2007 Year Review File: c Date: December Slide Location

Transcription

1 2007 YEAR REVIEW OF GEOHAZARD SITES TABLE 1: LISTING OF SITES AND RISK ASSESSMENT (2007) Slide Site Name 2007 Active Inactive Site GP1 Hwy 40:42 Wapiti Hill (5 km S. of Wapiti River Bridge) 11 * 4 44 GP2 Hwy 40:38 Kakwa River (20 km S. of Kakwa River) 3 * 2 6 GP3 Hwy 40:38 Cutbank River (south) (a)a (b) (a) 1996 Slide & Roseham Creek (b) Tension Crack + Creek Valley (highway slideslope) Slope 11 * 5 55 GP4 a) Hwy 49:06 Burnt River Bridge (West Approach) 13 * 6 78 GP4 b) Hwy 49:06 Burnt River Bridge (East Headslope) 4 * 5 20 Hwy 49:06 Burnt River Bridge (West Headslope) 4 * 5 20 GP5 Hwy 40:40 Cutbank River (North) 7 * 6 42 GP6 a) Hwy 40:36 Sheep Creek - RR Track - Backslope 1 * 4 4 GP6 b) Hwy 40:36 Sheep Creek - RR Track - Embankment 8 * 6 48 GP7 Hwy 40:36 Wanyandie Road 15 * GP8 a) Hwy 40:36 Road Surface Slumping (N. of McIntyre Mine) (Mine Tailing Pond) 6 * 5 30 GP8 b) Hwy 40:36 Rock Bluff Backslope (S. of McIntyre Mine) 5 * 3 15 GP9 Hwy 40:32 Muskeg River (Lone Teepee Creek) (E of SH 734:02) 4 * 2 8 GP10 * Hwy 43:06 S. of Sturgeon Lake (previously H34) 4 * 2 8 GP12 a) Hwy 49:04 Ksituan River West Slide 2 * 4 8 Phone: Fax:

2 Slide Site Name 2007 Active Inactive Site GP12 b) Hwy 49:04 Ksituan River East Slide 2 * 3 6 GP13 SH 722:02 Red Willow River (SW of Beaverlodge) 5 * 3 15 GP14 SH 733:04 Bad Heart River - South Slide 9 * 4 36 GP15 a) SH 727:02 Rat / Howard Creek 11 * 5 55 GP15 b) SH 727:02 Ksituan River 12 * 5 60 GP16 W. of Jct. Hwy 40 at Wapiti River Bridge (a SH 666:02 (a) - major slide 9 * 6 54 b) (b) - minor slide 11*6 66 GP17 Hwy 40:34 Grande Cache Lake 5 * 2 10 GP18 Hwy 49:12 Sturgeon Creek 10* 4 40 GP19 SH 677:02 W. of Woking and E. of SH 731:02 5 * 2 10 GP20 Hwy 40:36 N. of Grand Cache - Backsloping of Climbing Lane 6 * 2 12 GP21 SH 719 Henderson Creek N. of Hwy * 2 22 GP22 SH 736 Little Puskwaskau River 11 * 3 33 GP23 Hwy 43:08 Waskahigan River - NBL (Climbing Lane) 2 * 2 4 GP24 SH 725 Hamelin Creek Slide 9 * 4 36 GP25 Hwy 40:36 Mudslide at McIntyre Mine Access 5 * 2 10 GP26 Hwy 40:34 Ditch Erosion S. of Grande Cache N / A N / A GP27 Hwy 40:34 Ditch Erosion N. of Grande Cache N / A N / A GP28 Hwy 43:14 Two Creeks 9 * 5 45 Phone: Fax:

3 Slide Site 2007 Inactive Name Active Site GP29 Hwy 2:70 Saddle (Burnt) River at Rge Road * 7 77 GP30 a) Hwy 43:12 Iosegun River West Backslope (Catchwater Ditch) Slide 9 * 4 36 Hwy GP31 740:02 Shaftsbury Ferry (South) Slide 20 * GP32 Hwy 40:34 S-Curve: Old Road Footprint Slide 5 * 2 10 GP33 Hwy 40:36 (@ km 39.4) Southview (culvert) Slide (43 km S. of Kakwa R. Bridge) 8 * 3 24 GP34 Hwy 40:38 (@ km 20.6) High Fill Culvert Slide (2.9 km S. of Kakwa R. Bridge) 8 * 4 32 Bad Heart River SH 733:04 GP35 - North Slide 11*4 44 GP36 Hwy 40:36 Rock Fall 9 * sites (21 sites incl. *) Note: Refer to attachment (Table 2) for explanation * Site inspected for 2006 year but is to be categorized as INACTIVE for future years Phone: Fax:

4 TABLE 2 RISK ASSESSMENT EXPLANATION (Extracted from Alberta Transportation s RFP2000) The risk level will be determined by the following equation: = Probability Factor * Consequence Factor where the Probability Factor (PF) is ranked on a scale of 1 to 20 as follows: 1 Inactive, very low probability of slide occurrence 3 Inactive, low probability of remobilization 5 Inactive, moderate probability of remobilization, uncertainty level moderate, or active but very slow rate of movement or indeterminate movement pattern 7 Inactive, high probability of remobilization or additional hazards, uncertainty level high, or active with perceptible movement rate and defined zone(s) of movement 9 Active with moderate, steady, or decreasing, rate of ongoing movement 11 Active with moderate but increasing rate of movement 13 Active with high rate of movement, steady or increasing 15 Active with high rate of movement with additional hazards 20 Catastrophic slide is occurring and the Consequence Factor () is ranked on a scale of 1 to 10 as follows: 1 Shallow cut slope where slide may spill into ditches or fills, where slide does not impact pavement, minor consequence of failure, no immediate impact to driver safety, maintenance issue. 2 Moderate fills and cuts, not including bridge approach fill or headslopes, loss of portion of the roadway or slide onto road possible, small volume. Shallow fills where private land, water bodies or structures may be impacted. Slides affecting use of roadways and safety of motorists, but not requiring closure of the roadway. Potential rock fall hazard sites. 4 Fills and cuts associated with bridges, intersectional treatments, culverts and other structures, high fills, deep cuts, historic rock fall hazards areas. Sites where partial closure of the road or significant detours would be a direct and unavoidable result of a slide occurrence. 5 Phone: Fax:

5 6 Sites where closure of the road would be a direct and unavoidable result of a slide occurrence. 10 Sites where the safety of public and significant loss of infrastructure facilities or privately owned structures will occurs if a slide occurs. Sites where rapid mobilization of largescale slide is possible. Based on this approach, the highest risk level would be 200 while the lowest would be a value of 1. The terms small, moderate, shallow, etc. are subjective and are not defined herein. The purpose of assigning a level of risk to a particular site is to aid the Department in determining priorities using a rational (if subjective) approach. The Consultant is encouraged to interpolate, develop and refine this rating scheme for future discussion and revision. Please note that the Department will review all ratings and may request clarification of the Consultant s ratings. In addition, the Department has several internal interests and review processes that will be used to prioritize sites across the province, with the aid of Consultants assessments. 6 Phone: Fax: