AMEC Environment & Infrastructure A division of AMEC Americas Limited 140 Quarry Park Blvd. SE Calgary, AB, CANADA T2C 3G3 Tel +1 (403) 248-4331 Fax +1 (403) 248-2188 www.amec.com R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011 Report\Fall 2011 AT Monitoring - S37,FINAL,tc,bb.ab.doc Page 1 December 19, 2011 CG25352.300 Mr. Ross Dickson Alberta Transportation 2 nd Floor, 803 Manning Road NE Calgary, AB T2E 7M8 Dear Ross: Re: Southern Region Geohazard Assessment Fall 2011 Instrumentation Monitoring Results Site S37: Highway 533:02, Springhill Creek Slumps This letter documents the Fall 2011 instrument readings at the above-noted site and presents an updated site plan sketch, instrument data, and plots. 1.0 OBSERVATIONS 1.1 Field Program and Instrumentation Status Two slope inclinometers (SI’s) were read at the S37 – Highway 533:02 site on November 1, 2011 by Mr. Tyler Clay, EIT of AMEC Environment & Infrastructure (AMEC), a division of AMEC Americas Limited. The SI’s were read using a metric Slope Indicator probe and Digitilt Datamate readout manufactured by Durham Geo Slope Indicator (DGSI). Inclinometer reading depths were referenced to the top of the SI casing. Please refer to the attached Figure S37-1 for a site plan showing the instrument locations. The instruments at the site were installed following a call-out inspection performed at the site on February 18, 2010 1 . The site has been exhibiting cracking across the road surface and slumping in the southeast embankment slope. The slumping of the embankment slope was interpreted as shallow landslide movement, and the cracking across the road surface was interpreted as deeper movement involving much of the road embankment. The instrument installations were recommended to confirm these assumptions and to establish ongoing monitoring of slope movement and groundwater pressure at the site. 1 AMEC report, “Hwy 533:02 – KM 22 Hill Slumps, Report of February 18, 2010 Site Inspection”, submitted to Alberta Transportation, March 2010, AMEC File No. CG25309.D.
Transcript
AMEC Environment & Infrastructure A division of AMEC Americas Limited 140 Quarry Park Blvd. SE Calgary, AB, CANADA T2C 3G3 Tel +1 (403) 248-4331 Fax +1 (403) 248-2188 www.amec.com
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011
Report\Fall 2011 AT Monitoring - S37,FINAL,tc,bb.ab.doc
Page 1
December 19, 2011
CG25352.300
Mr. Ross Dickson
Alberta Transportation
2nd Floor, 803 Manning Road NE
Calgary, AB T2E 7M8
Dear Ross:
Re: Southern Region Geohazard Assessment
Fall 2011 Instrumentation Monitoring Results
Site S37: Highway 533:02, Springhill Creek Slumps
This letter documents the Fall 2011 instrument readings at the above-noted site and presents
an updated site plan sketch, instrument data, and plots.
1.0 OBSERVATIONS
1.1 Field Program and Instrumentation Status
Two slope inclinometers (SI’s) were read at the S37 – Highway 533:02 site on November 1,
2011 by Mr. Tyler Clay, EIT of AMEC Environment & Infrastructure (AMEC), a division of AMEC
Americas Limited.
The SI’s were read using a metric Slope Indicator probe and Digitilt Datamate readout
manufactured by Durham Geo Slope Indicator (DGSI). Inclinometer reading depths were
referenced to the top of the SI casing.
Please refer to the attached Figure S37-1 for a site plan showing the instrument locations.
The instruments at the site were installed following a call-out inspection performed at the site on
February 18, 20101. The site has been exhibiting cracking across the road surface and slumping
in the southeast embankment slope. The slumping of the embankment slope was interpreted as
shallow landslide movement, and the cracking across the road surface was interpreted as
deeper movement involving much of the road embankment. The instrument installations were
recommended to confirm these assumptions and to establish ongoing monitoring of slope
movement and groundwater pressure at the site.
1 AMEC report, “Hwy 533:02 – KM 22 Hill Slumps, Report of February 18, 2010 Site Inspection”,
submitted to Alberta Transportation, March 2010, AMEC File No. CG25309.D.
