HomeMy WebLinkAboutErosion & Sediment Control Report
D
D
D
D
D
D
D
o
o
D
D
D
D
D
o
D
o
o
D
MUELLER PROPERTY NORTH
SAND AND GRAVEL OPERATION
EROSION AND SEDIMENT CONTROL REPORT
PREPARED FOR
MARTIN MARIETTA MATERIALS, INC.
PREPARED BY
SKELLY AND LOY, INC.
ENGINEERS-CONSULTANTS
JANUARY 2005
o
o
o
10
D
!
to
D
o
D-
O
:0
10
o
10
o
o
D
o
o
MUELLER PROPERTY NORTH
SAND AND GRAVEL OPERATION
EROSION AND SEDIMENT CONTROL REPORT
PREPARED FOR
MARTIN MARIETTA MATERIALS, INC.
1980 EAST 116TH STREET, SUITE 200
CARMEL, INDIANA 46032
PREPARED BY
SKELLY AND LOY, INC.
ENGINEERS-CONSULTANTS
2601 NORTH FRONT STREET
HARRISBURG, PENNSYLVANIA 17110
JANUARY 28,2005
1602227
'0
o
D
o
o
o
o
o
o
o
o
o
o
o
D
o
U
'w
U
TABLE OF CONTENTS
PAGE
1.0 INTRODUCTION ................................................... 1
2.0 EXISTING VEGETATION AND SITE CONDITIONS.. ................... ... 1
3.0 EXISTING AND PROPOSED CONTOURS AND DRAINAGE PATTERNS ....... 1
4.0 TEMPORARY SEEDING ....................... . . . . . . . . . . . . . . . . . . . . .. 2
5.0 PERMANENT SEEDING ............................................. 3
6.0 MUELLER PROPERTY NORTH SAND AND GRAVEL OPERATION EROSION
AND SEDIMENT CONTROL PLAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4
6.1 PERIMETER SEDIMENT CONTROL MEASURES ................... 4
6.2 PERMANENT EROSION AND SEDIMENT CONTROL MEASURES . . . . .. 6
6.3 SPECIFIC SEEDING INFORMATION....... ...................... 6
6.4 CONSTRUCTION SEQUENCE .................................. 7
- i -
o
o
Q
o
o
o
o
o
o
o
o
o
D
o
Q
o
D
o
o
LIST OF APPENDICES
APPENDIX A - DETAILS
APPENDIX B - SUPPORTING CALCULATIONS
APPENDIX C - MAPS
MUELLER PROPERTY NORTH SAND AND GRAVEL OPERATION
DRAWING 1 - EROSION AND SEDIMENTATION CONTROL PLAN DURING
MINING OPERATIONS
DRAWING 2 - EROSION AND SEDIMENTATION CONTROL AND PLANTING
PLAN - POST-MINING
DRAWING 3 - CROSS SECTIONS
-ii-
10
o
o
o
o
o
o
o
D
o
o
o
o
o
o
o
o
o
o
MARTIN MARIETTA MATERIALS
MUELLER PROPERTY NORTH
EROSION AND SEDIMENT CONTROL REPORT
1.0 INTRODUCTION
This report addresses erosion and sediment control for Martin Marietta Materials' (Martin
Marietta's) proposed Mueller Property North Sand and Gravel Operation. The surface sand and
gravel extraction will be located on a portion of a 1 05.981-acre tract north of 106th Street between
Gray Road and Hazel Dell Parkway in the City of Carmel, Hamilton County, Indiana.
All ero~ion and sediment control measures and procedures have been designed in
accordance with the erosion and sediment control guidelines contained in the Indiana Handbook
for Erosion Control in Develooina Areas. Erosion and sediment control details are provided in
Appendix A. Note that certain standard details were extracted from the Pennsylvania Erosion and
Sediment Pollution Control Manual when required details were absent from the Indiana Handbook
for Erosion Control in Develooina Areas and when the details contained within the Pennsylvania
Manual were considered to be more appropriate than those in the Indiana Handbook by the design
engineer.
2.0 EXISTING VEGETATION AND SITE CONDITIONS
Mueller Property North is currently an agricultural area with the exception of a small area
where mining occurred previously.
3.0 EXISTING AND PROPOSED CONTOURS AND DRAINAGE PATTERNS
The existing contours, contours during mining, and contours following reclamation for
Mueller Property North are shown on the drawings located in Appendix C. While the site is
relatively flat, runoff on the Mueller Property North generally drains from north to south. Off-site
runoff from other properties onto the subject property is limited; Le, it is either collected and
contained within the existing dredge lake adjacent to the northeastern corner of the subject
property or it is intercepted and redirected by stormwater conveyance facilities north of the site.
