Updates from Dec. 15, 2011 to Oct. 31, 2016.

 


Storm sewer lining begins

I am providing the City’s latest update on the current Lisgar Implementation project which includes lining select storm sewers and dewatering of the utility trench.

Storm Sewer Lining

map of phase 1 storm sewer lining

Pipeflo Contracting has contracted with the City to complete the sewer lining works for the Phase 1 Area (please see right). They have completed their measurements and ordered the lining material as of October 7. Pipeflo has confirmed that the liners are being shipped October 28th, with an expected delivery date of two to three weeks. Pipeflo will therefore be initiating the pipe cleaning and preparation activities in early November in anticipation of beginning the liner installation in mid November. The City’s Consultant, AMEC Foster Wheeler, will have an inspector on site full time.

The City has prepared a Notice of Commencement letter and intends to mail this letter to all residents within the Phase 1 area.

Dewatering of the Utility Trench

Our consultant is proceeding with a preliminary design for the utility trench dewatering system, scheduled to be constructed next year.

Monitoring activities continue as planned through 2016 to support storm sewer lining works and dewatering of the utility trench. Further, the High Water Protocol remains in-place through 2016.

Posted October 31, 2016


Update on flood mitigation work

I am pleased to provide an update on the current Lisgar Implementation project which aims to prevent further flooding in the Lisgar District.

Dewatering of the Utility Trench
This past spring, pre-engineering work was completed to identify the location of utilities in the area of Black Walnut Trail and Cactus Gate. This work included minor earthworks, surveying and site restoration within parts of the park block and road right-of-way in the vicinity of the intersection. A geotechnical investigation that will include some borehole sampling in this area is planned for 2016.

The results from this pre-engineering work will aid in the development of a preliminary design for the pilot utility trench dewatering system.

Storm Sewer Lining
The first stage of the procurement process was successfully completed this past spring and included selecting an appropriate technology for lining of the storm sewers. The technology selected to best suit the projects needs was Ultraviolet (UV) Cured-In-Place-Pipe (CIPP) technology. Currently, the City is in the next stage of procurement to retain a qualified company to implement the lining work using this technology.

We anticipate storm sewer lining work to begin this September with plans to be developed to mitigate impacts to school areas, pedestrians and traffic. The image above shows the general areas (Black Walnut, Terragar, Smoke Tree) where the initial storm sewers will undergo this lining treatment. Further details of the work will be shared once a lining company has been retained and an approved work plan has been completed. In support of this upcoming lining work, the City recently completed flushing and closed circuit television (CCTV) inspections of these storm sewers.

Monitoring activities continue as planned through 2016 to support storm sewer lining works and dewatering of the utility trench. Further, the High Water Protocol remains in place.

Posted July 20, 2016


Class Action Law Suit Dropped

Earlier this year, the final report investigating the cause or causes of the basement water infiltration in some dwellings in the Lisgar area was submitted to the City with recommendations to address the concern. Based on the thoroughness of the consultant’s report demonstrating an absence of evidence of any negligence on the part of the City, the class action lawsuit filed against the City has been withdrawn. The $200 million suit was filed a few years ago by a local resident on behalf of all property owners in the Lisgar District but was never certified by a judge.

I am grateful to all those who worked so diligently on the report and to staff who made the extra efforts to prevent further water infiltration during the investigation. Many thanks especially to the affected residents who, despite the anxiety that came with every rainstorm and snow melt, demonstrated such patience throughout the years of this study. I am confident that the recommendations put forward earlier this year and already being acted upon will have a positive outcome for the whole community.

Posted Aug. 28, 2015


Councillors Approve Recommendations and Expand Sump Pump Subsidy

I am happy to let you know that the Foundation Drain Collector (FDC) Sump Pump Subsidy Program’s webpage, including application form and additional program details and eligibility information, are now available for interested homeowners at the following link: http://www.mississauga.ca/portal/stormwater/fdc-sump-pump-subsidy.

This program replaces the previous Lisgar Sump Pump Subsidy Program. The new program is open to eligible homeowners that are located on a street serviced by the municipal Foundation Drain Collector (FDC) system, irrespective of any past occurrences of basement water infiltration.

To confirm if a property is located on a street serviced by the FDC system, homeowners are encouraged to call 3-1-1 or 905-615-4311 (if outside City limits), between 7 a.m. to 7 p.m. Monday to Friday. A figure showing approximate extents of the FDC system is available on the program’s webpage at the above link.

Residents with questions regarding the Foundation Drain Collector (FDC) Sump Pump Subsidy Program can call 3-1-1 to speak to a Customer Service Advisor or email stormwater@mississauga.ca.

Posted Aug. 14, 2015


Councillors Approve Recommendations and Expand Sump Pump Subsidy

Councillors have approved the series of recommendations presented by City staff at General Committee on April 8. Phase 1 of the implementation earmarks $3.9 million from the Capital Reserve Fund for use in 2015. This means preparations and work can begin this summer on the two highest priority actions in the Prioritized Action Plan which are 1) Sealing the inside surface of the storm sewers in strategic locations with an impermeable liner to reduce/eliminate leakage into the utility trench and ultimately into the FDC system, and 2) Dewatering the bedding material around the FDC system at strategic locations to limit the accumulation of water in the utility trench and provide additional storage volume during storm events.

A sixth recommendation was added to the report and approved by Councillors as well, broadening the eligibility of the Lisgar District Sump Pump Subsidy to include all residents in the City of Mississauga that are on the FDC system. All these recommendations need to be approved at Council on April 15.

This is a very positive development and I am grateful to all involved for getting to this point and that resources are now in place to begin addressing a long-term solution. Thanks again to all of you who have continued to show great patience throughout the investigation.

Posted Apr. 9, 2015


Recommendations to begin Addressing Flooding Issues

Councillors will be asked to approve the following series of recommendations at General Committee on Wed., April 8, 9 a.m. at City Hall:

  1. That the Prioritized Action Plan from the Lisgar District Basement Water Infiltration Investigation- Summary Report (March 2015) as outlined in the report dated March 27,2015, from the Commissioner of Transportation and Works titled Lisgar District Basement Water Infiltration Study Findings and Single Source Contract Award to Amec Foster Wheeler Environment & Infrastructure, File Ref Procurement No. FA.49.301-15 (Ward 10) be endorsed.
  2. That PN 15-146 Lisgar District Implementation Projects- Phase 1 be established with a gross and net budget of $3.9 million.
  3. That a by-law be enacted to fund PN 15-146 Lisgar District Implementation Projects- Phase 1 with $3.9 million from the Capital Reserve Fund (Account 33121).
  4. That the Purchasing Agent be authorized to execute the appropriate forms of commitment to Amec Foster Wheeler Environment & Infrastructure in the estimated amount of $600,000 for the design, monitoring, contract administration and construction inspection services in support of the Lisgar District Implementation Projects -Phase 1.
  5. That a copy of the report dated March 27, 2015, from the Commissioner of Transportation and Works titled Lisgar District Basement Water Infiltration Study Findings and Single Source Contract Award to Amec Foster Wheeler Environment & Infrastructure, File Ref Procurement No. FA.49.301-15 (Ward 10) be forwarded to Conservation Halton for information.

To see the entire Corporate Report, please click on this link:
http://www7.mississauga.ca/documents/agendas/committees/general/2015/04_08_2015_GC_Agenda.pdf   (Item #1)

Posted Apr. 4, 2015


Video of Meeting Now Available

A videorecording of the Community Meeting has now been uploaded to the City’s webpage. Follow this link to access the linke to the video as well as the other presentation slides and summary report.

Posted Apr. 4, 2015


Materials Available on Final Report

A presentation on the final report for the investigation into the basement water infiltarion in Lisgar was made at a community meeting on March 26. Follow this link to access the presentation slides and summary report on the City’s web page.

A corporate report with staff recommendations will go to General Committee on April 8, 2015 (9 a.m. in the Council Chambers).

Posted Mar. 27, 2015


Public Meeting to Present Final Report Confirmed

The final report on the Lisgar District Basement Infiltration Investigation is being finalized and should be ready in the coming weeks. In light of that, I have booked a date and venue to hold a public meeting where residents will be briefed on the findings and recommendations prior to a Corporate Report going to Council in the spring.

Details:

Thursday, March 26, 2015 at 7 p.m. (doors open at 6:30 p.m.)
St. Simon Stock Catholic School – 6440 Lisgar Drive

I anticipate that city staff from Transportation & Works, Risk Management and Legal Services, the consultant AMEC, the external lawyer, and Mayor Crombie will be in attendance with me. I invite and encourage all interested and affected residents to join us as well.

Kindest regards,
Sue


Presentation Materials from Community Update Meeting

The City and Consultant have posted the study update and presentation materials from the June 17 public meeting on the City’s web page. Please click this link to access these materials.


