USACE / NAVFAC / AFCESA / NASA UFGS-01 57 23 (April 2008)
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Preparing Activity: USACE (CW) Superseding
UFGS-01 57 23 (January 2008)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 01 57 23
TEMPORARY STORM WATER POLLUTION CONTROL
04/08
NOTES: This specification covers the requirements for temporary construction
measures most used in complying with the Best Management Practices of the storm
water pollution prevention plan as required by a NPDES Permit.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
This guide specification includes tailoring options for LANTDIV. Selection
or deselection of a tailoring option will include or exclude that option in
the section, but editing the resulting section to fit the project is still required.
PART 1 GENERAL
NOTE: This guide specification must be tailored to meet the requirements of
the job and of the permitting authority. Individual states may require prevention
measures that differ from the ones specified in this section and, in that case,
this guide specification will be tailored to meet those State requirements.
This guide specification is required for all construction projects that include
disturbing over 2 hectares (5 acres) of land surface area that could be a source
for erosion and sediment pollution due to storm water runoff.
(1) A Notice of Intent (NOI) will be prepared and sent to the appropriate state
licensing office or USEPA Regional Office. At this time, it has not been determined
when to send in the NOI, but it will be done after preparation of a storm water
pollution prevention plan, and perhaps after award of the contract because the
names of the Contractors must be give on the NOI.
(2) After construction is completed, a Notice of Termination (NOT) will be
sent to the state office or Regional USEPA Regional Office.
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[ASTM INTERNATIONAL (ASTM)ASTM D 4439(2004) GeosyntheticsASTM D 4491(1999a; R 2004e1) Water Permeability of Geotextiles by PermittivityASTM D 4533(2004) Trapezoid Tearing Strength of GeotextilesASTM D 4632(2008) Grab Breaking Load and Elongation of GeotextilesASTM D 4751(2004) Determining Apparent Opening Size of a GeotextileASTM D 4873(2002) Identification, Storage, and Handling of Geosynthetic Rolls and Samples][U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)EPA 832-R-92-005(1992) Storm Water Management for Construction Activities Developing Pollution Preventions and Plans and Best Management Practices][U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)40 CFR 122.26Storm Water Discharges (Applicable to State NPDES Programs, see section 123.25)]1.2 SYSTEM DESCRIPTION
NOTE: Current studies indicate contaminants bind to soil particles and can
be carried with the eroded soils into streams. The intent of this specification
is to prevent sediment from entering streams or water bodies adjacent to construction
sites. The Contracting Officer, when necessary, should provide information
to the Contractor emphasizing the need for source and sediment controls.
The work consists of implementing the storm water pollution prevention measures to prevent sediment from entering
streams or water bodies as specified in this Section in conformance with the requirements of Section
01 57 20.00 10 ENVIRONMENTAL PROTECTION, and the requirements of the National Pollution Discharge Elimination
System (NPDES) permit attached to that Section.
1.3 EROSION AND SEDIMENT CONTROLS
The controls and measures required of the Contractor are described below.
1.3.1 Stabilization Practices
NOTE: Describe interim stabilization practices, including site-specific scheduling
of the implementation of the practices. Plans should ensure that existing vegetation
is preserved where attainable and disturbed areas are stabilized. Show locations
for stabilization practices on the drawings.
The stabilization practices to be implemented include [temporary seeding,] [mulching,] [geotextiles,] [sod stabilization,]
[vegetative buffer strips,] [erosion control matts,] [protection of trees,] [preservation of mature vegetation,]
[etc]. On the daily CQC Report, 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, initiate stabilization practices as soon as practicable,
but no more than 14 days, in any portion of the site where construction activities have [temporarily or] permanently
ceased.
1.3.1.1 Unsuitable Conditions
Where the initiation of stabilization measures by the fourteenth day after construction activity [temporarily
or] permanently ceases or is precluded by unsuitable conditions caused by the weather, initiate stabilization
practices as soon as practicable after conditions become suitable.
1.3.1.2 No Activity for Less Than 21 Days
When the total time period in which construction activity is temporarily ceased on a portion of the site is [21]
[_____] days minimum, stabilization practices do not have to be initiated on that portion of the site until 14
days have elapsed after construction activity temporarily ceased.
