SS 832 Temporary
Sediment and Erosion Controls
Be advised SS832 dated 5/5/2009
is included in its entirety at the end of this document for reference only; the
official version is available online.
Description (832.01)
All references to 207 have
been removed from the C&MS
2013. This Sediment and
Erosion Control contract item will remain as a supplemental specification to
allow for the timely contract revision of the NPDES
construction general permit, commonly referred to as the storm water permit.
Projects which involve 1 acre or more of earth disturbing activity are required
to have an NPDES Permit. This permit pertains to both the work within
the project work limits and related support activities. Supplemental
Specification 832 is required to be installed in all
contract documents regardless of the amount of Earth Disturbed Area (EDA).
1. The Contractor is required to furnish a fully executed
Co-Permittee form.
2. The Contractor is required to furnish a site specific
Storm Water Pollution Prevention Plan (SWPPP) that is
compliant with the NPDES Permit (see 832 Appendix E).
3. The Contractor is required to locate, furnish, and
maintain all BMP as identified in the Contractor’s SWPPP.
4. Project personnel are required to read the permit, 832 Appendix E, and should inform the Contractor of any
non-compliant permit conditions known on the construction site.
5. If stream or river crossing (causeway) provisions are
not specifically included in the contract documents, the Contractor must obtain
the proper permit to construct a stream or river crossing. Fording
streams, rivers, or waterways is not permitted.
Definitions (832.02)
Co-Permittee: The
Contractor is required to file the Co-Permittee form
to OEPA. This
form notifies OEPA that the Contractor is an
“Operator.” Both ODOT and the Contractor are identified as “Operators” in the NPDES Permit. As a
result, both ODOT and the Contractor are required to keep the construction
activity in compliance with the NPDES Permit. ODOT contractually holds the Contractor
responsible for compliance and provides compensation for the Contractor’s
efforts. ODOT cannot knowingly allow a
permit violation to exist without taking corrective measures. If a permit violation or deficiency is
identified, the Contractor should be notified and reminded of his contractual
responsibility to maintain permit compliance.
Standard Construction Drawing Reference (832.03)
The Standard Construction
Drawings (SCD) provide detailed information which
describe the materials, construction, and installation requirements for most of
the BMP. The SCDs
are referenced in SS 832; however, they are often
overlooked by the Contractor’s crews who perform the work. The SCDs should be
brought to the Contractor’s attention as early in the project as possible, and
preferably at, or even before, the preconstruction meeting. Project staff should use the SCDs when inspecting and measuring BMP for payment.
Requirements (832.04)
Post construction NPDES Storm Water Management Requirements are not included
in this specification. Post construction
controls are not considered temporary, and therefore, are addressed in the
project plans. Project staff should be
familiar with the Post Construction BMPs, where they
are located in the plans and on-site. OEPA may
specifically inspect these BMP during a field visit.
Provisions (832.05)
The “Provisions” portion of
the specification identifies how the ODOT contract handles storm-water
enforcement actions resulting from non-compliance. The NPDES Permit
holds the Operator responsible for compliance.
Both ODOT and the Contractor are identified as Operators. If a non-compliant condition results in OEPA enforcement action, the Contractor agrees to:
1. Make all necessary corrections resulting from an
incomplete or inadequate SWPPP.
2. Reimburse ODOT for any fine penalty assessment damage
judgment or expense resulting from non-compliance regulatory action.
3. Indemnify and hold the Department harmless for any fine
penalty assessment damage judgment or expense resulting from non-compliance
regulatory action.
4. If a stop work order is issued resulting from an
incomplete or inadequate SWPPP and/or BMPs, the Department will find the Contractor in default.
5. Failure to correct non-compliant site conditions may
result in suspension of the work and/or removal of the project superintendent.
When notifying the Contractor
of non-compliance matters, the provisions portion of the spec should be
referenced.
EDA Requirements (832.06)
ODOT Maintenance projects
involving less than 5 acres of maintenance work activity are exempt from the NPDES Permitting requirements. For a project to be eligible for this
exemption, it is required that all work activity included in the project fall
under the OEPA approved list of “Maintenance
Activities.” The approved list can be found at:
http://www.epa.ohio.gov/dsw/storm/routine_maint.aspx
If the Contractor elects to
work outside of the project limits (typically areas for borrow, waste, staging,
or storage) and the EDA is greater than 1 acre, the
Contractor is required to either include the areas outside the project limits
on the SWPPP or obtain a separate, Contractor-held NPDES Construction General permit.
Work Outside the
Project Work Limits
If the project has identified
any EDA within the project limits, even less than a 1
acre Project EDA, ODOT will compensate the Contractor
for the installation of appropriate BMP within the project limits. For projects with more than 1 acre of EDA, the Contractor is required to specifically identify
all work areas located outside of the project work limits on his SWPPP. The cost for
expanding the SWPPP coverage outside of the project
work limits is included in the lump sum price bid for SWPPP. See 107.19
for general environmental protection requirements. It is important to note that the Contractor EDA may be on ODOT R/W but outside of the project work
limits.
Jurisdictional Waters may
include Waters of the State or Waters of the U.S. In either case, a permit may be required (107.19).
Placement of fill in these regulated waters (streams, ponds, lakes, waterways,
etc.) without a permit is illegal. The
Contractor is required to furnish the proper permit for any area affected by
his operation that is outside of the project work limits. This may include temporary work pads, stream
crossings, causeways, or placement of any fill in Jurisdictional Waters that are
not otherwise identified in the plans.
The Contractor is required to
furnish spill response equipment for all operations working next to a body of
water. See 107.19
and Special Provisions.
The Contractor is required to
furnish water handling controls that are capable of preventing sediment-laden
water from being discharged from the site.
This is an important consideration when working in and around water
areas on drilled shafts, cofferdams, dewatering operations, etc. (107.19).
The Contractor is required to
provide a location to properly wash out cement or concrete trucks. Concrete washdown water is toxic and can cause a fish kill or other
serious environmental impact. Concrete
truck washdown BMP must be located away from all
bodies of water. The Contractor is
required to locate the concrete washout BMP(s) on the SWPPP.
BMP Materials (832.07)
The Standard Construction
Drawings referenced on the plan title sheet contain details that are often
overlooked by the Contractor. The SCDs have been revised to address the latest version of the
storm water permit. Earlier SCD versions
may reference sediment and erosion controls that are no longer recognized by OEPA as viable BMPs.
Furnish the materials as
outlined below:
1. Furnish commercial fertilizer, seed, and mulch
material that meet 659.
2. Furnish filter fabric material for ditch checks that
meets standard drawing DM-4.4. It is important to note that this BMP
includes the installation of an aggregate component to prevent high flows and
sediment accumulation from collapsing the fabric fence.
3. Furnish rock material for ditch checks that meets
standard drawing DM-4.4.
4. Furnish filter fabric material for inlet protection
that meets standard drawing DM-4.4.
5. Furnish filter fabric material for perimeter controls
that meets standard drawing DM-4.4.
6. Furnish filter fabric material or hay or straw bale
material for bale filter dikes that meets standard drawing DM-4.3.
7. Furnish excavation and embankment material for
sediment basins and dams that meets the capacity and 48-hour draw down requirements
described in the NPDES permit.
8. Furnish pipe material for slope drains that meets
standard drawing DM-4.3.
9. Furnish rock channel protection material that meets
standard drawing DM-4.3.
Furnish and Locate BMP (832.08)
The NPDES
permit requires that the SWPPP identify the type,
location, and size of all sediment and erosion controls installed or proposed
on the project site. The Contractor is
required to keep the SWPPP current with the controls
installed and maintained on site 832 Appendix E Part
III.C.2.D.
Figure
832.A2 – Perimeter Filter Fabric Fence
Perimeter Controls (832.05.A)
Apply perimeter control
practices to protect the disturbed area from off-site runoff and to prevent
sediment from discharging off-site to areas below the construction site.
Sediment and runoff barriers surrounding the area disturbed by construction
activity prevents runoff from moving off-site and impacting surface waters
downstream.