Community Update Meeting and Materials: June 17, 2014

I am hosting another community meeting where staff and the consultant will provide an update on the the basement flooding investigation. The update will include recent activities, latest findings so far, and remaining work to be completed. There will also be a time for questions and comments from the community.

Details:

Tuesday, June 17, 2014 at 7 p.m. (doors open at 6:30 p.m.)
Garry W. Morden Fire Training Centre – 7535 Ninth Line (north of the railroad tracks)

brief update document has been prepared by the consultant and city staff to give some context to the presentation in advance of the meeting. Please review this and come with any questions you might have and to hear a more fulsome explanation of the status to date. I hope to see you on the 17th.

Kindest regards,
Sue


Lisgar Flood Study Report Update: May 29, 2014

I have some good news and some not-so-good news to share regarding the investigation into the flooding occurrences in the Lisgar District. The good news is that Phase II of the study is complete and additional monitoring and analysis have produced some notable findings. The not-so-good news is that the overall study is not complete and a third Phase is required to further analyze some of the new discoveries in Phase II as well as bring forward recommendations for improvements to the drainage system.

Yesterday, I met with staff from Transportation & Works, Risk Management, Legal Services and the consultant AMEC for a briefing of the latest findings in the study. Even though the overall project is not complete, I insisted that a community meeting be scheduled to give affected residents the opportunity to hear this update first-hand. You’ve waited a long time (and you’ll be asked to wait a little longer for the final report) so providing this update now is a critical part of my commitment to communicating openly and regularly with you on this very important matter.

Please mark Tuesday evening, June 17 in your calendar for this community meeting. Staff and the consultant are available that night and I will confirm the date, time and location once a venue has been secured. T&W staff are preparing a letter and update summary document of the Phase II part of the study that will be made available to you in advance of the meeting.

I hope you can make it out on the 17th.

Kindest regards,
Sue


Lisgar Flood Study Report Update: May 13, 2014

No doubt you are anxious to hear any news about the results of the consultant’s study regarding the flooding in the Lisgar District. I am too. It’s been a long time coming and I thank you for the patience you have demonstrated. I want to reassure you that I have been continually requesting updates from the staff lead on this project, as the report has been delayed and is now long overdue. A few weeks ago, I was informed that the report is complete and I have just recently been able to schedule a meeting at the end of this month with the Mayor, City Works staff and legal representatives for a briefing on a summary of the findings. I will be requesting that a public meeting be held to provide an opportunity for the community to hear the results and recommendations first hand and to ask questions directly to staff and the consultant.

In the meantime, the City continues to monitor the creek, pond and storm water levels during high water warnings as a preventative measure and, thankfully, there have been no further reported incidences of flooding or leaks in the area. As well, I have put forward a Site Control Bylaw on developable lands in the Lisgar area to ensure that any further development does not negatively impact the storm water system for current and future residents.

I plan to provide another update to you in early June.

Kindest regards,
Sue


Lisgar Flooding and Sump Pump Q&A : October 31, 2013

In recent dialogue with some Lisgar residents, I have posed a series of questions to City of Mississauga staff in the Transportation and Works department and have been provided with the following response. Of particular note is that the consultant performing the engineering study is expected to provide the next set of findings to staff in December and our office would be briefed on the report in January.  As soon as I have the information, I will pass it along to you, the affected residents in Lisgar, and soon thereafter I will set up another public meeting where, together, we can address the matter and move toward a resolution. I look forward, as I’m sure you do as well, to getting answers and implementing solutions.

Kindest regards,
Sue

1.     Should a resident decide to install a sump pump and it becomes necessary for the pump to extract water from a flooded basement, where does the water get pumped to?  Storm water sewers? Via the roadway? How does this function exactly? Please be as specific as possible. 

To clarify, the sump pump is not intended to pump out a flooded basement but rather intended to pump water collected from the foundation drain onto grass surface of the homeowner’s lot.  As each residential property varies in terms of grading and landscaping, it is the homeowner’s responsibility to find a suitable point of discharge on their property.

2.     How did the City derive its $6,000 value on the installation of a sump pump?

The estimated maximum sump pump unit cost of $6,000 was based on similar municipal government subsidy programs for sump pump installations. This sump pump unit cost was also applied to the Rebate Program for Cooksville Creek as part of the Flooding Remediation and Action Plan with the $6,000 value being supported by reported sump pump installation costs as part of this program.

3.     Is the City able to provide the residents with a list of certified and eligible contractors that are a) able to install a sump pump and/or b) able do this work for $6,000, including tax?

The City is not able to provide residents with a list of contractors. Residents should investigate the available contractors and obtain confirmation directly from the contractor that they have a valid licence and that they are eligible to perform the work.

4.     It is our understanding that the High Water Protocol is a temporary measure put in place to mitigate further flooding during the ongoing investigation. Is it possible for the City to install an automated pumping solution on a more permanent basis to reduce the level of water in the Foundation Drain Collectors at strategic locations in the Lisgar District?

The City is investigating permanent automated pumping requirements to manage the observed FDC flows. As ample monitoring data is necessary to evaluate this option, the practicality of permanent automated pumping of the FDC will be assessed after the current monitoring phase for the Lisgar basement water infiltration investigation has been completed.

5.     When do you expect the next study report from the engineering consultant to be completed?

The engineering consultant that is currently investigating to determine the direct cause(s) of basement water infiltration in the Lisgar community is anticipating in-field monitoring to be completed at the end of November as part of this phase of work. The City anticipates receiving study findings from the consultant in December. Once City staff has completed its assessment of consultant’s findings, staff will provide the next update to the Councillor’s office regarding the study.


Lisgar Sump Pump Subsidy Program Update : October 23, 2013

I have been in contact with Martin Powell, commissioner of Transportation and Works with the City of Mississauga, about an error that was part of the Terms and Conditions of the Sump Pump Subsidy Program launched last week. Item number 24 indicated that there was a limited amount of funding available and the reimbursement would be issued on a first come, first served basis. This is not the case. There is no maximum on the available subsidy and therefore no rush to get your sump pump installed in order to beat your neighbours in the queue.

As of October 24, the Terms and Conditions have been altered to reflect this correction.

Kindest regards,
Sue


Lisgar Sump Pump Subsidy Program : October 17, 2013

The City of Mississauga has established the Lisgar Sump Pump Subsidy Program and applications will be accepted starting Friday, October 18.

An application form along with additional program details and eligibility information is available on the City’s website for affected homeowners. A webpage has been developed specifically for the Lisgar Sump Pump Subsidy Program at the following link:

www.mississauga.ca/portal/residents/lisgarsubsidy

Residents who have reported basement water infiltration to the City, by either completing a flooding questionnaire or filing a claim, will receive notification of the program through a letter mailed to their home.

Once an application has been received and processed by City staff, the resident will be notified by mail if their application has been approved. The letter will indicate application approval and reimbursement will be provided under separate cover.

To assist residents in making a well-informed decision on installing a sump pump, we recommend that affected residents refer to the ‘Handbook for Reducing Basement Flooding’ by the Institute for Catastrophic Loss Reduction (ICLR) which can be found at the following link:

www.iclr.org/images/Basement_Flood_Handbook_-_ICLR_-_2009.pdf

Any residents with questions regarding the Lisgar Sump Pump Subsidy Program are asked to call 311 to speak to a Customer Service Advisor or email water.info@mississauga.ca.


Lisgar District Flood Update : July 11, 2013

The City of Mississauga will be conducting a sewer smoke testing program in the Lisgar District between July 15 and July 26, 2013.  Smoke testing is an easy way for the City to test the foundation drain collector sewer system, and to potentially locate any deficiencies in the system. Residents are not required to be home for the smoke testing.

What is smoke testing? 

The smoke test consists of blowing vapour into the sewer manholes and pipes and observing where the smoke exists the system. The smoke is expected to exit out of manholes on the street, and along the perimeter of residences. 

The smoke used in the test has no odour and will disappear after a few minutes. 

Residents whose homes are affected by the testing have been sent a notice delivered directly to their homes.


Lisgar District Flood Update : July 5, 2013

I have posed a series of questions to our Transportation and Works staff and external consultant regarding the recent monitoring activities with respect to the flooding in our area.  The good news is that we have had plenty of rainfall over the last few weeks to gather data; the even better news is that there has been no further reports of flooding!

Unless there is some kind of emergency, I anticipate that the next update will come in the fall with further findings from the consultant’s ongoing study. Of course, I will continue monitoring the situation throughout the summer in case there are any unforeseen developments.

Also, as previously announced, Council approved the Sump Pump Subsidy – 50% of the cost up to $3,000 – and this past Wednesday, delegated authority to T&W staff to establish the program and execute agreements. The subsidy will be retroactive, provided that home owners had their pump installed after Jan. 1, 2008 and after having filed a claim with Risk Management, in addition to some other criteria. Further information on the subsidy will be provided once the program is set up and running sometime this fall.

