EJERCICIOS PARA HOMBRO, BRAZO, ANTEBRAZO Y MANO

3.7.1 Construction activities

3.7.1.1 Macaulay Point Pump Station and Grit Removal Facility

The construction associated with the Macaulay Point facility involves changes in existing buildings and expansion of the pump station at the front (north side) of the facility and the addition of a standby generator at the back (south side). A new grit removal structure and new screens also will be installed. The new buildings will be approximately the same height as the existing facility.

3.7.1.2 Clover Point Pumping and Grit Removal Facility

A new grit removal facility will be constructed in an underground structure directly adjacent to the existing pump station. Construction associated with the upgrades, including two sets of new pumps and controllers, and replacement of the screens, will occur in the new underground facility, and will require excavation and concrete form work.

3.7.1.3 McLoughlin Point Facility

Imperial Oil has been remediating the McLoughlin Point facility site for several years. This site was previously used by Imperial Oil as a bulk oil and fuel storage facility. Oil and fuel was stored in tanks. The tanks and associated contaminated soils were removed when the site was decommissioned.

The McLoughlin Point site is comprised primarily of bedrock in the east and clay in the west. Blasting will be necessary to construct the wastewater treatment facility. The CRD has negotiated with DND for permission to use a temporary construction laydown area on federal land north of the McLoughlin Point treatment facility site.

The McLoughlin Point facility requires the construction of deep concrete tanks, which will be located at various elevations on the facility site. These tanks will be constructed partially above grade to reduce rock excavation quantities and to achieve gravity discharge through the outfall. The depth of building foundations and concrete tanks varies from 0.3 m to 6 m. Other structures on the site include covered buildings to house major process equipment, an operations building, roadways, parking facilities and fencing.

3.7.1.4 Arbutus Road Attenuation Tank

The construction of the Arbutus Road attenuation tank will include clearing and grubbing of the site, and excavation and installation of an underground attenuation tank. No above ground structures will be built, except for surface access hatches needed for servicing, an access road leading to a parking area and four air vents.

3.7.1.5 Craigflower Pump Station

The new Craigflower pumping station will consist of a 7 m high building. Underground facilities extend 6.5 m below ground level. The underground structure will contain the wet well and pump room, housing four new pumps and controllers. The site will require clearing and grubbing, excavation and concrete form work. A double-walled Bioxide™ tank and double-walled diesel fuel storage tank will be installed outdoors.

3.7.1.6 Ancillary Facilities

Most of the pipes required to convey wastewater will be installed using conventional trench excavation. Excavation is usually 1 m to 2 m deep for forcemains and is variable for gravity mains. The area disturbed during installation of conveyance pipes is usually less than 5 m2 per linear metre of pipe. The pipe from Macaulay Point to McLoughlin Point, and from Clover Point to Ogden Point, will similarly be installed in road-ways. No effects on streams or other water bodies are anticipated.

From Clover Point to Ogden Point, a conveyance pipe will be installed in a trench beneath Dallas Road, or along the grassed area south of the boulevard following the alignment of a two-way bike path proposed

by the City of Victoria. The conveyance pipe from Ogden Point to McLoughlin Point will be installed by HDD beneath the entrance of the Victoria Harbour. The HDD crossing will extend from the McLoughlin Point site to the James Bay Anglers’ boat launch ramp on Dallas Road (south of the Coast Guard facilities). The James Bay Angler’s clubhouse will be relocated to the northern side of the property. No seabed disturbances will result from the HDD crossing of Victoria Harbour from Ogden Point to McLoughlin Point.

A new 1,800 mm diameter outfall to Juan de Fuca Strait will be built from the McLoughlin Point facility. The new outfall and multi-port diffuser will extend 1,700 m to a depth of 60 m below mean low water, near the terminus of the existing Macaulay Point outfall. Installation will be trenchless from the McLoughlin Point treatment facility to below the intertidal zone. Installation below the seabed in this zone will avoid potential effects on waterfowl and intertidal ecosystems. After the pipe emerges (below the intertidal zone) it will be laid on the seabed. The pipe will be weighted during the float and sink installation procedure (Stantec 2009b). Although trenching is not anticipated, if conditions require such installation, excavated materials will be replaced on top of the outfall.