1. Perimeter controls must be placed and identified in
the SWPPP before or concurrent with any clearing and
grubbing operation.
2. The perimeter controls should be dated on the SWPPP along with the dates of the clearing and grubbing.
3. Perimeter controls BMP are detailed in standard
drawing DM-4.4.
4. Perimeter controls (typically dikes) can effectively
divert water away from the project, and when designed properly, can separate
watersheds into smaller drainage areas reducing the need for large sediment
settling ponds.
5. Perimeter controls should be used to protect all water
bodies (ponds, streams, wetlands, etc.) and any areas shown on the plan which
may be adversely affected by construction surface drainage.
Figure
832.A3 – Perimeter Control, Water Body Protection
Filter Fabric Fence
Filter Fabric Fence is used
to control sheet flow, not concentrated flow.
The application of Filter Fabric Fence is limited by the steepness of
the slope and the size of the surface area draining toward the fence. The regulatory limitations for Filter Fabric
Fence are outlined in the NPDES Permit. See 832 Appendix E, Part
III.G.2.d.
It is critical that Filter
Fabric Fence be installed in accordance with standard construction drawing DM 4.4. The
fabric must be installed in a 6-inch by 6-inch trench and backfilled with
compacted earth. Placement of the fence
along the ground surface and shoveling fill on top of the lower edge of the fabric
is not acceptable.
Filter Fabric Fence is a
filter. It should be installed down
gradient of EDA to filter sediment from sheet
flow. Do not install silt fence above EDA areas.
When Filter Fabric Fence
fails in the field, it is typically caused by one or more of the following:
1. Improper burial depth.
2. Drainage area exceeds the capacity of the fence.
3. Fence is not parallel to the surface contours.
4. Poor maintenance.
Dikes
Dikes can be used as a
perimeter control. Dikes function best
by collecting and concentrating sheet flow then directing it to an appropriate
controlled outlet or other BMP which does not allow the discharge of sediment.
Inlet Protection (832.05.B)
Place Inlet Protection as
outlined below. The location and date of
placement, maintenance, or removal should be identified on the SWPPP. It is
recommended that all Inlet Protection be numbered and dated both in the field
and on the SWPPP.
Figure
832.B – Inlet Protection
1. If Inlet Protection is being used as a BMP, it is
required that they be located on the SWPPP.
2. Inlet Protection should be dated on the SWPPP.
3. Inlet Protection should be used around Catch Basin
inlets and/or any structure that conveys storm water.
4. Inlet Protection requirements are detailed on standard
drawing DM-4.4.
5. When Inlet Protection fails in the field, it is
typically caused by one or more of the following:
a. Improper burial depth.
b. Inadequate height of fence above inlet invert.
c. Improper lap of fabric.
d. Poor maintenance.
Construction Seeding
and Mulching (832.05.C)
Seed and mulch all disturbed
areas that have been idled, particularly before winter shut down.
Figure
832.C – Construction Seeding and Mulching
Figure
832.C2 – Winter Seed and Mulch, with mulch crimped in place
1. The rate furnished for straw mulch is 3 tons per acre
(0.5 metric ton/1000 m²).
2. The rate furnished for fertilizer is half the rate
found in Item 659.
3. Do not place Construction Seed on frozen ground.
4. Install Construction Seed and Mulch on disturbed areas
that work will be suspended during the winter.
Standard Construction Seed and Mulch should not be installed between
October 15 and March 15.
5. Winter Seed and Mulch is the standard erosion control
practice for EDA occurring between October 15 and
March 15. This BMP includes mulch
crimped in place or a Bonded Fiber Matrix capable of providing sufficient
protective cover to comply with the NPDES
permit. The cost for installing BFM mulch is typically greater than crimped mulch. The BFM mulch is
better suited for limited area applications on steep slopes or areas where
crimping implement access is limited.
The use of other seed and/or mulch materials in this time period
requires Department approval.
6. Temporary cover such as Construction Seed and Mulch,
Construction Mulch or Winter Seed and Mulch should be installed as the
construction progresses and not when a big enough area is exposed to the
elements. Temporary cover requirements
address the allowable time that disturbed earth may remain exposed. It is important that temporary cover installation
keeps up with construction progress.
7. The date of construction seed placement should be
recorded on the SWPPP and corresponding NPDES inspection reports.
Slope Protection (832.05.F)
Fill slopes that are greater than
8 feet (2.5M) and have had no filling activity for 3 weeks.
Figure
832.E – EC Items Required For Slope Protection
1. If dikes are being used as a BMP, it is required that
they be located on the SWPPP.
2. Dikes should be dated on the SWPPP
along with the date of the slope construction.
3. Dike and slope drain construction requirements are
outlined on standard drawing DM-4.3.
Figure
832.E2 – Item 670 Recommended for Cut Slope construction
When constructing cut slopes,
a surface water control ditch should be installed before the slope excavation
begins.
1. The ditch should be constructed at the top of the cut
slope.
2. If the ditch is being used as a BMP, it is required
that it be located on the SWPPP.
3. It is important that the ditch is constructed with
sufficient grade to prevent water from saturating the underlying soils and
causing slope instability problems.
Ditch Checks and
Ditch Protection (832.05.G)
Figure
832.F1 – Filter Fabric Ditch Check
1. Construct Filter Fabric Ditch Checks as soon as ditch
is cut.
2. Ditch Checks shall be placed per the SWPPP or as required.
3. Ditch Checks are BMP and are required to be recorded
on the SWPPP along with the ditch construction.
4. Filter Fabric Ditch Checks construction requirements
are detailed on the standard drawing DM-4.4.
5. Filter Fabric Ditch Checks are limited to drainage
areas of 2 acres (0.8 ha) or less.
6. Filter Fabric Ditch Checks include No. 1 thru No. 4
aggregate components. The Engineer may waive
the aggregate requirement when ditch checks are needed in the clear zone. The aggregate should be replaced with straw
bales staked in place against the filter fabric as detailed on standard
construction drawing DM-4.4
(see Figure 832 F2).
7. It is important that Ditch Checks be in place by the
end of the day if working on the ditch.
Figure
832.F2 – Filter Fabric Ditch Check with Straw Bale Backing
Figure
832.F3 – Rock Ditch Check
1. Rock Ditch Checks shall be placed per the SWPPP or as required.
2. If Rock Ditch Checks are used as BMP, they should be
recorded on the SWPPP.
3. Rock Ditch Checks should be installed as soon as the
ditch is cut.
4. Rock Ditch Checks construction requirements are
detailed on the standard drawing DM-4.4.
5. Rock Ditch Checks are limited to drainage areas
between 2 and 5 acres (0.8 and 2.0 ha).
6. It is important that Ditch Checks be replaced by the
end of the day if working on the ditch.
Bale Filter Dike (832.05.G)
OEPA no
longer recognizes Bale Filter Dikes or Bale Ditch Checks as acceptable BMPs.
Filter
Fabric Ditch Checks that are installed in the clear zone may use straw bales in
lieu of the aggregate backing (see DM 4.4).
Installation of straw bales is permitted only when allowed by the
Engineer.
Sediment Basins and
Dams (832.05.H)
Place
Sediment Basins and Dams as outlined below and as required by the NPDES Permit.
Figure
832.H – Sediment Settling Pond
1. Sediment basins and dams are required to be placed
within 7 days after completion of grubbing and constructed before grading
begins.
2. Sediment basins and dams should be installed as per
the SWPPP and as required by the NPDES
Permit.
3. Sediment basins are a BMP and are required to be
recorded on the SWPPP and routinely inspected.
4. Concentrated flow discharging from areas containing EDA is required to pass through a Sediment Settling Pond.
5. Typical field locations include the bottom of a
ravine, culvert inlets and outlets, at the end of a ditch, and any concentrated
water exit point.
6. Sediment Settling Ponds, Basins or Dams should never be
constructed in a body of water.
