FLOODWAY EXPANSION GROUNDWATER ACTION RESPONSE PLAN

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FLOODWAY EXPANSION GROUNDWATER ACTION RESPONSE
PLAN

• 1. OVERVIEW
• GROUNDWATER IS A TOP PRIORITY
• DESIGN IS TO WIDEN THE CHANNEL NOT DEEPEN,
  TO MINIMIZE ANY GROUNDWATER
  IMPACTS
• MONITORING IS ONGOING ALONG CHANNEL
• CARBONATE BEDROCK AQUIFER
• GROUNDWATER CONFINED BY OVERLYING CLAY
• WATER LEVEL PRESSURE IN BEDROCK ABOVE CHANNEL
  BOTTOM

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• 2. CONSTRUCTION REQUIREMENTS
• TEMPORARILY LOWER OR DRAWDOWN WATER LEVEL LOCALLY
  TO INSTALL BRIDGE FOUNDATIONS
• TO FACILITATE CONSTRUCTION, WATER MUST BE REMOVED
  FROM THE EXCAVATIONS
• 3. REASON FOR TEMPORARY DRAWDOWN
• TO PREVENT GROUNDWATER SEEPAGE INTO THE EXCAVATION

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• 4. EXPECTED IMPACTS
• GROUNDWATER DRAWDOWN WORK IS ANTICIPATED FOR
  APPROXIMATELY 2 TO 3 MONTHS, STARTING IN
  NOVEMBER, 2005
  AND IN FALL, 2006 (HWY. BRIDGE
  59S).
• LOCAL DRAWDOWN FOR CENTRAL BRIDGE PILES WILL
  EXTEND OUTWARD BEYOND BRIDGE.
• TEMPORARY DRAWDOWN ESTIMATED TO BE 1.5 M OR LESS
  AT CLOSEST DOMESTIC WELLS.
• MOST SUBMERSIBLE PUMPS SET WELL BELOW OPERATING
  LEVEL FOR DRY SEASONS, AND CAN HANDLE 1.5 M
  ADDITIONAL DRAWDOWN.
• SLIGHT RISK FOR A FEW PUMPS TO GO TEMPORARILY DRY
  - MFA TO MITIGATE.

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• 5. MITIGATION OPTIONS
• MFA MAY DELIVER POTABLE WATER
• MFA MAY LOWER RESIDENTS PUMP DEPTH
• MFA MAY MODIFY CONSTRUCTION PROCEDURES
• OTHER (SUGGESTIONS FROM THE PUBLIC?)

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GROUNDWATER ACTION RESPONSE PLAN

• RESIDENT ACTION
• COMPLAINT RECEIVED BY MFA FROM RESIDENT ADJACENT
  TO PROJECT DRAWDOWN ACTIVITIES
• MFA CONTACT
• Toll Free Telephone [phone]

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• PROPOSED MFA ACTION
• 1. PRELIMINARY SCREENING
• DISCUSS WITH RESIDENT WITHIN 1 HOUR OF COMPLAINT
  RECEIPT
• INTERFERENCE MAY HAVE OCCURRED
• MFA Provides Potable Water
• Determine Action Plan

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• PROPOSED RESPONSE PROCEDURES
• 2. SECONDARY WELL ASSESSMENT
• MFA ONSITE TIMELY ASSESSMENT AS ARRANGED WITH
  RESIDENT
• 3. MFA POSSIBLE MITIGATION ACTIONS
• CONTINUE WATER DELIVERY
• LOWER OWNERS PUMP
• MODIFY PROJECT PUMPING AND DRAWDOWN
• OTHER (SUGGESTIONS FROM THE PUBLIC?)

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• 4. PROPOSED DOCUMENTATION NOTIFICATION
• PREPARE INCIDENT REPORT FOR REGULATORS
• LOCATION OF COMPLAINT
• INVESTIGATIONS AND RESULTS
• ACTIONS TAKEN
• MFA WILL NOTIFY MANITOBA WATER STEWARDSHIP (MWS),
  WATER LICENSING BRANCH, MANITOBA CONSERVATION AND
  FEDERAL RESPONSIBLE AUTHORITIES (PHONE AND
  E-MAIL)
• MFA WILL SUBMIT INCIDENT REPORT TO MWS
  WITHIN 1 WEEK OF ASSESSMENT

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• 5. ONGOING PLAN IMPROVEMENTS
• GROUNDWATER ACTION PLAN WILL BE AMENDED TO
  IMPROVE RESPONSE AS REQUIRED.