Wast stewater r Treatm tment P t Project Colquitz Coalition - - PowerPoint PPT Presentation

Wast stewater r Treatm tment P t Project

Colquitz Coalition – Annual General Meeting February 13, 2019

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Pr Project ct Comp

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McLoughl ghlin Po Point W Wastew ewater Trea reatment P Plant: provides tertiary treatment to the core area’s wastewater.

• Residuals T

Treatm tment t Faci cility ty: treats residual solids from the McLoughlin Point Wastewater Treatment Plant to produce “Class A” biosolids.

• Conveyance S

e Sys ystem em: carries wastewater from across the core area to the McLoughlin Point Wastewater Treatment Plant, and residual solids to the Residuals Treatment Facility at Hartland Landfill.

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Pr Project ct Ov Overvi rview M Map

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Resi sidual ual Sol

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s Con

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ance Line

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• 19.3 km forcemain
• 12.4 km return
• Pipes will be built within previously-disturbed

existing road or path rights-of-way:

• At Colquitz River crossing: deviation of 4m from

roadway for 40m.

• At Ward Creek crossing: deviation of 30m from

roadway for 100m.

• Estimated footprint of project is 3.8 ha,

approximately 95% of which will be within previously-disturbed areas

Pi Pipe pe C Context xt

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Regu gula latory

• Core Area Liquid Waste Management Plan
• Amendment 11
• Municipal Wastewater Regulation
• Section 40 Notice from a Director
• Water Sustainability Act
• Section 11 Notifications
• Fisheries Act
• Request for Review
• Navigation Protection Act
• Navigation Protection Program
• District of Saanich

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• Pipes will pass through the Tod Creek and Colquitz River

watersheds, and the Portage Inlet drainage

• 23 Watercourse Crossings
• 12 fish-bearing and 11 non-fish bearing
• 6 wetlands in proximity to the alignment
• Majority of watercourse crossings will not involve instream

work.

• Only instream works will be crossings of Ward Creek,

Goward Springs A, Peers Creek, and Colquitz River.

Watercour

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Potenti tial l Con

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tructi tion

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Eff ffects ts

• Harm to fish and fish

habitat.

• Harm to terrestrial

mammals, amphibians, and reptiles.

• Harm to migratory birds or

their nests due to vegetation clearing and/or hazard tree removal.

Mi Miti tigati tion

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Measures

• Comply with Water Sustainability Act

permit conditions.

• Submit Request for Review to Fisheries

and Oceans Canada.

• Implement an Envi

vironm

• nment

ntal al Manag anagement nt P Plan lan during construction:

• Fish and amphibian salvage;
• Pre-clearing nest surveys; and
• Environmental monitoring.
• Time construction to minimize effects:
• Clearing outside of the breeding

bird window; and

• In-stream works completed

within the reduced risk window.

Fish and W d Wild ldli life

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Potenti tial C l Con

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tructi tion

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Eff ffects ts

• Erosion of exposed soil and

deposition of sediment into the watercourses, leading to effects on aquatic species and habitats.

• Release of particulate waste to

aquatic habitat.

• Spills of hazardous materials

into aquatic habitat.

• Blasting related changes to

groundwater hydrology leading to effects on nearby wells.

Mi Miti tigati tion

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Measures

• Maintain compliance with all federal and

provincial requirements for water quality

• Eros
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and Sediment nt Cont

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• l Plan

lan to prevent erosion and protect watercourses from sediment.

• Pr

Protect ection o

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ercourses during construction.

• Was

astewater Manag anagement nt P Plan lan to properly dispose of water used during construction and commissioning.

• Spill

l Respons

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Plan lan to reduce risk and impact of spills during construction.

• Blas

lasting ng M Manag anagement nt Plan lan to protect fish bearing watercourses, structures, groundwater wells and human health.

Water Qu r Quali lity ty

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Ward Creek crossing location Existing Peers Creek culverts

Pr Propo posed C d Crossing g Loca cati tions

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View of Colquitz crossing location Downstream of Ward Creek crossing location

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• Majority of watercourse crossings will not involve instream

work.

• For bridge crossings at Admirals Bridge and Tillicum Bridge, pipe

will be suspended from existing bridge

• For culvert crossings the pipe will be installed over the culvert

where possible

• Where the pipe must be installed underneath, a ‘punch and

bore’ method will be used

• Trenches excavated on both sides of the existing

culvert

• Borehole drilled underneath culvert to connect

trenches

• Pipe will be installed through borehole
• Only instream works will be at Ward Creek, Goward Springs A,

Peers Creek, and Colquitz River.

Watercour

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Cros

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Plan v n view o

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f a typi pical pu punc nch h & bo bore i ins nstallation Profi file v view o

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f a typi pical pu punc nch h & bo bore i ins nstallation

Watercour

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Cros

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ng Method hods

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• Only instream works will be crossings of Ward Creek, Goward

Springs A, Peers Creek, and Colquitz River.

• Goward Springs A and Peers Creek works will involve culvert

replacements

• Ward Creek and Colquitz River works will be “open cut”

installations

• All instream works will be completed during the Reduced Risk

Timing Window (June 15 – September 15)

• For work on the Colquitz, a restoration plan will be implemented

upon completion of works to minimize erosion and restore disturbed vegetation

Ins nstream W am Wor

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Ins nstream W am Wor

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Typi pical fi fish h isolation s n setup p using ng 5 mm m mesh ne h nets Typi pical flow i isolation n setup p using m ng meter ba bags gs

Ins nstream W am Wor

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Exampl ple o

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f site isolation n using ng meter ba bags gs a and nd machi hine nery ope perating o ng outside de o

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f active cha hanne nnel.

Ins nstream W am Wor

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• A detailed restoration plan has

been prepared for the Colquitz crossing at Marigold Road

• Elements include:
• 1. Channel Bed Restoration
• 2. Bank Stabilization
• 3. Riparian Vegetation

Restoration

Sit ite R Res estoratio ion

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Questions?

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