New conveyance pipes will be needed to connect the proposed attenuation tank at Arbutus Road to existing wastewater infrastructure. Existing pipes will need to be regraded to allow the tank to fill and drain by gravity, thereby avoiding the need to install large pumps. A new outlet pipe will be connected to the existing East Coast Interceptor on Haro Road. This new piping will parallel existing conveyance pipes in order to minimise disturbance to the vegetation.

At the proposed new Craigflower pump station, conveyance pipes will be installed to transport sewage to the new pump station (via gravity sewer) and back to the existing northwest trunk (via forcemain). The pipes will be aligned adjacent to an existing sewer right-of-way along the shoreline of Portage Inlet and will then cross the tidal flats located at the southern extent of Portage Inlet and connect to the new pump station. The pipes will be installed using conventional trench excavation for the terrestrial portion and a trenchless method beneath the seabed for the marine crossing of Portage Inlet. No effects on streams or other water bodies are anticipated.

3.7.2 Construction Traffic

Construction traffic will be associated with delivery of equipment and supplies, workforce deployment, and transport of rock and soil. Material and equipment deliveries include 12 m3 concrete trucks, trucks delivering reinforcing steel, excavation and other equipment, haul trucks, and vehicles transporting other materials. Vehicle types will include flatbed trucks, tandems, small to large delivery vehicles, cranes, excavators and related equipment. The estimated truck traffic for concrete, steel, excavated material, and soil and fill transport during construction of the facilities are shown in Table 17.

TABLE 17

CONSTRUCTION TRUCK TRAFFIC ESTIMATES

Facility location

Macaulay

Point Clover Point

McLoughlin Point

Arbutus

Road Craigflower

Estimated time to completion 1 year 1 year 3.5 years 1 year 1 year

Clearing or grubbing and aggregate

Total No. of trucks required*

20 20 63 75 20

Excavation Total No. of trucks required* 233 233 2884 900 100

Peak activity per day 13 13 60 20 10

Concrete Total No. of trucks required* 80 80 1106 275 60

Peak activity per day 7 7 20 10 6

Reinforcing steel

Total No. of trucks required* 3 3 23 10 2

Peak activity per day 1 1 1 1 1

Other Deliveries

Peak activity per day

2 2 2 2 2

Source: Stantec 2009a, Cowley pers. comm.

3.7.3 Labour Force during Construction

Table 18 presents the estimated labour force during construction. Some construction activities will occur simultaneously to reduce the overall construction timeline and increase efficiency. At certain times during facility construction, several work crews may be on-site concurrently. The contractors and the CRD will minimise adverse effects by informing the public of construction schedules and traffic routing.

TABLE 18

SUMMARY OF ESTIMATED CONSTRUCTION LABOUR FORCE NEEDED TO BUILD THE SPECIFIED WASTEWATER FACILITIES

Facility Estimated Time to Completion Construction Labour Force

Macaulay Point pump station, grit

removal, and screening 1 year

Average 22 workers per day for 1 year with a peak of 44 workers per day.

Clover Point pump station, grit

removal, and screening 1 year

Average 14 workers per day for 1 year with a peak of 29 workers per day.

McLoughlin Point liquids wastewater treatment

3.5 years

Approximately 38,800 worker-days per year of site labour or an average of 155 workers per day and a peak of 308 workers per day during the concrete work.

Arbutus Road

1 year Average 15 workers per day for 1 year with a peak of

20 workers per day Craigflower

1 year Average 12 workers per day for 1 year with a peak of

20 workers per day Ancillary facilities

(conveyance pipes and tunnels)

1.5 years

Each conveyance construction crew could be composed of approximately 10 workers per day and a peak 15 workers per day. An average of 84 workers per day would be dispersed at the conveyance route construction sites with a peak of 169 workers per day. 2 years for Ogden Point to

McLoughlin Point tunnel

Tunnel construction crew could be composed of 25 workers per day with a peak of 50 workers per day.

Source: Stantec 2009a, Cowley pers. comm.

3.7.4 Construction Schedule

During the design stage, different options for building the facilities may be considered. These methods are intended to improve the cost, time and reliability performance of construction. The construction schedule and project milestones based on an in-service date of the second quarter of 2018 are presented in Table 19 (note this schedule is subject to revision as the project proceeds).

