Keremeos Rock Slide FOI

From: Pollak, Steve C TRAN:EXTo: Sirett, Steve TRAN:EXCc: Wiseman, Jeff TRAN:EX; Tekano, Murray TRAN:EX; Dowdle, Mike L TRAN:EX; Wu, Ben S TRAN:EX; Beattie,

Brent C TRAN:EX; Harbicht, Terry N TRAN:EX; Gerraghty, David E TRAN:EX; Pilkington, Ian TRAN:EX;Valentinuzzi, Joe A TRAN:EX; Elke, Wayne D TRAN:EX; Dacho, Frank H TRAN:EX; Blixrud, Rick G TRAN:EX;Evans, Michelle D TRAN:EX

Subject: April 17, 2014 Reassessment at Keremeos Slide, Hwy #3, 10 km West of KeremeosDate: Wednesday, April 23, 2014 2:36:23 PMAttachments: 8005_Keremeos_Area_Reassessment_Photos_April_17_2014.pdf

8005_Keremeos_Options_8_to_11_Sketches_Apr_23_2014.pdf8005_Keremeos_Options_8_to_11_Rockfall_Simulations_Apr_23_2014.pdf

Hi Steve

Further to our teleconference on April 15, 2014 and as requested, a re-assessment of theKeremeos slide area was performed by Rockwork Engineering using a helicopter on April 17, 2014. We offer the following updated information on rock fall history, potential rock fall sources andoptions for rock fall control. The preferred option is presented herein.

In addition to Options 1 to 7 presented in an email dated March 7, 2014 we present four additionalOptions 8, 9, 10 and 11.

Options 8 and 9 were considered in response tothe do nothing to the road suggestion at the April 15, 2014 meeting. Option 10 is presented as areduced toe excavation option limiting the length of excavation from 700 m to 200 m.

Rock Fall History:

Rock falls continue to occur at this site. The rock fall history has been updated as follows:

December 6, 2003 a 4 m3 rock fall resulted in 4 vehicles damaged January 27, 2014 a 500 m3 rock fall resulted in 2 vehicles damaged January 28, 2014 a 20 m3 rock fall on road during cleanup before berm constructed on

January 30 February 19, 2014 small number of rocks on road March 5, 2014 small number of rocks contained by temporary berm April 16, 2014 small number of rocks contained by temporary berm

The above rock fall history does not include several rock fall events that were contained on thetalus slope and did not reach the highway.

.

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PentictonHighlight

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Potential Rock Fall Sources: During the April 17, 2014 reassessment of the Keremeos slide area, potential rock fall sources wereidentified as shown on the attached photo sheets. Sources include the talus slope and the rockslope above the talus. The source area of the most recent rock fall event on April 16, 2014 isprobably near the bottom of a large 250 m3 fractured mass where there are recent signs of activitywhich have resulted in some loss of toe support. This fractured mass and various other potentialrock fall sources adjacent to and below the January 27, 2014 source area are identified on theattached photo sheets. Options for Rock Fall Control: The following options for rock fall control were developed with associated cost estimates. Options1 to 7 were previously presented on March 7. We present four additional Options 8, 9, 10 and 11.

Cost estimates do not include re-paving whichis estimated at

Option 1 Remove temporary berm, no change to slope or highway costdoes not include cost of restoring site to original configuration)

Option 2 Construct bench B on slope, no change to highway cost

Option 3 Excavate toe of slope and deepen ditch to 2 m where possible (200 m long),highway is 4 lanes cost

Option 4 Excavate toe of slope, deepen ditch to 3 m and remove one lane (200 m long),highway reduced to 3 lanes -- cost

Option 5 Excavate toe of slope, deepen ditch to 1.5 m, remove one lane (200 m long) andconstruct wall (100 m long), highway reduced to 3 lanes cos

Option 6 Excavate toe of slope, deepen ditch and construct wall without removing a lane(200 m long). There is very little room to place a wall between S6 and S8 resulting inminimal catchment width without removing a lane cost

Option 7 Excavate talus to the top of the talus slope (130 m high) by excavating about52,000 m3 to a depth of 4 m between sections S6 and S8 (100 m long), and excavate toe ofslope about 10,000 m3 between S5 and S10 (200 m long). Removal of talus to the top isestimated to cost The result is

and the total cost is estimated to be about

Option 8 No excavation, no change to lane configuration, construct 2 block high LockBlock wall (100 m long) cost only 2 m3/m catchment storage,insufficient for significant rock fall event, full impact on wall may break the wall)

Option 9 No excavation, no change to lane configuration, construct 3 block high Lock

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PentictonSticky NoteWas anything done? Why or why not?