1.3.1.3 Burnoff
Burnoff of the ground cover is not permitted.
1.3.1.4 Protection of Erodible Soils
Immediately finish the earthwork brought to a final grade, as indicated or specified, and protect the side slopes
and back slopes upon completion of rough grading. Plan and conduct earthwork to minimize the duration of exposure
of unprotected soils.
1.3.2 Erosion, Sediment and Stormwater Control
NOTE: For projects located in Virginia where 10,000 or more square feet of
land area are disturbed, choose the paragraph below.
a. [Submit "Erosion and Sediment Controls" (E&S) (form provided at the pre-construction conference)
[and Storm Water Inspection Reports for General Permit] to the Contracting Officer once every 7 calendar
days and within 24 hours of a storm event that produces 12 mm 0.5 inch or more of rain.]
NOTE: For projects located in North Carolina where 1 or more acres (0.4 hectares)
of land area are disturbed, choose the paragraph below and delete paragraph,
Storm Water Notice of Intent for Construction Activities.
b. [Submit "Erosion and Sediment Control Reports" (E&S) (form provided at the pre-construction conference)
and "Stormwater Inspections for General Permit NCG010000 - Land Disturbing Activities" (form provided
at http://h2o.enr.state.nc.us/su/PDF_Files/SW_General_Permits/NCG01_Inspect_log.pdf) to the Contracting
Officer once every 7 days and within 24 hours of a storm event that produces 0.5 inch or more of rain.]
c. [Comply with NCG010000, North Carolina Permit to Discharge Storm Water under the National Pollutant
Discharge Elimination System. The existing permit may be obtained from: http://h20.enr.state.nc.us/su/PDF_Files/SW_General_Permits/NCG01_Inspect_log.pdf
.]
d. Storm Water Notice of Intent for Construction Activities
NOTE: Use paragraph "e" when 0.4 or more hectares (1 or more acres) of total
land area are to be disturbed during the construction. This requirement is
the Federal EPA standard. Some States are more stringent; e.g., South Carolina
EPA standards invoke these requirements for construction sites disturbing any
land area within 0.8 kilometer (1/2 mile) of a receiving water body in the Coastal
Zone. Verify if the requirements of this paragraph are applicable for land
area less than the Federal EPA standard by checking with the EPA of the State
where the project is located. Edit the text accordingly.
e. Submit a Storm Water Notice of Intent for NPDES coverage under the general permit for construction
activities and a Storm Water Pollution Prevention Plan (SWPPP) for the project to the Contracting Officer
prior to the commencement of work. The SWPPP shall meet the requirements of the [EPA][State of [_____]]
general permit for storm water discharges from construction sites. Submit the SWPPP along with any required
Notice of Intents, Notice of Termination, and appropriate permit fees, via the Contracting Officer, to
the appropriate [Federal][State] agency for approval, a minimum of 14 calendar days prior to the start
of any land disturbing activities. Maintain an approved copy of the SWPPP at the construction on-site
office, and continually update as regulations require, to reflect current site conditions. Include within
the SWPPP:
(1) Identify potential sources of pollution which may be reasonably expected to affect the
quality of storm water discharge from the site.
(2) Describe and ensure implementation of practices which will be used to reduce the pollutants
in storm water discharge from the site.
(3) Ensure compliance with terms of the [EPA][State of [_____]] general permit for storm water
discharge.
(4) Select applicable best management practices from EPA 832-R-92-005.
(5) Include a completed copy of the Registration Statement, BMP Inspection Report Template
and Notice of Termination except for the effective date.
[(6) Storm Water Pollution Prevention Measures and Notice of Intent 40 CFR 122.26, EPA 832-R-92-005
. Provide a "Storm Water Pollution Prevention Plan" (SWPPP) for the project. The SWPPP will
meet the requirements of the [EPA][State of [_____]] general permit for storm water discharges
from construction sites. Submit the SWPPP along with any required Notice of Intents, Notice
of Termination, and appropriate permit fees, via the Contracting Officer, to the appropriate
[Federal][State] agency for approval, a minimum of 14 calendar days prior to the start of construction.