Some of the information below is somewhat technical in nature; I trust you will be able to glean from it what is useful to you.

Kindest regards,
Sue

————–

Dear Councillor McFadden, 

Thank you for the email from your office dated June 12, 2013, requesting an update regarding the Lisgar basement water infiltration investigation. The specific questions outlined in the email are listed below in italics, with our responses provided beneath.

1.     What new monitoring activities have taken place by AMEC since April 16, 2013?

The following monitoring activities have been completed by AMEC since April 16, 2013:

  • Installation of new surface water gauges
  • Re-installation of previous (2012) surface water gauges (with the exception of GO Channel gauge)
  • Re-installation of rain gauge
  • Installation of additional FDC and storm sewer monitoring gauges
  • Installation of additional groundwater monitors\piezometers
  • Ongoing downloads of existing FDC and storm sewer monitors and groundwater piezometers
  • Review of sanitary sewer monitoring data as provided by the Region of Peel

The following monitoring activities are still to be completed:

  • Relocation of 3 of the existing FDC gauges
  • Additional piezometers and FDC\storm gauges
  • FDC/Storm sewer leakage/infiltration test

2.     How many new gauges have been installed? Where have these gauges been installed? What is the total number of gauges currently being used by AMEC to monitor water levels as part of this study?

Total new water level gauges – 12, with a further 6 to come

New FDC Gauges (3)

  • Background gauge on McDowell Drive (installed May 2013)
  • Along FDC trunk on Ninth Line south of Thomas Street (installed June 20)
  • Along FDC trunk on Erin Centre Boulevard (installed June 20)

New Storm Sewer Gauges (2)

  • Alderwood Trail
  • Churchill Meadows Blvd (installed June 20)

New Surface Water Gauges (3)

  • Lisgar Channel (16 Mile Creek Tributary) at Alderwood Trail
  • Osprey Marsh SWM Facility
  • 16 Mile Creek Tributary downstream of Osprey Marsh SWM Facility

New Groundwater Monitors (4)

  • Alderwood Trail

Pending additional Monitors – dependent on selection of secondary site (6)

  • Additional piezometers (4)
  • Additional FDC and Storm Sewer monitors (1 each)

Total number of water level gauges and groundwater gauges in place – 38 (doesn’t include the pending monitors for secondary monitoring site)

12 Previous FDC Gauges, 3 additional FDC gauges = 15

1 Previous Storm Sewer Gauge, 2 new storm sewer gauges = 3

3 repeat surface water gauges (1 from 2012 not reinstalled), 3 new surface water gauges = 6

10 repeat groundwater monitors (6 From 2012 decommissioned), 4 new groundwater monitors = 14

3.     Martin Powell made public mention of the FDC surcharging south of Britannia. Recognizing that findings may be preliminary at this time, please provide some additional comments as to what has been discovered, including where.

During the rainstorm on April 10th-12th, 2013, higher than expected water levels were observed in the FDC trunk sewer on Ninth Line south of Britannia Road.  To better understand the operation and performance of the FDC system in this area, additional monitoring devices have been deployed by AMEC as the basement water infiltration investigation continues.     [It is my understanding that this FDC trunk is located in the Ninth Line corridor on the west side of Ninth Line.–Sue]

4.     With the significant amount of rainfall so far this Spring, how many times has the High Water Protocol been enacted and, was there any time where water needed to be pumped out of the FDC?

The High Water Protocol has not been enacted since the rainfall events of April 10-12, 2013. During this 3-day period, the pumping equipment was operational and pumping water from the FDC on six (6) separate occasions. These locations included Osprey Boulevard, Black Walnut Trail, and Ninth Line. The pumps were running for approximately 10% of the total time they were deployed in the community from April 10-12, 2013.

5.     Have City staff made any changes/refinements to how/when the HWP is invoked?

Since our last response letter dated May 16, 2013, there have been no further changes/refinements to the High Water Protocol.

6.     In light of Number 3 above, are there now additional High Water Protocol locations being considered where staff will be on stand-by to monitor water levels in the FDC?

As the High Water Protocol is mobile, City staff and the necessary pumping equipment can be relocated to different locations on an as-needed basis, including the FDC trunk south of Britannia Road.  

7.     Has the City engaged the services of a Field Adjuster/Inspector yet? If not, when will this begin? If so, how many homes have been inspected to date?  The last update from Martin indicated that “additional details of this work, including dates/times of property visits, will be provided when this information becomes available.”  Is this still the intention?

The Risk Management Section has engaged the services of an independent Claims Adjuster. Ken Gibson, of Sterling Adjusters, will only be contacting residents of the Lisgar Area that have filed an insurance claim with the Risk Management Section.  The Adjuster will arrange a meeting and visit to each residence to obtain details of their specific claim; visual inspection, determine type and amount of damage, determine how water entered their home, etc.  The initial contact calls will commence the week of June 17, 2013.

We currently have a list of approximately 60 homes in the Lisgar area.  This listing excludes any residents who have issued a Statement of Claim against the City or who are represented by legal counsel.

As previously indicated, we continue our efforts to determine the source(s) of basement water infiltration in the Lisgar community.

Yours truly,
Jeremy Blair, P.Eng.


 

Sump Pump Subsidy Update II: June 19, 2013

Hello Lisgar residents,

A quick update following today’s Council Meeting…

The corporate report as presented by staff was approved with an amendment. In summary, all residents who have been affected by flooding in the Lisgar District and who decide to install a sump pump in their basement, will receive from the City of Mississauga 50% of the cost of the pump and installation up to a maximum of $3,000. This will not be restricted to the early bird residents that may apply on a first come, first served basis, as was highlighted in the original report; it will be available to all affected residents. The program will need to be set up over the coming weeks and I will provide a notification to you when residents can apply for the subsidy.

There was some discussion as to why Lisgar residents were receiving 50% subsidy when flooded residents in Cooksville recently received two-thirds coverage for sump pumps (three-way cost-sharing: 1/3 – city, 1/3 – region, 1/3 homeowner). Transportation & Works acting commissioner Joe Pitushka addressed this at Council today as well as sending this e-mail to Councillors prior to the meeting:

At the June 12, 2013 General Committee Meeting, there was discussion on providing equity with Cooksville with respect to the amount of sump pump subsidy proposed for the residents of Lisgar (i.e. 66% versus 50%).   I trust the following will help in clarifying the issue and provide rationale for staff’s recommendation:

In Cooksville, the purpose of the sump pump subsidy program was to assist homeowners in cases where the weeping tiles and sanitary drains were found to be interconnected and where the installation of a sump pump was recommended by the Household Drainage Survey in order to permit the installation of a sanitary backwater valve.  The interconnection between the weeping tile and the sanitary drain was permitted during the time certain homes in Cooksville were built but is now prohibited under the Region’s Sanitary Sewer Use By-law.  While it is the homeowners’ responsibility to rectify, given the joint interest between the City, Region and homeowner, a cost sharing formula of 1/3 : 1/3 : 1/3 was deemed reasonable in the Cooksville case.  The maximum subsidy provided was $2000 from the City and $2000 from the Region, based on the estimated average installation cost of $6000.  It is noteworthy that houses which were determined by the Household Drainage Survey to not have interconnected weeping tiles and sanitary drains were not eligible for the sump pump subsidy.

In the Lisgar District, homes were built based on a three-pipe system: dedicated foundation drain collector, storm and sanitary sewers.  Homes were built without an interconnection between the weeping tiles and sanitary drains and therefore a sump pump is generally not required to facilitate the installation of a sanitary backwater valve in a home.  Instead, the purpose of the proposed sump pump subsidy in the Lisgar District is to provide residents impacted by basement infiltration with financial support should they choose to install a sump pump as an additional safeguard for their home.  It is noted that the specific cause(s) of the basement infiltration occurrences have not yet been determined; it may be found that the installation of sump pumps will not be required as part of the solution or mitigation of the problem.  However, until such time, staff proposes that as a gesture of good will to the residents impacted by basement infiltration, a subsidy be offered which would reimburse 50% of the cost of a sump pump installation by a licensed plumber, up to a maximum of $3000, again based on the estimated average installation cost of $6000.

I also want to take this opportunity publicly thank Helen Ritchie and Suzanne Thistle for their deputations this morning at Council. Even though Council didn’t change the level of cost coverage on the subsidy, your presentations were important for the Councillors to hear. Thank you for taking the time to bring forward your concerns for yourselves and the larger community.

It is also important to note that this is not the final word on this matter by any means; it only an initial step in the journey toward a satisfactory resolution for all concerned.

Kindest regards,
Sue


Sump Pump Subsidy Update: June 13, 2013

FYI, the Sump Pump Subsidy item on the General Committee agenda (see post below) was referred without a recommendation to the June 19 Council meeting for further discussion (that is, no decision was made on this at the General Committee meeting). A link to the June 19 Council agenda will be posted here once it is available.


