Preferred Elevated Tank Site

Transcription

1 Preferred Elevated Tank Site Preferred Site No. 3 is on private property owned by Hopewell Developments. Approximately 5 acres of land will be required, including lands required for a permanent access road and feedermains to the new elevated tank. The new elevated tank structure will consist of a welded steel storage cell supported on a reinforced concrete shaft, with a working capacity of 9.0 ML. The tank and shaft diameters will be approximately 32 m and 18 m, respectively, and will have a top water level of masl (the same as the existing elevated tank) in order to maintain pressures in the distribution system, resulting in an overall tower height of approximately 44 metres. Preferred Site No. 3 - Hopewell Developments Conceptual Layout of Elevated Tank Site A tank drainage/overflow detention area with a controlled outlet is also proposed, to limit the discharge of peak flow from the elevated tank overflow. The tank will be connected to the existing watermain, storm, sanitary, gas, hydro and phone utility infrastructure on Coleraine Drive. A paved driveway access and parking area will also be constructed on the site, but should have negligible impact on the existing runoff characteristics for the site. A TEMPORARY WORKING EASEMENT of approx. 2 acres will also be required across the Hopewell site during construction period. View from Coleraine Drive looking north towards the existing tank on the east side and proposed elevated tank on the west side Panel 10

2 Typical Elevated Water Tank Construction Process Excavation of tank foundation Placement of reinforcing steel in tank foundation Pouring lift #4 of the concrete support pedestal Placement of wire mesh reinforcement in pedestal wall Erection of top formwork for concrete pedestal Erection of steel cone and wall plates around base of pedestal Application of exterior protective coating system by roller at ground level Hoisting of steel tank from top of pedestal Completed concrete support pedestal and steel tank Photographs taken during construction of a similar Elevated Water Tank project in Milton, Ontario Panel 11

3 Alternative Feedermain Routes Option 1: Predominantly along Future Bolton Arterial Road (BAR), Highway 50 Estimated Capital Cost: $42 million * Longer feedermain length Several trenchless crossings through valley lands Timing issues associated with construction of BAR No opportunity for community enhancement Option 2: Predominantly though potentially sensitive Humber River Valley Forest Lands Estimated Capital Cost: $30 million * Significant environmental impacts Higher Risk in the event of feedermain break Obtaining approval from the TRCA likely a challenge No opportunity for community enhancement Option 3: Predominantly though Bolton core, Highway 50 Estimated Capital Cost: $24 million * Less environmental impact; shorter feedermain length and construction to occur within road right-of-way Public coordination required Opportunity to coordinate with other development projects Temporary traffic disruption however, will provide permanent community enhancement (i.e. pavement rehabilitation on local roads, etc.) *Plus the cost of elevated tank $8.5 million (excluding land acquisition) Several Alternative Feedermain Options through Bolton Core were Evaluated Panel 12

4 Preliminary Preferred Feedermain Alternative Feedermain Option No. 3 is the Preliminary Preferred Feedermain Alternative. The feedermain will be installed within the existing road allowance; along Coleraine Drive north to King Street, east on King Street to Temperance Street, north on Temperance to Sterne Street, east on Sterne through the parking lot through the Black Bull Pub to Highway 50/Queen Street and north to Columbia Way. A connection point to the existing system would occur at the corner of Columbia Way and Kingsview Drive. The 600mm/400mm (24 /16 ) diameter feedermain will extend approximately 5.0 km from the elevated tank, buried to provide a minimum cover of 1.8 metres. The feedermain will be installed within the existing road allowance in a vertical trench, utilizing a trench box to minimize environmental impacts and site disruption. Concrete trench plugs will be installed to prevent groundwater migration along the pipeline. Permanent and Temporary Working Easement Details (Schematic only) Bolton Core Parking Lot From Hwy-50 Looking west at the Bolton Core Parking Lot (towards condominiums) Condominiums Preferred Feedermain Option No. 3 Through Bolton Core Potential Shaft Locations The feedermain crossing the Humber River will be completed via trenchless methods to minimize environmental impacts. Coordination with the Town of Caledon and traffic control measures will be required for the installation of the feedermain through the Bolton core. Traffic detours will be required, however, construction will remain out of the main Highway 50/King Street intersection to provide alternate movement through Bolton core area. Flexibility to stage construction and accelerate certain areas. Temporary disruption to traffic flow and use of parking lot, however enhancements to area will be permanent Co-ordination with the public will be required. Acquisition of Private property will be required for the installation of the feedermain through the Parking lot, as shown in the Permanent and Temporary Easement Details figure above. Senior Housing (King Nursing Home) Trenchless Crossing Potential Shaft Locations Construction Staging Area For Trenchless Crossing From Hwy-50 Looking towards Humber River Panel 13