A copy of the approved SWPPP will be kept at the construction on-site office, and continually
updated as regulations require to reflect current site conditions.]
NOTE: For projects located in Virginia where 1 or more acres (0.4 hectares)
of land area are disturbed during construction, use the following paragraph
instead of the above item in addition to items (a) thorough (e).
[(7) Storm Water Pollution Prevention Measures and Notice of Intent 40 CFR 122.26, EPA 832-R-92-005.
Provide a "Storm Water Pollution Prevention Plan" (SWPPP) for the project. The SWPPP will meet
the requirements of the State of Virginia general permit for storm water discharges from construction
activities. Submit the SWPPP to the Contracting Officer for review, approval and signature
a minimum of 15 days prior to the start of any land disturbing activities. Maintain an approved
copy of the SWPPP at the construction on-site office, and continually update as regulations
require, to reflect current site conditions.]
(8) Following SWPPP approval, submit Registration Statement and appropriate permit fees to
the Virginia Department of Conservation and Recreation (DCR) before any land disturbing activities
begin. Coverage under the permit begins on the day the Registration Statement and fee are:
(1) post marked by mail, (2) registered online at the DCR's website, or (3) hand delivered to
the DCR office. The Contractor is responsible for all associated fees; contact DCR to determine
applicable fees.
(9) Install, inspect, and maintain best management practices (BMPs) as required by the general
permit. Prepare and submit to DCR, BMP Inspection Reports as required by the general permit.
(10) Once construction is complete and the site has been stabilized with a final, sustainable
cover, submit the Notice of Termination to DCR within 30 days after all land disturbing activities
end.
(11) At the time of submittal to DCR, concurrently forward copies of the SWPPP, Registration
Statement, BMP Inspection Reports, and Notice of Termination to the Contracting Officer, and
to Mid-Atlantic Environmental at: Commander, Naval Facilities Engineering Command, MIDLANT,
Code: EV2, 9742 Maryland Avenue, Norfolk, VA 23511-3095.
(12) Information on the permit application, SWPPP requirements, Registration Statement, BMP
Inspection Reports, and Notice of Termination can be found in the Virginia Permit Regulation
9 VAC 25-180. The Registration Statement, Notice of Termination, and permit fee forms can be
found on the DCR website http://www.dcr.state.va.us/sw/vsmp.htm. This website also contains
the permit regulations and information on how to obtain coverage online.
(13) Once construction is complete and the site has been stabilized with a final, sustainable
cover, submit the Notice of Termination to DCR within 30 days after all land disturbing activities
end.
1.3.3 Stormwater Drainage
NOTE: Use this paragraph for Norfolk Naval Shipyard projects.
There will be no discharge of excavation ground water to the sanitary sewer, storm drains, or to the river without
prior specific authorization of the Environmental Programs Division in writing. Discharge of hazardous substances
will not be permitted under any circumstances. Construction site runoff will be prevented from entering any
storm drain or the river directly by the use of straw bales or other method suitable to the Environmental Programs
Division of the Shipyard. Provide erosion protection of the surrounding soils.
1.3.4 Structural Practices
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, provide 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, 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 sideslope and downslope boundaries of the construction area.
For drainage locations serving less than 4 hectares (10 acres), sediment traps,
silt fences, or equivalent sediment controls are required for all sideslope
and downslope boundaries of the construction area unless a sediment basin providing
storage for 252 cubic meters of storage per hectare (3,600 cubic feet of storage
per acre) drained is provided.
Listed are examples of typical structural devices. Requirements for Silt Fences,
Straw Bales, and Diversion Dikes are contained within this Guide Specification.
Add specifications for other structural practices used in the project to this
section.
a. Silt fences.
b. Straw bales.
c. Diversion dikes.
d. Drainage swales.
e. Check dams.
f. Subsurface drains.
g. Pipe Slope drains.
h. Level spreaders.
i. Storm drain inlet protection.
j. Rock outlet protection.
k. Sediment traps.
l. Reinforced soil retaining systems.
m. Gabions.
n. Sediment basins.
The permanent stabilization practices which are to be installed under the contract
should be specified in other section of the specifications. These are measures
that will be installed during the construction process to control pollutants
in storm water discharges that will occur after construction operations have
been completed. Structural measures should be placed on upland soils to the
degree attainable. The installation of these devices may be subject to Section
404 of the Clean Water Act.
