Chapter A - Introduction - City of Pickering

RESPONSE TO CITY COMMENTS
SWMF LOCATIONS
(APPENDIX B)
30
There is a 7m difference in elevation observed across the proposed pond block. MESPA proposes to construct facility in a fill scenario, and notes that
berming will be required to ensure construction occurs outside the adjacent wetland. Pond receiving system is classified as a headwater drainage
feature with no defined channel, erosion of this system is likely regardless of the recommendations of the erosion control assessment, as 2 ponds (30,
and 48) will drain to the same system. A trunk water main is proposed adjacent to the pond block.
Refer to servicing and grading presented in NFSSR for Neighbourhood 20
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35
36
37
38
40
Pond located +/-140m away from the catchment, unsure as to how major system flows will be directed to the facility. Regional Road cuts the catchment
into two parcels, prior to crossing the NHS, unsure how major system flows will be directed to the facility due to the road configuration. Pond outlet is
proposed to be co located within the Whitevale Rd. ROW.
15m change in elevation within the ponds catchment, ground water may be an issue. Matrices indicate that flood plain mapping needs to be extended up
to the pond block to ensure appropriate pond location is provided, yet the GIS layers include the floodline. A pumping station may be required adjacent
to the proposed pond block.
There is a 6m difference in elevation observed across the proposed pond block. Directing major system flows from the north portion of the catchment
area could be an issue as drainage area is cut by a Regional Road. Outfall proposed to be co-located within the proposed road right of way. A trunk
water main is proposed adjacent to the pond block.
Major system flows from the northern portion of the catchment may not be able to be conveyed to the pond due a Regional Road which bisects the
catchment. There is a large crossing of the NHS just east of the catchment, which may set out the road grade requirements. 2 ponds may be more
feasible, if so north pond can provide controls for proposed On site control area (Area R).
Large catchment area which is cut into 3, due to 2 proposed Regional Roads, given this configuration, unsure how major system flows are conveyed to
the pond. The proposed pond block is within the Regulatory floodplain. A hydraulic assessment (potentially including Cut/Fill balance calculations) will
need to be completed to confirm that the pond is located outside the 100 year floodplain. A trunk water main and sanitary sewer is proposed adjacent to
the pond block.
Pond is located within Whitevale Creek subwatershed. As per MESPA analysis presented in Chapter B Section 5.x, this facility will
be a quality only pond. Major system flows will be directed to the valley at various locations throughout the development. Refer to the
NFSSR for Neighbourhood 18 for the grading and servicing details.
The matrix has been corrected. Soils work to date indicates no insurmountable ground water issues. Refer to servicing and
grading presented in NFSSR for Neighbourhood 18.
Pond is located within Whitevale Creek subwatershed. As per MESPA analysis presented in Chapter B Section 5.x, this facility
will be a quality only pond. Major system flows will be directed to the valley at various locations throughout the development.
Grade difference across pond now in the order of 5.0m. Refer to servicing and grading presented in NFSSR for Neighbourhood
18.
Major system capture will be required and will be presented at detailed design. Single pond still proposed. Refer to servicing
and grading presented in NFSSR for Neighbourhood 18.
Major system capture will be required and will be presented at detailed design. Whitevale Road crossing to be analyzed to
address hydraulic concerns at NFSSR stage if model available otherwise will be completed at detailed deign stage. Refer to
servicing and grading presented in NFSSR for Neighbourhood 19.
Pond located on valley wall, a 10m difference in elevation is observed across the proposed pond block. Unsure how facility will be constructed, as a Refer to servicing, grading and hydrogeological analysis presented in NFSSR for Neighbourhood 19.
substantial amount of fill, or cut, will be required. +350m outfall pipe required to convey flows from the pond to the discharge point, which is co-located
within a Regional Road ROW. Flow path for emergency outlet flows will need to be determined. Geotechnical report is required, which may dictate an
alternative location for the facility. Constructability may also dictate an alternative pond location or an increase in pond block size. Also unsure how major
system drainage from the north portion of the site will be conveyed to the pond as 2 crossings (west and east) of the NHS is required adjacent to the
catchment. Reported drainage area, and pond block size differs between matrices and Arc Reader document, based on GIS pond block is only 5.5% of
the total DA. A trunk water main and sanitary sewer is proposed adjacent to the pond block.
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43
44
46A
46B
47
Pond is located along the side of a hill, with a 5m difference in elevation observed across the proposed pond block. A +10m change in elevation is Refer to servicing and grading presented in NFSSR for Neighbourhood 19.
observed across the catchment area; given the location of the pond groundwater may be an issue. 2 Regional Roads bisect the catchment area, unsure
how major system flows will be directed to the facility from portions of the catchment. In addition the south east portion of the catchment has elevations
lower than the elevations observed at the pond block (existing conditions). Outlet is proposed to be located within significant vegetation; maintenance
access may be an issue.
30m drop in elevation across drainage area, given location of the pond groundwater may be an issue. There is a 9m drop in elevation from pond, to Refer to servicing, grading and hydrogeological analysis presented in NFSSR for Neighbourhood 19.
outlet point; in addition the outlet is proposed to be within significant vegetation. Access for maintenance to outlet will be an issue. A sanitary trunk is
proposed through the pond block.
Significant grading required to direct major system flows to the facility, as a portion of the catchment is lower than the pond (under existing conditions). Refer to servicing and grading presented in NFSSR for Neighbourhood 19.
Regional Road cuts through the catchment, so directing major system flows to the pond may be an issue. It may be better to cut the northwest portion
of the catchment, and combine it with the north portion of the catchment for Pond 26, and make another facility. Berming along the south portion of the
pond will be required. Pond also drains to a HDF, with no immediate channel (GB-4), and an active erosion gully downstream, erosion will be an issue
regardless of the recommendations of the erosion assessment. A sanitary trunk is proposed through the pond block.
Long narrow catchment cut in 2 by the existing Brock Rd. ROW. Concerned with how the grading within the block will work as the existing road is within Refer to servicng and grading presented in NFSSR for Neighbourhood 20.
a cut scenario. Given that the Regional EA is not complete there may be an opportunity to direct drainage from On Site Control Area G. The outfall is
proposed to be co-located within a Regional Road ROW. There is an 8m drop in elevation from the pond outlet to the discharge point, so maintenance
access will be an issue. A trunk water main is proposed adjacent to the pond block.
There is a 12m difference in elevation observed across the proposed pond block. Directing drainage from the south portion of the catchment may be an Refer to servicng and grading presented in NFSSR for Neighbourhood 20.
issue as there are elevations lower than elevations within the proposed pond block. There is also a 9m drop in elevation from pond to proposed outlet
point; as such maintenance access will be an issue. Also outlet is proposed to be located in a densely vegetated area.
There is a 7m difference in elevation observed across the proposed pond block. Substantial grad change across the catchment area (18m), so ground Refer to servicng and grading presented in NFSSR for Neighbourhood 20.
water may be an issue. Pond proposed to discharge to HDF (HWDFC17) with no active channel, erosion will be an issue regardless of the
recommendations of the erosion analysis.