7. Sediment Basins and Dams should be sized to retain 67
cubic yards (125 cubic meters) of water for every acre of drainage area. The latest version of the OEPA
NPDES General Construction Permit requires that the
basin volume described above be designed to have a minimum 48 hour draw down
time. Sediment storage ponds are
required to include an additional volume specifically designed for sediment
storage. The sediment storage portion of
the pond consists of 34 cubic yards per acre of disturbed earth in the
watershed. The SWPPP
designer is required to attach the computations for sediment settling pond
design to the Acceptance submittal (832.10).
8. Construction requirements for Sediment Basins and Dams
are detailed on the standard drawing DM-4.3.
9. Install construction fence as needed for safety
considerations.
River, Stream, and Water
Body Protection (832.05.I)
All rivers, streams, and
water bodies must be protected from all sediment-laden or turbid water.
Figure
832.I – Stream Protection
Stream Relocation (832.05.J)
Fully stabilize any
temporary-relocated waterway before the water is diverted, as outlined
below. Examples are temporary
run-arounds to constructed culverts, temporary ditches, or any temporary
waterway constructed by the Contractor to build the project. General and/or specific permits may be
attached to part of the special provisions shown in the plan. Some individual or specific permits may
include requirements in addition to what is required under the general NPDES Permit.
Figure
832.J – Temporary Channel
Temporary Channel
1. Temporary channels require stabilization with rock
channel protection (Item 670
Erosion Protection) or a stand of grass at least 70 percent established.
2. Temporary channels are required to be stabilized
before any flow is diverted into the channel.
3. If the Temporary channel is a 404/401 permit
requirement, costs associated with constructing, maintaining, and removing the
temporary channel are incidental to the work taking place within the footprint
of the 404/401 permit area.
Causeways and Access
Fills (Stream and River Crossings and Fills) (832.06)
Equipment can cross a
waterway only by means of a permitted crossing or causeway. Regulatory permits are required prior to any
disturbance to the waterway. Place
Stream or River Crossings (Causeways) as outlined below and date the placement
on the SWPPP.
Figure
832.K – Stream Crossing
1. Ensure the causeway is a height of 1 foot (.3m) above
the Ordinary High Water Mark (not necessarily the “normal water elevation”).
2. The causeway should be as narrow as practical to
provide for passage of the equipment while preventing the movement of any fill
into the water.
3. Furnish culvert pipes if filling more than one-third
of the waterway. Pipes may be
specifically required per the terms of the 404/401 permit.
4. Only clean, dump rock (non-erodible fill) is permitted
for use in the waterway. Broken concrete
can be used as a temporary fill if all exposed rebar has been removed.
5.
Furnish 50
feet (15m) approach drive of dump rock (non-erodible fill) on both sides of the
causeway.
6.
When a high
water event impairs the Contractor’s ability to work and causes a delay, the Department
will allow an excusable, non-compensable delay.
The Department will compensate the Contractor for required repairs to
the causeway and access fills that were damaged as a result of the high water
event.
Causeways and Access
Fills Construction and Payment (832.07)
Typically, Causeways and
Access Fill environmental protection costs are incidental to the work contained
within the 404/401 permit boundary. In
some cases, Causeways and Access Fills are paid as a separate item. It is important to note that all
environmental controls within the 404/401 permit boundary are incidental to the
work conducted within that boundary. The
Sediment and Erosion Control Prices (SS 832 Appendix F) should not be used as
compensation when BMP are installed within the 404/401 permit boundary.
Figure
832.L – Required Maintenance
Maintenance (832.08)
1. The Contractor is required to maintain all BMP
throughout its functional life on the project.
2. All BMP are required to be sized and designed to
withstand a minimum 1/2-inch rainfall event.
3. The cost for maintaining BMP is included in the price
paid per unit of BMP. Compensation is
provided for BMP replacement and/or repair required as a result of a rainfall
event greater than 1/2 inch. The
Contractor is required to inspect, record, and report all impacts to the BMP
that require maintenance and/or replacement.
BMP must be inspected weekly and within 24 hours of a 1/2-inch or
greater rainfall event.
4. Sediment that accumulates at the BMP requires removal
and proper disposal as part of the Contractor’s responsibility for
maintenance. Safeguards must be in place
to prevent the release of sediment into waters of the state during the BMP
maintenance effort. Disposal of
accumulated sediment must be compliant with C&MS 107.19.
5. Routine maintenance and repair of BMP is required to
be conducted within 3 days of the inspection which identified the need. Sediment settling ponds must be repaired
and/or maintained within 10 days of the inspection. If deficiencies or violations have been
identified on-site, the Contractor is required to correct and mitigate the
conditions within 48 hours of notification by the Department or regulatory
agency 832.05.G.
6. BMP should not be removed until the Earth Disturbing
Activity has been completed and, “A uniform perennial vegetative cover with a
density of at least 70 percent has been established,” on all unpaved
areas. If a silt fence is removed to
accommodate the final grading and seeding operation, it should be replaced
after the seeding work is completed or other perimeter control BMP should be
installed to provide appropriate protection.
OEPA recommends the installation of sediment
basins down gradient as an appropriate control measure when perimeter controls
are removed for final grading and seeding.
BMP Maintenance
Requirements
Routine maintenance on BMP is
required when repairs are needed and when:
1. Rock Ditch Checks have sediment covering half the
height of the rock.
2. Perimeter Filter Fabric Fence, Filter Fabric Ditch
Checks, and/or Inlet Protection have sediment covering half the height of the
fabric.
3. Sediment Settling Ponds require sediment remove
maintenance when the required sediment settling zone is full.
4. Bale Filter Dikes have sediment covering half the
height of the bale.
5. Erosion Control Mats require replacement when they are
torn and/or displaced.
6. Construction Seeding and Mulching has been displaced
and re-application is needed.
Permanent stabilization must
be achieved before the project is accepted.
Once the project is permanently stabilized, (see 832
Appendix E, Part VII.H) all temporary BMP must be
removed and resulting debris disposed of appropriately.
Storm
Water Pollution Prevention Plan (832.09)
1. The Department requires that the SWPPP
be designed by an Engineer (P.E.) that is also a Certified Professional in
Erosion and Sediment Control (CPESC) Registration of
certified professionals can be found at the following websites:
https://license.ohio.gov/lookup/default.asp
http://www.cpesc.org/cc-info/us-directory.asp
2. The SWPPP must show the
location of the BMP for all areas with EDA related to
the project. This includes borrow,
waste, staging, and storage areas that experience EDA.
3. It is important that the SWPPP
identify the watersheds and the area disturbed by the construction in each
watershed (832.12 Appendix E). This provides the project and Contractor with
the location of all drainage outlets from the project. This information is helpful in conducting
appropriate inspections (see 832.14 below).
4. If the Contractor is proposing BMP other than those
identified on the standard BMP pricing schedule, the SWPPP
needs to describe the proposed BMP for the Engineer’s approval, particularly if
compensation is a consideration.
SWPPP Acceptance (832.10)
The intent of acceptance is
to determine if the SWPPP developed by the Contractor
is a reasonable reflection of the site conditions and identifies reasonable
controls that will uphold compliance with the NPDES
Permit. Acceptance is not regulatory
approval. If the SWPPP
is accepted, the Department is recognizing that the Contractor has developed
what appears to be an appropriate plan to comply with NPDES. Sections A through G
of Part III in the NPDES Permit is a checklist that
identifies the minimum SWPPP elements that the
Contractor must have on his plan. If the
SWPPP is not accepted by the project, and the
Contractor requests assistance from the project to develop an acceptable SWPPP, guidelines are available in the form of a checklist
from OEPA. The
checklist is titled, “SWPPP Checklist for
Construction Activities,” and can be found at:
http://www.epa.ohio.gov/dsw/storm/const_SWP3_check.aspx
Project staff can, and should, make
recommendations to the Contractor to facilitate permit compliance. It is important to note that the Contractor’s
responsibility and liability related to NPDES
compliance is reduced when he is directed to perform compliance work by the
Department. The Contractor is required
to tailor his operation in order to comply with the NPDES
Permit. The purpose of this submittal is
to demonstrate compliance with the contract documents. If the Contractor intends on using the
submittal as a mechanism to alter the contract requirements, he is required to
“prominently call attention to the proposed deviation from the contract in the
submittal.”