A goal of 80 percent removal of total suspended solids from these flows which
exceed predevelopment levels should be used in designing and installing storm
water management controls (where practicable). Where this goal is not met,
the permittee must provide justification for rejecting each practice listed
above based on site conditions.
Place velocity dissipation devices at discharge locations and along the length
of any outfall channel as necessary to provide a non-erosive velocity flow from
the structure to a water course so that the natural physical and biological
characteristics and functions are maintained and protected.
Implement structural practices to divert flows from exposed soils, temporarily store flows, or otherwise limit
runoff and the discharge of pollutants from exposed areas of the site. Implement structural practices in a timely
manner, during the construction process, to minimize erosion and sediment runoff. Include the following devices;
[Location and details of installation and construction are shown on the drawings.]
[1.3.4.1 Silt Fences
Provide silt fences as a temporary structural practice to minimize erosion and sediment runoff. Properly install
silt fences to effectively retain sediment immediately after completing each phase of work where erosion would
occur in the form of sheet and rill erosion (e.g. clearing and grubbing, excavation, embankment, and grading).
Install silt fences in the locations indicated on the drawings. Obtain approval from the Contracting Officer
prior to final removal of silt fence barriers.
][1.3.4.2 Straw Bales
NOTE: EPA may not recommend the use of straw bales in certain rugged locations
because bales do not easily conform to the ground contours. Other materials
like fiber or coier rolls should be investigated.
For item d. below, space rows a maximum of 60 meters (200 feet) apart in drains
with slopes equal to or less than 5 percent and 30 meters (100 feet) apart in
drains with slopes steeper than 5 percent. If drainage ditches have slopes
above and below the 5 percent limit the spacing should be shown on the drawings.
Provide [bales of straw] [_____] as a temporary structural practice to minimize erosion and sediment runoff.
If bales are used, properly place the bales to effectively retain sediment immediately after completing each
phase of work (e.g., clearing and grubbing, excavation, embankment, and grading) in each independent runoff area
(e.g., after clearing and grubbing in a area between a ridge and drain, place the bales as work progresses, remove/replace/relocate
the bales as needed for work to progress in the drainage area). Show on the drawings areas where straw bales
are to be used. The Contracting Officer will approve the final removal of straw bale barriers. Provide rows
of bales of straw as follows:
a. Along the downhill perimeter edge of all areas disturbed.
b. Along the top of the slope or top bank of drainage ditches, channels, swales, etc. that traverse
disturbed areas.
c. Along the toe of all cut slopes and fill slopes of the construction areas.
d. Perpendicular to the flow in the bottom of existing drainage ditches, channels, swales, etc. that
traverse disturbed areas or carry runoff from disturbed areas. Space the rows [a maximum of [_____]
meters feet apart] [as shown on the drawings].
e. Perpendicular to the flow in the bottom of new drainage ditches, channels, and swales. Space the
rows [a maximum of [_____] m feet apart] [as shown on the drawings].
f. At the entrance to culverts that receive runoff from disturbed areas.
g. [_____].
][1.3.4.3 Diversion Dikes
Build diversion dikes with a maximum channel slope of 2 percent and adequately compacted to prevent failure.
The minimum height measured from the top of the dike to the bottom of the channel shall be 0.5 m 18 inches.
The minimum base width shall be 1.8 m 6 feet and the minimum top width shall be 0.6 m 2 feet. Ensure that the
diversion dikes are not damaged by construction operations or traffic. Locate diversion dikes where shown on
the drawings.