- 1 -
10
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
Runoff from the Mueller Property North site is essentially limited to the direct precipitation
that falls on the site itself. The majority of flow from the subject property is expected to be sheet
flow, but there are some areas on the subject property where runoff tends to concentrate. No
perennial streams are present on the subject property.
As stated previously, surface drainage in this area of Mueller Property North is from north
to south. Therefore, it is remotely possible, despite the flat topography of the area, for a small
amount of surface runoff from the area between the residential properties to the north/northwest
of the project area ("Kingswood Subdivision") and the proposed northern berm along the northern
limit of extraction to flow south and collect along this northern berm. If needed, a culvert or series
of culverts through the northern berm will be installed to convey any collected runoff through the
berm and into the mining area in order to maintain the existing drainage patterns. If that becomes
necessary, vegetated channels shall be provided as needed to direct flow into the culverts.
Immediately as overburden removal commences on Mueller Property North, the removal
of the overburden material will lower the affected area below the elevation of the surrounding
ground, which will contain any potentially sediment-laden runoff within the affected area. The
mined area creating the dredge lake will be lower than the surrounding topography, and drainage
from the surrounding areas will flow back into the lake created by mining.
Until the time that overburden removal creates a ground surface below the elevation of the
surrounding existing ground and drainage is contained in the depression created by overburden
removal, drainage will generally flow from north to south on the property. Therefore, an interceptor
channel has been designed for construction along the north side of the proposed berm along 106th
Street to direct runoff back into the existing lake at Carmel Sand Plant. Any direct precipitation that
falls between the channel and berm will be clean since this area is not to be disturbed and will be
vegetated. This clean runoff will exit the site through a series of three openings in the berm until
surface runoff is contained within the extraction area. These openings are located where current
surface runoff exits the site and are further described in Section 6.1 of this report.
4.0 TEMPORARY SEEDING
No temporary seeding is planned. The initial seeding application should be the final
seeding. The use of the permanent seeding mixture in place of temporary seeding will eliminate
the need to seed twice. Seeding growth will be monitored to assure that a sufficient cover is
established and that it is adequately controlling erosion. If it is not, additional seed will be applied.
- 2 -
o
D
o
o
o
o
o
o
o
10
I
o
o
o
o
o
D
o
o
o
However, in the event that temporary seeding becomes desirable due to weather conditions
or other factors, temporary seeding mixtures are provided below. Temporary seeding will be used
to reduce erosion and sedimentation by stabilizing disturbed areas if such areas will be dormant
for a period of 15 days. Temporary seeding specifications were obtained from the Indiana
Handbook for Erosion Control in Developing Areas and seed should be applied as follows.
SEED SPECIES RATE/ACRE PLANTING DEPTH OPTIMUM DATES
Wheat or rye 150 Ibs. 1 to 1 'Y2 in. 9/15 to 10/30
Spring oats 1 00 Ibs. 1 in. 3/1 to 4/15
Annual ryegrass 401bs. 1/4 in. 3/1 to 5/1; 8/1 to 9/1
German millet 401bs. 1 to 2in. 5/1 to 6/1
Sudangrass 351bs. 1 to 2 in. 5/1 to 7/30
Perennial species may be used as a temporary cover, especially if the area to be seeded
will remain idle for more than a year. Fertilizer as recommended by a soils analysis will be applied.
In the absence of soil test results, the Indiana Handbook recommends that 12-12-12 fertilizer or
equivalent be applied at a rate of 400 to 600 pounds per acre (Ib/ac.). Mulching with clean grain
straw or hay at rate of 1.5 to 2 tons per acre to protect seedbed and encourage plant growth will
be applied. Alternate mulching materials may be utilized as specified in the Handbook for Erosion
Control in Developina Areas.
5.0 PERMANENT SEEDING
Permanent seeding will be provided on all disturbed areas, such as berms, that are not
active mining areas. Selected areas that will serve as screening areas, berms, and/or planting
areas are to be seeded with domestic grasses ("No.18 Mix, Wear and Tear") and warm season
(prairie) grass seeding, as indicated on the Erosion and Sedimentation Control and Planting Plan-
Post Mining, located in Appendix C. Seeding mixtures and specifications for those two seeding
mixes are provided on the plans. All disturbed areas will have a minimum of six inches of topsoil
spread before permanent seeding.