Alberta Transportation Fall 2011 Instrumentation Monitoring Results Southern Region Site S37 – Highway 533:02, Springhill Creek Slumps December 19, 2011
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011
Report\Fall 2011 AT Monitoring - S37,FINAL,tc,bb.ab.doc
Page 2
2.0 INTERPRETATION AND RECOMMENDATIONS
2.1 General
Plots of the instrument data are presented in the attached figures, and summarized in the following sections.
2.2 Zones of Movement
No active movement zones have been identified.
2.3 Interpretation of Monitoring Results and Recommendations
2.3.1 Interpretation
SI 10-1 (Figures S37-2 and S37-3)
• There was apparent downslope movement between 4 to 10 m depth during the period between April 14 and May 27, 2010, but without a distinct shear zone. There has been no movement detected at this zone since. The movement prior to May 2010 is judged to be due to settlement of the borehole backfill. No movement zones have been confirmed to date.
SI 10-2 (Figures S37-4 and S37-5)
• The May 2010 readings showed apparent movement in the upper 2.5 m; however, this
was likely due to settlement around a casing extension that was installed after the initial reading set, as noted on the installation record. No other movement zones have
been detected as of the November 2011 readings.
Vibrating Wire Piezometers VW 10-3 and VW 10-4 (Figure S37-6 and Tables S37-3 and S37-4)
The piezometers could not be located, and are likely buried under road debris. For reference,
the May 2011 readings of these piezometers showed equivalent piezometric depths as follows:
• VW 10-3 –approximately 10.8 m below ground surface.
• VW 10-4 –approximately 8 m below ground surface.
Based on the May 2011 piezometer readings, it appears that groundwater seepage is occurring downwards through the site area, with probable discharge zones at the creek level.
2.3.2 Recommendations
The SI’s have not shown any confirmed ground movement since the initial readings in
April 2010. There has been active movement observed near the scarps along the slope
adjacent to the road; however, there has been relatively little additional damage to the road
surface during the same period. Therefore, it is recommended that the reading frequency for
Alberta Transportation Fall 2011 Instrumentation Monitoring Results Southern Region Site S37 – Highway 533:02, Springhill Creek Slumps December 19, 2011
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011
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this site be reduced to annual readings, with the next readings scheduled for Fall 2012. If
ground movement is confirmed from future readings or damage to the road surface is observed
during the 2012 annual inspection or from the MCI, the monitoring and inspection frequency
should be revaluated.
3.0 INSTRUMENTATION REPAIRS AND MAINTENANCE REQUIRED
The piezometers should be recovered using a metal detector during the next reading cycle. No
repairs are required at this time.
Alberta Transportation Fall 2011 Instrumentation Monitoring Results Southern Region Site S37 – Highway 533:02, Springhill Creek Slumps December 19, 2011
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011 Report\Fall 2011 AT Monitoring - S37,FINAL,tc,bb.ab.doc
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TABLE S37-1
FALL 2011 – Springhill Creek Slumps
Slope Inclinometer Instrumentation
Reading Summary
Date Monitored: November 1, 2011
INSTRUMENT
NAME AND
COORDINATES
(UTM*)
DATE
INITIALIZED
TOTAL
CUMULATIVE
RESULTANT
MOVEMENT AT
DEPTH SINCE
INITIAL
READING
MAXIMUM
RATE OF
MOVEMENT
CURRENT
STATUS
DATE OF
PREVIOUS
READING
SINCE PREVIOUS READING
INCREMENTAL
MOVEMENT
RATE OF
MOVEMENT
CHANGE IN
RATE OF
MOVEMENT
SI 10-1
(290164 E,
5576815 N)
April 14, 2010
No confirmed
movement to
date.
n/a Operational May 2011 n/a n/a n/a
SI 10-2
(290245 E,
5576874 N)
April 14, 2010
No confirmed
movement to
date.
n/a Operational May 2011 n/a n/a n/a
*NAD 83 UTM Zone 12U coordinate system
Alberta Transportation Fall 2011 Instrumentation Monitoring Results Southern Region Site S37 – Highway 533:02, Springhill Creek Slumps December 19, 2011
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011 Report\Fall 2011 AT Monitoring - S37,FINAL,tc,bb.ab.doc
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TABLE S26-2
Fall 2011 – Springhill Creek Slumps
Piezometer Instrumentation, Reading Summary
Date Monitored: November 1, 2011
INSTRUMENT
TIP SERIAL
NUMBER AND
COORDINATES
(UTM*)
DATE
INITIALIZED
TIP DEPTH
BGS
(m)
GROUND
ELEVATION
(m)
CURRENT
STATUS
MINIUMUM
EQUIVALENT
PIEZOMETRIC
DEPTH BGS
(m)
CURRENT
EQUIVALENT
PIEZOMETRIC
DEPTH BGS
(m)
PREVIOUS
EQUIVALENT
PIEZOMETRIC
DEPTH BGS
(m)
CHANGE IN
CALCULATED
EQUIVALENT
PIEZOMETRIC
DEPTH SINCE
PREVIOUS READING
(m)
PORE WATER
PRESSURE
RATIO
(ru)
10-3
(serial no.
