amerfJ - City of Quesnel · amerfJ 26 J:nua~) KX03904 ~-----,- ... Inclinometer installations ... SI-7 Pierce Crescent also an apparent but gradual systematic shift evident on the

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26J:nua~ )KX03904...'-,-~----

Director of Public WorksCity of Quesnel405 Barlow AvenueQuesnel, BC V2J 2C3

Dear Mr. Jack Marsh

RE: PROJECT UPDATEWEST QUESNEL STABILITY STUDY

1.0 INTRODUCTION

This purpose of this letter is to provide the City of Quesnel (CoQ) with a project update for theWest Quesnel Stability Study on which work was commenced by AMEC Earth & Environmentallimited (AMEC) in September, 2000. The following tasks have been complete~:

. Inclinometer installations (SI) SI-1 through SI-7Survey of SI locationsAn initial reading and two additional readings of each SI with the exception of SI-4 andSI-5 which have had three additional readings completed

.

.

Figure 1 shows the approximate locations of SI-1 through SI-7.

2.0 SI READING SCHEDULE

Table 1 summarizes the SI reading schedule to date:Table 1: SI Reading Schedule

*The Aa Groove azimuth refers to the direction of the A channel groove in the SI casing which is aligned parallel to the downslope

dip of the slope

AMEC Earth & Environmental Limited610 Richard RoadPrince George, BC V2K 4L3Tel +1 (250) 564-3243Fax +1 (250) 562-7045 www.amec.com

Borehole: 51-1 51-2 51-3 51-4 51-5 51-6 51-7

Avery Lane Avery Lane Abbott DriveVoyager

Abbott DrivePierce

Location (Lower (Higher (near School (near Dixon StreetCrescent

Elevation) Elevation) Bettcher) Flamingo}Aa' Groove 120' 120' 120' 110' 110' 105' 100'

Azimuth

Depth Read142 ft, 244 ft, 334 ft, 504 ft, 474 ft, 502 ft, 410ft,43 m 74 m 102 m 154 m 145 m 153 m 125 m

Finish of25 Oct., 23 Oct., 27 Oct., 13 Oct., 50ct., 16 Oct., 19 Oct.,Installation!

Grouting2000 2000 2000 2000 2000 2000 2000

Initial Reading 21 Nov" 21 Nov., 21 Nov., 3 Nov., 28 Oct., 22 Nov., 22 Nov.,Date 2000 2000 2000 2000 2000 2000 2000

First Reading:7 Dec., 7 Dec., 6 Dec., 24 Nov., 24 Nov., 6 Dec" 7 Dec.,2000 2000 2000 2000 2000 2000 2000

Second 12 Jan., 11 Jan., 12 Jan., 6 Dec., 6 Dec., 11 Jan., 12 Jan.,Reading 2001 2001 2001 2000 2000 2001 2001

Third Reading11 Jan., 12 Jan.,

2001 2001

c;ity of QuesnelWest Quesnel Stability StudyJanuary 26, 2001KX03904Page 2

amec!1

3.0 SI READING RESULTS

Attached in Appendix A are the results of the SI readings to date. The SI readings arepresented in cumulative and incremental plotswith a 50 mm horizontal scale. The incrementalplots show the individual changes in inclination of the casing at each reading elevation. Thecumulative plots are constructed by adding together the incremental changes starting from thebottom of the hole and show the overall apparent movement of the SI casing at each elevationrelative to the bottom of the hole.

Two channels of readings are presented: A and B. The A channel is oriented to be "downslope"whereas the B channel is across slope. The actual orientation of each of the casings is shownon Figure 1 and summarized in Table 1. Positive movements on the Cumulative Plots aredownslope on Channel A and across the slope to the right when looking downhill for Channel B.

Table 2 presents AMEC's preliminary observations based on the limited data gathered to date.