Block wall (100 m long) cost only 3 m3/m catchment storage,insufficient for significant rock fall event, full impact on wall may break the wall)

Option 10 Toe excavation for 200 m length, no change to lane configuration, construct 3block high Lock Block wall (100 m long) cost only 3 to 6 m3/mcatchment storage, insufficient for significant rock fall event, full impact on wall may breakthe wall)

Option 11 Toe excavation, deepen ditch to 1.5 m, move out 4 lanes, build outsideretaining walls if necessary, and construct 4 block high rock fall protection wall (100 m long) cost With paving costs, the current updated estimated cost is

Also attached are sketches showing Options 8 to 11 and the results of rock fall simulations tosupport the above descriptions of Options 8, 9, 10 and 11. Simulations for Option 11 are similar toresults obtained for Option 5. Regards, S. Pollak, P. Eng.Rockwork EngineerMinistry of Transportation and InfrastructureRockwork EngineeringUnit #310 1500 Woolridge StreetCoquitlam, BCV3K 0B8CanadaOffice: 604-527-2282 (forwarded to cell)Cell:

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Photos #1: Overall view showing site areaRef# 10952 SCP April 17, 2014

3.045

Geotechnical and Materials Engineering, Rockwork Section File: 32350-33/30.263Photos Showing Proposed Work, Project No. 11404-8005

Page 1 of 7Keremeos Area, Hwy #3RFI Landmark No.: 7080, RFI Landmark Name: Lucky R Campground, RFI Offset: 2.900 to 3.045 kmLKI Segment: 2210, LKI Segment Name: Princeton to Keremeos, LKI km: 55.5 to 55.6

File: 8005_Keremeos_Area_Reassessment_Photos_April_17_2014.pptx

April 17, 2014

To Princeton To Keremeos

January 27, 2014 rock fall source area (500 m3)

Highway #3

RHRS section 137074, A slope 426 points, offset 2.619 to 3.045 km

2.619

Talus slope

Rock slope

Temporary berm at proposed wall

Potential rock fall sources include rock slope and talus slope

On slope stabilization is not considered safe or practical

Page 4 TRA-2014-00126

Photo #2: Overall view showing site areaRef# 10952 SCP April 17, 2014

3.045




April 17, 2014


2.845

Existing temporary berm 200 m long and 1.5 m high, constructed on January 30, 2014

Proposed rock fall protection wall location 100 m long and 1.5 m to 3 m high

Optimum storage capacity is 250 to 500 m3

2.9193.019

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Photo #3: View showing existing termporary bermRef# 10952 SCP April 17, 2014




April 17, 2014

Existing paved shoulder width 1.0 to 1.2 m

Temporary berm in westbound fast lane (200 m long and 1.5 m high)

3.045

2.845

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Photo #4: View showing upper site areaRef# 10952 SCP April 17, 2014




April 17, 2014

January 27, 2014 rock fall source area

Upper rock slope

Lower rock slope

Potential rock fall sources

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Photo #5: View showing upper rock slope areaRef# 10952 SCP April 17, 2014




April 17, 2014


Upper rock slope

Fractured mass 250 m3


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Photo #6: View showing potentially unstable areas in upper rock slope adjacent to source areaRef# 10952 SCP April 17, 2014




April 17, 2014


Loose blocks 1 m3 each

Fractured mass 250 m3

Probable source of April 16, 2014

rock fall contained by berm


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Photo #7: View showing large fractured massRef# 10952 SCP April 17, 2014




April 17, 2014

Photo #8: View showing large fractured massRef# 10952 SCP April 17, 2014

Fractured mass 250 m3Fractured mass 250 m3


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From: Valentinuzzi, Joe A TRAN:EXTo: Harbicht, Terry N TRAN:EX; Beattie, Brent C TRAN:EX; Kneale, Tom TRAN:EXSubject: FW: Calculate Excavation Volumes for Options 3, 4 and 5 -- 10 km west of Keremeos Jan 27, 2014 rock fall siteDate: Wednesday, March 5, 2014 10:22:45 AMAttachments: Scan_20140304.pdf

image001.png

FYI..Joe J.A.Valentinuzzi, P.Eng, Manager Highway Engineering ph(250)-828-4256 cell(250)-371-7060 email [email protected]

please consider the environment before printing this e-mail

From: Valentinuzzi, Joe A TRAN:EX Sent: Wednesday, March 5, 2014 10:20 AMTo: Elke, Wayne D TRAN:EXCc: Irvine, Grant M TRAN:EX; Ralston, Rod S TRAN:EXSubject: FW: Calculate Excavation Volumes for Options 3, 4 and 5 -- 10 km west of Keremeos Jan 27,2014 rock fall site Wayne, I thought you would be the most appropriate person to work on thesevolume calculations for Rockwork before they decide on what design they wantto go with. Talk to Rod about background on this one.

but call me any time if you have questions; You can also call StevePollack for any info may still need. Thank you.Joe J.A.Valentinuzzi, P.Eng, Manager Highway Engineering ph(250)-828-4256 cell(250)-371-7060 email [email protected]


From: Pollak, Steve C TRAN:EX Sent: Tuesday, March 4, 2014 3:49 PMTo: Valentinuzzi, Joe A TRAN:EXCc: Ralston, Rod S TRAN:EX; Dowdle, Mike L TRAN:EX; Beattie, Brent C TRAN:EXSubject: Calculate Excavation Volumes for Options 3, 4 and 5 -- 10 km west of Keremeos Jan 27, 2014rock fall site Hi Joe We would like to have proposed excavation volumes based on typical sections attached.

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Volumes are required for two lengths of highway: (refer to sections S1 to S15 previously defined)

200 m long Sections S5 to S10 700 m long Sections S1 to S15

We need excavation volumes for each of the following options (see attached sketches): Option 3 Excavate toe of slope and deepen ditch to 2 m (200 m and 700 m long)Option 4 Excavate toe of slope, deepen ditch to 3 m and remove one lane (200 m and 700 m long)Option 5 Excavate toe of slope, deepen ditch to 1.5 m, remove one lane (200 m and 700 m long)and construct wall (100 m long) Please use the following assumptions:

Excavation commences at elevation 500 m for sections S3 to S15. Excavation commences at elevation 480 to 490 m for sections S1 to S2. Excavated slope angle is 37 degrees and shoulder is 1.25:1. Wall is between sections S6 and S8.