All other disturbed areas, including former agricultural areas that have not yet been mined
and berms, shall be seeded with a permanent seeding mixture. The permanent seeding shall be
- 3-
o
o
o
o
o
o
o
o
o
o
o
o
o
D
D
o
o
o
D
"No.18 Mix, Wear and Tear," as produced by the Indiana Seed Co. This mixture consists of 25%
Omni perennial ryegrass, 20% Penguin perennial ryegrass, 20% SR 4200, and 35% Kentucky
bluegrass. This seed shall be applied at a rate of approximately 200 pounds per acre (Ib/ac). This
mix shall be fertilized with 14-26-10 fertilizer applied at a rate of 220 Ib/ac. Lime shall be applied
prior to seeding if soil test results indicate that the pH of the soil is not suitable for the success of
the seed mix. Mulch of clean grain straw or hay shall be applied at a rate of 1.5 to 2 tons per acre
or alternate approved mulching material shall be utilized.
Future seed and fertilizer types and application rates will be as described above, unless
they prove unsuccessful or the Hamilton County Soil and Water Conservation District recommends
an alternative. Lime addition is not anticipated.
6.0 MUELLER PROPERTY NORTH SAND AND GRAVEL OPERATION EROSION AND
SEDIMENT CONTROL PLAN
The proposed Mueller Property North Sand and Gravel Operation will be generally located
between Hazel Dell Parkway and Gray Road on the north side of 106th Street. Sand and gravel
extraction will occur using a suction dredge on a portion of a 1 05.981-acre tract for which special
use approval is being sought. Mining activities will result in the creation of an artificial lake.
6.1 Perimeter Sediment Control Measures
Erosion and sediment control will be needed during overburden removal and while the
earthen berms are constructed. Because of the flat site topography, off-site runoff will primarily be
via sheet flow. If conditions dictate, erosion and sediment control measures will be installed in the
areas where runoff may tend to accumulate before leaving the site (near the southern property
boundary along 106th Street) to prevent sediment from leaving the site. An interceptor channel
will be constructed along the southern property boundary (north of the berm) which will direct
surface water runoff into the existing Carmel Sand Plant lake. A vegetative filter strip will intercept
any direct precipitation in this area. The resulting runoff will exit the site through a series of gaps
in the berm. The channel may be constructed in phases as overburden removal progresses.
Eventually, the channel will extend to the western border of the limit of mining. As extraction
progresses and a lake is established in the permit area, mining will remove the channel, and runoff
will be contained in the lake. These features are indicated on Drawing 1 , Erosion and Sedimenta-
- 4-
o
o
o
D
o
o
o
o
o
D
o
o
o
o
o
o
o
o
o
tion Control Plan During Mining Operations. These controls will be installed prior to earth
disturbance in the area that contributes drainageto the structures. Mining activities will ultimately
progress to a point where all runoff is intercepted by the dredge lake, and these temporary controls
will no longer be necessary. Details for the erosion controls are provided in Appendix A.
The construction and stabilization of berms will also serve as a perimeter control measure
to contain runoff within the subject property and affected areas until the affected areas are below
the original ground level. The berms will be constructed from overburden removed prior to sand
and gravel extraction. A permanent earthen berm will be constructed on the north side of 106th
Street on the subject property. Temporary berms will be constructed along the northern and
western limits of extraction. An existing berm along Hazel Dell Parkway will be extended to the
south. The berms will be seeded (temporary or permanent depending on the weather) immediately
upon completion. If necessary, silt fence will be installed on berm outslopes until they are stabilized
with vegetation.
During construction of the berms, the topography of the site should direct surface runoff
from the majority of the berms into the proposed extraction area where it will be contained within
the site. Installation of the previously mentioned interceptor channel will further serve to prevent
sediment from leaving the site. However, if needed, silt fence or other protective measure may be
installed along the outslopes of the berms along 106th Street, along the western and northern
property boundaries, and along Hazel Dell Parkway to prevent sediment from leaving the site.
Overburden not used for berm construction will be sold or stored at the adjacent Carmel Sand
Plant.