Sump Pump Subsidy Before Council: June 10, 2013

General Committee will discuss a Corporate Report on the Lisgar District Basement Water Infiltration Sump Pump Subsidy Program at its meeting on June 12, 2013 at 9:00 a.m. in the Council Chamber. (Due to the fact that this matter is tied to claims and compensation, and because I reside in the geographic boundary of the pending legal action against the City, I must declare a conflict of interest when this item is discussed.)

Link to the agenda


Response from Commissioner to April 18 memo: May 21, 2013

Dear Lisgar Residents,

Below is the response I received today from Transportation and Works commissioner Martin Powell to the memo I sent last month following our community meeting. City staff and the consultant have been meeting regularly since that meeting to go over their respective work plans for the next phase of the investigation and study.

The responses and explanations that follow are somewhat technical in nature and offer further in-depth insight into the function and processes that currently exist. I am pleased with some of the new initiatives that are being put in place and, even as I rely on the expertise of the city’s engineering team and the findings of the consultant to date, I will continue to pursue every avenue toward a solution to help protect you, your loved ones and your property.

I hope this information is helpful and, as always, if you have any questions, please feel free to write back.

Kindest regards,
Sue

Thank you for your email dated April 18, 2013, regarding priority items for the Lisgar basement water infiltration investigation. The priority items are listed below in italics, with our responses provided beneath.

1.     Investigating and taking any necessary steps to “undam” the waters at the southwest end of the Osprey Marsh near the Ninth Line overpass.

a.     This could include, as a start, cleaning and clearing debris and vegetation in the channel on the west side of Ninth Line;

It is important to understand the form and function of the Osprey Marsh Stormwater Management (SWM) Facility when discussing the potential for any further physical work in the area. This facility is classified as a “wet pond” and provides both water quality and water quantity control for the receiving watercourse system of Sixteen Mile Creek. Water quality control is achieved by the settling out of suspended solids in the pond, thereby lessening the amount of turbidity in the downstream receiving watercourse which protects aquatic life. Water quantity control is achieved by the detention of runoff from larger storm events which otherwise could contribute to erosion and flooding of the receiving watercourse system and could place infrastructure, property, or people at risk. The control weir/dam structure located upstream of the Ninth Line bridge is an essential part of the facility necessary to provide both water quality and quantity control functions.   

As part of the on-going investigation, the City’s consultant will be adding additional monitoring gauges in the Osprey Marsh SWM Facility and in the receiving watercourse downstream (tributary to the Sixteen Mile Creek). The purpose of this monitoring activity is to determine if the Osprey Marsh SWM Facility, its control weir/dam, or the receiving watercourse has any negative effect on the performance of the overall storm drainage system. Any further physical work in the area will be based on recommendations that result from the on-going engineering investigation. To date, the City does not have any evidence to suggest that the downstream creek is negatively impacting the Osprey Marsh SWM Facility or that the control weir of the facility is negatively impacting the upstream drainage system.    

Any physical work that may be recommended in the area would be subject to Conservation Halton approval, including any sediment and/or vegetation removal from within the channel corridor. Further, any proposed changes to the weir structure and facility design would be subject to approval from the Ministry of Environment.

It should be noted that natural and urban debris that is at-risk of creating a blockage is removed from this area, and throughout the entire Sixteen Mile Creek channel corridor, on a regular basis by City maintenance staff. The City will maintain this practice and urges residents to contact the City should they observe any debris in the corridor.

b.     Re-evaluating the use of rocks at the pond outlet structure.

The intended design and construction of the Osprey Marsh SWM Facility includes a rock-lined channel as part of the outlet structure to ensure the facility performs as intended. Previously, a number of rocks were manually dislodged from the channel banks and placed across the channel to form a makeshift pedestrian walkway. The City removed the walkway after confirming with Conservation Halton that no permits were required for this work. Despite the completion of this work, it is believed that the makeshift pedestrian walkway was not at-risk of creating a blockage of such magnitude as to alter the facility’s function.

As part of the on-going study, the City’s consultant will be investigating the facility, including the rock-lined channel at the pond outlet structure. Any further physical work to the Osprey Marsh SWM Facility will be based on recommendations that result from the on-going engineering investigation and would be subject to Conservation Halton and Ministry of Environment approval.  

2.     Expanding the scope of the consultant’s study to include interviewing the residents who have filed a claim for damages against the city to gain further insight in to how they were affected.

As an extension of our continued basement water infiltration investigation, the City will be utilizing the services of a Field Adjuster/Inspector who will contact and interview residents that have filed a claim with the City. The purpose of this work is to gather additional property-specific details regarding basement water infiltration and to assist the City and its consultant with determining the source(s) of basement water infiltration. The Adjuster/Inspector will also complete a visual inspection of the exterior of the home which may include taking photos where required. Additional details of this work, including dates/times of property visits, will be provided when this information becomes available.

3.     Lowering the threshold for when the High Water Protocol is invoked.

a.     That is to say, not waiting for a warning from Conservation Halton, but taking on the responsibility within the City to establish a threshold based on the investigative work done so far that takes into account ground saturation in combination with anticipated rainfall / snowmelt events.

To clarify, initiating the High Water Protocol is not strictly based on high water level warnings from Conservation Halton. The protocol can also be initiated based on field observations from City staff that takes into account several variables such as rainfall intensity, creek water levels, and foundation drain collector (FDC) water levels. As an example, the rainfall event during early April 2013 did not generate a high water level warning from Conservation Halton, however, field observations gathered from City staff initiated the High Water Protocol and mitigation measures were then put into action. The most practical way to initiate the High Water Protocol is to rely on the direction of on-site City staff in conjunction with consideration of high water level warnings from Conservation Halton which is the current practice. It should be noted that the High Water Protocol is continuously being refined by the City.

In the event the High Water Protocol is initiated, City staff may be on-site with pumps but may not necessarily be pumping depending on water levels observed in the FDC. In 2013 to-date, pumps have been running (based on observed water levels in the FDC) for approximately 5% of the total time they have been deployed in the community.

It is important to note that, despite the City’s best efforts, there is no guarantee that basement water infiltration will not occur when the City is operating the pumps.

The High Water Protocol is a temporary measure and not intended as a permanent long-term solution to address basement water infiltration in the area. The protocol is in-place until further recommendations are proposed based on the results of the on-going investigation.  

Martin Powell, P.Eng.
Commissioner, Transportation and Works
City of Mississauga

 


Community Meeting Follow-up: April 18, 2013

Hello Neighbours,

Thank you to everyone who was able to attend Tuesday night’s meeting at City Hall. Like you, I would have hoped for more answers than were available but, understandably, there was limited data from which to draw conclusions because of the unusually dry year in 2012. A path forward has been set out and, as I said at the meeting, I am committed to doing everything in my power to find a resolution to this matter as quickly as possible.

I have attached a letter that I sent to our Transportation & Works department outlining three key priorities that should be investigated in the near term. I will keep you updated as to when work begins and as findings are reported.

For those who weren’t able to attend the meeting, the presentation is now available online at:http://www.mississauga.ca/file/COM/Lisgar_April_16_2013_Presentation.pdf

I expect the copies of the DVD recording of the meeting to be available in the next 2 to 3 weeks and I will be sure to let you know when and how you can request a free copy if you would like one. If you have any questions or comments, please contact me anytime: 905-896-5010 or Sue.McFadden@mississauga.ca.

Kindest regards,
Sue


Basement Water Infiltration Investigation Presentation

The presentation slides from the Community Update meeting on Tuesday, April 16 have been posted on the City’s website and can be viewed here:
http://www.mississauga.ca/file/COM/Lisgar_April_16_2013_Presentation.pdf


Community Meeting Date and Location Set

Please make note of the following date, time and location for the Community Meeting on this issue. I am hosting this meeting with officials from the City of Mississauga, Region of Peel, Conservation Halton and the external consultant AMEC to discuss AMEC’s engineering study report related to the flooding in the Lisgar District. Affected residents are encouraged to attend to hear the presentation and ask questions, Tuesday, April 16, 7 p.m. in the Council Chamber at City Hall, 300 City Centre Drive. Doors open at 6:15 p.m. Free underground parking is available at City Hall after 6 p.m.


Activity update: Mar. 8, 2013

Dredging of the Sixteen Mile Creek is ongoing. The portion around the bridge near Osprey Boulevard was completed a few weeks ago, then dredging occurred near the pedestrian overpass and it is currently taking place at the Doug Leavens Boulevard bridge this week. This dredging is just one more in a long list of activities undertaken by the City and other agencies in our attempt to find a solution to the flooding problems that have affected many of you.

On that note, the consultant’s report has been submitted to the City’s legal staff. City and outside lawyers, along with members of the Transportation and Works department are reviewing the report. I look forward to being briefed on its contents in a few weeks’ time. Once the city’s review is complete, staff will put together a presentation which will be made available to the public at our Community Meeting in April.