Rock outcrops encountered at McLoughlin will be removed to level the site and the rock will be crushed for reuse as fill, providing the rock is not contaminated. Peak activity will be about 13 trucks per day for Macaulay and Clover Points, 60 trucks per day at the McLoughlin Point site, 20 trucks per day at the Arbutus Road site and 10 trucks per day at the Craigflower site.

Concrete volume estimates are based on an average building height of 4 m. A 300 mm slab is assumed for all buildings. Peak activity will be approximately 7 trucks per day during concrete-pouring activities at Clover Point and Macaulay Point, 20 trucks per day at McLoughlin Point, 10 at Arbutus Road and 6 trucks per day at Craigflower. It is assumed that the concrete will not be prepared on-site. Trucks transporting materials needed for construction of the facilities, such as concrete, structural and reinforcing steel and aggregates will be coming from the Upper Victoria Harbour industrial area. Pipes and equipment could be transported by truck to the facility site from the Swartz Bay ferry terminal or by barge to McLoughlin Point.

TABLE 19

TENTATIVE CONSTRUCTION SCHEDULE FOR THE CAWTP FACILITIES

Task

2012 Quarters 2013 Quarters 2014 Quarters 2015 Quarters 2016 Quarters 2017 Quarters 2018 Quarters

1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 McLoughlin Point site

remediation McLoughlin Point facility

indicative design Arbutus Road attenuation

tank design Arbutus Road conveyance

and pumping design McLoughlin outfall and Ogden to McLoughlin HDD

indicative design Craigflower pump station

design Craigflower pump station

construction Craigflower conveyance

construction Arbutus Road attenuation

tank construction McLoughlin Point facility

and outfall construction Currie Road to Clover Point

conveyance construction Clover Point to Ogden

Point conveyance construction Ogden to McLoughlin HDD

crossing Clover Point pump station

upgrade construction Macaulay Point pump

station upgrade construction Commissioning of facilities Page 3 4

3.7.5 Construction Health, Safety, and Nuisance Effects 3.7.5.1 Health and Safety

The construction activities will comply with safety criteria established by OSHA, WCB and NFPA. Workers will be trained in health and safety requirements. Temporary safety fencing and warning signs will be installed around the construction site.

A traffic management plan will address safety, road closures, work zone speed limits, traffic disruptions, truck traffic and access maintenance to nearby institutions and residences during construction. Flag persons will direct vehicles and pedestrians around the construction site. Construction drivers will observe speed limits and exercise caution.

3.7.5.2 Noise

Proper safety procedures will be observed to ensure the noise exposure to construction workers during construction is within permitted levels. If necessary, the contractor and the CRD will install temporary safety fencing and warning signs around the construction site to inform the public of noise levels at the construction sites.

Construction activities must comply with the relevant municipal noise bylaws for hours of work and noise levels. Work is allowed to occur Monday to Saturday from 7 am to 5 pm, with no work on Sundays or holidays (except in an emergency).

Construction activities such as running excavation vehicles, truck deliveries, and using chainsaws, compressors, water pumps, concrete pouring pumps, rock breakers, and blasting and blasting signals will be sources of noise potentially heard by nearby residents. Generally, potential noise sources can be controlled to meet noise standards at the site property lines.

3.7.5.3 Vibration

Potential sources of vibration during construction include heavy equipment movement, excavator operation, blasting and use of compactors and paving equipment.

People nearby may be affected by vibration (from construction activity such as blasting), even when vibration is only slightly in excess of perception levels. Activities causing vibration will occur only between 7 am and 5 pm Monday to Saturday. Nearby residents and businesses will be informed and advised about work periods that may cause abnormal vibration.

The Contractor must ensure that workers are not exposed to vibration in excess of the limits specified in the OHSA Regulations.

3.7.5.4 Dust and Mud

Construction may generate short-term localised dust with associated air quality impacts. Air emissions generated by construction include fugitive dust and equipment exhaust. Trucks will have box covers when hauling soil or other granular materials that could create dust nuisances.

During wet weather, trucks may deposit mud from excavated areas on roads off site. On-site wheel washing facilities will be provided and street cleaning will be done if mud tracking becomes a problem. The CRD Code of Practice for “Construction and Development Activities” will be used to minimise dust and mud impacts. Erosion and sediment control plans will be prepared and implemented during construction.