So I need 6 separate volumes. Please call to discuss any other details

Thanks, Steve

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Highway#3,10kmwestofKeremeosrockfallsiteofJanuary27,2014Proposedoptionsforimprovedrockfallprotection,updatedMarch7,2014

Location:LKISegmentNumber:2210 RFILandmarkNumber:7080LKISegmentName:PrincetontoKeremeos RFILandmarkName:LuckyRCampgroundLKIkm:55.5to55.6 RFIOffset(km):2.900to3.045

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BenchA500mlongBenchB700mlong Lockblockdimensions:1500mmx750mmx750mmBenchC600mlong Matdimensions:3mx2.7mx0.3m

Slopeexcavationassumes37degreebackslope*200mlengthBenchB Ditchexcavationassumesshoulderat1.25:1*700mlengthBenchA,BandC *Lengthofhighway:200mbetweenS5andS10,700mbetweenS1andS15

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*Costforselectedlengthofhighway(200

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From: Elke, Wayne D TRAN:EXTo: Sirett, Steve TRAN:EXSubject: Accepted: H3 Rock Slide - Conceptual Design Review

Page 40 TRA-2014-00126

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From: Elke, Wayne D TRAN:EXTo: Pollak, Steve C TRAN:EXCc: Beattie, Brent C TRAN:EXSubject: Hwy 3 - Keremeos Rock Fall Option 3Date: Wednesday, March 12, 2014 2:31:00 PMAttachments: Cross Sections Option 3.pdf

Wayne ElkeConsulting Services ManagerHighway Engineering, Southern Interior Region231 - 447 Columbia StreetKamloops, B.C. V2C 2T3Phone: 250-828-4716CellFax: 250-828-4274

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From: Elke, Wayne D TRAN:EXTo: Pollak, Steve C TRAN:EXCc: Beattie, Brent C TRAN:EXSubject: Hwy 3 - Keremeos Rock Fall Option 5Date: Wednesday, March 12, 2014 2:31:00 PMAttachments: Cross Sections Option 5.pdf

Wayne ElkeConsulting Services ManagerHighway Engineering, Southern Interior Region231 - 447 Columbia StreetKamloops, B.C. V2C 2T3Phone: 250-828-4716Cell:Fax: 250-828-4274

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From: Elke, Wayne D TRAN:EXTo: Pollak, Steve C TRAN:EXCc: Beattie, Brent C TRAN:EX; Valentinuzzi, Joe A TRAN:EX; Sirett, Steve TRAN:EXSubject: Hwy 3 - Keremeos Rock FallDate: Monday, March 24, 2014 3:00:00 PMAttachments: Cross Sections Option 3 WITH RETAINING WALL.pdf

Steve Attached are cross sections showing the lock block wall as per option 5 but with a four lanehighway template. I shifted the highway towards the river to gain the distance needed for theother lane. The cross section shows that I can build the fourth lane by building a three lock blockhigh wall (from station 7+00 to station 9+60) or construct the fill slope with the excavation materialfrom the project. To build the fill slope requires about 20,000 m3 of material and the totalexcavation from the project is about 85,000 m3. If you look at the section I may be able to reducethe excavation at some of the stations. I will discuss with more detail at the meeting tomorrow. Wayne ElkeConsulting Services ManagerHighway Engineering, Southern Interior Region231 - 447 Columbia StreetKamloops, B.C. V2C 2T3Phone: 250-828-4716Cell:Fax: 250-828-4274

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From: Pollak, Steve C TRAN:EXTo: Sirett, Steve TRAN:EXCc: Swales, Dave L TRAN:EX; Dowdle, Mike L TRAN:EX; Seelig, Peter TRAN:EX; Cossenas, Aristo TRAN:EX; Wu,

Ben S TRAN:EX; Beattie, Brent C TRAN:EX; Harbicht, Terry N TRAN:EXSubject: Jan 30 Assessment of Keremeos Slide, Hwy #3Date: Thursday, January 30, 2014 1:56:40 PM

Hi Steve

As discussed with you on site, I would like to summarize results of our helicopter assessment of therock fall site and future plans as follows.

An aerial assessment was done today between about 11 am and 12 pm when cloud cover lifted. Theredoes not appear to be any major residual stability problem in the area of the Jan 27 rock fall. Thisassessment confirms the photographic analysis that was carried out previously. There has been no rockfall activity since Jan 28.

Given the latest assessment results and lack of any visible rock falls, there is no reason to delayopening the highway to traffic. It may be prudent to continue with the proposed risk reductionmeasures as planned, including temporary berm, two lanes closed, spotter and flag people. As coldtemperatures and inactive slope continue, a reduction in the number of on site personnel may beconsidered starting tomorrow at the discretion of the District.

The previously established traffic shutdown criteria appear to be reasonable:

- basketball size triggers half hour closure- 2 m3 on the pavement triggers closure and re-assessment

Re-staffing the site is reasonable should warmer temperatures be expected that could trigger moreactivity. After a day or two of above freezing weather and noticeable thawing of the slope without rockfall activity, re-opening to 4 lanes should be considered.

