FEBRUARY 8, 2011

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FEBRUARY
8
,
201
1

RURAL PLAINS PARKING LOT


312500
-

1


PMIS NO.



EROSION AND SEDIMENTATION CONTROLS

SECTION
312500

EROSION
AND SEDIMENTATION
CONTROL
S



PART 1

-

GENERAL


1.1

DESCRIPTION


A.

This Section specifies requirements for temporary

and permanent

erosion
and sedimentation
control provisions

as they relate to the construction process
.


B.

The work includes:


1.

Providing and maintaining all temporary erosion
and sedimentation
control measures
shown on the Drawings and required by the
Contracting Officer (CO)

during the life of
the Contract to control soil erosion and water pollution.


2.

The
installation and maintenance of additional silt fence, construction exits, catch

basin
filters, mulches, grasses, and other approved erosion control devices or methods, needed
to protect any areas on or off site
.


1.2

RELATED SECTIONS


A.

Sections which directly
relate to the work of this Section include:


1.

Section
313000


EARTHWORK (SITE).



1.3

DEFINITION AND
COORDINATION
OF

EROSION
AND SEDIMENTATION
CONTROL

PROVISIONS


A.

Permanent erosion
and sedimentation
control measures are defined as those elements that are
to be

incorporated into the final project product, including but not necessarily limited to such
items as
:

finish paving and landscape, detention basin forebays, sedimentation control
structures (Voctechnics, Stormceptor, catch basins, etc.), swales and ditches
, berms, and other
such items.


B.

Temporary erosion
and sedimentation
control measures are defined as those elements that are
required by permit approvals and necessary to be installed by the Contractor to meet
fe
deral,
state
and
local
regulations for the
construction program, including, but not necessarily limited
to, such items as
:

silt fences, berms, portable sedimentation basins, hay

bales, check dams,
and other such items, all of which shall be removed by the Contractor after installation o
f

permanent
erosion
and sedimentation
control measures, stabilization of the site, and prior to
final completion of the project.


C.

The temporary control provisions shall be coordinated with the permanent erosion
and
sedimentation
control features to the extent practica
l to ensure economical, effective
,

and
continuous erosion
and sedimentation
control
s

throughout the construction and post
-
construction period
s
.



FEBRUARY
8
,
201
1

RURAL PLAINS PARKING LOT


312500
-

2


PMIS NO.



EROSION AND SEDIMENTATION CONTROLS

1.4

PRIOR TO CONSTRUCTIO
N


A.

Prior to the start of the construction, the Contractor shall submit to the
CO
TR

the fol
lowing
:
schedules for the construction of required temporary and permanent erosion and sediment
control work, clearing and grubbing, grading, structures at watercourses, construction, and
paving. No work shall be started until control schedules and method
s of operations have
been submitted to the
CO
TR
.


1.5

CONSTRUCTION OPERATI
ONS


A.

When
in the opinion of the
CO
TR

it becomes necessary, the
CO
TR

will inform the
Contractor of construction procedures and operations that jeopardize erosion and
sedimentation control provisions. If these construction procedures and operations are not
corrected promptly, the
Owner

may suspend the performance of any or

all construction until
corrections have been made, and such suspension shall not be the basis of any claim by the
Contractor for additional compensation from the Owner nor for an extension of time to
complete the Work.


PART 2

-

PRODUCTS


2.1

MATERIALS


A.

Temporary erosion control seed for quick growing grasses such as wheat, rye or oats shall be
planted only when permanent grasses cannot be planted due to the growing season. All
permanent grass areas planted with temporary erosion control seed shall be re
placed with
permanent seed. Apply seed mixture at a rate of 100 pounds per acre.




Percent

Germination

Seed

Percent by Weight

Minimum




Winter Rye

80 Minimum

85

Red Fescue(Creeping)

4 Minimum

80

Perennial Rye Grass

3 Minimum

90

Red Clover

3 Minimum

90

Other Crop Grass

0.5 Maximum


Noxious Weed Seed

0.5 Maximum


Inert Matter

1.0 Maximum



PART 3

-

EXECUTION


3.1

SILT FENCE


A.

