Carl Fiset Engineer Centre Lac-Brome December 8, 2012 Contents - - PowerPoint PPT Presentation

presented by

Carl Fiset

Engineer

Centre Lac-Brome December 8, 2012

Contents

Length of the presentation: 1 hour Current aqueduc network Supply Water quality Consumption Consumption 2011-2012 problems Action Plan Question period

Units, conversion and abbreviations

Principal flow unit: L/min. (liters per minute) Secondary flow unit : USGPM (US gallons per minute) Volume unit: m³ (cubic meters) 1 m³ (cubic meter) = 1000 L (liters)

1 m³ (cubic meter) = 1000 L (liters)

1 USGPM = 3,785 l/min. 1 liter = 0,258 US gals. MDDEFP: Ministère du Développement Durable, de

l’Environnement, Faune et des Parcs

MAMROT: Ministère des Affaires Municipales, Région et

Occupation du Territoire

Method used to obtain water

Artesian well Infiltation gallery

Artesian well:

Drilling into the ground where water flows spontaneously Aquifer: a geological formation that is sufficiently porous and/or

fractured or cracked and permeable containing an underground water table (natural replenishment)

Method used to obtain water

table (natural replenishment)

Infiltration gallery:

Filter pipe(perforated pipe)installed horizontally capturing

water from the underground water table using a pump

Method used to obtain water

Strainer Undisturbed soil Coarser sand 2 to 4 mm Silt backfill material Vent

Current aqueduc network

Bondville Reservoir

AQUEDUC NETWORK:

• Network
• 45,6km of pipes
• 1,583 residence
• 175 fire hydrants
• one blow-off
• 142 valves
• About 20% leakage = network considered

healthy according to MAMROT

• Totalproduction: 1,929 L/min.
• Production required: 2,750-3,000 L/min.

Spring Hill Reservoir Jolibourg well Bailey Sector:

• LB-4-99
• LB-1-97
• (Trial infiltration gallery)
• (Permanent infiltration gallery)
• Production required: 2,750-3,000 L/min.
• Deficit to be filled about 1,000 L/min.

Supply

Bailey Sector (Bolton West): 82,4% of total production

Bailey Sector

LB-4-99:

Built in1999 Draws groundwater in an aquifer at the level of the rocky

subterranean layer at a depth of 43.3 meters

Flow

LB-4-99 LB-1-97 Jolibourg

subterranean layer at a depth of 43.3 meters

Authorized at a flow rate of 1,134 L/min. Chlorinated and pumped to the Spring Hill reservoir Equipped with a magnetic flowmeter and a water-level

probe (lowering of groundwater)

58.7% of total production

Bailey Sector

Well LB-1-97

Built in 1997 to replace the Bailey 2 well Draws groundwater in an aquifer of sand and gravel at a

depth of 14.34 meters

Flow

LB-4-99 LB-1-97 Jolibourg

depth of 14.34 meters

Authorized at a flow rate of 455 L/min Chlorinated and pumped to the Spring Hill reservoir Equipped with a magnetic flowmeter and a water-level

probe (lowering of groundwater)

23.6% of total production

Bailey Sector

Trial infiltration gallery

Built in 2007 to replace the Bailey surface well, deemed too

vulnerable

Small-scale constrution in order to evaluate potentiel Small-scale constrution in order to evaluate potentiel Draws groundwater close to Coldbrook Stream at a depth

• f 3.5 meters using filter pipes (perforted pipes) installed

horizontally

Potentiel flow of 280 L/min. Equipped with a magnetic flowmeter Operated between November 2009 and August 2012 No authorization from MDDEFP

Bailey Sector

Permanent infiltration gallery

Built in 2011 to increase the capacity of the small gallery The large infiltration gallery draws groundwater in the same way as the

trial infiltration gallery but at a depth of 6 meters

Flow about 665 L/min. Manganese concentration of 0.5 mg/L is above the esthetic standard of

0.05 mg/L (no danger for health) 0.05 mg/L (no danger for health)

Treatment possible but expensive:

Green sand filter: $200 000 + installation and building

Capacity for manganese dilution with the other wells: 0.136 mg/L An increase in the inflow from Coldbrook Stream could possibly reduce

the mangenese concentration: repair breach in dam and dredging

Use of large infiltration gallery has the effect of drying up the trial

infiltration gallery: 665-280= 385 (a gain of 385 L/min.)

This source could be used with caution in the case of periods of high

consumption, low supply or major fire.

No authorization form MDDEFP

Manganese

Permanent infiltration gallery

No danger to health Unstable in water and precipitates and produces sediment

in the form of black silt

Water has bad taste Water has bad taste May leave spots on laundry and plumbing accessories Sticks to conduit walls, reduces flow and can become

detached with turbulence

Presence of manganese in low amounts at several locations

in the network

Jolibourg Well

Built in 1991 Draws groundwater, in an aquifer of sand and gravel

at a depth of 42 meters

Rehabilitated in 1997 Pumps water directly in the network

Flow

LB-4-99 LB-1-97 Jolibourg

Pumps water directly in the network Current flow of 340 L/min. (authorized at 770 L/min.

in 1992)

Building redone in 2009 with a chlorination unit, not

connected (cause = time in contact with chlorine insufficient)

Not measured since the work (2009) Non-chlorinated 17.6% of production

Spring Hill Reservoir

Built in 1974 (useful life about 50 years = 2024) Material: Concrete Capacity of 4,546 m³ Capacity of 4,546 m³ Stand-alone capacity (±1500 L/min.) of 48 hours and a stand-

alone at maximum flow (±3000 L/min.) of 24 hours

Supplied by a 300 mm PVC conduit (autumn 2007) from the

Bailey sector wells:

LB-4-99 LB-1-97 (Trial infiltation gallery) (Permanent infiltration gallery)

Bondville Reservoir

Built in 1974 (useful life about 50 years = 2024) Material: Concrete Capacity of 227m³ Supplied by the Spring Hill reservoir (by gravity): Peak of 1000 L/min. when recharging

Peak of 1000 L/min. when recharging

Buffer reservoir used to supply the Inverness sector (about 130

residences) and to adjust the chlorine concentration when needed (standard: 0.3gm/L).