10-1150)
(290185 E,
5576835 N)
March 30, 2010 19.2
n/a Operational 10.75
(May 2011) N/A 10.75 N/A 0.24
10-4
(serial no.
10-1151)
(290209 E,
5576849 N)
March 30, 2010 12
n/a Operational 5.96
(October 2010) N/A 8.04 N/A 0.18
*NAD 83 UTM Zone 12U coordinate system
Alberta Transportation Fall 2011 Instrumentation Monitoring Results Southern Region Site S37 – Highway 533:02, Springhill Creek Slumps December 19, 2011
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011
Report\Fall 2011 AT Monitoring - S37,FINAL,tc,bb.ab.doc
Page 6
4.0 CLOSURE
This report has been prepared for the exclusive use of Alberta Transportation for the specific
project described herein. Any use which a third party makes of this report, or any reliance on or
decisions to be made based on it are the responsibility of such third parties. AMEC Environment
& Infrastructure, a division of AMEC Americas Limited, cannot accept responsibility for such
damages, if any, suffered by any third party as a result of decisions made or actions based on
this report. This report has been prepared in accordance with accepted geotechnical
engineering practices. No other warranty, expressed or implied, is made.
We trust that this meets your needs at this time. Please contact the undersigned if you have any
questions or require any further information.
Respectfully Submitted,
AMEC Environment & Infrastructure,
a division of AMEC Americas Limited
[ORIGINAL SIGNED AND STAMPED ON DECEMBER 19, 2011]
Tyler Clay, B.A.Sc., EIT Bryan Bale, M.Sc., P.Eng.
Geological Engineer Geotechnical Engineer
Reviewed by: APEGGA Permit to Practice No. P-04546
Andrew Bidwell, M.Eng., P.Eng.
Associate Geological Engineer
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011
Report\Fall 2011 AT Monitoring - S37,FINAL,tc,bb.ab.doc
SECTION D
Southern Region Geohazard Assignment
Site S37 – Springhill Creek Slumps
Fall 2011 Instrument Data and Plots
to Nanton, AB
to Hwy 22/Chain Lakes
BH 10-1
BH 10-2
BH 10-3
BH 10-4
Notes: 1. All borehole locations surveyed by hand-held GPS with ±6-10 m
accuracy, relative to NAD 83 UTM Zone 12U coordinate system.
BH 10-1 (SI) - 290164 E, 5576815 NBH 10-2 (SI) - 290245 E, 5576874 N
BH 10-1
Client
Project Revision
Figure S37-1
Date:
Dec-11Job No.
