File: 2006-1002c Date: December 2006

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Slide Name: (GP 14) SH 733 Bad Heart River Inspection Date: June 19, 2006 Inspection by: Alberta Infrastructure & Transportation and KarlEng Staff listed on Page 1 1.0 BACKGROUND For this site, the previous instrumentations were installed by MD/ID forces in the late 1990’s when secondary highway operation was under their jurisdiction. Most of previous instrumentations are not operational. 2.0 INSTRUMENTATION INTREPRETATION UPDATE Most of the instrumentation at this site, especially for the north side, are not-operational.. At the 2 slides (Slide #1 and Slide #2) on the north side, all instrumentations are not operational and were sheared off generally at 7m to 12m depths along the sideslope and mid valley slope areas. At the slide on the south side, only a few SIs (and associated piezometers) are still operational.

• At the south fringe of the slide zone, shear movements were monitored at about 17m depth. The SI was found sheared off around Sept 2004 with about 70mm cumulative movements observed over a 6 year duration since Oct 1998. Movement rate is considered slow.

• At the centre area of slide zone and at toe area of sidehill fill embankment, the installation of a new SI indicates that

- shear movement was recently (2005/2006) monitored at 12m depth. Over a 2.5 year duration since Dec 2003, a cumulative movement of 40-50mm was monitored with movement rate assessed at about 20mm/year.

- Perched groundwater can be assessed at 6m, 12m, 16m depth below ground surface.

3.0 OBSERVATIONS South Slide

• There is a possibility of a two slide system exists at this north Side of the river valley. - with an upper slide headscarp crack located at the cut section just south of the

approach down the valley. - with a lower slide headscarp crack located at bottom 1/3 height of valley slope

just south of the curve (just upgrade from the dual culvert at bottom of valley). • There is a possibility the the upper slide can be nesting onto lower slide. • It was discussed that an aerial photo review can be useful. This site maybe a potential

implementation of INSAR technology through tree cover if possible. • Tension crack is still appearing at mid-stretch between the perceived upper and lower

slide locations.

File: 2006-1002c Date: December 2006

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North Slide • There is two slides at north side of river, with upper slide close to top of valley slope and

lower slide at mid-height of valley slope. • Lower slide has substantially deteriorated within previous years (2004/2006) showing

manifestation of pavement cracking and settlement. Contortion and undulation of roadway was obvious.

• It is likely that the lower slide will coalesce with upper slide into one big slide system. • The total slide (Lower + Upper) can be about 300 m in length along the highway. • It was discussed on site that a review of aerial photo can be useful. It was also discussed

that there is a possibility to realign towards backslope. Despite deterioration of lower slide on the north side, the other slide zones of this Heart River valley have not exhibited drastic deterioration. Based on past observations, slide movement rates are assessed relatively slow. 4.0 RISK ASSESSMENT The following assessment is updated, as appropriate, from previous AIT reports. PF ( 9 ) * CF ( 3 ) = 27 Note:

• The risk assessment is provided based on a categorization of Hazard Probability Factor (PF) and Consequence Factor (CF) as provided by AIT’s RFP 2000. The details are provided in Table II at front portion of this Report.

5.0 ACTION It was discussed on site that an aerial photo review can be useful. This site maybe a potential implementation of INSAR technology through tree cover if possible. Based on past observations, slide movement rates are assessed relatively slow. Visual and instrumentation monitoring of this site should be continued. END

Site GP14 – SH 733:04 File:2006-1002 Bad Heart River Slides November 2005

Based on 1995 Aerial Photograph

Figure 1

0 800 Site Plan

SCALE (metres)

Hwy. 733:04 Bad Heart River (b) South Side

2006-1002C GP # 14b August 2006

Photo taken on June 2006

Page 1 of 5

Photo 1

Photo 3 Photo 2

Slide at south valley slope of Heart River - Looking south at crest of river valley - South edge of slide (pavement patching) close to top of river valley - Slide crack patched over - Valley slope to left of photo

Slide at south river valley slope Looking from west ditch

- Close up of south edge of slide - Closed up of south edge of slide - Roadway undulation of settlement apparent - Slide crack apparently runs from patched area (top central of photo) down to and along ditch (right of photo)

Hwy. 733:04 Bad Heart River (b) South Side

2006-1002C GP # 14b August 2006

Photo taken on June 2006

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Photo 4

Photo 5

Slide at south river valley slope - Looking north toward valley bottom and river - Southern extent of this slide possible located just before the curve - It can be possible this slide can be a nested mix of 2 slides - Tension crack was previously visible before patch and still apparent

Looking north from west ditch - Settlement and kink along alignment (just before curve)

can be indicative of north edge of this slide area

Settlement and undulation of road – possible north edge of slide

Hwy. 733:04 Bad Heart River (a) North Side

2006-1002C GP # 14a August 2006

Photo taken on June 2006

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Photo 6

Photo 7 Photo 8

North side of river: Two Slides – (a) upper slide (b) lower slide

- Upper slide - Looking south down valley from north edge of upper slide - Crack propagating from north (sideslope edge) across pavement to run toward backslope and ditch - Settlement of roadway due to slide movement is apparent - This upper slide can be nested with a lower slide located just

ahead of a curve down valley (at centre and into the photo) Upper slide Upper slide

- Looking north (up valley crest) at north edge of slide from west ditch - Looking south (down valley) at juncture area with lower slide - Slide movement obvious from undulation settlement of highway - Slide movement obvious from undulation of settlement of roadway

Cracking & slumping prorogation towards backslope and ditch area

Lower slide

Upper slide

Lower slide

Hwy. 733:04 Bad Heart River (a) North Side

2006-1002C GP # 14a August 2006

Photo taken on June 2006

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Photo 9

Photo 10 Photo 11

North side of Heart River – upper slide (another view) - Looking south (down valley) from north edge of slide - Lower slide located just before the far curve

Lower slide Juncture of upper slide and lower slide (another view)

- Tension crack and headscarp cracks along pavement - Looking south (down valley) over a stretch of 80-100m distance - Road undulation

Hwy. 733:04 Bad Heart River (a) North Side

2006-1002C GP # 14a August 2006

Photo taken on June 2006

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Photo 12

Photo 13

Lower slide - Details of pavement crack and contortion

Lower slide - Another view of pavement crack and contortion