Inspections and
Updates (832.11)
Inspections are a requirement
of the SWPPP.
The NPDES Permit requires that all controls (BMPs) and all surface water outfalls on the site are
inspected at least once every 7 calendar days and within 24 hours of any storm
event greater than 1/2 inch as per 832 Appendix E
part III.G.2.i. The Storm Water
Inspection Report is a document of record that carries legal liability. The Contractor has the contractual
responsibility to conduct the inspections by or directly under the supervision
of the SWPPP designer who sealed the SWPPP. At least once
a month, the SWPPP designer is required to sign off
on the inspection report with the following standard certification language:
"I certify under penalty of law that this
document and all attachments were prepared under my direction or supervision in
accordance with a system designed to assure that qualified personnel properly
gathered and evaluated the information submitted. Based on my inquiry of the
person or persons who manage the system or those persons directly responsible
for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate and complete. I am aware that there are
significant penalties for submitting false information, including the
possibility of fine and imprisonment for knowing violations."
832 Appendix E part
III.G.2.i describes the minimum components of an inspection report.
It is important that the
inspection specifically includes all discharge locations. If erosion is occurring or sediment is
accumulating at a discharge location along the boundary of the project,
immediate action needs to be taken to document and correct the problem. For situations where off-site sediment is
mixing with surface water from the project, care should be taken to separate
the flows and divert the off-site water away from the site (when
possible). In many instances, the
separation and diversion of off-site surface water is not possible. In these cases, the Contractor should monitor
the in-coming surface water and document the conditions as part of the routine
inspection effort. In the event that OEPA or others identify an NPDES
Permit violation, the remedy and/or corrective action can be identified and
implemented quickly and additional enforcement actions can often time be
avoided.
OEPA refers to the SWPPP as a
“living, breathing document.” The intent
of the SWPPP requirement of the permit is to plan the
work in advance and incorporate the BMP in such a way that prevents the discharge
of pollutants to waters of the state.
The permit requires that the SWPPP be kept
current with the site conditions and document the addition, removal, and
maintenance of the BMP on the SWPPP (see 832 Appendix E, part III.D). The Department requires that the Contractor
perform the required inspections. The
Inspector must be CPESC trained. When modifications to the SWPPP
are needed, the Inspector is required to get approval from the SWPPP Design Engineer.
The SWPPP Design Engineer’s approval is
documented as part of the routine inspection report, which is provided to the
project at least once a month. The Contractor’s Erosion Control Inspector is
required to provide the project with a weekly certification that the site is
compliant with the permit. If the
project does not receive the weekly certifications, SS 832.05 should be
enforced, and the Contractor should be notified in writing. The certification requirement provides the
project with the ability to track compliance issues and to stay current with
the required documentation.
Documentation
Requirements – SS 832 Temporary
Sediment and Erosion Controls
Documentation requirements
include the entries in the Inspector’s Daily Reports, which reflect the
Inspector’s observations relative to the sediment and erosion control
compliance of the site. A BMP Inventory
form is furnished in 832 Appendix A to assist in documenting
and recording the BMP quantities for payment.
The BMP inventory form in
Appendix A is not a substitute for the inspection report described above.
The Contractor is required to
provide the Engineer with an inspection report every 7 days and within 24 hours
of a 1/2-inch (13 mm) or greater rainfall event throughout the life of the
Contract. Inspection requirements can be
reduced to once a month if the SWPPP Engineer
certifies that the entire project has been temporarily stabilized and the
construction activity will be suspended over the winter.
Include the following in the
inspection report:
§ The OEPA NPDES
Permit inspection checklist information (see 832
Appendix E, Part III.G.2.i).
§ A map identifying all BMP needed, installed,
maintained, or removed since the last inspection report.
§ Certification that all construction activities are
compliant with the SWPPP and the signature of the CECI responsible for the inspection.
§ The signature of the Professional Engineer who sealed
the SWPPP is required as part of the inspection
report on a monthly basis or when modifications to the SWPPP
design are made.
§ Include the certification requirements according to OEPA NPDES Permit Part V.H with all reporting sign offs.
Supplemental
Specification 832
Temporary Sediment and Erosion Control
May 5, 2009
832.01 Description
832.02 Definitions
832.03 SCD References
832.04 Requirements and Provisions
832.05 Locate and Furnish BMP
832.06 Causeways and Access Fills (Stream and
River Crossings and Fills)
832.07 Causeway and Access Fills Construction
and Payment
832.08 Maintenance
832.09 Storm Water Pollution Prevention Plan
832.10 SWPPP Acceptance
832.11 Inspections and SWPPP Updates
832.12 Compensation
832.13 Method of Measurement
832.14 Basis of Payment
832.01 Description. This work consists of locating, furnishing, installing, and maintaining temporary sediment and erosion control best management practices for earth disturbing activity areas, developing a Storm Water Pollution Prevention Plan, and filing a Co-Permittee form as required. Furnish a Storm Water Pollution Prevention Plan if required prior to any earth disturbing activity. Furnish and install temporary sediment and erosion control best management practices prior to any earth disturbing activity. Amend the Storm Water Pollution Prevention Plan in accordance with the OEPA NPDES Permit. In the event of conflict between these requirements and pollution control laws, rules, or regulations of other Federal, State, or local agencies, adhere to the more restrictive laws, rules, or regulations. This supplemental specification replaces C&MS 207.
BMP. Temporary sediment and erosion control best management practices.
C&MS. Construction and Material Specifications of the Ohio Department of Transportation dated as shown on the plans.
CECI. Contractor’s Erosion Control Inspector.
CESSWI. Certified Erosion, Sediment, and Storm
Water Inspector sponsored by the Soil and Water Conservation Society and
International Erosion Control Association. Information on certified individuals
is available at www.cesswi.org.
CESSWI
Trained. An
individual that has attended and completed CESSWI
training and is recognized as completing the course by the approved CESSWI Instructor.
The “CESSWI Trained” requirement applies to
all project work taking place after April 1, 2008. Effective July 1, 2009 all “CESSWI Trained” references contained in this specification
will require full CESSWI Certification status.
CPESC. Certified Professional in Erosion and Sediment Control as sponsored by the Soil and Water Conservation Society and International Erosion Control Association. Information on certified individuals is available at www.cpesc.net.
CPESC Trained. An individual that has attended and completed The Certified Professional in Erosion and Sediment Control Exam Review Course and is recognized as completing the course by the CPESC Instructor. The “CPESC Trained” requirement applies to all project work taking place after July 1, 2006. Effective July 1, 2009 all “CPESC Trained” references contained in this specification will require full CPESC Certification status.
Co-Permittee. A requirement of OEPA NPDES Permit (Appendix E of this specification, Part VII. Definitions O).
EDA. Earth Disturbing Activity is any activity that exposes bare ground or an erodible material to storm water, including any “Disturbance” as defined in OEPA NPDES Permit, Part VII, Definition G.
Contractor EDA. Any EDA that is NOT shown on the plans as part of the project. EDA not shown on the plans and occurring within the project limits is also Contractor EDA.
Project EDA. Any EDA that is shown on the plans as part of the project.
Total EDA. Combined Project EDA and Contractor EDA.
EPA. Environmental Protection Agency.
Isolated Wetland Permit. Ohio EPA permit allowing the discharge of fill material into an isolated wetland.
NOI. Notice of Intent.
NOT. Notice of Termination.
NPDES. National Pollutant Discharge Elimination System.
OEPA. Ohio Environmental Protection Agency.
OEPA NPDES Permit. Ohio EPA Storm Water Construction General Permit (OHC 000003) Appendix E of this specification.
OES. Office of Environmental Services-ODOT.
OHWM. The line on the shore established by the fluctuations of water and indicated by physical characteristics such as clear, natural line impressed on the bank, shelving, changes in the character of soil, destruction of terrestrial vegetation, the presence of litter and debris, or other appropriate means that consider the characteristics of the surrounding areas or defined in accordance with the most current version of 33 CFR 328.
OWPCA. Ohio Water Pollution Control Act (Ohio Revised Code 6111.01 et seq.).
PCN. Pre-Construction Notification for 404 permit.
