A.
All applicants for construction permits shall have
the application reviewed by the Township Code Enforcement Officer
to determine whether stormwater runoff control is required for the
issuance of a construction permit. The factors to be considered in
making this determination are set forth in the Stormwater Runoff Worksheet.[2]
[2]
Editor's Note: The stormwater runoff worksheet
is available in the Township offices during regular business hours.
B.
In the event stormwater runoff control is required,
the applicant shall be notified in writing of the ordinance requirements
for the required volume of storage and testing procedures.
C.
Stormwater runoff control shall consist of underground
storage and percolation equal to or greater than the stormwater runoff
for the one-hundred-year storm created by the proposed construction.
D.
Stormwater runoff shall be directly connected to the
underground storage facility from existing or proposed downspouts
and/or impervious surface. Managing runoff on the property having
the same or greater square footage as the proposed construction may
be exchanged for managing runoff from the new improvement.
E.
Percolation test.
(1)
Once the applicant has determined a location for the
underground storage facility, a hole must be dug at that location
to the proposed bottom elevation of the underground facility. A percolation
test will be performed, which consists of filling the hole with water
and measuring, from the original ground level, the drop in water surface
every five minutes for 30 minutes. This test will be witnessed by
the Township Code Enforcement Officer, the Township Inspector or another
designated person.
(2)
The percolation test can fail for one of the following
reasons:
(3)
Should the percolation test fail, the applicant shall
be responsible to provide a fee in lieu of the underground storage
facility as set forth in No. 5 of the Stormwater Runoff Worksheet.
This fee shall be revised periodically by the Township to reflect
a comparable value of the system not installed. This fee will be placed
in a Township Stormwater Management Account to provide future Township
stormwater management facilities or activities or to reduce the indebtedness
of previous Township stormwater management facilities or activities.
F.
The underground storage facility can be a hollow structure
or a volume of clean No.57 stone wrapped in a geotextile filter fabric.
(See the Stormwater Runoff Worksheet for the calculations of both
volumes). The proposed underground storage facility shall be approved
by the Township Code Enforcement Officer and the physical construction
of the facility shall be witnessed by the Township Code Enforcement
Officer, Township Inspector or another designated person.
G.
Springfield Township and everyone acting on its behalf
shall not be responsible for subsurface geological conditions which
may create adverse conditions on the applicant's property. An applicant
may be permitted to provide a fee in lieu of underground stormwater
storage after providing sufficient proof of potential adverse conditions
being created. This proof shall be generated by a professional engineer
or geologist registered in the Commonwealth of Pennsylvania and the
proof shall be reviewed by Township staff.