]1.3.5 Sediment Basins
NOTE: The appropriate design-year storm is determined by the downstream environment
to be protected. In the event permanent sediment basins are necessary for the
particular project, these permanent facilities will be included in the project
design and included as part of the contract documents. If permanent basins
are not required, delete reference thereto. For natural environments, the following
general guidelines should be followed:
Downstream Environment Design-Year Storm
Dry wash or areas without
significant vegetation 0-1
Seasonal creek or highly
vegetative areas 10
Stream, river, estuary, or
other open waters 25
Lake, reservoir, harbor, bay,
or other closed waters 50
Trap sediment in [temporary] [permanent] sediment basins. Select a basin size to accommodate the runoff of a
local [_____]-year storm. Pump dry and remove the accumulated sediment, after each storm. Use a paved weir
or vertical overflow pipe for overflow. Remove collected sediment from the site. Institute effluent quality
monitoring programs. Install, inspect, and maintain best management practices (BMPs) as required by the general
permit. Prepare BMP Inspection Reports as required by the general permit. If required by the permit, include
those inspection reports.
1.3.6 Vegetation and Mulch
a. Provide temporary protection on sides and back slopes as soon as rough grading is completed or sufficient
soil is exposed to require erosion protection. Protect slopes by accelerated growth of permanent vegetation,
temporary vegetation, mulching, or netting. Stabilize slopes by hydroseeding, anchoring mulch in place,
covering with anchored netting, sodding, or such combination of these and other methods necessary for
effective erosion control.
NOTE: Indicate section number and title in blank below using proper format
per UFC 1-300-02.
b. Seeding: Provide new seeding where ground is disturbed. Include topsoil or nutriment during the
seeding operation necessary to [establish] [reestablish] a suitable stand of grass. [The seeding operation
will be as specified in Section 32 92 19 SEEDING.]
1.4 SUBMITTALS
NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are for [Contractor Quality Control approval.] [information only. When used, a designation following the "G"
designation identifies the office that will review the submittal for the Government.] Submit the following in
accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-01 Preconstruction Submittals
Storm Water Pollution Prevention Plan
Storm Water Notice of Intent
Pollution prevention plan and Notice of intent for NPDES coverage under the general permit
for construction activities
SD-06 Test Reports
Storm Water Inspection Reports for General Permit
Erosion and Sediment Controls
SD-07 Certificates
Mill Certificate or Affidavit
Certificate attesting that the Contractor has met all specified requirements.
1.5 DELIVERY, STORAGE, AND HANDLING
Identify, store and handle filter fabric in accordance with ASTM D 4873.
PART 2 PRODUCTS
2.1 COMPONENTS FOR SILT FENCES
2.1.1 Filter Fabric
Provide geotextile that complies with the requirements of ASTM D 4439, and consists of polymeric filaments which
are formed into a stable network such that filaments retain their relative positions. The filament shall consist
of a long-chain synthetic polymer composed of at least 85 percent by weight of ester, propylene, or amide, and
contains stabilizers and/or inhibitors added to the base plastic to make the filaments resistent to deterioration
due to ultraviolet and heat exposure. Provide synthetic filter fabric that contains ultraviolet ray inhibitors
and stabilizers to assure a minimum of six months of expected usable construction life at a temperature range
of -18 to plus 49 degrees C 0 to 120 degrees F. The filter fabric shall meet the following requirements:
FILTER FABRIC FOR SILT SCREEN FENCE
PHYSICAL PROPERTY TEST PROCEDURE STRENGTH REQUIREMENT
Grab Tensile ASTM D 4632 445 N min.
Elongation (percent) 30 percent max.
Trapezoid Tear ASTM D 4533 245 N min.
Permittivity ASTM D 4491 0.2 sec-1
AOS (U.S. Std Sieve) ASTM D 4751 20-100
FILTER FABRIC FOR SILT SCREEN FENCE
PHYSICAL PROPERTY TEST PROCEDURE STRENGTH REQUIREMENT
Grab Tensile ASTM D 4632 100 lbs. min.
Elongation (percent) 30 percent max.
Trapezoid Tear ASTM D 4533 55 lbs. min.
Permittivity ASTM D 4491 0.2 sec-1
AOS (U.S. Std Sieve) ASTM D 4751 20-100
2.1.2 Silt Fence Stakes and Posts
Use either wooden stakes or steel posts for fence construction. Wooden stakes utilized for silt fence construction,
shall have a minimum cross section of 50 by 50 mm 2 by 2 inches when oak is used and 100 by 100 mm 4 by 4 inches
when pine is used, and have a minimum length of 1.5 m 5 feet. Steel posts (standard "U" or "T" section) utilized
for silt fence construction, shall have a minimum mass of 1.98 kg/linear meter weight of 1.33 pounds/linear foot
and a minimum length of 1.5 m 5 feet.