The proposed reclamation activities include the removal of selected portions of the berms
that will be in place during mining operations and extension of selected portions of the berms. The
berms along the northern and western limits of extraction will be removed when all sand and gravel
operation on the subject property is complete, and any culverts used to convey stormwater under
the northern berm will also be removed. Portions of the southern berm along 106th Street will be
left open during initial mining activities to allow drainage to exit the site. Erosion and sediment
control during removal of the berms will consist of seeding. Silt fence or other measures may be
used as needed during these earth disturbance activities to prevent sediment flow to adjacent
properties. Runoff from the areas of berm to be removed will flow into the dredge lake where it will
be retained. Soil remaining from the temporary berms will be used to achieve the reclamation
slopes, sold, or deposited in the dredge lake.
- 5 -
10
o
D
o
o
o
o
o
D
o
o
o
o
o
o
D
o
o
o
As stated previously, the seeding of the berms is the major permanent erosion control
measure that will be implemented. Measures will be taken to control erosion and off-site drainage
while overburden is being stripped. After the overburden is stripped, runoff from the affected area
will be directed back to the lake where mining is occurring or has occurred. The fact that the
affected area will be lower than the surrounding undisturbed topography will naturally prevent off-
site runoff.
6.2 Permanent Erosion and Sediment Control Measures
The permanent erosion and sediment control measures will consist of permanent seeding,
as described in the preceding section of this narrative, and stabilization of the lake inslopes. Rock
lining of the inslopes of the dredge lake is proposed in place of vegetative stabilization, as
vegetative stabilization may be difficult due to fluctuating water levels. Due to fluctuating water
levels following mining, which are expected to vary a maximum of 5 feet between the expected high
water and the expected low water elevation, a rock lining that extends a distance of 2.5 feet above
and below the normal water elevation for a total vertical distance of 5 feet is proposed. The area
being proposed for rock lining is indicated on Drawing 2, Erosion and Sedimentation Control and
Planting Plan - Post-Mining.
6.3 Specific Seeding Information
Prior to mining activities, a vegetative cover will be established on dormant cropland. The
vegetative cover will not consist of weeds. All dormant cropland areas within the limit of extraction,
within the areas of future berm construction, and within the setback or buffer that do not have a
vegetative cover consisting of vegetation other than weeds will be seeded with either the
permanent or the temporary seeding mixture. The decision as to which mixture to use is described
previously.
As mining activities commence, several areas of the site, including the 300-foot buffer and
portion of the berm along 106th Street, are to have trees planted or prairie or domestic grass seed
applied. The areas of seeding are indicated on Drawing 2. Seed will be applied as soon as final
grade that occurs during mining operations is attained in these areas.
- 6 -
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
I 0
o
ID
In all other disturbed areas, permanent seeding will be applied as soon as final grade
(during mining operations) is attained. These other disturbed areas include the proposed berm
areas, where vegetative stabilization of the berm is a perimeter control measure.
Rock lining of the inslopes of the dredge lake is proposed in place of vegetative stabilization.
Vegetative stabilization may not be effective in this area due to fluctuating water levels. The area
of rock stabilization is shown on Drawing 2.
6.4 Construction Sequence
1. Prior to earth disturbance activities, appropriate erosion and sedimentation controls will be
in place to prevent sediment from leaving the subject property.
2. Seed any former cropland areas that do not have a permanent dense vegetative cover.
3. Install interceptor channel downslope of areas to be stripped. Interceptor channel will be
extended as overburden stripping progresses.
4. Commence overburden removal.
5. Concurrent with the beginning of overburden removal, commence construction of the berm
along 106th Street to provide a sediment barrier. This berm should be seeded (temporary
or permanent depending on the weather) immediately upon completion. Silt fence will be
installed, if necessary, until berm outslopes are stabilized.
6. Continue overburden removal activities.
7. Seed all berms and other affected areas that are not active mining areas as soon as final
grade is attained.
8. Temporary erosion and sediment controls, such as the channels and silt fences, will remain
in place until the contributing drainage areas are stabilized. These controls may be
removed after the upslope areas are vegetated or the drainage area is eliminated by the
progression. of mining activities.
9. Concurrent with reclamation sloping and grading activities, install rock stabilization along
the lake water level.
- 7 -
o
,D.
I, .\
o
o
. ". .f.'
o
a'
.w
o
a
o
D
0','
..
0,'
APPENDICES
',\!
o
:0
,'".'t-:
"0"'
D.
';0
~ -:,
:-. ,
o
D'
" "..
D
,'Q
D
,0
O~.
, '."
'.. '
u
D
iD'.'
0'
u
'Q
p
D
.,. )
, . ." ~
,0
o
"',
/'
'. .