5 Overview of Construction Methods CONSTRUCTION METHODS OPEN-CUT METHOD There are two methods that can be used to construct the feedermain they are: Open Cut Method Trenchless Method TRENCHLESS METHOD (Humber River Crossing) Generally used when depth is less than 10 m, otherwise trenchless used: Protection and/or relocation of existing utilities Removal of soil from trench Placing of imported bedding material and pipe Backfilling of pipe Temporary restoration of road The feedermain crossing the Humber River will be completed via Trenchless method to minimize environmental impacts. Construction of line valves and chambers at selected locations Final restoration of road Define construction staging areas and excavation of entry and exit shaft Advancement of trenchless excavation using an electric Tunnel Boring Machine (TBM) or Horizontal Directional Drilling (HDD) Removal of soil through the shafts As most of the feedermain is within the road right-of-way, where there are existing utilities, the proposed feedermain will have to be installed below the existing utilities. Open cut construction will be a minimum of 5.0 m deep and will be carried out using a trench box to avoid completely tearing up the existing road. Installation of feedermain Once the feedermain is constructed the shaft sites will be returned to original condition Panel 14

6 Actions to Limit Construction Impacts TRAFFIC MANAGEMENT AIR QUALITY A traffic plan (for exit and entry shaft locations) will regulate construction traffic. For pedestrian safety, hoarding is to be installed around construction site areas. For open cut construction, closure of traffic lanes, identification of detours and temporary access routes, will minimize the impact to property owners and commuters Standard dust reductions measures to include: Keep on-site truck movements to a minimum Maintain truck wheel cleaning stations at each construction site Clean and wash streets adjacent to the construction areas Use MOE approved chemical binder dust suppressant as circumstances warrant NOISE NATURAL FEATURES Restricted hours of operation, per Town of Caledon noise by-law Hoarding around construction sites Using mufflers and other noise-reducing features of construction equipment During construction: Install sediment and erosion controls throughout the construction area Minimize vegetation removal within route alignment to the extent possible Prune damaged roots and branches appropriately Replace any trees to be removed with similar vegetation Remove all stockpiles upon completion of the works and the sites restored Panel 15

7 Traffic Management As construction of the feedermain progresses along the recommended route, there will be traffic disruptions. Open cut construction will require lane closures ( m stretches) that advance as the pipe is installed. Access to properties will be maintained at all times. King Street Proposed mitigation measures include: Use of traffic diversions to maintain level of service; Advance notification signage. Public notification will be continued during detailed design and construction to keep you informed of what will be happening and when. Adjacent businesses, residents, senior s home and community services (i.e. EMS, fire, school boards) will be notified in advance of the timing of construction. The proposed watermain on King St. will be installed on: North-side from Colerain Dr. to HESP Dr. South-side from HESP Dr. to Temperance St. Temporary lane closure during construction as shown in the figure above will be maintained, in accordance with Ontario Traffic Manual - Book 7. Pedestrian sidewalk along King Street will be maintained during construction. Access to intersecting roadways will be maintained during construction. Access to local residences and business will be maintained at all times. Emergency vehicle access will be maintained at all times. Expected construction duration: 3 to 4 months. Panel 16

