sideslope and downslope boundaries of the
construction area.
For drainage locations serving less than 4 hectares
(10 acres), sediment traps, silt fences, or
equivalent sediment controls are required for all
sideslope and downslope boundaries of the
construction area unless a sediment basin providing
storage for 252 cubic meters of storage per hectare
(3,600 cubic feet of storage per acre) drained is
provided.
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Structural practices shall be implemented to divert flows from exposed
soils, temporarily store flows, or otherwise limit runoff and the discharge
of pollutants from exposed areas of the site. Structural practices shall
be implemented in a timely manner during the construction process to
minimize erosion and sediment runoff. Structural practices shall include
the following devices. [Location and details of installation and
construction are shown on the drawings.]
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NOTE: Listed are examples of typical structural
devices. Requirements for Silt Fences, Straw Bales,
and Diversion Dikes are contained within this Guide
Specification. Specifications for other structural
practices used in the project must be added to this
section.
a.
[Silt fences.]
b.
[Straw bales.]
c.
[Diversion dikes.]
d.
[Drainage swales.]
e.
[Check dams.]
f.
[Subsurface drains.]
g.
[Pipe Slope drains.]
h.
[Level spreaders.]
i.
[Storm drain inlet protection.]
j.
[Rock outlet protection.]
k.
[Sediment traps.]
l.
[Reinforced soil retaining systems.]
m.
[Gabions.]
n.
[Sediment basins.]
o.
[_____].
The permanent stabilization practices which are to
be installed under the contract should be specified
in other section of the specifications. These are
measures that will be installed during the
construction process to control pollutants in storm
water discharges that will occur after construction
operations have been completed. Structural measures
should be placed on upland soils to the degree
attainable. The installation of these devices may
be subject to Section 404 of the Clean Water Act.
A goal of 80 percent removal of total suspended
solids from these flows which exceed predevelopment
levels should be used in designing and installing
SECTION 01356A
Page 7
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