Steve

> On Jan 29, 2014, at 6:25 PM, "Pollak, Steve C TRAN:EX" wrote:>> I just got an update from Steve. The road will remain closed tonight. Work at highway level hasstopped and will continue tomorrow. This is just a precaution for worker safety, no rock fall activity hasoccurred.>> Steve>>> On Jan 29, 2014, at 4:44 PM, "Pollak, Steve C TRAN:EX" wrote:>>>> Hi Steve>>>> Further to Brent Beattie's initial assessment on January 28 of the January 27, 2014 rock fall site,Rockwork Engineering performed additional assessment work using images of the site taken before andafter the event. The site is located about 9 km west of Keremeos (RFI landmark 7090, Lucky RCampground, offset 2.900 to 3.045 km and LKI km 55.5 to 55.6). My understanding is that twovehicles were damaged in the event consisting of up to about 500 m3 on the pavement, but no seriousinjuries resulted. A second rockfall of about 20 m3 occurred on January 28 around 2 pm after cleanupoperations had started. There has been no more rock fall activity since January 28.>>>> Photographic analysis suggests that the rock fall source area has generally cleaned itself out andappears to be in a better stability condition than before the event. While some residual rock fall activitymay result in the future, it is generally expected to consist of isolated low volume events with a similarlikelihood of occurring as from surrounding areas.

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>>>> To confirm our photographic analysis, on January 29 we attempted to perform an aerial assessmentof the rock fall source area, but the site was not accessible by helicopter due to poor weatherconditions. A limited highway level assessment was proposed today using binoculars, but low cloudprevented that. A follow-up aerial attempt is scheduled for tomorrow morning with a forecastedimprovement in weather.>>>> Given the generally difficult site access and slope conditions, weather and potential worker safetyconcerns, an on-slope stabilization attempt is not recommended and not considered practical ornecessary at this time.>>>> The highway has remained closed since January 27 with limited additional rock fall activity. On thebasis of engineering assessment results, it was determined that the rock fall site has reached a degreeof stability that would allow interim re-opening of the highway to two lanes this evening with thefollowing risk reduction measures in place:>>>> - Westbound two lanes remain closed>> - Construct a temporary rock fall protection berm in the WB fast lane, 150 to 200 m long and 1 to 2m high or as can reasonably be achieved using available material nearby.>> - Spotter person with radio and air horn>> - Flagpersons with the ability to close the highway if spotter sees rock fall activity>>>> There is a slight possibility that tomorrow's scheduled aerial assessment may require changes to theabove measures. If additional rock falls occur in the meantime overnight, it may be wise to close thehighway again until further assessment is done.>>>> As winter weather conditions consisting of cold temperatures and snow now exist at the site, thereis a possibility that the source area stability has increased. The stability condition may change over thenext few days as temperatures fluctuate and freeze-thaw may occur. Within 1 to 2 days it may bepossible to remove the berm and fully re-open the highway to 4 lanes, if for example warmertemperatures do not result in significant additional rock fall activity.>>>> Any previously established safe work procedures are not superseded by any of the above.>>>> Steve

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From: Elke, Wayne D TRAN:EXTo: Pollak, Steve C TRAN:EXCc: Valentinuzzi, Joe A TRAN:EX; Beattie, Brent C TRAN:EXSubject: RE: Calculate Excavation Volumes for Options 3, 4 and 5 -- 10 km west of Keremeos Jan 27, 2014 rock fall siteDate: Wednesday, March 12, 2014 11:36:00 AMAttachments: BasePlan with sections Acad 2010.dwg

BasePlan with sections lines.pdfXS - l1p1-design option3.dwgXS - l1p1-design option3.dxfXS - l1p1-design option5.dwgXS - l1p1-design option5.dxfimage001.png

Steve I had to create an alignment in order to calculate volumes as per pdf attached. Section S1 = station 4+90Section S5 = station 7+80Section S10 = station 9+80Section S15 = station 11+90 Option 3 Station 7+80 to Station 9+80 excavation = 62,614 m3Station 4+90 to Station 11+90 excavation = 159,072 m3 Option 4 Station 7+80 to Station 9+80 excavation = 55,021 m3Station 4+90 to Station 11+90 excavation = 131,917 m3 Option 5 Station 7+80 to Station 9+80 excavation = 20,230 m3Station 4+90 to Station 11+90 excavation = 50,479 m3 I attached the cross section for option 3 and 5 Wayne ElkeConsulting Services ManagerHighway Engineering, Southern Interior Region231 - 447 Columbia StreetKamloops, B.C. V2C 2T3Phone: 250-828-4716Cell:Fax: 250-828-4274

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From: Pollak, Steve C TRAN:EX Sent: Friday, March 7, 2014 8:44 AMTo: Elke, Wayne D TRAN:EXCc: Valentinuzzi, Joe A TRAN:EX; Dowdle, Mike L TRAN:EX; Beattie, Brent C TRAN:EXSubject: RE: Calculate Excavation Volumes for Options 3, 4 and 5 -- 10 km west of Keremeos Jan 27,2014 rock fall site Hi Wayne Can I have an ETA on the volume calculations? Thanks, Steve From: Valentinuzzi, Joe A TRAN:EX Sent: Wednesday, March 5, 2014 10:22 AMTo: Pollak, Steve C TRAN:EXSubject: FW: Calculate Excavation Volumes for Options 3, 4 and 5 -- 10 km west of Keremeos Jan 27,2014 rock fall site Steve, fyi..Joe J.A.Valentinuzzi, P.Eng, Manager Highway Engineering ph(250)-828-4256 cell(250)-371-7060 email [email protected]