8 Traffic Management (Cont d) Queen St. N. / Highway-50 Bolton Core Parking Lot Proposed 400mm dia. Feedermain Proposed Shaft for trenchless crossing Ann St. Proposed 400mm dia. Feedermain Timothy St. Shaft for Drain Chamber Approx. Limit of Work Zone The proposed watermain will be installed mostly on the west side of Hwy-50. Temporary partial lane closure and lane shift as shown in the figure above will be maintained during construction in accordance with Ontario Traffic Manual - Book 7. Two-lane northbound and one-lane southbound will be maintained at all times. Centennial Drive South Access will be temporarily closed. Access to local residences and business will be maintained at all times. Pedestrians to use east side of Queen Street/Hwy-50 during construction. Emergency vehicle access to be maintained at all times Expected construction duration: 3 to 4 months. Hwy-50 Work zone to be fenced and temporary road work condition to be in accordance with Ontario Traffic Manual - Book 7. Access to staging zone areas to be determined during construction. Access to the parking lot to be maintained at all times during construction. Entrance from Queen Street to be temporarily closed during drain chamber construction. Contractor to arrange proper parking location for crew and construction vehicles outside the business parking area. Access for pedestrians and emergency vehicles to buildings will be maintained at all times. Expected construction duration: 3 to 4 months. Panel 17

9 Impacts and Mitigation Potential Anticipated Impact Proposed Mitigation Measures Due to the small footprint required for the new elevated tank and the lack of existing natural features in the proposed site, the impacts to the natural environment are expected to be negligible; however site clearance for construction of the new tank will involve disturbance to agricultural area Some temporary and localized impacts in terms of noise, vibration, dust, mud and traffic increase resulting from the construction of new elevated tank Disturbed areas will be restored to original or improved conditions as soon as construction is complete Construction equipment will be operated as per the Town of Caledon s local noise by-law. Adjacent businesses, residents, senior s home and community services (i.e. EMS, fire, school boards) will be notified in advance of the timing of construction and provided with Region contact information should they encounter any problems during construction Temporary construction walls or fencing around construction area to minimize noise, dust, mud and visual impacts Standard best practices for vehicle and pedestrian safety will be used throughout the construction area Spills of hazardous materials during construction (e.g., fuels, hydraulic fluids) Standard sediment and erosion control measures will be implemented during construction to minimize effects from spills Contractor to have designated fuel filling station and spill clean-up kits on site Potential to impact cultural resources Archaeological assessments will be completed prior to project implementation to assess the potential risk of impacts to archaeological features Crossing of Humber River using trenchless methods on fish and fish habitat Impact will be avoided by use of trenchless methods under watercourse Minimal traffic impact at entry and exit shaft locations Controlled access to shaft areas Construction will be fenced off and shaft areas enclosed Potential impact to through traffic during Feedermain installation Most of the feedermain will be constructed using open-cut methods within the existing right-of way Traffic control measures will be implemented Staged construction will reduce impacts Emergency services will not be disrupted Limited use of parking lot in Bolton core Parking use will return to normal upon completion of project Use of signage to direct auto and pedestrian traffic to alternative routes The potential contractor will be required to maintain access to the parking lot at all times Also Construction vehicles and personal vehicles of construction crew will not be allowed to use the parking lot Panel 18

10 Next Steps Following this Public Information Centre, the Project Team will: Receive and incorporate comments from the public and agencies until January 12, If no significant comments are received following this PIC, the Project Team will proceed to finalize the preferred elevated tank site and feedermain route and complete the Environmental Study Report (ESR) in early Notices will be placed in local newspapers to announce where and when the Environmental Study Report will be available for a 30-day public review period and will advise the public of its rights to requesting a Part II Order under the Ontario Environmental Assessment Act. If no significant issues arise, the Region will proceed with implementing the Study. Construction is scheduled to begin in Panel 19

11 Project Contacts THANK YOU FOR ATTENDING THIS PUBLIC INFORMATION CENTRE! Please complete a comment sheet and place it in the box provided or send it back to the address shown on the form. Your comments will be considered in the assessment and evaluation of the preferred Elevated Tank site and Feedermain alignment. Comments Forms are provided for your convenience and may be completed here or returned by January 12, Italia Ponce, P.Eng. Project Manager The Regional Municipality of Peel 10 Peel Centre Drive Brampton, ON L6T 4B9 Tel: ext Fax: italia.ponce@peelregion.ca OR Chris Hamel, P.Eng Consultant Project Manager AECOM 105 Commerce Valley Drive West, 7 th Floor Markham, ON L3T 7W3 Tel: Fax: chris.hamel@aecom.com Panel 20