(Water Treatment Plant)
Black Mountain Irrigation District Capital Projects
(Water Treatment
Plant)
Project 1 – Water
Treatment Project
The objective of the water
treatment project is to reduce suspended solids, color and total organic carbon
levels in the water which will in turn reduce THM levels. The water treatment
goal for turbidity is to meet the MAC of 1.0 NTU throughout the year. The goal
for color is to meet aesthetic objective (AO) of 15 TCU at all times of the year
with the average less than 5 TCU.
Of the chemicals tested,
alum produced the best results, falling within acceptable levels for residual
aluminum, and lowering turbidity significantly. From the pilot project, the
demand for Chlorine was approximately half of raw settled water. The proposed
location for the treatment facility is confirmed to be upstream of Stevens
Reservoir where the system can operate by gravity.
Project 2 - Lower
Garner Road
This improvement project
provides the District with a second connection to PZ 553 and strengthens the
watermain grid in the lower zone.
This connection lessens the
possibility of stagnant water forming in the stub lines, particularly during low
times in the winter.
Flow capacity is improved to
the lowest zone in the Belgo area.
It allows for servicing
around and isolation of PRV 7.
Because of the steep slope
along the west side of Belgo Road, additional watermain would likely be required
as the connection would be 100 meters north of the intersection.
Project 3 - Teasdale
Road
This improvement project
strengthens the District’s grid in the lower area of the Belgo water system.
This connection lessens the
possibility of stagnant water forming in the stub lines, particularly during low
times in the winter and provides an alternate feed when required. This
improvement work affects only a small portion of the District.
Project 4 - PRV 7
Upgrading
This improvement project
allows the District to properly service PRV 7. Presently there is only one line
feeding the majority of the Belgo area. This line splits at PRV 7 into two
areas. Presently there is a problem with the existing butterfly valve at the
station and no means of isolating the water system nearby upstream.
Peak velocities through the
larger 10" PRV are estimated at 15.9 feet/second which is high and
marginally acceptable. Peak velocities through the smaller 6" PRV are
estimated at 13.6 feet/second.
Approximately 200 cubic
meters of water will have to be safely discharged when shutting down the water
system. Fittings for the water system are a significant cost. Two 20"
butterfly valves, one to replace the defective one in the station and a second
to install near the feed to upper Garner Road, will be required. Also needed
will be concrete cylinder pipe fittings and saw cutting of the concrete cylinder
pipe.
Project 5 - PRV 1
Upgrading
This project involves the
installation of a larger valve in the station complete with bypass piping. A
flow meter is recommended in this location as this is a key monitoring location
in the District.
Work would have to be
performed in the off peak times, and is much easier now that the Wallace Road
main is installed. Construction work is recommended to be scheduled in the late
fall.
Peak summer flow through the
12" valve, with the Wallace Road PRV on-line taking 1400 Usgpm, is
estimated to be 7500 Usgpm. This equates to a peak water velocity through the
valve of 21 feet/second. Accounting for the possibility of additional
development in the Rutland flatlands and along Highway 97, the future peak flows
could be as high as 14000 Usgpm. The large valve size should be in the range of
500mm diameter. Alternately two 12" PRV’s could be used but would not fit
within the existing vault.
This work will benefit all
new development in the Rutland area and along Highway 97, and the existing water
users. Costs have been split apportioned on water demand as new development will
determine the timing for when the upgrade will be necessary.
Project 6 - Booster
Station No. 1 Improvements
In accordance with FUS fire
protection guidelines, either reservoir storage or standby power is required for
areas serviced by a booster station. The existing station boosts the water from
90 psi to 132 psi. Even with a power failure, the majority of the service area
has water except at the highest elevations. To provide emergency supply to this
service area, three options exist:
The booster station
improvements were to provide additional water supply capacity so that
development could proceed in the area surrounding the Black Mountain
subdivision. The works designed in 1990 were to install a 100 hp and a 20 hp
pump plus valves, meter and renovation to the existing building.
The work identified in this
improvement project will benefit primarily new development. There will be some
benefit to the existing users in the Black Mountain subdivision. Costs have been
split apportioned on benefit.
Project 7 - Highway 97
Improvements
This work provides
interconnection of the western limits of the distribution system. Three separate
projects are identified as part of the Highway 97 water system improvements.
These include:
Benefits of this work are
new development on the west side of the Highway. It is foreseen that this work
will develop on a piecemeal basis as new areas come into the District and
require water.
Project 8 - Campion
Road Interconnection
It is estimated that there
is limited fire protection at the limits of Campion Road. The system capacity
can supply fire protection in the range of 2200 Usgpm with adequate residual
pressure. To supply the District criteria of 2500 Usgpm, this connection will be
required.
The benefits of this work
are both new and existing development in the industrial subdivision.
Project 9 - Upper
Wallace Road
This improvement project
provides the District with a second connection to the Rutland flats area from
the higher pressure zone. System supply capacity is improved. A second
connection would be provided to both the 512 meter and 475 meter pressure zones.
This project will result
primarily from new development and the majority of the cost will be paid by
development, either by CEC contributions or installation by developers.
Benefits of this work are
primarily new development. The only benefit to existing users is of a secondary
feed to the lower zone.
Project 10 - Scotty
Creek Road Improvements
Concerns exist with the
supply of water from the Scotty Creek intake including chlorine contact time,
exposure to low level runoff in the watershed, and quick changes in the raw
water quality. The source is excellent for irrigation purposes and should
continue to be used as such. This source however, has a higher risk than other
District raw water sources.
In terms of domestic use,
there are approximately 21 single family residences and two trailer parks
totaling 230 domestic units in the Scotty Creek area. Converting the majority of
these domestic connections to either the wells in the area or to the Mission
Creek source is an option for this project.