From: Valentinuzzi, Joe A TRAN:EX Sent: Wednesday, March 5, 2014 10:20 AMTo: Elke, Wayne D TRAN:EXCc: Irvine, Grant M TRAN:EX; Ralston, Rod S TRAN:EXSubject: FW: Calculate Excavation Volumes for Options 3, 4 and 5 -- 10 km west of Keremeos Jan 27,2014 rock fall site Wayne, I thought you would be the most appropriate person to work on thesevolume calculations for Rockwork before they decide on what design they wantto go with. Talk to Rod about background on this one.

but call me any time if you have questions; You can also call Steve

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Pollack for any info you may still need. Thank you.Joe J.A.Valentinuzzi, P.Eng, Manager Highway Engineering ph(250)-828-4256 cell(250)-371-7060 email [email protected]


From: Pollak, Steve C TRAN:EX Sent: Tuesday, March 4, 2014 3:49 PMTo: Valentinuzzi, Joe A TRAN:EXCc: Ralston, Rod S TRAN:EX; Dowdle, Mike L TRAN:EX; Beattie, Brent C TRAN:EXSubject: Calculate Excavation Volumes for Options 3, 4 and 5 -- 10 km west of Keremeos Jan 27, 2014rock fall site Hi Joe We would like to have proposed excavation volumes based on typical sections attached. Volumes are required for two lengths of highway: (refer to sections S1 to S15 previously defined)

200 m long Sections S5 to S10 700 m long Sections S1 to S15

We need excavation volumes for each of the following options (see attached sketches): Option 3 Excavate toe of slope and deepen ditch to 2 m (200 m and 700 m long)Option 4 Excavate toe of slope, deepen ditch to 3 m and remove one lane (200 m and 700 m long)Option 5 Excavate toe of slope, deepen ditch to 1.5 m, remove one lane (200 m and 700 m long)and construct wall (100 m long) Please use the following assumptions:

Excavation commences at elevation 500 m for sections S3 to S15. Excavation commences at elevation 480 to 490 m for sections S1 to S2. Excavated slope angle is 37 degrees and shoulder is 1.25:1. Wall is between sections S6 and S8.

So I need 6 separate volumes. Please call to discuss any other details

Thanks, Steve

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From: Pollak, Steve C TRAN:EXTo: Sirett, Steve TRAN:EXCc: Wiseman, Jeff TRAN:EX; Dowdle, Mike L TRAN:EX; Wu, Ben S TRAN:EX; Beattie, Brent C TRAN:EX; Harbicht,

Terry N TRAN:EX; Gerraghty, David E TRAN:EX; Pilkington, Ian TRAN:EXSubject: RE: H3 Rock Slide - Report -- 10 km west of Keremeos at rock fall site of Jan 27, 2014Date: Friday, March 14, 2014 3:11:52 PM

Hi Steve We can quickly respond with some information for your report. Rockfall Hazard: The site is located within RHRS section number 137074 which is from 2.619 and3.045 km east of the Lucky R Campground (landmark #7080). The centreline of the January 27,2014 rock fall is located within the RHRS section at 3.002 km. This RHRS section is rated an Ahazard which has a high potential for rock fall, with a hazard score of 426 points and a risk score of126 points. It is ranked among the top 10% of slopes identified in the Province and is a goodcandidate for rock fall hazard reduction. Rockfall History: We have had no rock fall records from the maintenance contractor for this area. However, the maintenance contractor may have more information about any unrecorded rock fallsthat do not meet recording criteria. At this site, the historical activity has consisted of lowfrequency, high volume rock fall events which have had high consequences. There have been atotal of 6 vehicles damaged here, which is a relatively high number for historically few rock fallevents. On December 6, 2003 a 4 m3 rock fall resulted 4 vehicles damaged. On January 27, 2014 a500 m3 rock fall resulted in 2 vehicles damaged. From January 28 to March 12 a total of 6 morerock falls were either on the pavement or contained behind a temporary berm on the pavement. Therefore a total of 8 recorded rock fall events have occurred with potentially seriousconsequences. Increased Rockfall Activity: As a result of the January 27, 2014 event there has been an increase inrock fall activity in this area, and rock falls are continuing to occur. Not all the rock fall debrisreached the highway, and some of the remaining debris may continue to ravel down to road level.

Future Risk: Increased rock fall frequency increases the risk of more vehicle accidents. Rock fallsare originating from well beyond the highway right-of-way at high elevation, about 400 to 500 mabove the highway.

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Funding for Proposed Remediation: Normally Rockwork Engineering funds rock slope stabilizationin high hazard areas. However, the remedial solution for this site involves some slopereconstruction that is typically not a function that is funded or carried out under the ProvincialRockwork Program. Our funding is dedicated to on-slope stabilization work such as scaling, bolting,blasting, slope mesh etc. We also fund barriers and catch fences for rock fall control. RockworkEngineering is willing to fund the construction and material costs of the proposed rock fallprotection wall, because this is a fairly common remedial measure that we have used and fundedin the past. Any slope excavation or lane removal work is outside of the normal mandate forRockwork, so funding for this work would have to come from another source. Funding for guardrailand drainage work would also need to be obtained elsewhere. Regards, S. Pollak, P. Eng.Rockwork EngineerMinistry of Transportation and InfrastructureRockwork EngineeringUnit #310 1500 Woolridge StreetCoquitlam, BCV3K 0B8CanadaOffice: 604-527-2282 (forwarded to cell)Cell:

