave velocity range of 2250 m/s to 2450 m/s for the interpreted bedrock. This velocity is consistent with
sedimentary sandstone bedrock, commonly encountered in the area.
An interpreted sediment isopach plan was prepared by contouring the thicknesses of sediments overlying
bedrock. The plot is illustrated in Figure 5, and displays an average sediment thickness of approximately
13 m. Underlying the proposed dock structures, thicknesses range from a maximum of 21.5 metres to a
minimum of approximately 8 metres. Calculated compressional (P) wave velocities for the overlying
sediments vary from 1680 m/s to 1900 m/s. The slower velocity of 1680 m/s is present over the middle of
the survey area, with higher velocities of 1900 m/s observed on the southeast, south and northwest edges
of the survey area. Higher velocities are indicative of an increase in compaction or density of the
sediments.
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5. Limitations
The depths to subsurface boundaries derived from seismic refraction surveys are generally accepted as
accurate to within ffteen percent of the true depths to the boundaries. In some cases, unusual geological
conditions may produce false or misleading data points with the result that computed depths to
subsurface boundaries may be less accurate. In seismic refraction surveying difculties with a 'hidden
layer' or a velocity inversion may produce erroneous depths. The frst condition is caused by the inability to
detect the existence of a layer because of insufcient velocity contrasts or layer thicknesses. A velocity
inversion exists when an underlying layer has a lower velocity than the layer directly above it. The
interpreted depths shown on drawings are to the closest interface location, which may not be vertically
below the measurement point if the refractor dip direction departs signifcantly from the survey line
location. Structural discontinuities occurring on a scale less than the hydrophone spacing or isolated
boulders would go undetected in the interpretation of the data. The seismic refraction method may not
detect a narrow canyon-like feature incised into bedrock, if the canyon width is narrow relative to the
depth of burial of the feature.
The depths to subsurface boundaries derived from overwater seismic sub-bottom profling surveys are
generally accepted as accurate to within ffteen percent of the true depths to the boundaries. In practice,
the seismic velocity of sub-bottom materials is not determined in the course of an overwater acoustic
profling investigation. Errors may arise from application of an assumed velocity for saturated materials to
determine the depths to sub-surface horizons when only the travel time to the horizon is known. An
underestimate of the velocity function would produce depths that are too shallow, and the reverse
occurring with an overestimate of velocity. True depths may be established by carrying out overwater
seismic refraction surveying or by determining velocities with known borehole intersections. Small errors
may also occur in data gridding. Additionally, near surface shallow refectors may be masked by strong
bathymetry returns in the data.
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The information in this report is based upon geophysical measurements and feld procedures and our
interpretation of the data. The results are interpretive in nature and are considered to be a reasonably
accurate representation of existing subsurface conditions within the limitations of the seismic refraction
and sub-bottom acoustic profling methods.
For: Frontier Geosciences Inc.
Caitlin Gugins, P.Geo.
Cliff Candy, P.Geo.
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486000E 487000E 488000E 489000E 490000E 491000E 492000E 493000E 494000E
5456
000N
5457
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5458
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5459
000N
5460
000N
5461
000N
5462
000N
5463
000N
5464
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SURVEYAREA
0 0.5 1 1.5 2
KILOMETRES
SCALE 1:50,000DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
GEOPHYSICAL SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
FIG. 1
SURVEY LOCATION PLAN
FIG. 2SCALE 1:2,500DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
SITE PLAN
GEOPHYSICAL SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
490350E 490400E 490450E 490500E 490550E 490600E 490650E 490700E 490750E 490800E 490850E 490900E 490950E 491000E 491050E
5459950N
5460000N
5460050N
5460100N
5460150N
5460200N
5460250N
5460300N
5460350N
5460400N
METRES
0 25 50 75 100BOAT TRACK
SEISMIC REFRACTION LINES
SUB-BOTTOM EXAMPLE PROFILE
SL18-01
SL18-02
SL18-03
SL18-04
SL18-05
SL18-06
SL18-7
NOTE: NAD83 ZONE 10
EXAM
PLE
LINE
12
SCALE 1:2,000DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
GEOPHYSICAL SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
-4
-4
-4
-4
-4
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490400E 490450E 490500E 490550E 490600E 490650E 490700E 490750E 490800E 490850E 490900E 490950E 491000E5460000N
5460050N
5460100N
5460150N
5460200N
5460250N
5460300N
5460350N
5460400N
METRES
0 20 40 60 80
ELEVATION (m)
-6.0
-4.7
-4.3
-3.9
-3.2
-2.7
-2.4
-2.0
FIG. 3
BATHYMETRIC ELEVATIONCONTOUR PLAN
NOTE: DATUM TIDE AND CHARTNAD83 ZONE 10
SCALE 1:2,000DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
GEOPHYSICAL SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
-20
-20
-20
-20
-20
-20
-20
-20
-20
-20
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490400E 490450E 490500E 490550E 490600E 490650E 490700E 490750E 490800E 490850E 490900E 490950E 491000E5460000N