SCD. Standard Construction Drawing.
SWPPP. Storm Water Pollution Prevention Plan.
USACE. United States Army Corps of Engineers.
404 Permit. USACE permit authorizing discharge of fill material into Waters of the US, per Section 404 of the Clean Water Act.
401 Water Quality Certification (401 WQC). Ohio EPA permit authorizing discharge of fill material, per Section 401 of the Clean Water Act.
Waters of the United States. Defined in Code of Federal Regulations, 33 CFR Part 328.
832.03 SCD References. Construct the following features according to the SCDs as listed on the plan title sheet.
Construction Fence........................................................... DM-4.3
Dikes................................................................................. DM-4.3
Filter Fabric Ditch Check................................................. DM-4.4
Inlet Protection................................................................. DM-4.4
Perimeter Filter Fabric Fence............................................ DM-4.4
Rock Channel Protection Type C or D with/without Filter
.................................................................................... DM-4.3/4.4
Sediment Basins and Dams.............................................. DM-4.3
Slope Drains...................................................................... DM-4.3
Construction Entrance (Type 1 Driveway)......................... BP 4.1
832.04 Requirements and Provisions. Furnish a SWPPP to represent compliance with OEPA NPDES Permit (See Appendix E), related rules, specifications, SCD, and permits. The Department will furnish the Contractor a copy of the NOI and the OEPA approval letter at or before the Pre-Construction meeting.
Locate, furnish, install, and maintain temporary sediment and erosion control Best Management Practices (BMP) to represent compliance with the Clean Water Act (33 USC Section 1251 et seq.), the OWPCA, the 404 permit, the 401 WQC, the Isolated Wetland Permit, local government agency requirements, specifications, SCD, and other related rules and permits.
File a Co-Permittee form when the project requires a SWPPP. Information about the Co-Permittee form can be found at www.epa.state.oh.us/dsw/storm/stormform.html. For a copy of the Co-Permittee form see Appendix D. When a co-permittee form is required, furnish the Department with an executed copy of the form submitted to OEPA at or before the Pre-Construction meeting.
Post Construction controls described in Appendix E (section III.G.2.e) are not temporary erosion control features. Construction requirements and compensation for post construction controls are detailed in the project plans. Any illicit or illegal discharge of construction related materials, wastes, pollutants or debris is prohibited.
The following provisions survive the completion and/or termination of the contract.
Provision 1. If a governmental agency or a local governmental authority finds a violation of the above noted requirements, or that the BMP are incomplete, or that the SWPPP is incomplete or that the implementation of the SWPPP is not being performed correctly or completely, full responsibility is borne by the Contractor to make all corrections.
Provision 2. If a governmental agency or a local governmental authority furnishes an assessment, damage judgment or finding, fine, penalty, or expense for a violation of the above noted requirements, or that the BMP are incomplete, or that the SWPPP is incomplete or that the implementation of the SWPPP is not being performed correctly or completely, the Contractor will reimburse the Department within 10 Calendar Days of the amount for any of the above. The Department may withhold the amount of money requested for the above from the Contractor's next pay estimate and deliver that sum to the governmental agency or local governmental authority issuing the assessment, damage judgment or finding, fine, penalty or expense.
Provision 3. The Contractor agrees to indemnify and hold harmless the Department, and will reimburse the Department for any assessments, damage judgment or finding, fine, penalty, or expense as a result of the failure of performing this portion of the Contract. The Department may withhold the amount of any assessments, damage judgment or finding, fine, penalty or expense from the Contractor's next pay estimate.
Provision 4. If a governmental agency or a local governmental authority furnishes a stop work order for any of the following: a violation of the above noted requirements; BMP are incomplete; SWPPP is incomplete; implementation of the SWPPP is not being performed correctly or completely, the Department will find the Contractor in default.
Provision 5. If the Department or any government regulatory agency finds a violation of the above noted requirements, or that the BMP are incomplete, or that the SWPPP is incomplete or that the implementation of the SWPPP is not being performed correctly or completely, the Contractor shall correct and mitigate the conditions within 48 hours of notification by the Department or regulatory agency. Failure to correct non-compliant site conditions may result in the Department suspending work for the entire project until the corrections are performed. Repeated non-compliance with the SWPPP or failure to regularly update the SWPPP as needed to match the site conditions may result in removal of the Contractors Superintendent in accordance with C&MS 108.05.
EDA Requirements. Furnish appropriate BMP for all EDA. Unless otherwise indicated, BMP will be compensated provided that the BMP are installed and maintained appropriately. For projects that do not require a SWPPP as indicated in the table below, furnish a written plan for acceptance by the Engineer that identifies the location, extent and purpose of the BMP proposed. Compensation will not be provided for the written plan.
An
estimated amount is established in the proposal for BMP to be used for project EDA and estimated Contractor EDA
as outlined below:
|
Scenarios for Maintenance Projects (as identified on the Plan Title Sheet) |
|||
|
Project EDA |
Estimated Contractor EDA (acres) [1] |
||
|
EDA = 0 |
0 < EDA < 1 |
1 ≤ EDA < 5 |
|
|
EDA = 0 |
A |
B |
C |
|
0 < EDA < 5 |
B |
B |
C |
|
Scenarios for Non-Maintenance Projects |
|||
|
Project EDA |
Estimated Contractor EDA (acres) [1] |
||
|
EDA = 0 |
0 < EDA < 1 |
EDA ≥ 1 |
|
|
EDA = 0 |
A |
B |
D |
|
0 < EDA < 1 |
E |
[2] |
F |
|
EDA ≥ 1 |
F |
F |
F |
[1] If the actual Contractor EDA in the SWPPP exceeds the estimated Contractor EDA on the Title Sheet resulting in a Total EDA > 1 acre (0.4 ha), use Scenario D.
[2] If project EDA and estimated Contractor EDA are less than 1 acre (0.4 ha), use Scenario E. If Project EDA and Estimated Contractor EDA are greater than 1 acre (0.4 ha), use Scenario F. If the actual Contractor EDA exceeds the estimated Contractor EDA and results in the Total EDA exceeding 1 acre (0.4 ha), use Scenario D.
|
Scenario A: |
No requirements for SWPPP, NOI and NOT. |
|
Scenario B: |
Furnish BMP for Contractor EDA. No SWPPP, NOI or NOT are required. BMP used for Contractor EDA will not be compensated. |
|
Scenario C: |
Furnish a BMP, SWPPP, NOI, and NOT for Contractor EDA only. BMP used for Contractor EDA, SWPPP, NOI and NOT will not be compensated. |
|
Scenario D: |
Furnish a NOI, SWPPP with BMP, and a NOT for all EDA areas. The NOI, SWPPP, BMP, and the NOT will not be compensated. |
|
Scenario E: |
Furnish BMP for all EDA. No SWPPP, NOI or NOT are required. BMP used for the Project EDA will be compensated. |
|
Scenario F: |
Furnish a SWPPP with BMP for all EDA areas and file a Co-Permittee form. The SWPPP and these BMP will be compensated. The Department will furnish a NOI and NOT. |
832.05 Locate and Furnish BMP. Locate and furnish the BMP in accordance with the OEPA NPDES Permit and the SWPPP.
Construct the following items A, B, F, G, H, and I according to the SCD.
A. Perimeter Controls. Furnish filter fabric ditch checks, rock checks, inlet protection, perimeter filter fabric fence, sediment basins and dams, dikes, slope drains, construction entrances and rock channel protection materials as specified on the SCD. Furnish construction ditch and slope protection conforming to the requirements of C&MS Item 670. The seeding and mulching of the mats are not required. The Department may accept other materials as BMP provided the Contractor submits a written proposal for the alternatives to the Engineer.
Use perimeter filter fabric fence to capture construction related sediment carried in sheet flow runoff. Restrict the use of perimeter filter fabric fence to the extent allowed in the OEPA NPDES Permit.
Use dikes to divert and control surface water and sediment flow to prevent discharge of construction related sediment from the project.
Install perimeter filter fabric fence and dikes before any clearing and grubbing operations.
