EROSION CONTROL EVALUATION

trextemperMechanics

Feb 22, 2014 (3 years and 4 months ago)

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Project ID# _____________



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EROSION CONTROL

EVALUATION

Wisconsin Department of Transportation

Factor Sheet D
-
6


Alternative

Alternative 3
-
4
-
4

Total Length of Center Line of Existing Roadway
6.21 miles

Length of This Alternative
6.03 miles

Preferred


Yes

No

None identified



1.


Give a brief description of existing and proposed slopes in the project area, both perpendicular and
longitudinal to the project. Include both existing and proposed slope length, percent slope and soi
l types.


Existing
-

Roadway and paved shoulders have 2% cross slope, gravel shoulders have 4%
-
6% cross slope, and slope
to ditc
h line varies from 1:1 to 6:1 with the majority being 3:1.


Ditch slopes vary between 0.5% and

8.0%.



Proposed
-

Roadway

and pave
d shoulder
s

will have

2%
cross
slope, gravel shoulder
s

will have 4
%
cross
slope. A 6:1
slope to the ditch line with a 6
-
foot flat bottom ditch and 4:1 back slope is typical. There are some areas that have a
4:1 slope after the clear zone in order to minim
ize right of way impacts. In areas of significant cut, the back slope will
be as steep as
2.5
:1
.


The majority of the ditch slopes are between 0.5% and 4
.0
%.
There is a section in the realignment area where the
roadway abruptly transitions from a deep f
ill to a deep cut, where the ditch grade will have 9%

average slope over 400
feet on
both sides of the roadway. There is also a section approaching the bridge over Honey Creek that has a 5%
ditch slope for 400 feet on both sides of the roadway. These

are
a
s

will require appropriate erosion contro
l devices to
prevent scouring of the soil in the flow line.
Coordination with the
WisDNR

and DOT environmental unit will take place
to determine acceptable erosion control used during construction and permanently.


Soil Types


According to soil mapping information the predominant soil
types on this project are

Fox soils

that consist
of

loam, sandy loam, and silt loam.



2.

Indicate all natural resources to be affected by the proposal that are sensitive to erosion,
sedimentation, or
waters of the state quality degradation and provide specific recommendations on the level of protection
needed.


No
-

there are no sensitive resources affected by the proposal.


Yes
-

Sensitive reso
urces exist in or adjacent to the area affected by the project.



River/stream






Lake






Wetland




Endangered species habitat







Other
-


Describe
_________________________________


Appropriate erosion control measures will be used to protect adjacent natural resou
rces against sediment transport
during and after construction. Spring Creek is currently classified as an Impaire
d Water by the
WisDNR

due to

high

turbidity and sedimentation caused by the surrounding land uses. The erosion control for the

roadway

project w
ill be
designed to protect Spring Creek from furt
her erosi
on related degradation arising from storm water runof
f from within
the right of way.



3.

Are there circumstances requiring additional or special consideration?


No
-

Additional or special circumstances are not present.


Yes
-

Additional or special circumstances exist. I
ndicate all that are present.



Areas of groundwater discharge




Overland flow/runoff





Long or steep cut or fill slopes



Areas of groundwater recharge (fractured bedrock, wetl
ands, streams)




Other
-

Describe any unique or atypical erosion control measures to be used to manage additional



or special circumstances
_________________________________


Project ID# _____________



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4.

Describe overall erosion control strategy t
o minimize adverse effects and/or enhance beneficial effects.


Erosion control plans will be developed to limit offsite sedimentation that may cause damage to the surrounding
environment, and to comply with all applicable laws and regulations. Further coo
rdination with the
Wis
DNR

and the
WisDOT
storm water unit will take place to develop an effective combination of erosion controlling devices manage
sedimentation from the project.
The focus of the plan will be to reduce overland and channelized flow veloc
ities to
prevent erosion and transportation of sediment along the project.



5.

Erosion control measures reached consensus with the appropriate authorities as indicated below:



WisDNR



County Land Conservation Department



American Indian Tribe



US Army Corps of Engineers


WisDNR and WisDOT have reached a consensus on erosion control measures to this point of the project. WisDOT will
continue to coordinate with WisDNR as the project c
ontinues to final design. Coordination will also continue with
SEWRPC for stream relocations including erosion control measures.


Note: All erosion control measures (i.e., the Erosion Control Plan) shall be coordinated through the WisDOT
-
WisDNR
liaison p
rocess and TRANS 401 except when Tribal lands of American Indian Tribes are involved. WisDNR’s
concurrence is not forthcoming without an Erosion Control Plan. In addition, TRANS 401 requires the contractor to
prepare an Erosion Control Implementation Pla
n (ECIP), which identifies timing and staging of the project’s erosion
control measures. The ECIP should be submitted to the WisDNR and to WisDOT 14 days prior to the preconstruction
conference (Trans401.08(1)) and must be approved by WisDOT before implem
entation. On Tribal lands, coordination for
402 (erosion) concerns are either to be coordinated with the tribe affected or with the U.S. Environmental Protection
Agency (EPA). EPA or the tribes have the 401 water quality responsibility on Trust lands. D
escribe how the Erosion
Control/Storm Water Management Plan can be compatible.




6.

Identify the temporary and permanent erosion control measures to be utilized on the project. Consult the
FDM, Chapter 10, and the Products Acceptability List (PAL).



Minimize the amount of land exposed at one time


Detention basin



Temporary seeding






Vegetative swales



Silt fence







Pave haul roads



Ditch checks






Dust abatement



Erosion or turf reinforcement mat




Rip rap



Ditch or slope sodding





Buffer strips



Soil stabi
lizer






Dewatering


Describe method



Inlet protection






Silt screen



Turbidity barriers






Temporary diversion channel



Temporary settli
ng basin





Permanent seeding



Mulching



Other
-

Describe _______________________________