5460050N
5460100N
5460150N
5460200N
5460250N
5460300N
5460350N
5460400N
METRES
0 20 40 60 80
ELEVATION (m)
-25
-22
-20
-19
-17
-16
-16
-14
-13
-8
FIG. 4
INTERPRETED BEDROCKELEVATION CONTOUR PLAN
NOTE: DATUM TIDE AND CHARTNAD83 ZONE 10
SCALE 1:2,000DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
GEOPHYSICAL SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
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490400E 490450E 490500E 490550E 490600E 490650E 490700E 490750E 490800E 490850E 490900E 490950E 491000E5460000N
5460050N
5460100N
5460150N
5460200N
5460250N
5460300N
5460350N
5460400N
METRES
0 20 40 60 80
0
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THICKNESS (m)
FIG. 5
INTERPRETED SEDIMENTTHICKNESS CONTOUR PLAN
NOTE: DATUM TIDE AND CHARTNAD83 ZONE 10
FIG. 6SCALE 1:500DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
INTERPRETED DEPTH SECTIONSL18-01
SEISMIC REFRACTION SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
800 1095 1350 1629 1828 2100 2300
1900 m/s1680 m/s 1680 m/s
2250 m/s
2250 m/s2250 m/s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24SL-2
0NW 10NW 20NW 30NW 40NW 50NW 60NW 70NW 80NW 90NW 100NW 110NWDISTANCE (m)
-30
-20
-10
0
10
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(m)
0 5 10 15 20
METRES
P-WAVE VELOCITY (m/s)
FIG. 7SCALE 1:500DATE: FEB. 2018
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INTERPRETED DEPTH SECTIONSL18-02
SEISMIC REFRACTION SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
1900 m/s
1680 m/s1680 m/s 1680 m/s
1680 m/s
2450 m/s
2450 m/s
2450 m/s2250 m/s
2250 m/s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24SL-1SL-3 SL-4 SL-6
0NE 10NE 20NE 30NE 40NE 50NE 60NE 70NE 80NE 90NE 100NE 110NE 120NE 130NE 140NE 150NE 160NE 170NE 180NE 190NE 200NE 210NE 220NEDISTANCE (m)
-30
-20
-10
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LEV
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(m)
0 5 10 15 20
800 1095 1350 1629 1828 2100 2300
METRES
P-WAVE VELOCITY (m/s)
FIG. 8SCALE 1:500DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
INTERPRETED DEPTH SECTIONSL18-03
SEISMIC REFRACTION SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
1900 m/s1900 m/s
1900 m/s1900 m/s
1900 m/s
2400 m/s
2400 m/s
2400 m/s 2400 m/s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 12 13 14 15 16 17 18 19 20 21 22 23 24SL-2
0NW 10NW 20NW 30NW 40NW 50NW 60NW 70NW 80NW 90NW 100NW 110NW 120NW 130NW 140NW 150NW 160NW 170NW 180NWDISTANCE (m)
-30
-20
-10
0
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CH
AR
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LEV
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(m)
0 5 10 15 20
800 1095 1350 1629 1828 2100 2300
METRES
P-WAVE VELOCITY (m/s)
FIG. 9SCALE 1:500DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
INTERPRETED DEPTH SECTIONSL18-04
SEISMIC REFRACTION SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
800 1095 1350 1629 1828 2100 2300
1680 m/s 1680 m/s
1900 m/s
2450 m/s 2450 m/s
2450 m/s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24SL-2
0NW 10NW 20NW 30NW 40NW 50NW 60NW 70NW 80NW 90NW 100NW 110NWDISTANCE (m)
-30
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LEV
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(m)
0 5 10 15 20
METRES
P-WAVE VELOCITY (m/s)
FIG. 10SCALE 1:500DATE: FEB. 2018
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INTERPRETED DEPTH SECTIONSL18-05
SEISMIC REFRACTION SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
800 1095 1350 1629 1828 2100 2300
1900 m/s1680 m/s
1680 m/s
2250 m/s2250 m/s
2250 m/s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24SL-6
0NE 10NE 20NE 30NE 40NE 50NE 60NE 70NE 80NE 90NE 100NE 110NEDISTANCE (m)
-30
-20
-10
0
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TID
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CH
AR
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LEV
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(m)
0 5 10 15 20
METRES
P-WAVE VELOCITY (m/s)
FIG. 11SCALE 1:500DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
INTERPRETED DEPTH SECTIONSL18-06
SEISMIC REFRACTION SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
1900 m/s
1680 m/s 1680 m/s
1680 m/s
2300 m/s
2300 m/s
2300 m/s2250 m/s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 16 17 18 19 20 21 22 23 24SL-2SL-5
0NW 10NW 20NW 30NW 40NW 50NW 60NW 70NW 80NW 90NW 100NW 110NW 120NW 130NW 140NW 150NW 160NWDISTANCE (m)
-30
-20
-10
0
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LEV
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(m)
0 5 10 15 20
800 1095 1350 1629 1828 2100 2300
METRES
P-WAVE VELOCITY (m/s)
FIG. 12SCALE 1:500DATE: FEB. 2018
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INTERPRETED DEPTH SECTIONSL18-07
SEISMIC REFRACTION SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOUVER YACHT CLUB
800 1095 1350 1629 1828 2100 2300
1900 m/s
1680 m/s1680 m/s
2250 m/s
2250 m/s
2250 m/s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
0NE 10NE 20NE 30NE 40NE 50NE 60NE 70NE 80NE 90NE 100NE 110NEDISTANCE (m)
-30
-20
-10
0
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CH
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LEV
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(m)
0 5 10 15 20
METRES
P-WAVE VELOCITY (m/s)
FIG. 13SCALE 1:500DATE: FEB. 2018
FRONTIER GEOSCIENCES INC.
SUB-BOTTOM SEISMIC PROFILELINE 12
GEOPHYSICAL SURVEY
COAL HARBOUR MARINA RECONFIGURATIONROYAL VANCOVUER YACHT CLUB
150NE 160NE 170NE 180NE 190NE 200NE 210NE 220NE 230NE 240NE 250NE 260NE 270NE 280NE 290NE 300NE 310NE 320NEDISTANCE (m)
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