Table 2: SI Data Observations

AMEC emphasizes to the CoO that the readings to date have shown relatively smalldisplacements (with the exception of SI-5) and should be considered very preliminary. Due tothe extreme depth of the installation and winter monitoring conditions it is likely that some of thepreliminary data may be showing the effects of temperature variation, grout casing adjustmentinstrument drift, depth offset and/or rotation errors. AMEC has presented the raw data in theattached plots and has not applied any corrections. Future readings will allow AMEC to isolate

SI Location SI Data ObservationsDeformations of up to 7 mm have been observed from depths ranging from

SI-1 Avery Lane (Lower 12 to 29 m. There was little or no net deflection of the top of the casing.Installation) These changes are consistent with settlement and at this time do not appear

to indicate shear movements.

SI-2 Avery Lane (UpperA downhill deflection of 1 mm was observed at about 60 m depth.

Installation)Abbott Drive

SI-3 (near Bettcher Deformations of up to 2 mm were observed at about 38 m depth and

Street) deformations of up to 1 mm were observed at about 54 m depth.

Deformations of up to 4 mm were observed at about 50 m depth. PleaseSI-4 Voyager School note that there is an instrument error in the lower portion of the data set for 11

January, 2000.

Abbott Drive (nearSignificant deflections of up to 50 mm were observed in a zone from 36 to 93

SI-5Flamingo Drive)

m depth. The profile of the cumulative deflection plot indicates that SI-5 maybe experiencing vertical compression or settlement.

Deformations of up to 3 mm were observed at about 28 m depth. There wasSI-6 Dixon Street also an apparent but gradual systematic shift evident on the plots. This may

be due to a depth, offset, rotation or temperature effect.

Deformations of up to 2 mm were observed at about 68 m depth. There was

SI-7 Pierce Crescent also an apparent but gradual systematic shift evident on the plot of the dataset for 12 January, 2000. This may be due to a depth, offset, rotation ortemperature effect.

City of QuesnelWest Quesnel Stability StudyJanuary 26, 2001KX03904Page 3

ame&and apply corrections for these factors and get a true picture of how much of the SI deformationmay be attributable to lateral ground movement.

4.0 FUTURE WORK

Given the nature of the movements observed to date, AMEC expects to monitor the 51's for atleast another six months (specifically during the spring when landslide movements are typicallyhighest) before proceeding to Stage 2 of the West Quesnel Stability Study, the more detailedsoils investigation.

5.0 CLOSURE

Thank you for the opportunity to provide assistance in this matter. Should you have anyquestions of comments please contact Mr. Nick Polysou at 1-250-564-3243.

Respectfully submitted,

AMEe~rth,& Environmental Limited. f,' .""f~:'S/~....

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Reviewed by:

Mr. Doug Dewar, M.Sc., P.Eng.Geotechnical Engineer

Mr. Drum Cavers, P.Eng., M.Eng., P.Geo.Principal Engineer

j;[IMr. Nick Polysou, P.Eng.Senior Geotechnical EngineerManager Prince George Region

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ameCity of Quesnel

West QuesnelStabilityStudy

Quesnel, BC

Figure 1: Slope Inclinometer (SI) LocationsDATE:

Jan.2001SCALE:

IDRAWN BY:

NTS HMNPROJECT No: KXO39O4

0 300 600 900

SCALE (m)

ApproximateOrientation of AChannel in SI casings

ame&

APPENDIX A

51 READING RE5ULT5

-500

20

40

00

Depth

(m)

80

100

120

140

-50

AMEC Earth and Environmental -Pr. George

-25

Deflection (mm)

0 25T

...L

-25 0 25

Incremental Deflection

Direction A

50 LEGEND0

Initial

!'f---!'J

~

20

40

00

80

100

120

140 Ref. Elevation 0

50

21 Nov2000

7 DecZXXJ

12 Jan2001

-500

20

40

00

Depth

(m)

80

100

120

140

-50

-25""I

Deflection (mm)

0

~

...L

-25 0


Direction B

KX039O4 W. Quesnel Stability Study, Inclinometer SI-1

Lower Avery Lane

25 500

20

40

00

80

100

120

140

..L25 50

20

40

60

Depth

(m)

80

100

120

140

-500

Deflection (mm)

