DOWNTOWN UTILITY RELOCATION SEWER PROJECTPRESENTATION TO CITY COUNCIL2019-03-11

PRESENTATION OVERVIEW

• PROJECT CONTEXT• DESIGN CONSIDERATIONS• CONSTRUCTION• 7TH AVE SURFACE UPGRADES

PROJECT CONTEXT

FALL 2018 PUBLIC COMMUNICATION VIDEO

SANITARY SEWER WORKS:

• Re-routing and upgrading of the sanitary sewer

• Installation of a new sewer line across Queensway and along Lower Patricia

RELATED CITY UTILITY WORKS:

• Replacement and re-routing of the storm water system

• Replacement of the old watermain on 7th Avenue in front of City Hall

• New extension of the Downtown Renewable Energy System to the parkade

WATERMAIN REPLACEMENT PROGRAM

WATERMAIN

• Existing 7th Ave. watermain was rated “very high risk” for failure• Opportunity to replace this pipe alongside utility relocation work

(as part of the City’s Watermain Replacement Programme)

DESIGN CONSIDERATIONS

INITIAL SEWER RELOCATION CONCEPT – REROUTE THROUGH LANEWAY

CityHall

Parkade

++

OLD SEWER

PROPOSED SEWER (5% longer than old sewer)

SEWER SLOPES:

• Old sewer had deficient slope• Longer distance with same elevation drop = flatter pipe• Flatter pipe = slower fluid movement• Solids settle to bottom when minimum fluid velocity not met• Tendency for pipe blockages

VIEW OF LANEWAY FROM QUEENSWAY

SEWER CAPACITY LIMITING DOWNTOWN GROWTH

UNDERSIZED PIPE(downstream of new developments)

LIMITED SEWER CAPACITY (highlighted in yellow)

GRAVITY & FORCE SEWER MAINS

Image Credit: City of Northglenn

PW104 SEWER LIFT STATION

CityHall

Parkade

PROPOSED NEW POOL

OLD FIRE HALL(to be demolished)

PW104 LIFT STATION

OLD SEWER

MAP OF NEW SEWER

CityHall

PW104 LIFT STATION

PW102 LIFT STATION

NEW SEWER

CONSTRUCTION

DESIGN DRAWINGS SHOWING COMPLEXITY OF EXISTING & NEW UTILITIES

EXISTING INFRASTRUCTURE

EXISTING INFRASTRUCTURE

EXISTING INFRASTRUCTURE

EXISTING INFRASTRUCTURE – TEMPORARY STORM/SANITARY CROSSING FOR CONSTRUCTION STAGING

GROUNDWATER

TRENCHLESS INSTALLATION

EXCAVATION OF QUEENSWAY

NIGHT WORK

INTERIM LIGHTING IMPROVEMENTS

FREE DOWNTOWN PARKING

7TH AVE SURFACE UPGRADES

DRAFT 7TH AVE SURFACE DESIGN

BASALT SLAB BENCH FEATURESCAN BE USED AS BASE FOR SEASONAL PLANTERS

SURFACE DESIGN DETAILS

TREE CELL SUPPORT STRUCTURE

DECORATIVE FIXED IN PLACE BOLLARDS

BASALT RAISED PLANTER EDGES