Silt fence shall be installed
at locations
as shown on the Drawings

or along the downhill side
of all land disturbance activities
.


B.

Supporting posts shall be spaced 4 feet on center, and driven at least
1
foot into the ground.
Posts shall be 1
-
1/2

inch square or heavier wood posts or standard steel posts.



FEBRUARY
8
,
201
1

RURAL PLAINS PARKING LOT


312500
-

3


PMIS NO.



EROSION AND SEDIMENTATION CONTROLS

C.

Fabric shall
be anchored in a 4
-
inch deep trench dug on the upslope side of the posts. The
trench shall be at least 4

i
nches wide. The fabric shall be laid in the trench, backfilled
,

and
compacted.


D.

Fabric rolls shall be spliced at posts. The fabric shall be overlap
ped 6 inches, folded over
,

and
then
securely fastened to posts.


E.

Silt fences shall be inspected immediately after each storm event and at least daily during
prolonged rainfall.


3.2

CONSTRUCTION REQUIRE
MENTS

-

TEMPORARY
EROSION AND
SEDIMENT
ATION

CONTROL


A.

The C
ontractor shall construct all permanent erosion and sediment
ation

control features at the
earliest practical time as outlined in the accepted schedule. Temporary erosion and
sediment
ation

control measures shall be used to correct conditions that develop d
uring
construction which were unforeseen, but are needed prior to installation of permanent
erosion
and sedimentation
control features, or that are needed temporarily to control erosion or
sedimentation which develops during construction operations.


B.

Where

erosion is likely to be a problem, clearing and grubbing operations shall be scheduled
and performed so that grading operations and permanent erosion and sediment
ation

control
features can follow immediately thereafter, if conditions permit; otherwise, te
mporary
erosion
and sedimentation
control measures will be required between successive construction stages.


C.

Contractor shall be responsible for controlling erosion within the project area and retaining
sediment on
-
site away from sensitive environmental re
sources. Any fines, construction
delays, remedial actions, or incarceration resulting from the Contractor’s failure to comply
with these provisions shall be the responsibility of the Contractor and not the Owner.


D.

Failure by the Contractor to control eros
ion, pollution, and siltation shall be cause for the
Owner to employ outside assistance to provide the necessary corrective measures. The cost
of such assistance, including engineering costs, will be charged to the Contractor and
appropriate deductions ma
de
from
the Contractor's monthly progress payment.


E.

The Contractor shall remove and properly dispose of sediment from control facilities as
required by the
CO
. The Contractor shall modify and improve erosion and sedimentation
control facilities and replac
e devices as required by the
CO
.


F.



Min
i
mum temporary and permanent erosion and sedimentation control measures are
shown on the Drawings. The Contractor shall strictly adhere to the minimum provisions
shown. Additionally, temporary measures shall be selected and constructed by the Contractor
i
n consultation with the
CO

to accommodate changing field conditions that develop during
construction.


G.

All disturbed areas shall be re
-
vegetated by loaming and seeding unless otherwise noted on
the approved plan.



FEBRUARY
8
,
201
1

RURAL PLAINS PARKING LOT


312500
-

4


PMIS NO.



EROSION AND SEDIMENTATION CONTROLS

3.3

MAINTENANCE OF EROSI
ON
AND SEDIMENTATION
C
ONTROL MEASURES


A.

The Contractor shall check the condition of erosion and sedimentation control devices daily
and maintain them in good operating condition.


B.

The Contractor shall inspect the condition of erosion and sedimentation control devices after
each rainstorm and during major storm events. Repairs shall be made as necessary.


C.

Temporary soil erosion and sedimentation control devices shall be removed and adjacent
areas outside the limits of grading restored upon completion of the work or when requ
ired by
the
CO
.



END OF SECTION
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