0 25T

-25

T

~

-50 -25 0 25

Cumulative Deflection

Direction A

AMEC Earth and Environmental - Pr.George

-500

20

-25

Deflection (mm)

0

40 40

-25 0

100 100


Direction B

KXO3904W. Quesnel Stability Study, Inclinometer SI-1

Lower Avery Lane

120 120

140 Ref. Elevation 0 140

50 -50

25 500

20

40

60

80

100

120

140

25 50

50LEGEND0

tnitial 21Nov2OOO

&----fJ 7 Dec2000

'i9---'U 12 Jan2001

20

60 60

Depth

(m)

80 80

20

40

60

Depth

(m)

80

100

120

140

AMEC Earth and Environmental - Pr. George

-500

-25-,-

Deflection (mm)

0 25T

..5Q -25 250


Direction A

40

60

80

100

120


50

-500

20

40

60

Depth

(m)

80

100

120

140

-50

-25,.....

Deflection (mm)

0

-L.25 0


Direction B

KXO3904 W. Quesnel Stability Study, Inclinometer SI-2

Upper Avery Lane

25T

500

20

40

60

80

100

120

140

..L25 50

50LEGEND0

Initial 21 Nov2aXJ

G------l'J 7 Dec2OCO

'I'----'U 11 Jan200120

-500

20

40

60

Depth

(m)

80

100

120

140

-50

-25,.

Deflection (mm)

0 25"I

-L-25

L

250


Direction A


-500


Upper Avery Lane

20

40 40

100 100

120 120


-25T

Deflection (mm)

0 25 500

20

40

60

80

100

120

140

I

50 -50 25 50-25 0


Direction B

50LEGEND0

Initial 21 Nov2OOJ

I.'J------EJ 7 Dec2000

'iI'----'U 11 Jan2001

20

60 60

Depth

(m)

80 80

-SO0

20

40

&>

Depth

(m)

80

100

120

140

..so


-25T

Deflection (mm)

0

Deflection (mm)

0 2525T

..so0

-25T

20

40 40

&> &>

Depth

(m)

80 80

100 100

120 120

---L-25 250


Direction A


Direction B

KX03904 W. Quesnel Stability Study, Inclinometer SI-3

Abbott Drive near Bettcher

so0

20

40

&>

80

100

.'120

140

50

soLEGEND0Initial 21 Nov2000

G----f] 6 Dec2COO

'<P-----"U 12 Jan2001

20

140140 Ref. Elevation0

L0

I

-SO -25

I

25 50

20

40

60

Depth

(m)

80

100

120

140

..sO0

Deflection (mm)

0 25T

-25

-50 -25 250


Direction A


-500

-25.-

Deflection (mm)

0

20 20

-25 0

40 40


Direction B


Abbott Drive near Bettcher

100 100

120 120


50 -50

25T

500

20

40

60

80

100

-'120

140

-L25 50

50LEGEND0

Initial 21 Nov2000

6 Dec2000

'II'-----'il7 12 Jan2001

60 60

Depth

(m)

80 80

-500

20

40

60

Depth

. (m)

80

100

120

140

-50

-25

Deflection (mm)

0


25,.

25


Direction A

Isr

..L-25 0

40

60

80

100

120


50

-500

20

40

60

Depth

(m)

80

100

120

140

-50

Deflection(mm)

-25 0 25

I M I

...L

-25 0


Direction B

KXO3904 W.Quesnel Stability Study. Inclinometer SI-4

Voyageur School

500

20

40

60

80

100

120

140

25 50

50LEGEND0

Initial 3 Nov2COO

G--I'J 24 Nov2COO

6 Dec2CXXJ

20 +---+ 11 Jan2001

-500

20

40

60

Depth

(m)

80

100

120

140

-50


-25Deflection (mm)

0 25

--L-25

~0 25


Direction A

40

60

80

100

120


50

-500

20

40

60

Depth

(m)

80

100

120

140

-50

-25

Deflection (mm)

0

-25 0


Direction B

KXO3904W.Quesnel Stability Study, Inclinometer SI-4

Voyageur School

25 500

20

40

ID

80

100

120

140

25 50

50LEGEND0

Initial 3 Nov2000

B-------fl 24 Nov2000

'11"---"/1' 6 Dec2CXX>

20 +---+ 11 Jan2001

-500

20

40

ro

Depth

(m)