2.1.3 Mill Certificate or Affidavit
Provide a mill certificate or affidavit attesting that the fabric and factory seams meet chemical, physical,
and manufacturing requirements specified above. Specify in the mill certificate or affidavit the actual Minimum
Average Roll Values and identify the fabric supplied by roll identification numbers. Submit a mill certificate
or affidavit signed by a legally authorized official from the company manufacturing the filter fabric.
2.2 COMPONENTS FOR STRAW BALES
The straw in the bales shall be stalks from oats, wheat, rye, barley, rice, or from grasses such as byhalia,
bermuda, etc., furnished in air dry condition. Provide bales with a standard cross section of 350 by 450 mm
14 by 18 inches. Wire-bound or string-tie all bales. Use either wooden stakes or steel posts to secure the
straw bales to the ground. Wooden stakes utilized for this purpose, shall have a minimum dimensions of 50 by
50 mm 2 by 2 inches in cross section and have a minimum length of 1 m 3 feet. Steel posts (standard "U" or "T"
section) utilized for securing straw bales, shall have a minimum mass of 1.98 kg/linear meter weight of 1.33
pounds/linear foot and a minimum length of 1 m 3 feet.
PART 3 EXECUTION
NOTE: Additional execution topics such as the requirements for a contractor
to take rain gage measurements; detail record keeping on the contractors inspection
of its BMPs and repairs; the ability to allow the DPW to get the COE to assess
fines using liquidated damages, etc. may be added when necessary.
3.1 INSTALLATION OF SILT FENCES
Extend silt fences a minimum of 400 mm 16 inches above the ground surface without exceeding 860 mm 34 inches
above the ground surface. Provide filter fabric from a continuous roll cut to the length of the barrier to avoid
the use of joints. When joints are unavoidable, splice together filter fabric at a support post, with a minimum
150 mm 6 inch overlap, and securely sealed. Excavate trench approximately 100 mm 4 inches wide and 100 mm 4
inches deep on the upslope side of the location of the silt fence. The 100 by 100 mm 4 by 4 inch trench shall
be backfilled and the soil compacted over the filter fabric. Remove silt fences upon approval by the Contracting
Officer.
3.2 INSTALLATION OF STRAW BALES
Place the straw bales in a single row, lengthwise on the contour, with ends of adjacent bales tightly abutting
one another. Install straw bales so that bindings are oriented around the sides rather than along the tops and
bottoms of the bales in order to prevent deterioration of the bindings. Entrench and backfill the barrier.
Excavate a trench the width of a bale and the length of the proposed barrier to a minimum depth of 100 mm 4 inches
. After the bales are staked and chinked (gaps filled by wedging with straw), backfill the excavated soil against
the barrier. Conform the backfill soil with the ground level on the downhill side and build up to 100 mm 4 inches
against the uphill side of the barrier. Scatter loose straw over the area immediately uphill from a straw bale
barrier to increase barrier efficiency. Securely anchor each bale by at least two stakes driven through the
bale. Drive the first stake or steel post in each bale toward the previously laid bale to force the bales together.
Drive stakes or steel pickets a minimum 450 mm 18 inches deep into the ground to securely anchor the bales.
3.3 FIELD QUALITY CONTROL
NOTE: Describe the procedures to be followed during construction to maintain
the vegetation, erosion and sediment control measures, and other protective
measures in good and effective operating condition.
Maintain the temporary and permanent vegetation, erosion and sediment control measures, and other protective
measures in good and effective operating condition by performing routine inspections to determine condition and
effectiveness, by restoration of destroyed vegetative cover, and by repair of erosion and sediment control measures
and other protective measures. Use the following procedures to maintain the protective measures.
3.3.1 Silt Fence Maintenance
Inspect the silt fences in accordance with paragraph, titled "Inspections," of this section. Any required repairs
shall be made promptly. Pay close attention to the repair of damaged silt fence resulting from end runs and
undercutting. Should the fabric on a silt fence decompose or become ineffective, and the barrier is still necessary,
replace the fabric promptly. Remove sediment deposits when deposits reach one-third of the height of the barrier.