Ensure that the ponding of water behind the perimeter filter fabric fence or dike will not damage property or threaten human health and safety.
B. Inlet Protection. Construct the inlet protection for existing inlets at the beginning of construction and for new inlets immediately after completing the sump. Ensure that the ponding of water behind the inlet will not damage property or threaten human health and safety.
The Contractor may propose modified Inlet Protection controls for Catch Basins and Inlets. Upon approval by the Engineer, the modified Inlet Protection BMP compensation may be made per the unit price for Inlet Protection shown in Appendix F.
C. Construction Seeding and Mulching. Furnish commercial fertilizer, seed, and mulch materials conforming to C&MS Item 659. Apply seed and straw mulch materials according to C&MS Item 659 as modified below.
Apply straw mulch at a rate of 3 tons per acre (0.7 metric ton/1000 m2). Seed and mulch during construction. This BMP may only be installed after March 15 and before October 15. Use wood fiber or compost mulch only with concurrence of the Department. Fertilize construction seeding areas at one-half the application rate specified in C&MS Item 659. If project conditions prevent fertilizing the soil and preparing the seed bed, then the fertilizing and preparation requirements of C&MS Item 659 may be waived. Do not place construction seed on frozen ground. Apply seed for this BMP at the rates shown below:
|
Seed Mixture |
|
|
Fawn Tall Fescue 3.0 lb/1000 ft2 (15 kg/1000 m2) and Annual Ryegrass 2 lb/1000 ft2 (10 kg/1000 m2) |
2 / 1000 ft2 (0.01 ha) |
D. Construction Mulch. Construction Mulch is the application of straw mulch directly on to the disturbed soil surface. Use straw according to C&MS Item 659. C&MS 659 wood fiber or compost mulch may only be used with concurrence of the Department. Apply Construction Mulch only to disturbed areas which will remain idle for 21 days or less or areas of exposed subgrade that require temporary stabilization. Use a mechanical crimping implement or other suitable implement approved by the Engineer when installing Construction Mulch on exposed subgrade. Apply Construction Mulch at a rate of 3 tons per acre (0.7 metric ton/1000 m2).
E. Winter Seeding and Mulching. Apply seed and straw mulch materials according to C&MS Item 659 as modified above. Apply straw mulch at a rate of 3 tons per acre (0.7 metric ton/1000 m2). Winter Seed and Mulch is required for EDA operations occurring between October 15 and March 15 and can only be installed during that time. All straw mulch included in this work must be either crimped in place or installed with a biodegradable Bonded Fiber Matrix. Crimped mulch is required to be anchored into the soil surface with a mechanical crimping implement or other suitable implement approved by the Engineer. The mulch included in this work must be capable of providing sufficient durable protective cover that provides OEPA NPDES Permit compliant erosion control for a minimum of 6 months. The use of other seed and/or mulch materials in this time period requires specific Department approval. The use of winter seeding and mulching is not an acceptable practice for protecting the subgrade surface.
F. Slope Protection. Place dikes, install slope drains, and construct ditches to divert water from bare non-vegetated areas and to protect cut and fill slopes. Protect the side slopes from erosion by placing dikes at the top of fill slopes prior to construction of the slope. Construct ditches and dikes prior to construction of cut slopes to divert runoff away from the slope. Ensure that all sediment-laden discharges from slope protection are directed into an appropriate sediment control BMP.
Furnish Construction Slope Protection at the required locations as the slopes are constructed. Furnish all permanent slope protection as shown in the construction plans when final grade is complete.
G. Ditch Checks and Ditch Protection. Place filter fabric ditch checks or rock checks across a ditch and perpendicular to the flow. Use rock checks to protect the ditch from erosion. Use filter fabric ditch checks to filter sediment from the flowing water.
Place ditch checks as soon as the ditch is cut. If working on a ditch, replace the ditch checks by the end of the workday.
Install filter fabric ditch checks for drainage areas less than or equal to 2 acres (0.8 ha) as shown in the SCD. Install rock checks for drainage areas between 2 to 5 acres (0.8 to 2.0 ha) as shown in the SCD.
Install ditch checks in conjunction with Sediment Basins and Dams.
Furnish Construction Ditch Protection at the required locations as the ditches are cut. Furnish all permanent ditch protection as shown in the construction plans when final grade is complete.
H. Sediment Basins and Dams. Design and construct Sediment Basins and Dams in accordance with and as described in the OEPA NPDES Permit for “sediment settling ponds”. Design and construct Sediment Basins and Dams at concentrated and critical flow locations to settle out sediment before the water leaves the EDA area. When the limits of construction do not allow construction of large Sediment Basins and Dams, substitute a series of smaller basins and dams. Do not construct Sediment Basins and Dams in streams or waterways that carry Waters of the United States.
Complete the construction of the Sediment Basins and Dams before starting EDA operations.
When needed or when directed by the Engineer, construct construction fence around the Sediment Basins and Dams.
I. River, Stream, and Water Body Protection. Protect all streams or water bodies passing through or on the project using the appropriate BMP. River, Stream, and Water Body Protection may include diverting project water flow using dikes and slope protection. The Contractor may use a combination of BMP.
J. Stream Relocation, Temporary Channels and Ditches that carry Waters of the United States. Perform this work in compliance with the OEPA NPDES Permit and any other applicable permits (i.e. 404/401 Permits). Stabilize Stream Relocation, Temporary Channels and Ditches with Construction Slope Protection or 70 percent grass growth before diverting flow into the new channel.
K. Concrete washout areas BMP. Compensation for this BMP is incidental to the concrete work.
L. Construction Entrances. Furnish Construction Entrance materials conforming to C&MS 712.09 Type B Filter Blankets for Rock Channel Protection and C&MS 703.01, Size Number 1 and 2, CCS aggregate. Furnish Construction Entrance protection at the locations shown on the SWPPP and as required below:
1. At locations where construction vehicles enter or leave EDA areas.
2. At all points of egress to public roads.
3. At all access locations where runoff from the construction access road is not checked by sediment controls.
Include the appropriate size culvert as needed to prevent water from flowing onto paved surfaces and from overtopping the entrance road surface.
Install a maximum of three Construction Entrances per mile along the length of the project. The length of the project is the plan length along the project’s longest axis. Department approval is required for additional construction entrances in excess of the maximum.
Locate and identify all Construction Entrances on the SWPPP.
Provide a configuration consisting of 6 inches of aggregate over geotextile fabric. Provide geometry according to a Type 1 Driveway as shown in the SCD. Provide a minimum 10 foot width and length measuring a minimum of 150 feet and not exceeding 200 feet from edge of pavement.
Construction Entrance removal includes the appropriate disposal of geotextile fabric and pipe. Aggregate may be incorporated into embankment work when approved by the Department.
M. Project fueling and refueling BMP locations. Compensation for this BMP is incidental to the project.
N. All other BMP that are required and not specifically referenced in Appendix F will not be paid as a separate item, but will be included by the Contractor as part of the total project cost.
832.06 Causeways and Access Fills (Stream and River Crossings and Fills). Fording of streams and rivers is not allowed. Evaluate the 404/401 permits to determine whether or not causeway and access fills have been permitted by the USACE or OEPA. If a causeway and access fills have been permitted, construct fill(s) per the 404/401 permits, and the application submitted for those permits. Only the surface area (acreage) of temporary fill, and volume of temporary fill as permitted and contained in the permit application will be allowed. The surface area (acreage) of temporary fill, and volume of temporary fill may be furnished in the construction plans. The construction plans may furnish additional information or restrictions for causeways or access fills. The project engineer will consult with the Office of Environmental Services (OES) for any technical questions regarding 404/401 permits.
If the Contractor proposes a causeway and access fill(s) which has not been permitted through the 404/401 permit process, the Contractor is required to coordinate the request for the causeway and access fill(s) with the project engineer and OES. The Department makes no guarantee to granting the request. The causeway and access fills request will be coordinated by OES with the USACE and OEPA where applicable.
