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ALBERTA TRANSPORTATION
PEACE REGION (GRANDE PRAIRIE)
INSTRUMENTATION MONITORING RESULTS
SPRING 2016
SECTION C
SITE GP001-1: HWY 40:42, WAPITI HILL
1. OBSERVATIONS
1.1 Field Program and Instrumentation Status
Three slope inclinometers (SI-6, SI-8 and SI-9) and four pneumatic piezometers
(PN-9A, PN-9B, PN-21 and PN-23) were read at the Hwy 40:42 Wapiti Hill site on
June 11, 2016 by Mr. Niraj Regmi, G.I.T. and Mr. Mahinder Dhillon, P.Geo., both of
Thurber Engineering Ltd. (Thurber). Pneumatic piezometers PN-4 and PN-11 were not read.
The SIs were read using a RST Digital Inclinometer probe with a 2 ft. wheelbase and a
RST Pocket PC readout. Inclinometer reading depths were defined as per cable markings with
respect to the top of the inclinometer casing. The pneumatic piezometers were read using a
RST C108 pneumatic piezometer readout.
2. INTERPRETATION
2.1 General
SI plots for A and B directions are presented in Section D and are summarized below. Where
movement has been recorded, the resultant plot (X direction) and rate of movement have also
been provided.
4127 Roper Road, Edmonton, AB T6B 3S5 T: 780 438 1460 F: 780 437 7125 thurber.ca
Client: Alberta Transportation Date: June 22, 2016 File: 13353 e-file: \\H\13353 rpt GP001-1 - Edm Page 2 of 4
2.2 Zones of Movement
Zones of new movement were not observed in the SIs since the last set of readings in
the fall of 2015.
Zones of movement are summarized in Table GP001-1-1 at the end of this report. This table
also provides a historical account of the total movement, the depth of movement and the
maximum rate of movement that has occurred at this site since the initialization of the slope
inclinometers.
2.3 Interpretation of Monitoring Results
Slope inclinometer SI-6 showed no discernible movement since the fall of 2015 readings. SI-6 is
likely installed too shallow to detect the slide movement at its location.
SI-8 showed a rate of movement of 2.0 mm/yr over 1.8 m to 20.7 m depth since the fall of 2015
readings. SI-9 showed no discernible movement over 2.7 m depth to 7.0 m depth and 19.8 m
depth to 22.9 m depth.
Pneumatic piezometer PN-9A showed a decrease in groundwater level of 1.66 m since the fall
of 2015 readings. PN-9B, PN-21 and PN-23 showed increases in groundwater level of
0.76 m, 0.13 m and 0.09 m, respectively. Pneumatic piezometer results are summarized in
Table GP001-1-2 below and are plotted in Figures GP001-1-1 and GP001-1-2 in Section D.
3. RECOMMENDATIONS
3.1 Future Work
The instruments should be read again in the fall of 2016. The status of PN-4 and PN-11 should
be confirmed to see if repairs are possible.
3.2 Instrumentation Repairs
No instrument repairs are required at this time.
Client: Alberta Transportation Date: June 22, 2016 File: 13353 e-file: \\H\13353 rpt GP001-1 - Edm Page 3 of 4
TABLE GP001-1-1 SPRING 2016 – HWY 40:42 WAPITI HILL
SLOPE INCLINOMTER INSTRUMENTATION READING SUMMARY
Date Monitored: June 11, 2016
INSTRUMENT #
DATE INITIALIZED
TOTALCUMULATIVE RESULTANT
MOVEMENT AT NOTED DEPTH SINCE INITIAL
READING (mm)
MAXIMUM RATE OF
MOVEMENT (mm/yr)
CURRENT STATUS
DATE OF
PREVIOUS READING
INCREMENTAL MOVEMENT
SINCE PREVIOUS READING
(mm)
RATE OF MOVEMENT
(mm/yr)
CHANGE IN RATE OF
MOVEMENT SINCE
PREVIOUS READING (mm/yr)
SI-6 October 9,
1991 No discernible movement N/A Operational
October 3, 2015
N/A N/A N/A
SI-8 October 9,
1991
24.7 mm over 1.8 m to 20.7 m depth in 1°
direction
26.6 in September
2014 Operational
October 3, 2015
1.4 2.0 -3.5
SI-9 June 16, 1992
15.6 mm over 2.7 m to 7.0 m depth in 84°
direction
5.8 in October 1996
Operational October 3,
2015
No discernible movement
N/A N/A
4.0 mm over 19.8 m to 22.9 m depth in 84°
direction
4.5 in October 1997
No discernible movement
N/A N/A
Drawing 13353-GP001-1-1 in section D provides a sketch of the approximate location of the monitoring instrumentation for this site.
Client: Alberta Transportation Date: June 22, 2016 File: 13353 e-file: \\H\13353 rpt GP001-1 - Edm Page 4 of 4
TABLE GP001-1-2 SPRING 2016 – HWY 40:42 WAPITI HILL
PNEUMATIC PIEZOMETER INSTRUMENTATION READING SUMMARY
Date Monitored: June 11, 2016
INSTRUMENT #
DATE INITIALIZED
TIP ELEV.
(m)
GROUND ELEV.
(m)
CURRENT STATUS
MAXIMUM PORE
PRESSURE (kPa)
MEASURED PORE
PRESSURE (kPa)
CURRENT WATER
ELEVATION (m)
PREVIOUS WATER
ELEVATION (m)
CHANGE IN WATER LEVEL
SINCE PREVIOUS READING
(m)
PN-4 June 13, 1997 606.19 618.99 Operational 84.0 in May 2015 Instrument not read
N/A 612.51 N/A
PN-9A June 13, 1997 609.96 618.96 Operational 49.0 in May 2015 18.7 611.87 613.53 -1.66
PN-9B June 13, 1997 599.46 618.96 Operational 112.3 in
September 2002 87.5 608.38 607.62 0.76
PN-11 May 21, 1998 608.44 623.64 Operational 65.0 in May 2015 Instrument not read
N/A 614.05 N/A
PN-21 October 20, 2004 581.97 615.47 Operational 5.3 in June 2016 53 582.51 582.38 0.13
PN-23 October 20, 2004 579.11 617.21 Operational 45.0 in May 2015 18.9 581.04 580.95 0.09
Drawing 13353-GP001-1-1 in section D provides a sketch of the approximate location of the monitoring instrumentation for this site. Notes: PN - pneumatic piezometer.
ALBERTA TRANSPORTATION PEACE REGION (GRANDE PRAIRIE)
INSTRUMENTATION MONITORING RESULTS
SPRING 2016
SECTION D
DATA PRESENTATION
SITE GP001-1: HWY 40:42, WAPITI HILL
PN-21
PN-23
PN-11
PN-4
PN-9A/9B
SI-6
SI-8
SI-9
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SCALE
DESIGNED BY
DRAWN BY
DATE
APPROVED BY
FILE No.
ML
NFR
DWP
1:1500
JULY 2016
13353
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P001-1.dw
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DWG No. 13353-GP001-1-1
PEACE REGION (GRANDE PRAIRIE) 2016
GP001-1: HWY 40:42 WAPITI HILL
INSTRUMENT LOCATIONS
LEGEND
APPROXIMATE INSTRUMENT LOCATION
SLOPE INCLINOMETERSI
PNEUMATIC PIEZOMETERPN
GROUND SURFACE CONTOUR (2m INTERVAL)
SCALE 1:1500
400 20 60 80 m
BASE PLAN PROVIDED BY ALBERTA TRANSPORTATION