From: Sirett, Steve TRAN:EX Sent: Friday, March 14, 2014 8:38 AMTo: Pollak, Steve C TRAN:EXCc: Wiseman, Jeff TRAN:EXSubject: H3 Rock Slide - Report Hi Steve Got your message, figured I would just send a quick email as you may be off today. I am going to need to put together a brief report on the slide and option to justify the funding. Iwas hoping you could provide me some information on a few items:

Rank of this area on the rock fall hazard(I know you had said this was a high ranked area) I will need to explain what has changed here since last spring that warrants us to now

undertake these improvementso Data on previous rock fall in this location?? If available. I will also talk to our MCo Why the site is now unstable enough to warrant a potential wall and reduction of a

lane?

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o Risk going forward if we do nothingo Any additional pertinent info??

I have enough information on the different options to put those into the report but if you couldprovide technical background on the above topics and anything else you think may be beneficial tobe in there. I will be sure to have you review the report before sending it up the ranks. Thanks and have a good weekend! Steve SirettDistrict Program Manager - Okanagan ShuswapMinistry of Transportation & Infrastructure#300 1358 St. Paul StreetKelowna BCV1Y 2E1

Office: 250-712-3666Cell:

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From: Pollak, Steve C TRAN:EXTo: Elke, Wayne D TRAN:EXCc: Dowdle, Mike L TRAN:EX; Valentinuzzi, Joe A TRAN:EX; Beattie, Brent C TRAN:EXSubject: RE: Hwy 3 - Keremeos Rock Fall Option 5Date: Thursday, March 13, 2014 3:01:17 PM

Hi Wayne We need to make some adjustments to reflect constructability. Between STA 8+40 to 9+10 the cutline goes too high when we use a 37 degree cut angle. This is a problem for construction and longterm stability because the upper slope in this area will be disturbed too much. So for STA 8+40 to STA 9+10 we need to increase the cut angle to 38 degrees. Please update sections and excavation volumes accordingly. Thanks, Steve From: Elke, Wayne D TRAN:EX Sent: Thursday, March 13, 2014 1:33 PMTo: Pollak, Steve C TRAN:EXCc: Dowdle, Mike L TRAN:EX; Valentinuzzi, Joe A TRAN:EX; Beattie, Brent C TRAN:EXSubject: RE: Hwy 3 - Keremeos Rock Fall Option 5 Steve File showing the wall going to station 9+30 Wayne ElkeConsulting Services ManagerHighway Engineering, Southern Interior Region231 - 447 Columbia StreetKamloops, B.C. V2C 2T3Phone: 250-828-4716CellFax: 250-828-4274 From: Pollak, Steve C TRAN:EX Sent: Thursday, March 13, 2014 1:20 PMTo: Elke, Wayne D TRAN:EXCc: Dowdle, Mike L TRAN:EX; Valentinuzzi, Joe A TRAN:EX; Beattie, Brent C TRAN:EXSubject: RE: Hwy 3 - Keremeos Rock Fall Option 5

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The wall stops at STA 8+90 for some reason. Can it be shown to go all the way to 9+30 ? Thanks, Steve From: Elke, Wayne D TRAN:EX Sent: Thursday, March 13, 2014 1:13 PMTo: Pollak, Steve C TRAN:EXCc: Dowdle, Mike L TRAN:EX; Valentinuzzi, Joe A TRAN:EX; Beattie, Brent C TRAN:EXSubject: RE: Hwy 3 - Keremeos Rock Fall Option 5 Steve Attached are the files with the changes. Wayne ElkeConsulting Services ManagerHighway Engineering, Southern Interior Region231 - 447 Columbia StreetKamloops, B.C. V2C 2T3Phone: 250-828-4716Cell:Fax: 250-828-4274 From: Pollak, Steve C TRAN:EX Sent: Thursday, March 13, 2014 12:19 PMTo: Elke, Wayne D TRAN:EXCc: Dowdle, Mike L TRAN:EX; Valentinuzzi, Joe A TRAN:EX; Beattie, Brent C TRAN:EXSubject: RE: Hwy 3 - Keremeos Rock Fall Option 5 Hi Wayne The wall goes between STA 8+30 and 9+30 Wall is missing at STA 8+80 Change the title of the plan view, remove Landslide and replace with Rockfall. Please send me updated plan and sections. Thanks, Steve

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From: Elke, Wayne D TRAN:EXTo: Pollak, Steve C TRAN:EX; Beattie, Brent C TRAN:EX; Sirett, Steve TRAN:EX; Valentinuzzi, Joe A TRAN:EXSubject: RE: Hwy 3 - Keremeos Rock FallDate: Monday, April 14, 2014 1:02:00 PM

Everyone The pdfs are in the following folder for the three and four lane options. Estimate for the optionshould be in the folder at the end of the day.

