ppt-downtown utility relocation sewer project.ppt
TRANSCRIPT
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DOWNTOWN UTILITY RELOCATION SEWER PROJECTPRESENTATION TO CITY COUNCIL2019-03-11
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PRESENTATION OVERVIEW
• PROJECT CONTEXT• DESIGN CONSIDERATIONS• CONSTRUCTION• 7TH AVE SURFACE UPGRADES
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PROJECT CONTEXT
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FALL 2018 PUBLIC COMMUNICATION VIDEO
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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
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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)
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DESIGN CONSIDERATIONS
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INITIAL SEWER RELOCATION CONCEPT – REROUTE THROUGH LANEWAY
CityHall
Parkade
++
OLD SEWER
PROPOSED SEWER (5% longer than old sewer)
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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
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VIEW OF LANEWAY FROM QUEENSWAY
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SEWER CAPACITY LIMITING DOWNTOWN GROWTH
UNDERSIZED PIPE(downstream of new developments)
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LIMITED SEWER CAPACITY (highlighted in yellow)
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GRAVITY & FORCE SEWER MAINS
Image Credit: City of Northglenn
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PW104 SEWER LIFT STATION
CityHall
Parkade
PROPOSED NEW POOL
OLD FIRE HALL(to be demolished)
PW104 LIFT STATION
OLD SEWER
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MAP OF NEW SEWER
CityHall
PW104 LIFT STATION
PW102 LIFT STATION
NEW SEWER
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CONSTRUCTION
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DESIGN DRAWINGS SHOWING COMPLEXITY OF EXISTING & NEW UTILITIES
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EXISTING INFRASTRUCTURE
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EXISTING INFRASTRUCTURE
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EXISTING INFRASTRUCTURE
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EXISTING INFRASTRUCTURE – TEMPORARY STORM/SANITARY CROSSING FOR CONSTRUCTION STAGING
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GROUNDWATER
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TRENCHLESS INSTALLATION
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EXCAVATION OF QUEENSWAY
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NIGHT WORK
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INTERIM LIGHTING IMPROVEMENTS
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FREE DOWNTOWN PARKING
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7TH AVE SURFACE UPGRADES
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DRAFT 7TH AVE SURFACE DESIGN
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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
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