The stabilization practices to be implemented shall include [temporary
seeding,] [mulching,] [geotextiles,] [sod stabilization,] [vegetative
buffer strips,] [erosion control matts,] [protection of trees,]
[preservation of mature vegetation,] [etc]. On his daily CQC Report, the
Contractor shall record the dates when the major grading activities occur,
(e.g., [clearing] [and grubbing,] [excavation,] [embankment,] [and]
[grading]); when construction activities temporarily or permanently cease
on a portion of the site; and when stabilization practices are initiated.
Except as provided in paragraphs UNSUITABLE CONDITIONS and NO ACTIVITY FOR
LESS THAN 21 DAYS, stabilization practices shall be initiated as soon as
practicable, but no more than 14 days, in any portion of the site where
construction activities have [temporarily or] permanently ceased.
1.4.1.1
Unsuitable Conditions
Where the initiation of stabilization measures by the fourteenth day after
construction activity [temporarily or] permanently ceases is precluded by
unsuitable conditions caused by the weather, stabilization practices shall
be initiated as soon as practicable after conditions become suitable.
1.4.1.2
No Activity for Less Than 21 Days
Where construction activity will resume on a portion of the site within 21
days from when activities ceased (e.g., the total time period that
construction activity is temporarily ceased is less than 21 days), then
stabilization practices do not have to be initiated on that portion of the
site by the fourteenth day after construction activity temporarily ceased.
1.4.2
Structural Practices
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NOTES: Describe structural practices to divert
flows from exposed soils, store flows, or otherwise
limit runoff and the discharge of pollutants from
exposed areas of the site to the degree attainable.
A permit under Section 404 of the Clean Water Act
may be required for certain structural practices.
Check with Permits Branch.
For common drainage locations that serve a disturbed
area of 4 or more hectares (10 or more acres) at one
time, a temporary or permanent detention basin
providing 252 cubic meters of storage per hectare
(3,600 cubic feet of storage per acre) drained, or
equivalent control measures, shall be provided where
attainable until stabilization of the site. The 252
cubic meters of storage per hectare (3,600 cubic
feet of storage per acre) drained does not apply to
flows from offsite areas and flows from onsite areas
that are either undisturbed or have undergone final
stabilization where such flows are diverted around
the sediment basin. For drainage locations which
serve a disturbed area of 4 or more hectares (10 or
more acres) at one time and where a temporary
sediment basin providing 252 cubic meters of storage
per hectare (3,600 cubic feet of storage per acre)
drained, or equivalent sediment controls, is not
attainable, sediment controls are required for all
SECTION 01356A
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