Consideration was given to
converting the entire water system onto the Mission Creek source but was ruled
out as the majority of capacity is for irrigation and is already in place and
this would be a large capital expenditure that would duplicate what is already
in place.
Two options exist, 1) extend
watermains to the area; or 2) convert trailer parks over and use point of use
treatment for the remainder.
Project 11 - Supply
Conduit Drainage
The location of this main
supply conduit is high on the silt bluffs above Mission Creek between the tunnel
and the lower settling basin. As such, it is exposed to the possibility of
washouts or slope failures along the hillside. It is recommended that BMID take
steps to minimize the slope failures or washouts to what can reasonably be
foreseen. A failure during a time of high summer demand could result in severe
economic loss to the District. The District must take all reasonable steps to
secure their main source of supply.
A detailed assessment of
flows was carried out for gullies flowing across the supply conduit. The
proposed project involves the improvement of culvert inlet capacities,
installation of culverts in major drainage channels and clean up of certain
works. This project has high benefit to existing users and has relatively low
capital costs.
Project 12 - Scada to
Upper Watershed
This project allows for the
control of release from the larger upper level storage facilities on BMID in the
Mission Creek watershed. The largest storage reservoirs are Ideal Lake (5500
ac-ft), Graystoke Lake (3650 ac-ft) and Fish Hawk Lake (1500 ac-ft). Monitoring
should be developed at the two largest sites. In most years, access is difficult
in the early spring when the reservoirs are filling.
Flow measurement will be
required from the release point from the dams, motorized control of the control
valve/gate, transmitting and receiving capability, and a power source to operate
the aforementioned.
Project 13 - Black
Mountain Reservoir
As the primary supply
conduit from Mission Creek approaches capacity of 40000 Usgpm, there will be a
need for lower level storage. The reasons and beenfits of this reservoir are
presented in detail in the Briefing report prepared for the District in 1995.
This work benefits the new
development and to a lesser extent the existing users. It is also a project of
significant magnitude that one developer would not be able to cover a
significant portions of the cost of these works.
Project 14 - Reservoir
Disaffection Facilities
During the construction of
Black Mountain Reservoir, new disinfection facilities must be installed. In the
Briefing report, order of magnitude costs for ozonation, chlorination and
chloramination facilities were presented for comparison purposes. Two facilities
were priced out, one at the north and one at the south end of the reservoir. In
review of the concepts, it will be more likely be more feasible to install one
disinfection facility at the south dam and additional piping from the south dam
back through the south dam, across the reservoir floor to the north dam conduit.
Project 15 - East
Bench Trunk Main
This improvement project
provides the District with a feed from the future Black mountain Reservoir to
the north end of the District and reduces velocities in the existing 36"
diameter trunk main. The scope of work would be from the discharge from the new
reservoir to the top of Swainson Road.
This work benefits primarily
new development along the Rutland bench and flatlands.
Project 16 - Tower
Ranch Supply
This includes work from
Swainson Road above Booster Station No. 2 to the limits of the Tower Ranch site.
As a result of the hydraulic analysis carried out in this study, the main size
from Swainson northwards can be reduced from a 900 mm to 750 diameter. This work
benefits only the existing users in the Belgo area.
Project 17 - East
Bench Trunk Main to Gibson Road
This project involves
connection from the East Bench Trunk Main down an easement across McKenzie Road,
through another easement to Gibson Road. This provides the majority of the water
system with a second connection. Two PRV’s are required.
Timing of this project would
be after Black Mountain Reservoir and Disinfection facilities, and the East
bench trunk main are constructed. This work benefits primarily new development
in the Rutland flats area.
Project 18 - Gibson
Trunk main to North End
This project consists of
increasing the flow capacity of watermains from the connection at the East Bench
trunk main northwards to Old Vernon Road. The project will be necessary as
development occurs in the Rutland flats area which will eventually restrict the
water supply capacity to the Industrial lands in the northwest corner of the
District. The installation of this main will be part of water supply to the
northwest limits.
Project 19 - Old
Vernon Road (North Segment)
Two options are presented
here, one to feed domestic water from the Mission Creek water system, the second
to provide point of use treatment to those users. With only an estimated 22
domestic connections fed from Scotty Creek not including the mobile home parks,
the cost estimated is high on a per unit basis. This work benefits only the
existing domestic residences in the Scotty Creek area that are fed from the
Creek.
Project 20 - Old
Vernon Road (West Segment)
This connection is dependent
on the upstream connections being made above and along Gibson Road and up to the
East Bench trunk main. The connection proposed would strengthen the watermain
grid in the northwest industrial grid. This connection will also provide a
possibility of three feeds to the Rutland flats area. Development in Rutland
will have an adverse effect on the northwest limits of the water distribution
system. This project will be development dependent and benefits the existing
area and new development.
Project 21 - Northwest
District Limits Supply
This is a development
dependent project and involves the servicing of lands presently not within a
Water District. These lands were identified in the KJWC report to fall within
the BMID service area.
The estimated water demand
for the area, should it decide to come into the district is 950 Usgpm. A 250 mm
watermain would be required.
Project 22 - East
Benchlands Supply
These works are development
dependent. The land is at a high elevation and is presently within the ALR.
Because of this, the present zoning, which restricts minimum lot sizes to 5 acre
plots, development is not foreseen in the near future.
Project 23 - Mine
Hill/Bell Mountain Development Supply
Extension of watermain onto these two higher areas of land is development dependent. Some of the land is in the ALR. Maximum daily demand to build-up is estimated to be in the range of 1200 Usgpm. A 250 mm watermain and booster station on one of the higher points of land would be required. Zones should be set up with pumping through one zone and backfeeding to that zone through PRV’s from above.
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