The Corporation of the City…

The Corporation of the City of Barrie's Environmental Compliance Unit (City) has reviewed the ERO proposal and has the following discussion comments to be taken into consideration:

1. All reports associated with the inspection and monitoring programs should be submitted to COB for review and comment.

2. There are no measures covered in the CPU that mitigate the potential for off-site migration of the COC’s found in the groundwater. The City is requesting that an additional clause that demands a RMM be implemented to prevent off Site migration.

3. Figure 6 – ‘Groundwater Elevations – Shallow Wells – April 8, 2022’ by Cambium dated April 2020 provide the locations of the boreholes installed on the property. Section 4.2.9.1 of the CPU outlines the groundwater monitoring program. Boreholes installed within the building footprint area should/must be re-installed after construction for the purpose of the requested on-going ground water monitoring program as outline section 4.2.9.1 of the CPU.

4. Section 4.2.4 – Future Site Development – The CPU states that all impacted Soil, impacted Ground Water encountered during future site development that was not addressed under the Risk Assessment must be delineated and mitigated/remediated in keeping with the requirements and assumptions of the Risk Assessment.
i. The City is requesting a drawing/explanation of what areas were not addressed in the RA in order to adequately comment on future Site Plan applications etc.

5. Section 4.2.6 – Soil Vapour Intrusion Mitigation Systems (SVIMS) – Passive SVIMS the final design including drawings and specifications, as well as the sign-off by the professional engineer.
i. Will this system be given to the City of Barrie Chief Building Official for approval/sign off? These final designs should also be submitted/approved by the City before implementation.

6. Section 4.2.6.1.2 – Sub-Slab Foundation Layers – This layer is installed below the foundation floor slab, a sub slab foundation layer, designed by a Licensed Professional Engineer for the Building constructor, shall be installed in consultation with the Licensed Professional Engineer for the SWIMS.
i. Will these details/drawings be provided to the City of Barrie Chief Building Official for approval/sign off? The details/design of this foundation layer should also be submitted/approved by the City before implementation.

7. Section 4.2.6.1.3 – Soil Vapour Venting Layer – this layer will be installed below the foundation floor slab and above the sub-slab foundation layer, which is designed to collect and vent soil vapour from below the floor slab to vent risers which vent to the outside air.
i. Will this be included as part of the building permit application? Where will this RMM be captured for review/comment by the City?

8. Section 4.2.6.1.3.ii – clean outs, drains or openings to ensure drainage and removal of condensate or water, including any entrained dust, that may enter collection pipes, etc., and if required to ensure drainage or dewatering of the soil vapour venting layer in Property areas with a shallow ground water table.
i. Will this condensate water contain contaminants of concern? If this condensate water is discharged over ground, the quality of water must meet the City of Barrie Sewer Use By-law 2021-002, as amended, Storm Sewer Limits at property line. Permanent dewatering to the storm and sanitary sewer shall not be permitted in accordance with the City’s Drinking Water Protection Policy.

9. Section 4.2.6.1.4 – Soil Vapour Barrier Membrane – throughout the Building area, a continuous leak free soil vapour barrier membrane such as a sheet geomembrane or spray applied membrane, below the foundation floor slab and above the soil vapour venting layer, and below and along the walls of any subsurface structures such as a sump and in accordance with the appropriate ASTM standards such as D412 and D543.
i. Will this be included as part of the building permit application? Where will this RMM be captured for review/comment by the City?

10. Section 4.2.6.1.5 – Vent Risers – Vent risers must be of sufficient size or diameter, frequency and locations to promote efficient venting and that terminate above the roof of the Building, to convey soil vapour from the soil vapour venting layer to the outdoor air above the roof of the Building and that discharge at an appropriate distance from Building air intakes and openable windows, doors and other openings through which exhausted vapours could be entrained in Building air and, consistent with the separation provisions in ASTM E2121 but modified as appropriate for the characteristics of the soil vapour and Building.
i. Will this be included as part of the building permit application? Where will this RMM be captured for review/comment by the City? Will an ECA for Air be required for the vent risers?

11. Section 4.2.6.1.10 – As Constructed Plans – Prepare as constructed plans of the SVIMS, prepared by a Licensed Professional Engineer and to be retained by the Owner, and be available for inspection upon request by a Provincial Officer, showing the location of the Building and the location and specifications of the installed SVIMS, including cross-sectional drawings specifying the design and the vertical and lateral extent of the SVIMS relative to the Building and the ground surface. should also be
i. The constructed plans should also be submitted to the City for record.

12. Section 4.2.6.1.14 – Building Code - The Building complies with all applicable requirements of the Building Code.
i. Will sign off be required by the City’s CBO to ensure compliance with this section of the CPU? Will this be part of the building permit application?

13. Section 4.2.9.4 If an increasing trend in ground water concentrations are identified and has the potential to cause an off-site Adverse Effect, the Owner shall notify the Director in writing within three (3) business days of receipt of the analytical results and complete additional ground water sampling within ten (10) business days of receipt of the results to confirm the increasing trend. An increasing trend is defined as a concentration that is higher than the average of the concentrations plus twenty (20) percent to account for analytical uncertainty. Average concentrations are to be calculated using historical and current data; if historical data is unavailable, the average will be of the concentrations measured during the previous two (2) sampling events at each location. If the results of the re-sample confirm the increasing trend, the Owner shall notify the Director within three (3) days of receipt of the results and provide a mitigation/assessment plan within ten (10) days of receipt of the results, which may include but not be limited to, evaluation of trends, assessment of risk to receptors, assessment of potential sources or activities that may have affected the ground water, need for additional investigations and/or need for increased monitoring frequency.
i. The City requests that RMM’s be developed and implemented concurrently with other RMM’s which are constructed to prevent any off-site impacts.
ii. The City should also be notified if there is the potential to cause an off-site Adverse Effect.