The excavation for the three lane option is about 76,500 m3 but that is using mostly a 5m wideditch 1.5m deep. The quantity could be less if the ditch width is reduced at some of the stationsbut that will be a geotechnical call. The excavation for the four lane option is about 78,000 m3 but that is using a average 3m wideditch 2m deep. Embankment needed could be up to 40,000 m3 depending on R/W and pole lines.If a wall is required because of R/W and hydro lines the embankment needed will be less and therewould be a cost for the wall. Wayne ElkeConsulting Services ManagerHighway Engineering, Southern Interior Region231 - 447 Columbia StreetKamloops, B.C. V2C 2T3Phone: 250-828-4716Cell:Fax: 250-828-4274

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From: Blixrud, Rick G TRAN:EXTo: Valentinuzzi, Joe A TRAN:EX; Dacho, Frank H TRAN:EXCc: Evans, Michelle D TRAN:EX; Ralston, Rod S TRAN:EX; Elke, Wayne D TRAN:EX; Irvine, Grant M TRAN:EX;

Sirett, Steve TRAN:EXSubject: RE: Hwy 3 RockfallDate: Wednesday, March 26, 2014 4:13:29 PMAttachments: image001.png

As discussed, Joe, please carry on and we will seek emergency response or other funds to cover thecosts....Rick Thanks,Rick Blixrud,Deputy Regional Director Southern Interior Region, Ministry of Transportation and Infrastructure 342 - 447 Columbia Street, Kamloops (250) 828-4843 (250) 828-4204 e-mail: [email protected] From: Valentinuzzi, Joe A TRAN:EX Sent: Wednesday, March 26, 2014 3:54 PMTo: Blixrud, Rick G TRAN:EX; Dacho, Frank H TRAN:EXCc: Evans, Michelle D TRAN:EX; Ralston, Rod S TRAN:EX; Elke, Wayne D TRAN:EX; Irvine, Grant MTRAN:EX; Sirett, Steve TRAN:EXSubject: Hwy 3 Rockfall FYI, we are in the process of designing remedial works for the project andthis will require a site ground survey. We have contracted out the survey workthrough our existing As-And-When contract with Focus Corp. This project ispresently unfunded and therefore we will risk manage the survey costs untilfunding can be found sometime in the near futureJoe J.A.Valentinuzzi, P.Eng, Manager Highway Engineering ph(250)-828-4256 cell(250)-371-7060 email [email protected]


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From: Harbicht, Terry N TRAN:EXTo: Pollak, Steve C TRAN:EX; Swales, Dave L TRAN:EXCc: Tekano, Murray TRAN:EX; Beattie, Brent C TRAN:EX; Gerraghty, David E TRAN:EX; Dowdle, Mike L TRAN:EX;

Wu, Ben S TRAN:EX; Sirett, Steve TRAN:EX; Wiseman, Jeff TRAN:EX; Dacho, Frank H TRAN:EX; Blixrud, Rick GTRAN:EX; Evans, Michelle D TRAN:EX; Valentinuzzi, Joe A TRAN:EX

Subject: RE: Revised -- Highway #3, Keremeos Slide, 10 km West of Keremeos of January 27, 2014, Project 11404-8005Date: Thursday, February 20, 2014 8:40:00 AMImportance: High

I was on site yesterday afternoon with Dave Swales on my way back to Kamloops from a rockfallinspection at Vaseaux Lake.

While we were on siteyesterday, we observed several large boulders falling and bouncing around the top of the talusfan. The boulders were probably in the 1 to 1.5m diameter range, size wise, as we could both seeand hear them at road level. They did not make it down to the highway, and there were alsoseveral large dust clouds flying around up on the rock faces above the talus slope, indicating fallthat we were not seeing

Terry N. Harbicht, P. EngManager, Geotechnical and Materials EngineeringSouthern Interior RegionMinistry of Transportation and Infrastructure447 Columbia Street, Kamloops, BC, V2C 2T3Telephone: Office (250) 371-3956, Fax (250) 828-4083, Cell (250) 319-0015email: [email protected]: Pollak, Steve C TRAN:EX Sent: Tuesday, February 18, 2014 10:54 AMTo: Swales, Dave L TRAN:EXCc: Tekano, Murray TRAN:EX; Beattie, Brent C TRAN:EX; Harbicht, Terry N TRAN:EX; Gerraghty, DavidE TRAN:EX; Dowdle, Mike L TRAN:EX; Wu, Ben S TRAN:EX; Sirett, Steve TRAN:EX; Wiseman, JeffTRAN:EX; Dacho, Frank H TRAN:EX; Blixrud, Rick G TRAN:EX; Evans, Michelle D TRAN:EX; Valentinuzzi,Joe A TRAN:EXSubject: Revised -- Highway #3, Keremeos Slide, 10 km West of Keremeos of January 27, 2014,Project 11404-8005 Everyone, I made a mistake on the proposed bench lengths, my calibration factor was out. Revised benchlengths, volumes and cost estimates are as follows:

Bench A 500 m long, volume 15,000 m3, cost

Bench B 700 m long, volume 21,000 m3, cost

Bench C 600 m long, volume 18,000 m3, cost

Please see attached revised sketch and photo sheets. Sorry about that.