Remove a silt fence when it is no longer required. The immediate area occupied by the fence and any sediment
deposits shall be shaped to an acceptable grade. The areas disturbed by this shaping shall [receive erosion
control] [be seeded in accordance with Section 32 05 33 LANDSCAPE ESTABLISHMENT, except that the coverage requirements
in paragraph, titled "Establishment" of this section do not apply].
3.3.2 Straw Bale Maintenance
Inspect straw bale barriers in accordance with paragraph, titled "Inspections". Pay close attention to the repair
of damaged bales, end runs and undercutting beneath bales. Accomplish necessary repairs to barriers or replacement
of bales in a promptly manner. Remove sediment deposits when deposits reach one-half of the height of the barrier.
At the each end of each row turn bales uphill when used to retain sediment. Remove a straw bale barrier when
it is no longer required. The immediate area occupied by the bales and any sediment deposits shall be shaped
to an acceptable grade. Seed the areas disturbed by this shaping in accordance with Section 32 92 19 SEEDING.
3.3.3 Diversion Dike Maintenance
Inspect diversion dikes in accordance with paragraph, titled "Inspections," of this section. Pay close attention
to the repair of damaged diversion dikes and accomplish necessary repairs promptly. When diversion dikes are
no longer required, shape to an acceptable grade. Seed the areas disturbed by this shaping in accordance with
Section 32 92 19 SEEDING.
3.4 INSPECTIONS
NOTE: Currently some of the installations are assigned small MS4 permits which
require them to develop, implement and enforce construction site inspections
allowing enforcement on the Contractor for CWA violations.
In some cases it may be desirable to require the Contractor to inspect the BMPs
before, during, and after a storm event. By inspecting during a storm event,
the Contractor can determine if the BMPs are actually working or whether they
are being breached.
3.4.1 General
Inspect disturbed areas of the construction site, areas that have not been finally stabilized used for storage
of materials exposed to precipitation, stabilization practices, structural practices, other controls, and area
where vehicles exit the site at least once every seven (7) calendar days and within 24 hours of the end of any
storm that produces 13 mm 0.5 inches or more rainfall at the site. Conduct inspections at least once every month
where sites have been finally stabilized.
3.4.2 Inspections Details
Inspect disturbed areas [and areas used for material storage that are exposed to precipitation] for evidence
of, or the potential for, pollutants entering the drainage system. Observe erosion and sediment control measures
identified in the Storm Water Pollution Prevention Plan to ensure that they are operating correctly. Inspect
discharge locations or points to ascertain whether erosion control measures are effective in preventing significant
impacts to receiving waters. Inspect locations where vehicles exit the site for evidence of offsite sediment
tracking.
3.4.3 Inspection Reports
For each inspection conducted, prepare a report summarizing the scope of the inspection, name(s) and qualifications
of personnel making the inspection, the date(s) of the inspection, major observations relating to the implementation
of the Storm Water Pollution Prevention Plan, maintenance performed, and actions taken. Furnish the report to
the Contracting Officer within 24 hours of the inspection as a part of the Contractor's daily CQC REPORT. A
copy of the inspection report shall be maintained on the job site.
3.4.4 [Monthly Inspection Report and Certification Form
NOTE: Some States require submittal of inspection reports to their respective
agency. If this is required in the state where the proposed project is located,
the following example should be appropriately edited and included in the project
specifications. The designer should attach the appropriate state forms at the
end of this section.
Complete, sign, and submit the original form, on the first working day of each month, to the State of [_____],
[Office of Pollution Control (OPC)] at the following address:
Chief, [_____]
[_____]
[_____]
[_____]
A copy of the State of [_____]'s [Monthly Inspection Report and Certification Form for Erosion and Sediment Controls]
is attached to the end of this section. Also furnish, on the first working day of each month, one copy of the
form submitted to the [OPC] to the Contracting Officer as part of the Contractor's daily CQC Report and attach
a copy of the completed form to the Plan. Unless otherwise notified by the [OPC], submit the [Monthly Inspection
Report and Certification Forms] for an additional two months after the final completion of all storm water pollution
prevention measures required in this contract have been implemented.]