Activity update: Feb. 28, 2013

Hello Lisgar Residents,

I wanted to send along a quick update to say that the dredging of the Osprey Pond and portions of the Sixteen Mile Creek began a few days ago and is ongoing, weather permitting. Also, please note that, as a preventative measure, the City’s High Water Protocol was implemented last night due to the significant snow/rain fall event. Crews were on standby to monitor the water levels in the drainage systems along the creek and pond and I understand no pumping of the foundation drain collectors was necessary.

Most importantly, I am currently trying to secure a date and location to hold a community meeting with you and all the other stakeholders (city, region, conservation, etc.) to discuss the external consultant’s report on the engineering study of the watershed and infrastructure in the Lisgar District.  The tentative date and location is Tuesday, April 9 at 7 p.m. I will send another notice when the details of the meeting, including location, are confirmed.

Thank you again for your patience. It remains my hope and goal that we will come to a fair and acceptable resolution to this matter very soon.

Kindest regards,
Sue


Activity update: Feb. 8, 2013

Toward the end of January, I posed a host of questions to the city’s Transportation and Works staff and am pleased to offer their response to the Lisgar residents:

Rocks in the Pond

Environmental Services staff sought approval from the Watershed Engineering Services section at Conservation Halton (CH) to remove the rock crossing that has been created across the channel through the berm.   On Friday, February 1st, staff received an email from CH with permission to remove the rocks (a formal permit will not be required).  The maintenance personnel will be directed to remove these rocks as soon as possible. City standard stormwater pond warning signs are also being prepared and will be installed this Friday, February 1st.

Observations made by Environmental Services staff during/after rainfall events suggest that the rock crossing is having a minor effect on the operation of the pond.  The concrete weir structure and the capacity of the downstream channel are primarily controlling the outflow from the pond, not the rocks.  However, staff would like to discourage people from crossing this channel for safety reasons and agree that it is important to remove the rocks and reinstate channel to its design condition.

The rock lined channel was constructed through the berm as part of the outlet configuration retrofit project that was completed last winter.  This retrofit improved upon the original design of the pond as it dramatically reduces the time that water is detained in the pond following rainfall events.  The detention time for a ½ inch (13 mm) storm was over 100 hours – much longer than it needed to be to fulfill its water quality and quantity control objectives.  It is now just over 50 hours.

West of Ninth Line

It is true that the channel west of Ninth Line restricts the flow of water out of the pond.  This is by design.  The pond is designed to detain water and release flows more slowly than the rate at which it enters the pond from the upstream creek.  The restrictive flow capacity of this channel is part of the outflow control design for the pond.  The flow capacity of the channel west of Ninth Line is controlled by the elevation of the Highway 407 creek that it discharges to and is nearly flat in gradient (<0.1%) over this reach, and therefore cannot be significantly improved.  The flatness of this channel has resulted in slow moving water and the tendency for sediments and vegetation to accumulate within it.  The engineering study which ultimately recommended last year’s pond outlet retrofit works concluded that this accumulation of sediments and vegetation will quickly re-appear if dredged out and therefore the pond outlet retrofit was designed based on the channel’s present condition.  The report went on to state that any benefit gained from dredging this channel would be modest and short-lived and that dredging is subject to rigorous regulatory approvals.

Staff continues to recommend against seeking approval to dredge the channel until the engineering study has been received.   City and Conservation Halton staff met on site February 5 to view the erosion and sediment controls and other site preparations for the dredging works, as well as to view the vegetation growth at the Ninth Line culvert.

Staff also reports that various articles of urban debris were removed from the channel west of Ninth Line after the January 13th event passed.  The debris removed from the pond outlet channel on January 15, 2013 primarily included wooden pallets, similar to what was found and removed on a previous occasion in September of last year.  Staff has a protocol in place that includes an inspection of the entire creek corridor from the Osprey Marsh to the CP Rail tracks, including all of the storm outlet channels draining to it, as well as the outlet structure of the Osprey Marsh pond, to identify and remove debris.  Crews are dispatched to conduct these investigations and debris clean-up following all rainfall and snow melt events.

Permits

The most recent permit from Conservation Halton was received on January 14, 2013.   The application for this permit was first submitted to CH on July 24, 2012.  The first set of comments was received on August 28, 2012.  Regular dialogue and several on-site meetings followed with CH staff to resolve issues such as construction access, disruption to the natural corridor, the protection of fish and fish habitat, and channel hydraulics.  Detailed topographical survey and mapping work was conducted, engineering drawings were prepared and consulting services were procured to assist with the fish protection activities during construction.  This type of effort is not uncommon for instream channel works such as this.

The work to dredge the creek by the Osprey Boulevard, Doug Leavens Boulevard and the pedestrian bridge crossings was originally scheduled to begin this week but weather and creek flow conditions have delayed the start of construction to next week (February 4).  The work is expected to take several weeks to substantially complete, with restoration works to the trail and natural corridor to follow in the spring/summer of this year.

With respect to the dredging of the storm outfall channels, ten have been dredged from Osprey Boulevard to just upstream of Doug Leavens Boulevard and three more will be dredged as part of the Doug Leavens and pedestrian bridge main channel dredging activities.

High Water Level Protocol

The High Water Level Protocol, which is invoked as soon as a High Water Bulletin is received from the conservation authority, includes the set-up of pumps in key locations to relieve flows from the FDC trunk sewer if required.  These locations include:  the west end of the Osprey Marsh pond, near Ninth Line; the east end of the pond, south of Osprey Boulevard; and near the Derry Road culvert over the creek.

Prior to the rainfall and snowmelt event at the end of January, the only time the High Water Level Protocol was engaged in the Lisgar community in the past 14 months was on October 29, 2012, during the rainstorms associated with Hurricane Sandy.  The protocol was engaged for a second time on January 29 of this year.

The Study

Staff has been advised that the consultant will complete their report by the second week of March.  The exact scope and cost of the study will not be known until the consultant’s report and any follow up efforts are finalized.  The final scope of work cannot be predicted until the initial investigation is completed and further, unanticipated investigations are carried out, such as the return of results from the January 13, 2013 storm event.

It is acknowledged that during the meeting with the Mayor, the Councillor and staff on January 22nd it was stated that the report was expected by the end of February.  Subsequently, staff was advised that the report would be submitted to City staff two weeks later on account of the need to incorporate an analysis of the most recent storm events. As such, in the email prepared for the Mayor’s office on January 25th it was stated that the AMEC’s report was due (to staff) in early March.  Staff has since been advised that this remains the expected time-line.

Next Steps

In addition to the on-going and planned actions detailed above, staff intends to continue with the smoke testing of the FDC sewer system in the Lisgar area, including Lisgar Drive between Doug Leavens Boulevard and Osprey Boulevard.  The test is highly dependent on dry and mild to warm weather conditions to be effective.  As such, staff will be scheduling smoke testing in June, or earlier if conditions permit.  The testing may continue into July.

Dye testing will continue once suitable weather is upon us, and is most likely to be completed in the early spring.  Dye testing notices will be hand delivered to affected residences days prior to the scheduled test date.  A follow-up test will be scheduled to address the homes that were unavailable on the original test date.

Finally, as noted the consultant’s report is expected to be received in early March.  Once staff has reviewed the report a date for the community meeting will be set in consultation with your office.

The current list of planned actions is in large part based on results from the various investigations that have taken place over the last 14 months or so, such as closed-circuit video inspections of the FDC sewer mains, previous rounds of smoke testing, field monitoring observations by the consultant, as well as concerns raised by residents in the community.  It is possible that the findings of the AMEC’s report may trigger the development of an additional list of investigations and/or actions to be undertaken by the City.


Letter and Update on Jan. 13 Rain Event: Jan. 22, 2013

As a result of the rain event and rapid melting that took place on Sunday, Jan. 13, seven homes were affected by water seepage in their basements. In response to this disappointing development, I have prepared the letter linked below to reassure the community that our office is working diligently to get answers to the many questions and concerns raised by homeowners. I have communicated directly with many individuals by e-mail, phone and face-to-face and have met multiple times with staff regarding what has taken place and the next steps moving forward. Check back to this space for continuing updates. If you live in the affected area, and would like my updates to come directly to your Inbox, please send me an e-mail at Sue.McFadden@mississauga.ca. Thank you again for the patience you are demonstrating as we continue to work toward a suitable and sustainable solution.