/
" '
. ,'~.
:', ",:
"'.
, "J
....APPENDIX'A
. ,DETAILS
"<-,(
II
o
~
o
'0
o
D
D
o
o
[)
o
o
o
o
o
o
J /~
Purpose
(Exhibit 3.3J-A)
· To carry concentrated runoff from a small watershed area to a stable outlet without damage from
erosion or flooding.
Exhibit 3.31-A.. Erosion control blankets provide the bed for this grass-lined channel; however, the utility box
is poorly located.
Requirements
(Exhibit 3.3J-B)
Capacity: Peak mnofffrom 10-yr. frequency, 24-hr. duration stonn event.
Cross section: Parabolic or trapezoidal.
Grade: Generally restricted to slopes S% or less.
Side slopes: Generally 3:1 or flatter to establish and maintain vegetation and facilitate mowing.
Channel size: As specified in construction plans.
Channel stabilization: Through use of erosion control blankets, turf reinforcement mats (Practices
3.17 and 3.18) or other appropriate practices. NOTE: Unanchored mulch is generally not effec-
tive in stabilizing channels with concentrated flow (see Exhibit 3.3J-B).
Outlet: Stable; channels carrying sediment should empty into sediment traps or basins.
Drainage tile: May be needed if channel is in an area having a seasonal high water table or seep-
age problems.
Exhibit 3.31-8. Because the straw mulch was not anchored in this channel, erosion and cutting occurred.
3.31-1
10
Installation
0 (Exhibit 3.31-C)
0
0
'0
0
0
0
0
0
0 Maintenance
0
0
Common
0 concerns
0
0
0
0
3.31-2
0
1. Install sediment traps or basins in contributing drainage area if needed (practices 3.71,3.72).
2. Remove brush, trees, and other debris from the foundation area and dispose of properly.
3. Excavate and shape the channel to dimensions shown on the design. removing and properly dis-
posing of excess soil so that surface water can enter the channel freely.
4. If drainage tile is needed, install it offset to one side of the channel, not in the center. (Neither
should utility lines be installed near the channel bottoms.)
5. Protect all concentrated inflow points along the channel with erosion-resistant linings, riprap,
sod, or other appropriate measures.
6. Add topsoil where the soils exposed during excavation would be unsuitable for grass species.
7. Seed or sod the channel immediately after grading (practice 3.12), and protect with erosion con-
trol blankets or turf reinforcement mats (practices 3.17 and 3.18) (see Exhibit 3.31-C).
8. Stabilize outlets during channel installation (practices 3.41, 3.42, 3.43).
Exhibit 3.31-C. Installation of erosion control blankets In a channel next to a highway.
* Inspect the channel following storm events during and even after vegetative establishment; make
needed repairs immediately.
* Check the channel outlet and road crossings for blockage, sediment, bank instability, and piping
or scour holes; remove any blockage, and make repairs immediately.
* Remove significant sediment and debris from the channel to maintain design cross section and
grade and to prevent spot erosion.
Erosion occurs in channel before vegetation fully established-repair, reseed, and install erosion
control blankets and turf reinforcement mats (practice 3.17 and 3.18)
Gullying or head cutting in channel-grade is too Sleep for a grass lining, so redesign the channel
and utilize erosion-resiSlaDt lining.
Side slope caving-results from any of the following: (1) channel was dug in unstable, high-water-
table soil, (2) banks are too Sleep for site conditions, or (3) velocity is too high, especially on the
outside of channel curves.
Overbank erosion, spot erosion, channel meander, or flooding-remove accumulated debris and
sediment, and stabilize and revegetate trouble spots. (Riprap or other appropriate measures may
be required.)
Ponding along channel-the approach is not properly graded, or surface inlets are blocked.
Erosion at channel outlet-install an outlet stabilization structure (practices 3.41, 3.42, 3.43).
Sediment deposited at channel outlet-indicates channel or watershed erosion. Find and repair the
source of any channel erosion, stabilize the watershed, or install temporary diversions and sedi-
ment traps to protect the channel from sediment-laden runoff (practices 3.21,3.71,3.72).
Gullying or settling in channel-tile was inSlalled in the center of the channel, not o:fJto the side.
aid-.
.
.
.
10
o
o
o
o
10
o
o
o
D
D
o
o
o
o
o
o
o
o
~~
STANDARD CONSTRUCTION DETAil #1
Vegetated Channels
'.I(~
LINING INSTAllATION
L1NING*
B
CHANNEL CROSS-SECTION
CHANNEL
NO.