Supply the project engineer/OES with the following information:
A. A plan and profile drawing showing the causeway and access fills with OHWM elevation.
B. Volume of temporary fill below the OHWM.
C. The surface area of temporary fill below the OHWM.
D. A restoration plan for the area affected by the causeway and access fills.
E. Time frames for placement and removal of the causeway and access fills.
The time frame allowed for the coordination of the causeway and access fill(s) will be 60 days, at a minimum, and the causeway and access fill(s) will not occur prior to the 404 Permit being authorized by the USACE. All coordination with the USACE and/or OEPA will be performed through OES.
832.07 Causeway and Access Fills Construction and Payment. Begin planning and installing causeways and access fills as early in construction as possible to avoid conflicts with 404/401 permits or other environmental commitments that have been included in the construction plans.
Access fills in streams or rivers may include, but are not limited to, cofferdams, access pads, temporary bridges, etc.
Make every attempt to minimize disturbance to water bodies during construction, maintenance and removal of the causeway and access fills. Construct the causeway and access fills as narrow as practical and perpendicular to the stream banks. Make the causeway and access fills in shallow areas rather than deep pools where possible. Minimize clearing, grubbing, and excavation of stream banks, bed, and approach sections. Construct the causeway and access fills as to not erode stream banks or allow sediment deposits in the channel.
Prior to the initiation of any in-stream work, establish a monument upstream of proposed temporary crossing or temporary construction access fill to visually monitor the water elevation in the waterway where the fill is permitted. Maintain the monument throughout the project. Provide a visual mark on the monument that identifies the elevation 1 foot above the Ordinary High Water Mark (OHWM). If the OHWM is not shown on the plans, the Department will establish the OHWM based on the definition of OHWM (832.02) or the peak discharge from the 2 year event, using the method described in the most current version of the Department’s Location and Design Manual Volume II.
Ensure that the monument can be read from the bank of the waterway. Have this elevation set and certified by an Ohio Registered Surveyor.
Temporary causeway and access fill placed by the contractor above the OHWM are not subject to the 404/401 permit constraints.
Should the water elevation of the waterway, exceed the elevation 1 foot above OHWM, the Department will compensate the Contractor for repair of any resulting damage to the permitted temporary access fill up to the elevation of 1 foot above the OHWM. The Department will not pay for repair and maintenance of temporary access structures that are related to the construction access fill.
Should the water elevation of the waterway exceed the elevation shown on the monument, the Department will recognize this event as an excusable, non-compensable delay in accordance with Section 108.06 of the Construction & Materials Specifications.
All costs associated with furnishing and maintaining the above referenced monument is incidental to the work.
Construct the causeway and access fills to a water elevation at least 1 foot (0.3 m) above the OHWM. If the causeway fills more than one-third the width of the stream, then use culvert pipes to allow the movement of aquatic life. Maintain normal downstream flows. Ensure that any ponding of water behind the causeway and access fills will not damage property or threaten human health and safety.
The following minimum requirements apply to causeways where culverts are used.
A. Furnish culverts on the existing stream bottom.
B. Avoid a drop in water elevation at the downstream end of the culvert.
C. Furnish culverts with a diameter at least two times the depth of normal stream flow measured at the causeway centerline or with a minimum diameter of 18 inches (0.5 m) whichever is greater.
D. Furnish a sufficient number of culverts normal to the flow to completely cross the channel from stream bank to stream bank with no more than 10 feet (3 m) between each culvert.
For all fill and surface material placed in the channel, around the culverts, or on the surface of the causeway and access fills furnish clean, non-erodible, nontoxic dumped rock fill, Type B, C, or D, as specified in C&MS 703.19.B. Extend rock fill up the slope from original stream bank for 50 feet (10 m) to catch and remove erodible material from equipment.
When the work requiring the causeway and access fills all portions of the causeway (including all rock and culverts) and access fills will be removed in its entirety. The material will not be disposed in other waters of the US or isolated wetland. The stream bottom affected by the causeway and access fills will be restored to its pre-construction elevations. The causeway and access fills will not be paid as a separate item but will be included by the Contractor as part of the total project cost.
All environmental protection and control associated with the 404/401 permit activities are incidental to the work within the boundaries of the 404/401 permit or as otherwise identified in the 404/401 permit application.
832.08 Maintenance. Properly maintain all BMP. Dispose of silt removed from BMP according to C&MS 105.16. When the Contractor properly places the erosion control Items then the Department will pay for the cost to maintain or replace these items of work by the following:
If a recorded rain event is greater than 0.5 inches (13mm), the Department will pay to replace all BMP that have failed during the event at the unit price for those BMP including Sediment Removal as described in Appendix F..
Example: A 0.6 inch rain event damaged a 300 ft.
segment of a 900 ft. run of filter fabric fence. The damaged segment was
repaired and the sediment was removed. How do we pay for the 300 ft of repair and sediment removed?
Pay for 300
ft. of new Item Perimeter Filter Fabric Fence and Item Miscellaneous Sediment
Removal.
If a recorded rain event is less than or equal to 0.5 inches (13mm), the Department will pay to remove the sediment per the unit price for Sediment Removal as described in Appendix F. No compensation will be provided for BMP that fail during rain events of less than equal to 0.5 inches (13mm).
For all Perimeter Filter Fabric Fence, Filter Fabric Ditch Checks, Rock Checks, and Inlet Protection, Dikes, remove trapped sediment and any other debris which has accumulated when sediment reaches a height of one-half the BMP. Compensation will be paid at the unit price for Miscellaneous Sediment Removal as described in Appendix F.
When the sediment fills the sediment storage zone (as described in the OEPA NPDES Permit) of a Sediment Basin or Dam, remove deposited sediment per the unit price for Basin Sediment Removal as described in Appendix F. Remove Sediment Basins and Dams after the contributing drainage area has been stabilized.
When erodible materials accumulate at the surface of the construction entrance, furnish additional stone as needed to prevent tracking. Compensation for additional stone needed to maintain the Construction Entrance will be paid at the unit price for Construction Entrance. If tracking occurs, restore and clean the affected roadway surface at no additional cost to the Department.
Remove all BMP before the project is accepted. Dispose of the removed materials including sediment according to C&MS 105.16 and C&MS 105.17. Maintain the BMP until the up-slope permanent grass coverage is 70 percent or better and the site is permanently stabilized in accordance with the OEPA NPDES Permit (See Appendix E, Part VII, Q). At this stage, remove the BMP.
832.09 Storm Water Pollution Prevention Plan. If required, prepare the SWPPP as outlined in this specification. All activity identified by the SWPPP that is not specifically identified as a pay item elsewhere shall be included in the Lump Sum price bid for the SWPPP. At a minimum, the design and information requirements that must be included in the SWPPP are as follows:
A. Provide a site specific SWPPP designed and sealed by a Professional Engineer who is CPESC Trained.
B. Location of the required BMP for both on and off project EDA areas.
C. Furnish quantity totals for all BMP required for the execution of the proposed plan.
D. Location of a minimum of 100 feet (30 m) from the water's edge of any stream, ephemeral stream, wetland, or body of water:
1. Concrete or asphalt plant areas
2. Material and equipment staging or storage areas
3. Dewatering Areas
4. Concrete truck wash out BMP areas
5. Construction access BMP locations
6. Vehicle fueling and refueling locations
E. Furnish an implementation schedule for each construction sequence.
G. Furnish the total EDA areas in acres and identify each drainage area (watershed) impacted by the proposed construction.
H. Locate all slopes that will be inactive for 21 calendar days or longer.
I. Furnish the names of the individuals on site who will serve as the CPESC Trained SWPPP designer and CECI.
J. Describe the type of construction activities that will be taking place.
K. Furnish an estimated quantity for Basin Sediment Removal and Miscellaneous Sediment Removal for removing sediment from Sediment Basins and Dams, inlet protection, ditch checks, rock checks, perimeter filter fabric fence, and all other types of filter fabrics, straw or hay bales, or any other BMP.
L. Furnish signatures of all contractors and subcontractors involved in BMP practices (see Appendix B).
If there are plan sheets which meet any of the requirements in Appendix E, use that information. Design files may be furnished to the awarded Contractor in electronic form upon request.
