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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DESIGNED BY

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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