BOTTOM
WIDTH
B
(FT)
4
LINING.
GRASS
DEPTH
D
(FT)
2.5
Z1
(FT)
3
Z2
(FT)
3
* See Manufacturer's Lining Installation Detail for Staple Patterns, and Vegetation Stabilization
Specifications for Soil Amendments, Seed Mixtures, and Mulching information.
\/UJl1tdL wlm Un~ BII.H.~(lLf.s Onq/or jail Ft~uu.
o
o
~
o
o
o
o
o
o
~
o
o
o
o
o
o
o
~
o
'/'f.
Purpose
(Exhibit 3. 74-A)
· To retain sediment from small, sloping disturbed areas by reducing the velocity of sheet flow.
(NOTE: Silt fence captures sediment by ponding water to allow deposition, not by filtration. Al-
though the practice usually works best in conjunction with temporary basins, traps, or diversions,
it can be sufficiently effective to be used alone. A silt fence is not recommended for use as a di-
version~ nor is it to be used across a stream, channel, or anywhere that concentrated flow is antici-
pated.)
Elhibit 3.74-A. This siit fence protects the street from sediment. The last section of fence is angled toward
the vacant lot to prevent runoff from bypassing the fence.
Requirements
(Exhibits 3. 74-B
and C)
Drainage area: Limited to 1/4 acre per ]00 ft. offence; further restricted by slope steepness (see
~hibit3.74-B).
Location: Fence nearly level, approximately following the land contour, and at least 10 ft. from toe
of slope to provide a broad, shallow sediment pool.
Trench: 8 in. minimum depth, flat-bottom or V-shaped, filled with compacted soil or grave] to
bury lower portion of support wire andlor fence fabric.
Support posts: 2 x 2-in. hardwood posts (if used) or steel fence posts set at]east I ft. deep.. (Stee]
posts should have projections for fastening fabric.)
Spacing of posts: 8 ft. maximum iffence supported by wire,
6 ft. for extra-strength fabric without wire backing.
Fence heigbt: High enough so depth of impounded water
does not exceed I Y2 ft. at any point along fence line.
Support wire (optional): 14 gauge, 6-in. mesh wire fence
(needed ifusing standard-strength fabric).
Feoce fabric: Woven or non-woven geotextile fabric with
specified filtering efficiency and tensile strength (see Ex-
hibit3.74-C) and containing UV inhibitors and stabilizers
to ensure 6-mo. minimum life at temperatures OO-120oF.
Elhiblt 3.74~. Maximum Land
Slope and Distance for Which a
Silt Fence Is Applicable.
Land slope
Max. distance
above fence
Less than 2%
2 to 5%
S to 10%
10 to 20%
More than 20%
100ft.
75ft.
50ft.
2S ft.
IS ft.
. Some convnercial silt fences come ready to install, with suppon posts at.
tached and req\liring DO wire support.
3.74-1
10
o
o
o
o
o
2/4
Exhibit 3.74-C. Specifications Minimums for Silt Fence Fabric.
Ph)'sical property
Wo"en fabric
Non-woven fabric
.
Outlet (optional): To allow for safe stonn flow bypass with-out overtopping fence (see Exhibit
3.74-D). Placed along fence Jine to limit water depth to 1 Y2 ft. maximum; crest-l ft. high maxi-
mum; weir width--4 ft. maximum; splash pad-S ft. wide, S ft. long, 1 ft. thick minimum.
o
o
o
o
o
o
o
o
o
o
o 3.74-2
Filtering efficiency
Tensile strength at
20% elongation:
Standard strength
Extra strength
Slurry flow rate
Water flow rate
UV resistance
85%
85%
o Installation
(Exhibits 3. 74-D,
o E. andF)
30 Ibs./Iinear in.
50 lbs./Iinear in.
0.3 gal.lmin.lsq.ft.
15 gal .Imin.lsq.ft.
70%
50 Ibs./Iinear in.
70 lbs./Iinear in.
4.5 gal.lmin.lsq.ft.
220 gal.lmin.lsq.ft.
85%
SITE PREPARATION:
1. Plan for the fence to be at least 10 ft. from the toe of the slope to provide a sediment storage area.
2. Provide access to the area if sediment cleanout will be needed.
OUTLET CONSlRUCTlON (OPTIONAL) (see Exhibit 3.74-D):
1. Determine the appropriate location for a reinforced, stabilized bypass flow outlet (unless the
fence is designed to retain aU runoff from a 2-yr. frequency, 24-hr. duration storm event).
