silo 3 - U.S. Department of Energy

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5069
Silo 3 Environmental Control Plan
40430-PL-0005, Rev. C
roject Number 35H19605
September 23, 2003
Frequently inspected to ensure that the structures have not been damaged by high-
energy flows.
Inspection and repair activities will be documented in the daily reports and available for
review upon request.
3.2.3 Riprap
Where required, properly sized riprap will be placed in the designated work area. Ohio
Department of Transportation Type "D" riprap will be installed in the temporary drainage
channel as check dams at appropriate locations.
Inspection and Maintenance
Riprap will be inspected and maintained according to the following, as a minimum:
0 The criteria stipulated in Section 3.2
0 To determine whether high flows have caused scour beneath the riprap or dislodged
any of the stone. If repairs are needed, ensure that those repairs are accomplished
within the same workday of their discovery.
Inspection and repair activities will be documented in the daily reports and available for
review upon request.
3.2.4 Silt Fences
Silt fences will be installed in accordance with ODNR requirements, the construction
drawings, and the Silo 3 specifications. Silt fences will be constructed before upslope
land disturbance begins. Silt fences will be.installed as close to the contours as possible
so that water will not concentrate at low points in the fence. Silt fences will be installed
on the downslope side of disturbed areas, perpendicular to where run-off occurs as sheet
flow or where flow through small rill can be converted to sheet flow. Appropriate
equipment and personnel will be used to install the silt fence at locations shown on the
construction drawings. The silt fence will be placed in a trench cut to a minimum of 9 in.
deep, staked, and backfilled accordingly. The height of the silt fence will be a minimum of
16 in. above the original ground surface. To prevent water from flowing around the ends
of the silt fence, each end will be constructed upslope so that the ends are 'at a higher
elevation. Seams between sections of silt fencing will be overlapped with the end stakes
of each section wrapped together before driven into the ground. Breaks and overlaps will
be installed as necessary to allow equipment access to the construction area. Silt fences
will remain in place until the disturbed area has been stabilized. Appropriate equipment
will be available to maintain silt fencing.
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