Councillor’s Letter


Memorandum from Transportation & Works: Dec. 3, 2012

Memo from Joe Pitushka, Director, Engineering & Works
Subject: Proposed Dye Testing of the Foundation Drain Collector (FDC) Sewer – (Z-56)

As part of the ongoing investigation into the basement flooding matters affecting residences in Zone 56, the Transportation and Works Department proposes dye testing of the Foundation Drain Collector Sewer System along the following roadways:

  • Nightshade Lane
  • Prairie Circle
  • 10th Line West (first four cul de sacs south of Trelawny Circle/Battleford Road)
  • Maple Gate Circle
  • Nighthawk Trail

Dye testing is a procedure used by the Transportation and Works Department to determine and identify sources of cross-connected flows into the sewer systems. The dye used as part of the investigation is non-toxic, biodegradable and poses no harmful effects to humans, wildlife or the environment. The process requires staff to gain access into identified homes and pour the diluted dye into toilets and drains. Following the introduction of the dyed water, the downstream sanitary sewer maintenance hole is checked for the dyed mixture. The duration of the dye test lasts approximately 15 minutes per household. Testing has been scheduled to commence on Saturday, December 15, 2012. Once results of the dye tests have been reviewed, staff will provide a response detailing any recommended actions.

A copy of the notice that will be delivered to affected residences is available here.


Activity Update: Oct. 31

Earlier this month, I posed a series of questions to the Transportation and Works staff about specific issues related to their ongoing flood-response activities. I received the following response (see below).

I am happy with the efforts undertaken to date and that the City continues to make this a top priority. Furthermore, I am delighted that we have had no reports from residents of flooding this week throughout the Lisgar community.

Kindest regards,
Sue

1.      Residents are concerned with rocks at the pond’s outlet flow control structure which have been moved by passers-by to enable them to easily step across and over the water. Is this creating a dam?  Furthermore, is there a safety concern; after a rain event, water flows quickly over the rocks, causing slippery conditions.  Is it feasible to install some kind of permanent solution to a) either avoid this being a short cut pedestrian walk through – ie: installing fencing on both sides of the structure or b) eliminating the possibility of moving the rocks – ie: installing wire mesh over the rocks to secure them in place?

Transportation and Works Department staff inspected the Osprey Marsh pond outlet structure on October 22, 2012.  The unauthorized rock crossing was observed as described and appears to serve as a pedestrian shortcut through the stormwater management facility rather than going around to the Ninth Line bridge.   Although flows appear to be sufficiently getting through the rock crossing and just a minor impact on the water elevation in the pond was observed, Maintenance staff will schedule the removal of the rock crossing at their earliest opportunity.  Staff also advises that the placement of wire-mesh over the rocks is not favourable from a long-term maintenance or weir adjustment perspective and could be detrimental to the system. 

Regarding the safety concerns with the potential on-going issue of residents building and using a rock crossing over the pond outlet structure, as an initial approach staff will post additional warning signs in key areas to advise residents of the risks.  Staff will continue to monitor the condition of the outlet structure to ensure any future crossings are not negatively impacting the water level in the pond.  Staff will also evaluate methods to deter residents from accessing the outlet, possibly with plantings.  If these efforts prove unsuccessful, fencing will be considered as a last resort.

2.      A resident noted the lack of water flow on the west side of the Ninth Line underpass; there is thick brush along with plenty of garbage (including skids). Is the city doing anything to ensure the flow of water is not impeded on the west side of Ninth Line?

On October 19, 2012, Transportation and Works Department staff located and removed the refuse that had been dumped into the channel west of Ninth Line.  Staff would like to kindly encourage area residents to call 311 as soon as any indiscriminate dumping is encountered, to trigger a Service Request with maintenance staff.

The Transportation and Works Department Maintenance Section has included the Osprey Marsh pond outlet weir and channel on its list of storm outlets and watercourses that are routinely inspected and cleared of debris and refuse as required.

With respect to the thick growth of vegetation in the channel west of Ninth Line, staff notes that the physical characteristics of the channel, in terms of its relatively low slope and prolonged wet conditions, make it prone to vegetation growth.  This long-term heavy vegetation condition was accounted for in the design of the recently re-constructed pond outlet structure.  As such, this vegetation is not impeding the flow from the pond and staff advises that it is not necessary to remove the vegetation at this time.  Staff will continue to monitor and assess the vegetation conditions, however.   

3.      The city applied to Conservation Halton for a permit for in-stream dredging at three creek crossings back on July 16. Has this permit been approved? If not, what is the delay? When can you expect the permit to be approved and who is pushing the conservation authority to make this happen?

This permit has not yet been received, but dialogue with Conservation Halton staff has been on-going and co-operative.  CH provided a list of detailed comments on August 28th, which was followed up by a site meeting on September 10th to review their comments and concerns.  Additional field survey information and design details were requested, including grading drawings, notes on construction methods and materials, vegetation impacts and post-construction remediation plans.  Staff has been working to collect and compile this information and to prepare a revised set of drawings for re-submission.  This is expected to be completed and submitted to CH by November 2nd.

4.      A resident noted a huge boulder, previously taken out of the concrete-lined portion of the creek and placed near the edge of the creek, has been returned to the creek just north of the Osprey Bridge. It has been seen to affect the flow of water (and spread of water outside of the creek’s banks) during and after rain events. Is the city planning to remove the boulder again? If so, can staff dig a hole in which to place the boulder so it is not easily returned to the creek by those who frequent the woodlot?

This boulder will be removed as part of the bridge crossing dredging activities, once a permit has been issued.  As part of the dredging process, all excavated material removed from within the creek channel (including the subject boulder) will be hauled off-site and properly disposed of.

5.      I have been told that the creek has about 8 inches of sediment toward the bottom of the creek bed most of the way along the concrete-lined portion. Will this be dredged?

The dredging will be limited to a number of storm outfall channels and the creek bed in the immediate vicinity of Osprey Boulevard, Doug Leavens Boulevard and the pedestrian bridge behind Forest Bluff Crescent.  The needs, benefits and constraints of dredging the remainder of the creek will be evaluated as part of the Engineering Study.

6.      Is there an overall plan that the City and external Consultant have with respect to the work they are carrying out on this project? For example, are there more permits that the city will be applying for from Cons. Halton? Are there more gauges being installed and monitored? Will there be a careful analysis of the watershed north of the railway tracks? Etc.?  These are just examples. I am wondering… what is the master plan for the activities that remain to be completed before the end of the work and study?

The master plan that the City and the engineering consultant presented at the public meeting last December laid the groundwork for the efforts undertaken by both parties to date.  This plan has been adjusted or enhanced as needed, such as in the form of additional inspection works by the City or the installation of additional monitoring devices by the consultant.  To answer the specific questions:

  • Aside from the permit application still outstanding with Conservation Halton, no additional permits will be sought until the consultant’s study is complete
  • Two additional FDC sewer monitoring devices will be installed this month to enhance some of the data that has already been collected
  • Monitoring of creek and groundwater flows from the lands north of the railway has been occurring as part of the consultant’s work plan

Moving forward, the planned City activities are:

  • complete the storm outfall dredging works this fall and creek crossing dredging works this winter (during frost conditions)
  • remove the inappropriate rocks from the Osprey Marsh pond outlet structure and assess the need and options to deter pedestrian traffic from this area
  • conduct additional smoke testing in areas of the FDC sewer system this fall
  • continue to dispatch crews to the Lisgar area to observe and respond to road, sewer and creek drainage/flooding issues during large rainstorm events
  • continue to liaise and work with our Region of Peel colleagues in response to basement flooding complaints

The planned Consultant activities are:

  • continue the creek flow, groundwater, FDC and storm sewer monitoring until the end of November, weather conditions permitting, at which point the monitoring equipment will be removed from the field
  • compile and analyse the monitoring data with respect to potential causal factors of basement flooding
  • complete the hydraulic and geomorphic assessments of the creek
  • prepare a report in early 2013

Activity Update: Sept. 28

Here is my latest update from City staff. —Sue

City Inspection and Maintenance Activities

  • The City is continuing to work with its partners at Conservation Halton and the Region of Peel to inspect, monitor and maintain the creek and sewer systems.
  • The vegetation cutting operations along the in-stream (open water) portion of the creek corridor were completed in mid-September.
  • The creek is walked and inspected after rain events to identify and remove excess debris and blockages to storm drainage inlets/outlets. 
  • The outlet structure of the Osprey Marsh stormwater management pond is also inspected and cleaned following rain events.  Concerns regarding the deposit of rocks in the creek just downstream of this structure will be investigated by staff.
  • Staff advises that indiscriminate dumping activities continue to occur along the creek and the Osprey pond.
  • Maintenance activities will be undertaken, starting in late September, at a number of storm sewer outfalls to improve flow.  Occasional short-term closures of portions of the pedestrian trail will be required for the movement of equipment to the work sites.
  • City staff are continuing to work closely with Conservation Halton staff to obtain environmental approvals for additional improvements along the creek. 