New chlorination station (not operating) One flowmeter at the entry and one at the exit (not connected) Equipped with a modulating valve Stand-alone about 13 hours (at 355 L/min.)

Instrumentation and controls

22 water meters already installed and measured every

month.

Flowmeters installed:

Spring Hill reservoir (1984) Spring Hill reservoir (1984) Bondville reservoir (two not connected) Well LB-4-99 Well LB-1-97.

Computer and software recording data installed in the

Bailey sector building.

Water Quality

Sampling performed according to the regulations in effect

and by certified personnel

No contamination problems in wells or in the network Monitoring of results handled by the SM laboratory of Monitoring of results handled by the SM laboratory of

Sherbrooke and controlled by the MDDEFP

Water of quality requiring minimal treatment

Consumption

26%

2011

6% 68% LEK Duck Farm Other consumers

Consumption

Knowton Packaging water consumption

Knowlton Packaging 2012 Reduction of 18% compared to 2011 to 2011

2011: 1,828 m³ of water at a cost of $23,619 were delivered

between July 21 and 23

2012: June 20 to 23, July 25 to 26, August 1 to3, August 20 to 23,

august 29 to 31

12,298 m³ (533L/min.) of water at a cost of about $150,000 before Jolibourg

well and the trial infiltration gallery were suspended until official authorization was obtained (demand estimated at 2,742L/min.) authorization was obtained (demand estimated at 2,742L/min.)

September 20: official authorization from the MDDEFP to operate

the Jolibourg well (acquired right since 1991)

2012: September 3 to 7, September 10 to14, September 18 to 21,

September 25 to 27 for a total of about 13,410,5 m³

In total 25,708.5 m³ of water at a cost of about $300,000

Increase in water needs since 2009 Closing of the trial infiltration gallery since we did not

have authorization to operate it

Weather favouring water consumption even though

there were water restrictions (pools, gardens, lawns, etc.) there were water restrictions (pools, gardens, lawns, etc.)

No reduction in production capacity No possibility of increasing production or of using

another source under penalty fines

Proposed action plan

Meet with the MDDEFP to review the situation and present our plan - Completed Determine the least expensive and most effective solutions- Completed Respond to the request for conformity from the MDDEFP (letter of May 17, 2012) Combine several requests for authorization from the MDDEFP based on the

recommandations of expert consultants:

Increase the production capacity of Well LB-4-99 to 1,300 l/min., an increase of Increase the production capacity of Well LB-4-99 to 1,300 l/min., an increase of

166l/min. – in progress

Provide the hydrogeological study to obtain authorization to operate the trial

infiltration gallery, for a increase of 280 l/min. – in progress

Provide the hydrogeological study ot obtain the authorization to operate the

permanent infiltration gallery for an increase of 385 l/min. – in progress

Study the possibility of operating the Jolibourg well at its full potential (pumping

trial), for a possible increase of 430 l/min.– to be determined

Balance the modulating valve of the Bondville resrvoir – to come Search for groundwater in early 2013 – to be determined

Reduction in Knowlton Packaging cooling water

consumption: reduction of 212 L/min. – in progress

Leak detection programme (2013 budget) Updating of intervention plan (2013 budget) Implement the water conservation strategy:

Proposed action plan

Implement the water conservation strategy:

Awareness campaign Barrels of capturing gray water at reasonable prices Sale of reduced water consumption kits (faucet, toilet,

shower head,etc.)

Complete the installation of instrumentation and controls

needed to enable us to better monitor facilities:

Connection of the new flowmeter at Jolibourg – in progress Connection of the equipment and the chlorination station

Proposed action plan

Connection of the equipment and the chlorination station

at the Bondville reservoir – to come

Replacement of the flowmeter at the Spring Hill reservoir

(1984) – to come

Modifications to the software programming to produce

more complete reports – to come

Protect the Bailey sector from the operating activities of

sand and gravel pits (DJL and Roch Vallières inc.)

Make operators aware of the risks of contamination Encourage the operators to implement measures to allow a

Proposed action plan

Encourage the operators to implement measures to allow a

reduction of risk (recovery of leaks from the machinery)

Scenario 1 (normal consumption):

Source Flow (L/min.) LB-4-99 1,300 LB-1-97 455 Trial infiltration gallery 280 Permanent infiltration gallery Jolibourg 340 Knowlton Packaging reduction 212

Proposed action plan

Scenario 2 (Peak consumption):

Total: 2,587 Source Flow (L/min.) LB-4-99 1,300 LB-1-97 455 Trial infiltration gallery Permanent infiltration gallery 665 Jolibourg 340 Knowlton Packaging reduction 212 Total: 2,972

Scenario 3 (full potential):

Source Flow (L/min.) LB-4-99 1,300 LB-1-97 455 Trial infiltration gallery Permanent infiltration gallery 665 Jolibourg 770 Knowlton Packaging reduction 212

Proposed action plan

Total: 3,402

End of presentation

Question period