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surface or are within 2 metres of the highest
recorded water table elevation from June 1st
to October 1st must:
a.
be water proof. Water proofing of the
structure must utilize materials that will
not impact groundwater quality and be
approved by the Engineer;
b.
have an internal design that minimizes
potential cracking of the foundation
and includes treatment of cold joints to
create a complete separation between
the structure and the Aquifer;
c.
be constructed with a monitored drain-
age system for water volumes and
hydrocarbons to detect all upsets;
d.
not adversely impact groundwater flow
patterns; and
e.
include an internal drainage system that
discharges drainage from below grade
structures to a sanitary sewer line.
4.
All storm water, with the exception of
residential foundation drains, shall be
conveyed off-site to municipal storm sewers.
5.
Stormwaterfromroadwaysanddrivewaysshall
not be discharged directly to ground by means
of exfiltration systems or rock pits within the
60-DayCaptureZone, asdelineatedonMap1A.
6.
Drainage from subsurface structures and
parking lot facilities, with the exception
of residential roof and foundation drains,
shall be controlled using a closed system,
which includes oil and grit separators
conveyed off-site to a municipal storm sewer.
7.
Where a municipal storm sewer system is not
available, drainage from subsurface structures
and parking lot facilities shall be conveyed to
outside of the 60-Day Capture Zone (shown
on Map 1A) to a triple chamber treatment
facility, which must include, but is not limited
to, an oil and grit separator and a gate valve
before the infiltration chamber to contain
spills.
8.
On-site treatment facilities shall be designed
by a Qualified Environmental Professional and
must ensure the discharged water will not
degrade the quality of the aquifer.
9.
Commercial, industrial and parking facilities,
having areas that are not paved or completed
with buildings, shall be covered with low
permeability material to reduce infiltration.
A soil liner consisting of 0.60 metres of fine-
textured soil (clay or clay-loam) constructed
beneath Topsoil is an acceptable alternative.
10.
All Hazardous Materials, which are handled,
and/or stored, shall be minimized and subject
to secondary containment utilizing non-
permeable construction material, which may
consist of a concrete pad and sidewalls to
contain the substances should a spill or leak
occur. The storage area shall be covered and
secured against vandalism. The capacity of
secondary containment shall equal at least
the maximum volume of the stored material,
plus 10%. Secondary containment systems for
volumes of hazardous material greater than
200 litres shall be inspected by a Qualified
Environmental Professional.
11.
No underground storage tanks for Hazardous
Materials shall be permitted. Above ground
storage tanks for Hazardous Materials shall
conform to requirements set out in this
guideline for Petroleum Storage Tanks.
12.
Temporary storage of Hazardous Materials
during development and/or construction
shall:
a.
Utilize secondary containment;
b.
Be covered and secured against
vandalism; and
c.
Be protected from damage due to
construction equipment and/or
construction activities.
Implementation Guide