Engineering Study 

As per the approved work plan, the Consultant has continued to gather field data since the previous update.  The monitoring has involved gathering information from multiple systems in multiple locations including:

Surface Water

  • A rainfall gauge was installed to complement other City gauges
  • Four instream level gauges have been installed in the creek at various locations
  • A storm sewer water level gauge has been installed at the Scotch Pine storm outfall to Sixteen Mile Creek
  • Twelve level gauges were installed in strategic locations throughout Foundation Drainage Collector (FDC) system network

Groundwater

  • Two additional monitoring sites were added, one adjacent to a home on Osprey Boulevard and another on Scotch Pine
  • Two additional ‘background’ monitoring sites were established in the Black Walnut Trail area
  • Assessment work is on-going and further interpretation of the data and related analyses will be completed following the conclusion of the monitoring program near the end of this year.    

Update: Sept. 25

The City of Mississauga received from Conservation Halton the first of two permits that it applied for over the summer.  This one is to dredge a number of storm outfall channels in the creek from Osprey Boulevard to just upstream of Doug Leavens Boulevard.  T&W staff and contractors will initiate their site preparation work on Sept. 26 and expect to commence the dredging activities later in the week.  They anticipate that work will take about two weeks to complete.  Some sections of the trail will have to be closed for short durations to bring equipment to/from the dredging sites.  Signage will be erected to inform residents of the work activities and T&W staff will also keep Parks staff apprised.


Activity Update: July 17

The following information is provided in response to my questions posed to City staff regarding the Lisgar flooding issue.

1.  Dredging along Sixteen Mile Creek:

A permit application was submitted to Conservation Halton by City staff in June to allow the dredging of a number of storm sewer outfall channels into the creek.  This application is currently under review by Conservation Halton staff.

Staff are currently finalizing an application for in-stream dredging at three creek crossings; namely, Osprey Boulevard, Doug Leavens Boulevard and the pedestrian bridge behind Forest Bluff Crescent. This application will be submitted to Conservation Halton the week of July 16.

With respect to the remainder of the Sixteen Mile Creek, its hydraulic conditions (flow capacity) and geomorphic conditions (physical form, as it changes over time) are currently being assessed by the engineering consultant (AMEC) as part of their study.  

2.  Cutting of Vegetation:

The vegetation along the in-stream (open water) portion of the creek corridor has been completed north to the CP railway. 

A small maintenance crew is continuing to trim the in-stream vegetation as it re-grows. 

3. Section of Creek west of Ninth Line (downstream of Osprey Marsh):

The hydraulic capacity of the outlet structure from the Osprey Marsh pond has been addressed by a recently completed Capital Works project.  No further creek works are planned downstream of the Osprey Marsh at this time.


Legal Update: June 11 and 20

For questions related to the Class Action law suit, please contact the City Solicitor.
For questions related to activities related to the flood, contact Transportation and Works.
To file a claim with the City, contact Risk Management.

I and my office are committed to continuing our support for the Lisgar residents affected by the flood. Please feel free to contact my office with questions or feedback.

Sue


Activity Update: June 7

The following is a summary of the preliminary findings and observations to date from the
consulting firm AMEC of their engineering study, as well as the City’s inspection and
maintenance efforts in response to the Lisgar District flooding issues.

AMEC’s engineering study:

  • The engineering study being conducted by the consulting firm AMEC is progressing as
    scheduled.
  • To date, the following monitoring devices have been installed in the field:
    a) Four (4) water level and temperature gauges in the Foundation Drain Collector
    (FDC) sewer system; and,
    b) Twelve (12) groundwater monitoring wells (piezometers), fitted with water level
    and temperature gauges.
  • With the exception of recent rain activity, little precipitation has fallen since the various
    monitoring devices were installed in late December and early January. As a result, much
    of the data collected so far reflects dry weather conditions and relatively small rainfall
    events. Wet weather events that will inevitably occur during the remainder of the
    monitoring and engineering study are expected to yield valuable information.
  • The FDC sewer monitoring devices have observed low water levels (during dry weather)
    with no surcharging (i.e. water levels rising to above the top of the sewer pipe, under
    pressure). The data indicates that FDC flow response times following rainfall and
    snowmelt events are relatively short. As noted previously however, the occurrence of
    precipitation events during the remainder of the monitoring program is expected to
    yield more comprehensive data for analysis.
  • The groundwater monitoring devices confirm that the undisturbed soils are of low
    hydraulic conductivity (i.e. water passes through it very slowly) and indicate that the
    groundwater has limited interaction with the creek. Contribution of water from the
    creek through the soil to the foundations of homes is of low likelihood.
  • The groundwater monitoring device installed within the soil and granular stone backfill
    and bedding material of a storm sewer pipe near the creek has observed that
    groundwater in the bedding material appears to rise and fall in elevation in reaction to
    rainfall events. Three (3) additional storm sewer bedding monitoring sites were added
    in late May to develop a better understanding of the groundwater within the backfill
    and bedding material of the sewer, including how it may be influenced by factors such
    as rainfall, sewer flow and stream levels.
  • Eight (8) additional FDC monitoring devices, a storm sewer flow monitoring device, four
    (4) stream flow gauges, two (2) additional groundwater monitoring wells and a shallow
    drive-point piezometer will be installed over the next month. A location is being sought
    to accommodate the installation of a temporary rainfall gauge in the study area as well.
  • A review of previous groundwater and geotechnical reports conducted within the Lisgar
    District prior to the development of the area, as well as historical maps and Ministry of
    Environment Water Well Records has been completed. The reports indicate that soils in
    much of the area (Halton Till) have low hydraulic conductivity. The groundwater
    appears to be high in some areas, with evidence of perched groundwater and isolated
    artesian conditions (i.e. water rising to above the ground surface) in some areas
  • Hydraulic modelling and a fluvial geomorphic assessment of the Sixteen Mile Creek are
    underway to:

    • a) assess the existing flow capacity of the creek to ensure that its primary drainage
      objectives are being met;
    • b) provide information on the interactions (if any) between the creek and the
      basement flooding issues; and,
    • c) provide guidance on the overall function, performance concerns and
      recommended improvements to the creek, if required.
  • It is noted that, to date, no needs for corrective or maintenance activities have been
    identified by the engineering study. However, the results are still considered
    preliminary. The monitoring efforts will increase in scope as discussed above and will
    continue through the end of 2012.

City inspection and maintenance activities:

  • City survey crews completed a topographical survey of the entire creek corridor from
    the Osprey Marsh stormwater management facility to the CP Rail tracks. This
    information was processed by staff and forwarded to the engineering consultant to
    assist in their technical assessments of the creek.
  • Cutting of the vegetation along the Sixteen Mile Creek has been completed from Osprey
    Boulevard to just upstream of Terragar Boulevard.
  • City staff submitted an application package to Conservation Halton on June 1st with
    drawings and details to support the dredging of sediments from a number of storm
    sewer outfall channels to the creek. Staff is currently preparing an application package
    to allow the dredging of sediments and vegetation from the concrete lined channel
    areas adjacent to the Osprey Boulevard and Doug Leavens Boulevard creek crossings.
    This dredging work is planned to commence in July, subject to approval from
    Conservation Halton. The dredging needs of the “naturalized” channel sections require
    more detailed study, for which the consultant will be providing professional advice as
    part of their assignment.
  • Flushing and closed circuit TV inspections of the FDC sewer have been completed on the
    roads that were affected by flooding. Staff is in the process of reviewing the gathered
    information. Planning efforts are underway to expand the FDC sewer flushing and CCTV
    inspections to other areas.
  • City crews are in the process of clearing materials accumulated in the bottoms of FDC
    manholes and sealing some isolated manholes where water might be able to enter the
    pipe.
  • The FDC trunk sewer manhole marker signs have been prepared and have been installed
    along the creek corridor.
  • Staff advises that indiscriminate dumping activities along the Sixteen Mile Creek
    continues to occur, which is causing time-consuming and costly clean up operations for
    City crews.

Activity Update: Apr. 30

I’m providing the following update on the recent work carried out by the city and the city’s engineering consultant.

City inspection and maintenance activities:

  • Cutting of the vegetation along the Sixteen Mile Creek is expected to be completed by April 30th.
  • City staff, in partnership with Conservation Halton, is putting together the drawings and details to dredge sediment from the storm sewer outfall channels and the concrete lined channel areas adjacent to the Osprey Boulevard creek crossing.  This work is planned to commence once the Spring fisheries protection period ends on July 1st.
  • Flushing and CCTV inspections of the FDC sewer have been completed on the roads that were affected by flooding.  Staff is in the process of reviewing the gathered information.  Planning efforts are underway to expand the FDC sewer flushing and CCTV inspections to other areas.
  • City crews are in the process of clearing materials accumulated in the bottoms of manholes and sealing water seepages into the pipe.
  • The FDC (foundation drainage collection system) trunk sewer manhole marker signs have been prepared and will be erected by April 30th.
  • Staff advises that indiscriminate dumping activities along the Sixteen Mile Creek continues to occur, which is proving to be both a time-consuming and costly endeavour for City crews to clean up.