2. Set the outlet elevation so that water depth cannot exceed 1 \/2 ft. at the lowest point along the
fence line.
3. Locate the outlet weir support posts no more than 4 ft. apart, and install a horizontal brace be-
tween them. (Weir height should be no more than than 1 ft. and water depth no more than 1 Y2 ft.
anywhere else along the fence.)
4. Excavate the foundation for the outlet splash pad to minimums of 1 ft. deep,S ft. wide, and 5 ft.
long on level grade.
5. FiJI the excavated foundation with lNDOT CA No. 1 stone, being careful that the finished sur-
face blends with the sunounding area, allowing no oven all.
6. Stabilize the area around the pad.
.
Exhibit 3.74.0. Overflow weir for . silt fence outlet.
I
10
o
o
o
o
o
o
o
o
~
W
U
Q
~
q
q
o
Ct
Q
3/~
FENCE CONSTRUCTION (see Exhibit 3. 74-E):
1. Along the entire intended fence line, dig an 8-in. deep flat-bottomed or V-shaped trench.
2. On the downslope side of the trench, drive the wood or steel support posts at least 1 ft. into the
ground (the deeper the bener!), spacing them no more than 8 ft. apart if the fence is supported by
wire or 6 ft. if e>.1ra-strength fabric is used without support wire. Adjust spacing, if necessary, to
ensure that posts are set at the low points along the fence line. (NOTE: If the fence has pre-at-
tached posts or stakes, drive them deep enough so the fabric is satisfactorily in the trench as de-
scribed in Step 6.)
3. Fasten support wire fence (if the manufacturer recommends its use) to the upslope side of the
posts, extending it 8 in, into the trench.
4. Run a continuous length of geotextile fabric in front (upslope) of the support wire and posts,
avoiding joints, particularly at low points in the fence line.
5. If a joint is necessary, nail the overlap to the nearest post-with lath (see Exhibit 3. 74-F).
6, Place the bottom 1 ft. offabric in the 8-in. deep trench, extending the remaining 4 in. toward the
upslope side.
7, Backfill the trench with compacted earth or gravel.
NOTE: If using a pre-packed commercial silt fence rather than constructing one, follow manu-
facturer's installation instructions.
, Support wire
Finer fabric -...
~ Slope Compacted
~- soli \
~m~~ A ~'::::;/:'.
1/!=I.illI=U!!1== ':.:::-:-.::: .
.OjI=lffi=11I18!", :'.: -:.;:';~
-= -:;i1iTE (mln,) '.; ':'. :'; ':
'"=:11\\ :.:::'.:; .
- ".......
-:. -!... '.1 ..-,
\~4In,~
Exhibit 3.74-E. Detailed example of sib fence installation (showing f1at-bottom and V-shaped trenches).
Exhibit 3.74.f. Detail of a sib fence joint.
Maintenance '" Inspect the silt fence periodically and after each storm event.
"'Iffence fabric tears, starts to decompose, or in any way becomes ineffective, replace the affected
portion immediately.
3.74-3
10
0
0
~ommon
oncerns
(Exhibit 3. 74-G)
0
10
0
0
0
0
0
0
0
0
0
0
0
0
0 3.74-4
Jf{If
... Remove deposited sediment when it reaches half the height of the fence at its lowest point or is
causing the fabric to bulge.
... Take care to avoid undennining the fence during clean out.
... After the contributing drainage area has been stabiliz.ed, remove the fence and sediment deposits,
bring the disturbed area to grade, and stabilize.
.
Fence sags or collapses-because drainage area was too large, too much sediment accumulated be-
fore cleanout, approach slope was too steep, or the fence was not adequately supported.
Fence undercut or blown out at tbe bottom by excessive runofT--because the fence bottom was not
properly buried at aIJ points, the trench was not backfilled with compacted earth or gravel, the
fence was installed on excessive slope, or the fence was located across a drainageway.
Fence overtopped--because the sediment storage area was inadequate, no provision was made for
safe bypass of stonn flow, or the fence was located across a drainageway.
Erosion occurs around end of fence-because the fence tenninated at an elevation below the top of
the sediment storage pool, the fence tenninated in an unstabilized area, or the fence was in-
stalled on excessive slope.
Dense soil layers exposed by excnatioo or caused by equipmeot compaction---c8use difficulty in
driving wooden posts to sufficient depth; solve by using steel posts.