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Thanks, Steve From: Pollak, Steve C TRAN:EX Sent: Monday, February 17, 2014 7:15 PMTo: Swales, Dave L TRAN:EXCc: Tekano, Murray TRAN:EX; Beattie, Brent C TRAN:EX; Harbicht, Terry N TRAN:EX; Gerraghty, DavidE TRAN:EX; Dowdle, Mike L TRAN:EX; Wu, Ben S TRAN:EX; Sirett, Steve TRAN:EX; Wiseman, JeffTRAN:EXSubject: Highway #3, Keremeos Slide, 10 km West of Keremeos of January 27, 2014, Project 11404-8005 File: 32350-33/30.263 Hi Dave As requested, we have reviewed all of the available information and offer the following assessmentof the stability of the site following a rock fall that occurred on January 27, 2014. Initialassessments were performed by Southern Interior Regional Geotech on January 28 and byRockwork Engineering on January 29. Analysis of recent photos was also done. While follow-upassessments may be made at a later date, at this time further on-site assessment is not consideredto be beneficial. Initial Rock Fall and Subsequent Activity: The January 27, 2014 event resulted in full closure of thehighway and subsequent re-opening to two lanes with spotters on January 30 followingconstruction of a temporary berm in the westbound fast lane. Two additional rock falls haveoccurred after the initial rock fall, resulting in two brief highway closures to permit cleanup. Anumber of other rock falls occurred that were contained behind the berm or did not affect thehighway. While there may be indications of a gradual reduction in rock fall activity since the initialJanuary 27 event, the site remains more active in general now than it has in the last 10 years. Itmay be too early to say whether the rock fall activity has now reduced to a normal level. Location: The site is located along Highway #3 between Princeton and Keremeos by the LKI and RFIas follows: LKI Segment 2210LKI Segment Name: Princeton to KeremeosLKI km 55.5 to 55.6 RFI Landmark No. 7080RFI Landmark Name: Lucky R CampgroundRFI offset: 2.900 to 3.045 km

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Rockfall Accident History: Historically a rock fall occurred on December 6, 2003 consisting of 4 m3on the highway and resulting in damage to four vehicles. We have had no other rock falls reportedfor this site between 2003 and 2013. Rock falls in 2014 have occurred on January 27, February 12and February 14. The January 27 event consisted of 500 m3 on the highway and resulted indamage to two vehicles. The remaining events occurred with a temporary berm in place on thewestbound fast lane and did not result in accidents. Other on-slope activity was observed to becontained on the slope or behind the berm. Rockfall Hazard Rating System (RHRS): The site is identified as section# 137074 in RHRS with apreliminary A rating a detailed rating numerical score of 426 points. This score indicates thissection of slope has a high rock fall hazard on a Provincial basis. Weather Conditions Affecting Rockfalls: The weather at the time of the initial rock fall event onJanuary 27 was generally dry with temperatures fluctuating around freezing. A small amount ofmoisture visible near the top of the source area had dried by the next day. Since the initial event,temperatures dropped below freezing and snow precipitation occurred. No additional rock fallactivity occurred when the slope was frozen, until temperatures rose again to around freezing onFebruary 12 and again on February 14. It appears that weather currently may be a factor in therock fall frequency at this site. It is possible that more activity may occur as temperatures continueto fluctuate and/or rainfall occurs. Assessment of Rock Fall Source Area: There are short term and long term considerations inassessment of the rock fall source area. In the short term, rock falls are expected to consist ofsmall volume events which may continue to affect the highway, mainly depending on the sourceheight. In the long term, rock falls may be larger volume and are more likely to affect the highway. Rock Fall Source Stabilization: Stabilization of the rock face in the rock fall source area is notconsidered a viable or safe option. Access to the site would require a large and costly stabilizationeffort above the source area, which would have to commence over 500 m above highway level. There is a risk that scaling may be ineffective and may result in more stability problems. Scalingprobably would not completely eliminate the rock fall problem and is not recommended, as othermore expensive measures would likely be required in addition to scaling. Difficult access and loosematerial on the slope could make worker safety an issue.

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PentictonHighlight

PentictonHighlight

PentictonHighlight

The following volumes and cost estimates are provided:

Bench A 300 m long, volume 9000 m3, cost

Bench B 400 m long, volume 12000 m3, cost

Bench C 350 m long, volume 10500 m3, cost

Regards, S. Pollak, P. Eng.Rockwork EngineerMinistry of Transportation and InfrastructureRockwork EngineeringUnit #310 1500 Woolridge StreetCoquitlam, BCV3K 0B8CanadaOffice: 604-527-2282 (forwarded to cell)Cell:

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Photo #1: Overall view showing site areaRef# 10920 SCP January 30, 2014

3.045



File: 8005_Keremeos_Area_Proposed_Work_Photos_February_18_2014.pptx

February 18, 2014

To Princeton

To Keremeos


Highway #3

Proposed bench option A, B or C


2.619

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Photo #2: Oblique view showing site areaRef# 10920 SCP January 30, 2014


Looking eastTemporary berm

3.045


February 18, 2014

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Photo #3: View of rock fall source areaRef# 10920 SCP January 30, 2014



February 18, 2014

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Photo #4: View showing rock fall debris on highwayRef# 10920 SCP January 29, 2014

Rock fall debris January 27, 2014 event

Looking west


February 18, 2014

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Photo #5: View showing temporary berm areaRef# 10920 SCP January 30, 2014

Temporary berm

3.045

Temporary berm constructed on January 30, 2014File: 8005_Keremeos_Area_Proposed_Work_Photos_February_18_2014.pptx

February 18, 2014

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Photo #6: View showing locations of proposed bench option A, B and CRef# 10920 SCP January 30, 2014

Bench A 500 m long Bench B 700 m long Bench C 600 m long

3.0452.619

Revised February 18, 2014File: 8005_Keremeos_Area_Proposed_Work_Photos_February_18_2014.pptx

February 18, 2014

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Keremeos Rock Slide FOI

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