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 1

Pr Project ct Comp ompone onent nts Mc 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. 2

Pr Project ct Ov Overvi rview M Map 3

Resi sidual ual Sol olids C s Con onveyan ance Line 4

Pipe Pi pe C Context xt • 19.3 km forcemain • 12.4 km return • Pipes will be built within previously-disturbed existing road or path rights-of-way: o At Colquitz River crossing: deviation of 4m from roadway for 40m. o 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 5

Regu gula latory • Core Area Liquid Waste Management Plan o Amendment 11 • Municipal Wastewater Regulation o Section 40 Notice from a Director • Water Sustainability Act o Section 11 Notifications • Fisheries Act o Request for Review • Navigation Protection Act o Navigation Protection Program • District of Saanich 6

Watercour ourse C Cros ossing ngs • 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. 7

Fish and W d Wild ldli life Potenti tial l Miti Mi tigati tion on Me Measures Con onstr tructi tion on E Eff ffects ts Comply with Water Sustainability Act • permit conditions. Harm to fish and fish • Submit Request for Review to Fisheries habitat. • and Oceans Canada. Implement an Envi vironm onment ntal al Harm to terrestrial • • Manag anagement nt P Plan lan during construction: mammals, amphibians, Fish and amphibian salvage; and reptiles. o Pre-clearing nest surveys; and o Environmental monitoring. Harm to migratory birds or o • Time construction to minimize effects: their nests due to • Clearing outside of the breeding vegetation clearing o bird window; and and/or hazard tree In-stream works completed removal. o within the reduced risk window. 8

Water Qu r Quali lity ty Potenti tial C l Con onstr tructi tion on Miti Mi tigati tion on Me Measures Eff ffects ts Maintain compliance with all federal and • provincial requirements for water quality Erosion of exposed soil and • deposition of sediment into the Eros osion on and and Sediment nt Cont ontrol P ol Plan lan to • watercourses, leading to prevent erosion and protect watercourses effects on aquatic species and from sediment. habitats. Pr Protect ection o of Water ercourses during • Release of particulate waste to construction. • aquatic habitat. Was astewater Manag anagement nt P Plan lan to • Spills of hazardous materials properly dispose of water used during • into aquatic habitat. construction and commissioning. Blasting related changes to Spill l Respons onse P Plan lan to reduce risk and • • groundwater hydrology leading impact of spills during construction. to effects on nearby wells. Blas lasting ng M Manag anagement nt Plan lan to protect fish • bearing watercourses, structures, groundwater wells and human health. 9

Pr Propo posed C d Crossing g Loca cati tions Ward Creek crossing location Existing Peers Creek culverts 10

Prop opos osed C Cros ossing ng Loc ocations ons View of Colquitz crossing location Downstream of Ward Creek crossing location 11

Watercour ourse C Cros ossing ng Method hods • 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. 12

Watercour ourse C Cros ossing ng Method hods Plan v n view o of f a typi pical punc pu nch h & bo bore i ins nstallation Profi file v view o of f a typi pical pu punc nch h & bo bore i ins nstallation 13

Ins nstream W am Wor orks • 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 14

Ins nstream W am Wor orks Loc ocations ons 15

Ins nstream W am Wor orks Loc ocations ons 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 orks Loc ocations ons Exampl ple o of s f site isolation n using ng meter ba bags gs a and nd machi hine nery ope perating o ng outside de o of f active cha hanne nnel.

Sit ite R Res estoratio ion • 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 18

Questions? 19