File No.:
CG25352.300
Hwy 533:02 - Springhill Creek Slumps
Site Plan and Cross-Sections
Alberta Transportation
BH 10-2 (SI) - 290245 E, 5576874 NBH 10-3 (VW) - 290185 E, 5576835 NBH 10-4 (VW) - 290209 E, 5576849 N
24
22
20
18
16
14
12
10
8
6
4
2
0
Depth
(m)
-50 -25 0 25 50
24
22
20
18
16
14
12
10
8
6
4
2
0
-50 -25 0 25 50
24
22
20
18
16
14
12
10
8
6
4
2
0
Depth
(m)
-10 -5 0 5 10
24
22
20
18
16
14
12
10
8
6
4
2
0
-10 -5 0 5 10
LEGEND
Initial 14 Apr2010
27 May2010
13 Oct2010
2 May2011
1 Nov2011
Towards 148°
Figure S37-2
Towards 148°
Cumulative Deflection
Direction A
Deflection (mm)
Incremental Deflection
Direction A
Deflection (mm)
Ref. Elevation m
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011 Data\SI 10-1.gtl
Hwy 533:02 - Springhill CreekSlumps, Inclinometer SI 10-1
Alberta Transportation
AMEC Environment & Infrastructure - Calgary, AB
24
22
20
18
16
14
12
10
8
6
4
2
0
Depth
(m)
-50 -25 0 25 50
24
22
20
18
16
14
12
10
8
6
4
2
0
-50 -25 0 25 50
24
22
20
18
16
14
12
10
8
6
4
2
0
Depth
(m)
-10 -5 0 5 10
24
22
20
18
16
14
12
10
8
6
4
2
0
-10 -5 0 5 10
LEGEND
Initial 14 Apr2010
27 May2010
13 Oct2010
2 May2011
1 Nov2011
Towards 238°
Figure S37-3
Towards 238°
Cumulative Deflection
Direction B
Deflection (mm)
Incremental Deflection
Direction B
Deflection (mm)
Ref. Elevation m
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011 Data\SI 10-1.gtl
Hwy 533:02 - Springhill CreekSlumps, Inclinometer SI 10-1
Alberta Transportation
AMEC Environment & Infrastructure - Calgary, AB
24
22
20
18
16
14
12
10
8
6
4
2
0
Depth
(m)
-50 -25 0 25 50
24
22
20
18
16
14
12
10
8
6
4
2
0
-50 -25 0 25 50
24
22
20
18
16
14
12
10
8
6
4
2
0
Depth
(m)
-10 -5 0 5 10
24
22
20
18
16
14
12
10
8
6
4
2
0
-10 -5 0 5 10
LEGEND
Initial 14 Apr2010
27 May2010
13 Oct2010
2 May2011
1 Nov2011
Towards 168°
Figure S37-4
Towards 168°
Cumulative Deflection
Direction A
Deflection (mm)
Incremental Deflection
Direction A
Deflection (mm)
Ref. Elevation m
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011 Data\SI 10-2.gtl
Hwy 533:02 - Springhill CreekSlumps, Inclinometer SI 10-2
Alberta Transportation
AMEC Environment & Infrastructure - Calgary, AB
24
22
20
18
16
14
12
10
8
6
4
2
0
Depth
(m)
-50 -25 0 25 50
24
22
20
18
16
14
12
10
8
6
4
2
0
-50 -25 0 25 50
24
22
20
18
16
14
12
10
8
6
4
2
0
Depth
(m)
-10 -5 0 5 10
24
22
20
18
16
14
12
10
8
6
4
2
0
-10 -5 0 5 10
LEGEND
Initial 14 Apr2010
27 May2010
13 Oct2010
2 May2011
1 Nov2011
Towards 258°
Figure S37-5
Towards 258°
Cumulative Deflection
Direction B
Deflection (mm)
Incremental Deflection
Direction B
Deflection (mm)
Ref. Elevation m
R:\Projects\Calgary Geo\CG25XXX - AT Projects\CE061_2008\CG25352 - AT Southern Region 2011\300 - Monitoring\SI Data + reports\S37- Highway 533\Fall 2011 Data\SI 10-2.gtl
Hwy 533:02 - Springhill CreekSlumps, Inclinometer SI 10-2
Alberta Transportation
AMEC Environment & Infrastructure - Calgary, AB
0
5
10
15
20
De
pth
Be
low
Gro
un
d S
urf
ac
e (
m)
BH10-3 BH10-3 Tip Elevation
Approximate Ground Surface
Client
Project Revision
Hwy 533:02 Springhill Creek SlumpsDate:
Dec-11
Equivalent Piezometric Depth Measured at
BH 10-3 and BH 10-4
Job No.
CG25352.300File No.:
Alberta Transportation Figure S37-6
25
De
pth
Be
low
Gro
un
d S
urf
ac
e (
m)
BH10-3 BH10-3 Tip Elevation
BH10-4 BH10-4 Tip Elevation
Table S37-3 - BH 10-3
PROJECT:
File No. CG25333
DESCRIPTION: Hwy 533:02 - Springhill Creek Slumps
PIEZOMETER:
NUMBER: 10-1150
A: -1.91E-04 B: 2.64E-02 C: 1.47E+03
STATION: LOCATION:
SOIL TYPE: CLAY TILL SOIL DENSITY (AVG.): 1.79
ELEVATION INITIAL GROUND: n/a PIEZOMETER TIP DEPTH (m): 19.2DATE PRESENT FREQUENCY TEMP. PRESSURE DEPTH TO Ru Rue REMARKS
GROUND READING READING CALCULATEDELEV. WATER LEVEL