Consultant’s engineering study:

  • On April 17th, the City’s consultant provided staff with an interim update on their engineering study, including their monitoring activities, review of previous reports, data and mapping, and their preliminary findings to date. It is anticipated that this report will be made available soon.
  • The FDC sewer monitoring devices (4 locations) have observed low water levels (during dry weather) with no surcharging (i.e. water levels rising to above the top of the sewer pipe, under pressure).  It is noted however that only low precipitation events have occurred since the monitoring began.  The data indicates that FDC flow response time following rainfall and snowmelt events is relatively short.  Rainfall data collected by the City’s gauge near Britannia Road West and Erin Mills Parkway (Station #7) during the monitoring period is currently being processed by City staff and will be provided to the consultant for their analysis in the next week or so.
  • A review of previous groundwater and geotechnical reports conducted within the Lisgar District prior to the development of the area, as well as historical maps and Ministry of Environment Water Well Records has been completed.  The reports indicate that soils in much of the area (Halton Till) have low hydraulic conductivity (i.e. water passes through it very slowly).  The groundwater appears to be high in some areas, with evidence of perched groundwater and isolated artesian conditions (i.e. water rising to above the ground surface) in some areas. 
  • The groundwater monitoring devices installed in December and early March confirm that the soils are of low hydraulic conductivity and indicate that the groundwater has limited interaction with the creek.  Contribution of water from the creek through the soil to the foundations of homes is of low likelihood.
  • The groundwater monitoring has also indicated that the storm sewer bedding has demonstrated some response following rainfall events.  Further investigations are required to determine the source(s) of this water.
  • Hydraulic modelling of the Sixteen Mile Creek is underway.  Topographical survey data collected by the City and modelling and mapping data from Conservation Halton has been provided to assist with this analysis.
  • Eight (8) additional FDC monitoring devices, a rainfall gauge, a storm sewer flow monitoring device and the stream flow gauges will be installed this spring.

Activity Update: Mar. 30

The City continues with its efforts toward finding a solution to the cause of the flooding in Lisgar last fall. An independent consultant (AMEC) was hired to perform an engineering study on the storm sewer system as well as the creek and pond and is scheduled to release its interim report some time in April.

In the meantime, the Sixteen Mile Creek has been the focus of significant work with the cutting of vegetation along the channel to improve the flow of water. In January, crews began this work at the south end of the creek where it meets the Osprey Pond and they are moving north of Derry Road at the start of April where the work will be completed just north of Terragar Boulevard where the instream vegetation tapers off.

This past month, City of Mississauga and Conservation Halton staff conducted a detailed inspection of the dredging needs of creek. The initial focus is on the storm outfall channels and sections of the creek which are concrete lined. The dredging needs of the “naturalized” channel sections (north of Bishop Strachan Court) require more detailed study, for which the City’s consultant will be providing professional advice as part of their assignment.


Activity Update: Mar. 6

March 6, 2012—As part of my commitment to keep residents informed as much as possible, please find below my latest update on the ongoing activities around the Sixteen Mile Creek and Osprey Pond related to the flooding.

  • City of Mississauga staff have been using Closed Circuit Television cameras to inspect the Foundation Drain Collectors and storm sewers and flushing these as necessary. The sewers on the streets that experienced flooding have been completed and efforts are now focused on other key streets in the neighbourhood, including Tenth Line. These activities will continue into the spring.
  • The cutting of vegetation along the low flow channel of the Sixteen Mile Creek (Lisgar Channel) is more than 50% complete and is expected to be finished by the end of March.
  • City and Conservation Halton staff are working closely to assess and plan short term dredging needs in the Sixteen Mile Creek, and will work together to satisfy regulatory permit requirements for any proposed dredging works.
  • The installation of the second phase of groundwater boreholes (5 deep, 3 shallow) will be carried out by the independent consultant between February and April 2012, based on the results from the first phase of boreholes. Groundwater monitoring will continue through November, 2012.
  • The installation of stream flow gauges (3) along the creek will take place this month and next, depending on weather conditions, as will the installation of the second phase of FDC sewer flow monitors (8), based on results from first phase of monitors.
  • Currently, the consultant is collecting and assessing data from the first phase of groundwater and FDC monitoring devices. The consultant is also assessing the physical condition of the creek, including its flow capacity, its physical characteristics, and its interactions, if any, with the local groundwater conditions and/or other potential connections to the basement flooding problems.
  • The interim report on potential groundwater, FDC or creek causes (if any) to the basement flooding will be submitted to the City in April 2012.
  • The current work on the Osprey Pond is focused on reconstructing the outlet flow control structure and minor improvements in areas along the perimeter of the pond.  This construction contract is expected to be substantially completed by March 31, 2012.
  • I have met with a small group of residents in February as a way to gather information and share questions and answers about what’s happening, has happened and will happen. We will meet again this week for further discussion.

Many thanks to the residents who have e-mailed my office over the past month with questions or concerns about the activities taking place in the area. You are our “eyes on the street” so to speak, and the information you provide is helpful to the ongoing work and investigation.


Activity Update: Jan. 25

January 25, 2012—The following is a summary of the activities undertaken by Transportation & Works in the Lisgar community since the first week of January:

  • The removal of creek vegetation has been completed from the Osprey Marsh pond to just north of Doug Leavens Boulevard, which is about one third of the entire length to be cleared.  This work is continuing north to the CP Railway crossing.   
  • Crews are continuing to flush and conduct CCTV inspections of the foundation drainage collection (FDC) sewers in the areas impacted by flooding.  Approximately 40% of the affected streets have been completed.
  • Water infiltration repairs within the FDC sewers will commence early next week, weather permitting. 
  • Flow monitoring devices have been installed at four key locations in the FDC sewer system, as part of the consultant’s work plan.  This data will complement the groundwater monitoring activities which began in late December.
  • DVD copies of the video transcript of the December 14th community meeting were mailed to the residents (16, approx.) who had requested a copy. 
  • The tender for the Osprey Marsh pond improvement works closes today.  Assuming satisfactory bids are received, construction is expected to commence in late February.

Activity During and Following Jan. 23 Rainfall

January 24, 2012—During the rain on January 23, the Area Supervisor and Assistant Supervisor completed a site condition review and found that the FDC, Storm and Creek systems were operating within normal parameters.

Transportation & Works staff was on site reviewing the state of our systems and ensuring that the systems were operating in accordance to established parameters. We will continue with our field work to ensure the integrity of the FDC System and the removal of a 4.5m swath of vegetation centred on the Sixteen Mile creek low flow channel. We will also continue to monitor this area during any significant rainfall.


Activity Update: Jan 6, 2012

January 6, 2012—The following is an update on the recent activities undertaken by Transportation & Works in the Lisgar community:

  • the removal of creek vegetation has been on-going since HRCA approval was received on December 22nd and is expected to be completed in a month or so
  • the stone filters around the outlet pipes in the Osprey Marsh pond were removed and replaced, which has improved the pond’s ability to drain down to its normal water level following rain events
  • the lids of the FDC manholes situated within the berm which passes between the main cells of the Osprey Marsh pond were inspected and freshly sealed to reduce the potential for inflow
  • potential FDC cross-connections identified through smoke testing in the Black Walnut area were inspected and found to be false readings (i.e. no cross-connections or improper sources of inflow were revealed)
  • crews are continuing to conduct CCTV inspections and flushing of the FDC sewers within the areas impacted by flooding
  • as a next step, crews will seal off any cracks or joints within the FDC sewers which are found by the CCTV inspections to be sources of inflow
  • staff has received from 46 completed questionnaires that were distributed to attendees of the December 14th meeting, as well as 16 requests for a DVD copy of the meeting
  • staff is in the process of producing copies of the DVD for distribution
  • it is also noted that staff continue to receive completed questionnaires from the October 28th circulation to residents

Community Meeting on Lisgar Flooding: Dec. 15, 2011

December 15, 2011—About 200 residents were updated at a community meeting on December 14about the city’s ongoing investigation and activities related to the flooding issues in the Lisgar community.

The focus of the meeting was on outlining the steps that city and regional staff have undertaken toward finding the root cause or causes of the flooding.

The issue of possible compensation will be addressed following the submission of an engineering study by an external consultant expected in early 2013.

In the meantime, the city will respond immediately as necessary to findings in the study prior to its completion. In addition, during High Water Warnings, city crews will be dispatched to strategic locations in the Lisgar area to monitor water levels and take appropriate action to mitigate further problems.

Presentation Materials:
Visit www.mississauga.ca/flooding to download the slide presentation from the meeting.
E-mail water.info@mississauga.ca to request a copy of the DVD recording of the meeting.
Call 905-791-7800 x4615 to request a household drainage survey for your home provided free of charge by the Regional of Peel.