.
.
Exhibit 3.74-6. Concentrated flow and excessive drainage arel CIUSed these silt fences to fall
0,.
I
I', .
i.D.
'0
,D
D
D
II D
..0
'D .
. .'
" ,-
,::- ,,'
.D
D
D';.
;Q,
D
D'
','
.',
,),'
A'PPENDIX,13 .
:SUP,POflTING"CA'LCU'LATIONS.
: ,
~D'"
. .
D,
0:
, ,~l.
Computed by
M~5
Checked by
Job No. IlLOJ~a f
Sheet No. -L of ~
Drawing No.
Date I / 1 /0 5
OSKELL'V Ao.N1~L~'V. INlC.
EI'IGlINEERS. CON&UL"TA"'-ITS
Subject
M~ UAffr/e#ti
/vi upJfpf If/~r#.. UlUUUIPJ
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
,0
i
D
:0
2601 NORTH FRONT STREET
HARRISBURG,PENNSYLVANIA 17110
(717)232.()593. 800-892~
FAX (717) 232-1799
. dJ...J- ':i) k II
!tJ-'jettr ~.e~ T 10 c .,. ~
~1UtL.e-. fd-Se, ~ c- :t rr I/Pp-~f'( e&-n.d~
_ 1000 ,
S - ~ -10 =-1-63 (L.. ::: O.d S :=: D.33'
)~ 1
Cl- (p-~.~ (/L,-z,.-(),'2.X/-63) 7 It
tx- == ..,-, ::: 0< R
f' .{-O. g s - 1f,2-../-"'~ x /.03 -
/A&e. a~ p~ J)'~~e ~uI ~ eJ#r't1A1I€ ~ fULl.? oI~e )\v..--~ ~/.
CN~'86
~ " ~F ~ , ~. ~.sj ~/(){f rfrr+At ftIM- ~f~ ~1l:Fe.
e.g
"fW f,....;. T -i ~ b,oo 7 (" t.. ) _
r~.'> s'" 'I-
{J.oo7 (~.IS x5tJ )f). 8
=:-0./7 hr
~.1e,5' x o,as 0.1/-
5 Jv;.u ()1;J t&111-afr~J few
()
$= o'5j' 1J- -:;.~, S -f(f/6
L~ 7~O
. 7~()
It; ~ o.s X 36~1J
:: (),39 Al"
~fI~
~ s{ppe S::(),7J
L~~50(?'
e-s41Mtif-f ftuJ u.e181lA~ d6 5<</-5 '1r~~
'Tt-=-
d 5tJO
5 x3600 - o./tthr
~. co 0./7+ 1J,~Cf +O.llf ~o'7 hr
( !u ~ 'f5{) ~m;/,'., .
k/ ~-.; 3
7(>:: tf.~ c~. t?%
A -:;;;. qa. Ilk- :::: 0.066 m;~
/II
6r ~ &-(.(4m Q ::: 450)( 0.066 X 0<-7<< = ~.g bfs .
o
o
D
o
o
D
o
o
D
D
o
o
o
o
o
o
o
o
o
E&S Control Channel
Worksheet for Trapezoidal Channel
Project Description
Project File
Worksheet
Flow Element
Method
Solve For
untitled .fm2
channel
Trapezoidal Channel
Manning's Formula
Discharge
Input Data
Mannings Coefficient
Channel Slope
Depth
Left Side Slope
Right Side Slope
Bottom Width
0.030
0.007000 fUft
1.87 ft
3.000000 H : V
3.000000 H : V
4.00 ft
Results
Discharge
Flow Area
Wetted Perimeter
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific. Energy
Froude Number
Flow is subcritical.
01/07/05
10:32:36 AM
81.05 cfs
17.97 ft2
15.83 ft
15.22 ft
1.60 ft
0.013633 tuft
4.51 tus
0.32 ft
2.19 ft
0.73
Haestad Methods. Inc. 37 Brookside Road Waterbury, CT 06708 (203) 755-1666
FlowMaster v5.15
Page 1 of 1
o
'\',
'<y';
<
.:"'0' '.
I. "
I
i' .'
1.....0
I
1<
10
'\,
.~ "
0;;,
I."
Dr
'.'0--
. .
," "
":0'
/"
.0'
'D'
o
,!
':,"
" ,. '
. .
'APPENDIX~'C ~
MApS
,D.
D.
r.
D~,'
"
D'