APPENDIX A COST ESTIMATE DETAILS

Municipal District of Bighorn No. 8, Harvie Heights Creek May 25, 2015

Preliminary Debris-Flood and Debris-Flow Mitigation Design – FINAL Project No.: 1286006

HarvieHeights_Mitigation_Report_Final

BGC ENGINEERING INC.

APPENDIX A

COST ESTIMATE DETAILS

Appendix A May 25, 2015

Harvie Heights Preliminary Debris-Flood Mitigation Design Project No.: 1286006

Page A-1


A.1 Unit rates used for cost estimates

Category Item Unit cost Unit Notes

Preparation

Mobilization and demobilization

$ 100,000 l.s.Unit cost is highly uncertain. Costs ranged from $10k to more than $1M for recent Town of Canmore work.

Clearing, grubbing and disposal

$ 10 m2

AT (2014) unit cost is $2 for clearing. Additional cost included to account for disposal.

Construction

Fill selection and placement

$ 40 m3

Based on AT (2014) unit cost for pit run gravel, ranging from $20.00 to $35.43 for supply.

Geosynthetic reinforced soil (GRS) berm

$ 60 m3

Additional $20 assumed for reinforcement cost and placement.

Modular block facing for GRS berm

$ 260 m2

Estimate provided by United Lock Block, including supply and installation.

Foundation and/or channel excavation and shaping

$ 30 m3 Based on AT (2014) unit cost for channel excavation, $26.85.

Common excavation and disposal

$ 20 m3 Based on AT (2014) unit cost for excavation, $10.23, plus disposal.

Culvert installation

Steel pipe culvert, supply and install (1000 mm)

$ 4,000 m

Based on AT (2014) unit cost list for typical culvert diameter of 900 mmplus premium added for pipe ramming.

Erosion protection

Riprap supply and place - Class 3

$ 140 m3

Based on 75th percentile of bids received by the Town of Canmore in 2013.

Riprap supply and place - Class 4

$ 175 m3


Grout reinforcement $ 60 m3

Based on concrete cost of $200 per cubic meter and ~30% void ratio around riprap.

Articulated concrete mats

$ 300 m2


Engineering

Engineering design, construction management & environmental permitting

10% %Percentage of capital costs. Assumed, high uncertainty.



Page A-2


Cost estimates are considered to be “conceptual-level”, associated with an accuracy of roughly -

25% to +75%, given the design assumptions described in this report. Variations larger than this

are possible if the design concepts or risk reduction targets are significantly changed. Each

cost estimate is based on estimated quantities (e.g. volume of earthworks) and assumed unit

rates, which are based on contractor bids on related projects for the Town of Canmore and a

summary of unit rates tabulated by Alberta Transportation (AT, 2014). It is important to note

that the cost estimate is highly sensitive to riprap costs.

A.2 Harvie Heights Preliminary Debris-Flood Mitigation Design Cost Breakdown

North Harvie Heights Diversion Berms

Harvie Heights Saddle Berm

Category Item Quantity Unit Unit cost Item total cost

Preparation


1 l.s. $ 100,000 $ 100,000


4200 m3 $ 10 $ 42,000

Berm construction


2,640 m3 $ 60 $ 158,400

Modular block facing for GRS berm

100 m2 $ 260 $ 26,000

CONSTRUCTION COSTS - ROUNDED SUBTOTAL $ 330,000


1 percent 10% $ 33,000

ROUNDED TOTAL $ 360,000


Preparation


0.5 l.s. $ 100,000 $ 50,000

Clearing, grubbing anddisposal

280 m3 $ 10 $ 2,800

Berm construction


144 m3 $ 60 $ 8,640



1 percent 10% $ 7,000




Page A-3


Harvie Heights Creek Culvert Protection at Trans-Canada Highway

Water Treatment Plant berm and Culvert


Preparation


1 l.s. $ 100,000 $ 100,000


360 m2 $ 10 $ 3,600

Berm Construction

Riprap berm supply and place – Class 4

140 m3 $ 175 $ 24,500

Culvert installation

Steel pipe culvert, supply and Install (1000 mm)

120 m $ 4,000 $ 480,000

Inlet protection (pre-cast concrete box)

1 each $ 30,000 $ 30,000

CONSTRUCTION COSTS - SUBTOTAL $ 640,000


1 percent 10% $ 64,000



Preparation Mobilization and demobilization

1 l.s. $ 100,000 $ 100,000

Berm construction

Common excavation and disposal

450 m3 $ 20 $ 9,000

Erosion protection

Riprap supply and place –Class 4

1,130 m3 $ 175 $ 197,750

Grout reinforcement 530 m3 $ 60 $ 31,800



1 percent 10% $ 34,000


Municipal District of Bighorn No. 8, Harvie Heights Creek May 25, 2015

Preliminary Debris-Flood and Debris-Flow Mitigation Design – FINAL Project No.: 1286006

HarvieHeights_Mitigation_Report_Final


APPENDIX B

MATRIX SHORT-TERM MITIGATION DESIGN DRAWINGS

A -

Bow

Val

ley

Wild

land

End T

ypic

al D

itch C

ross s

ection

Begin

Berm

/Ditch T

ransitio

n

0+00

0

0+050

0+100

0+150

0+200

0+240

0+225

0+000

0+050

0+100

0+150

0+200

Insta

ll 0.2

5 m

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ndard

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and G

utt

er

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epre

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ssin

g

at

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ays

0+00

0

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0+100

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0+200

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0+00

0

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0+100

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0+200

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ting C

ulv

ert

(Fill

Exis

ting c

ulv

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with L

ean C

oncre

te M

ix)

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erm

/Ditch

Tra

nsitio

n B

egin

Full

Berm

Cro

ss S

ection

Elevation (m)

Elevation (m)

Nort

hD

itch-A

pril2

014

1340

1344

1348

1352

1356

1360

1364

1368

1372

1340

1344

1348

1352

1356

1360

1364

1368

1372

0+

000

0+

100

0+

200

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Invert

of

Ditch t

o T

ie

into

Toe o

f S

lope o

f B

erm

-5.6

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-4.9

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-5.6

9%

-5.2

7%

-1.0

0%

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nvert

1.0

m F

lat

Gra

vel S

hould

er

1.0

m

Min

. 1.0

mV

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%

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round

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± 2

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2

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. 0.5

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%

21

21

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ting G

round

21

1.0

m

Varies

Insta

ll E

rosio

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Matt

ing

Elevation (m)

Elevation (m)

1340

1344

1348

1352

1356

1360

1364

1368

1372

1340

1344

1348

1352

1356

1360

1364

1368

1372

0+

000

0+

100

0+

200

0+

225

Top o

f B

erm

-3.2

3%

-2.8

8%

-2.1

5%

-5.2

2%

-1.9

3%

-2.0

9%

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mete

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m)

300

200

175

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kg)

40

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f C

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nly

APPENDIX A COST ESTIMATE DETAILS

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