80

100

120

140

-25

Deflection (mm)

0

-50 -25 0


25

25


Direction A

40

ro

80

100

120


so

-so0

20

40

ro

Depth

(m)

80

100

120

140

-50

-25

Deflection (mm)

0 25

-25 0


Direction B

KXO3904 W. Quesnel Stability Study, Inclinometer SI-5.,.,-_u ,..-

so0

20

40

ro

80

100

120

140

25 so

soLEGEND0

Initial 28Oct2OOQ

['t---E] 24 Nov2000

6 Dec2000

20 +---+ 12 Jan2001

-&)0

20

40

re

Depth

(m)

80

100

120

140


-25Deflection (mm)

0 25

-&) 0 25-25


Direction A

40

60

80

100

120


50

-&)0

20

40

60

Depth

(m)

80

100

120

140

-25

Deflection (mm)

0 500

25

20

40

80

100

120

140

-&) -25 500 25


Direction B


Abbott Drive

50LEGEND0

Initial 28 Oct2CXX)

I9-----EJ 24 Nov2000

'I1"---'Ii' 6 Dec2CXXJ

20 +--+ 12 Jan2OD1

-500


-25Deflection (mm)

0 25

20

40

60

Depth

(m)

80

100

120

140

-50

t-

...L

-25I

0 25


Direction A

40

-500

20

40

100

120


50

100

120

-25T

Deflection (mm)

0 25T

500

20

40

60

80

100

120


Direction B

KXO3904W.QuesnelStabiJity Study, Inclinometer SI-6

End of Dixon Street

50LEGEND0

Initial 22 Nov2CXXJ

I!I------!'] 6 Dec2CXXJ

'P----'U 11 Jan200120

60 60

Depth

(m)

80 80

,.or I rI I

-50 -25 0 25 50

AMEC Earth and Environmental- Pr. George

-500

Deflection (mm)

0 25-25

Depth

(m)

20

40

60

80

100

120

140

-50 25-25 0


Direction A

500

-500

20

40

60

Depth

(m)

80

100

120

140

-50

-25

Deflection (mm)

0 500

20

40

60

80

100

120


50

25

20

40

60

80

100

120

140

-25 25 500


Direction B

KXO3904 W.Quesnel Stability Study, Inclinometer SI-6

End of Dixon Street

I

I

I

I I

I I

I

I

I

I

LEGEND

Initial 22 Nov2OOO

[9------£] 6 Dec2OOJ

'I'--'U 11 Jan2001

-500

20

40

00

Depth

(m)

80

100

120

140

-50

AMEC.Earth and Environmental- Pr. George

-25,-

Deflection (mm)

0 25,.

...L-25

..L250


Direction A

40

00

80

100

120


50

-500

-25

Deflection (mm)

0

20

40

00

Depth

(m)

80

100

120

140

-50 -25 0


Direction B


Pierce Crescent & Lewis Drive

25T

500

20

40

00

80

100

120

140

..L25 50

50LEGEND0

Initial 22 Nov2OOO

&----t'J 7 DecZOOO

12 Jan2001

20

-500


-25Deflection(mm)

0 25

20

40

aJ

Depth

(m)

80

100

120

140

-50-L.-25

..L250


Direction A

40

aJ

80

100

120

140 Ref. Elevation0

50

-500

20

40

aJ

Depth

(m)

80

100

120

140

-25.-Deflection(mm)

0

I

-50 -25 0


Direction B


Pierce Crescent & Lewis Drive

25..

500

20

40

aJ

80

100

120

140

..L25 50

50LEGEND0

Initial 22Nov2CXXJ

&-----f] 7 Dec2CXXJ

12 Jan2001

20

Documents

amerfJ - City of Quesnel · amerfJ 26 J:nua~) KX03904 ~-----,- ... Inclinometer installations ... SI-7 Pierce Crescent also an apparent but gradual systematic shift evident on the