832.10 SWPPP Acceptance. Furnish the initial SWPPP to the Department for acceptance. The Department will allow work to begin upon receiving an acceptable SWPPP. See Appendix C for a sample acceptance form. The Department may assess critically the following:
A. The type and location of BMP with totals.
B. The SWPPP is for this project.
C. There is no language in the SWPPP about any BMP being directed for use by the Engineer.
D. The total estimated BMP quantities agree with the (per Each) “Erosion Control“ amount identified in the proposal.
E. The SWPPP accounts for the various phases of construction and the associated degree of earthwork disturbance over the life of the project.
F. The SWPPP delineates and identifies the individual watersheds contained within the plan. If topographic mapping contained in the plans is not sufficient to identify and delineate the watersheds associated with the work, provide the appropriate mapping. The appropriate BMP are correctly sized and located in the SWPPP.
G. All perimeter filter fabric fence is identified in the SWPPP and supporting runoff calculations are attached.
H. The SWPPP identifies the locations and specific geometry of the required Sediment Basins and Dams and related control structures. Provide the following information for each Sediment Basin and Sediment Dam:
1. Calculations demonstrating compliance with the 48 hour draw down time (if required by the OEPA NPDES Permit),
2. Size of the contributing drainage area,
3. Volume of the Sediment Storage Zone
4. Volume of the Dewatering Zone (if required by the OEPA NPDES Permit),
5. Basin excavation quantity or dam embankment quantity
6. Quantity of rock channel protection
7. Riser Pipe and outlet structure details (if required by the OEPA NPDES Permit).
Revise the accepted SWPPP as needed to maintain compliance with OEPA NPDES Permit. Revisions and amendments (See Appendix E, Part III, D) to the accepted SWPPP will be at no additional cost to the Department.
832.11 Inspections and SWPPP Updates. Perform the required OEPA NPDES Permit inspections and prepare inspection reports (see Appendix E).
The inspections must be performed by one of the following parties:
A. The CPESC Trained Engineer who signed and sealed the SWPPP.
B. The CPESC Trained inspector who is under the supervision of the Engineer who signed and sealed the SWPPP.
C. The CESSWI Trained inspector who is under the supervision of the Engineer who signed and sealed the SWPPP.
The individual performing the OEPA NPDES Permit inspections is called the Contractor’s Erosion Control Inspector (CECI). Prepare the inspection reports for projects that have a SWPPP. Submit inspection reports to the Engineer every 7 days and within 24 hours of a 0.5 inch (13 mm) or greater rainfall event throughout the life of the contract.
Due to the dynamic nature of the construction activities, the reporting CECI will update, amend and revise the SWPPP as the contractor’s operations and site conditions warrant. Identify all revisions and updates to the SWPPP and indicate what measures will be taken to maintain OEPA NPDES Permit compliance in the report. Include the following in the inspection report; the OEPA NPDES Permit inspection checklist (see appendix E, Part III.G.2.i), a map identifying all BMP needed, installed, maintained or removed since the last inspection report, certification that all construction activities are compliant with the SWPPP and the signature of the CECI responsible for the inspection. The signature of the Professional Engineer who sealed the SWPPP is required as part of the inspection report, on a monthly basis or when modifications to the SWPPP design are made. Include the certification requirements according to OEPA NPDES Permit Part V.H with all reporting sign offs.
A BMP Inventory form is furnished in Appendix A to assist in documenting and recording the BMP quantities for payment. The BMP inventory form in Appendix A is not a substitute for the inspection report described above.
The CECI is required to notify the Department within 24 hours of any compliance deficiencies or verified complaints related to the SWPPP or OEPA NPDES Permit. Within 48 hours of the Department’s or CECI’s notice of deficiency, the contractor is required to construct, install, repair or correct the BMP measures needed to resume OEPA NPDES Permit compliance.
832.12 Compensation. The Department will furnish Item 832 Each, Erosion Control with an amount in the proposal to pay for BMP work. The fixed amount shown in the proposal is included (as any other bid items) in the Total Bid Amount. This fixed amount is the Department’s estimate of the total cost of BMP work required to be performed for the project. If the BMP work exceeds this amount, the BMP work will still be paid at the pre-determined prices. All BMP work will be paid at the proposal pre-determined unit price times the correctly installed BMP number of units. The payment due will be deducted from Item 832 Each Erosion Control. C&MS Table 104.02-2 does not apply to reductions in this contract item.
The Lump Sum amount bid for the SWPPP includes all work associated with development, design, NPDES required inspection, modification, revision, updates, amendments and reporting related to the SWPPP. Changes made to the SWPPP, but not caused by the Department, are the financial responsibility of the Contractor. Additional compensation will only be permitted for Department accepted amendments to the SWPPP resulting from revisions to the contract documents as per sections 104.02.B, 104.02.D and 104.02.F. Provide the additional costs for the amended SWPPP to the Department prior to beginning the associated revised work. All costs associated with providing and maintaining the required CPESC and CESSWI Trained personnel, conducting the NPDES required inspections, and support engineering services are included in the contract Lump Sum bid for SWPPP. The Department will only pay for one accepted SWPPP regardless of the number of Construction phases, revisions, amendments or project redesigns.
The Department will measure the SWPPP as a Lump Sum.
The Department will measure Construction Seeding and Mulching by the number of square yards (square meters).
The Department will measure Slope Drains by the number of feet (meters) of conduit.
The Department will measure Sediment Basins by the number of cubic yards (cubic meters) of excavation.
The Department will measure Sediment Dams by the number of cubic yards (cubic meters) of embankment.
Any pipe required for the outlet structure of a sediment basin or dam is incidental to the unit price paid for Sediment Basins and Dams.
The Department will measure Perimeter Filter Fabric Fence, and Construction Fence by the number of feet (meters).
The Department will measure Filter Fabric Ditch Check by the number of feet (meters).
The Department will measure Inlet Protection by the number of feet (meters).
The Department will measure Dikes by the number of cubic yards (cubic meters) of embankment.
The Department will measure Construction Ditch Protection and Construction Slope Protection by the number of square yards (square meters).
The Department will measure Rock Channel Protection, Type C or D (with or without filter) by the number of cubic yards (cubic meters).
The Department will measure Sediment Removal by the number of cubic yards (cubic meters).
The Department will measure Construction Mulching by the number of square yards (square meters) regardless if the application is crimped or not.
The Department will measure Winter Seeding and Mulching by the number of square yards (square meters).
The Department will measure Construction Entrance protection by the number of cubic yards (cubic meters)
The Department will pay the contract Lump Sum price bid for the SWPPP.
The Department will make partial payments for the Storm Water Pollution Prevention Plan according to C&MS Section 109.09 and as modified by the following schedule:
The Department will release 60 percent of the lump sum amount bid for Storm Water Pollution Prevention Plan to the Contractor with the first regular estimate payable after the Engineer has accepted the Storm Water Pollution Prevention Plan submission.
The Department will release an 30 percent of the lump sum amount bid for Storm Water Pollution Prevention Plan to the Contractor with the first regular estimate payable after 50 percent of the project is complete.
The Department will release the remaining 10 percent of the lump sum amount bid for Storm Water Pollution Prevention Plan to the Contractor with the first regular estimate payable after 90 percent of the project is complete.
The Department will pay for properly installed and accepted BMP per Item 832 Each, Erosion Control. BMP compensation will be based on the unit prices shown in Appendix F.
The Department will not pay for BMP Items which are required as a result of the Contractor's negligence, carelessness, or failure to install permanent controls.
The Department will not pay for BMP that does not provide effective sediment and erosion control for the EDA.
The Department will not pay for any causeway and access fills.
The Department will not pay to replace BMP that have failed as a result of improper maintenance or installation.
The Department will not pay for concrete washout area BMP. Concrete washout area BMP are considered incidental to the concrete work.
The Department will not pay for BMP which are required as a part of the work and are not specifically identified as a separate item. Compensation for BMP that are required for NPDES Permit compliance and are not included in Appendix F of this specification are considered incidental to the work.
Item Unit Description
832 Lump Sum Storm Water Pollution Prevention Plan
832 Each Erosion
Control
