January 28, 2008ODOT Central Office – Room 1C
Post-Construction BMPs
Update Meeting
Post-Construction BMPs
Introductions
Bill Ujvari, P.E. – Production Administrator, Central Office Production
Mike Wawszkiewicz, P.E. – Hydraulic/Roadway Designer, Central Office Production
Please feel free to ask questions during the presentations.
L&D Manual, Volume 2 Revisions
Revisions published January 18, 2008 Today’s Topics
Implementation Plan – IOC (included in hand-outs)
Notable revisions to post-construction BMP Sections in the L&D Manual
Local-let and ODOT-let BMP BMP Design Approach BMP Submittals to Central Office OEPA Notices of Violation Training Needs
Implementation Plan –Projects Scoped after January 18, 2008
Include post-construction BMP based on January 2008 L&D Manual, Vol. 2
Implementation Plan –Projects Scoped Prior to Jan. 18, 2008
Follow these steps:
Step 1 Determine if post-construction BMP are
needed based on January 2008 L&D Manual, Vol. 2
If post-construction BMP needed, continue to Step 2
If post-construction BMP are not needed, no further action needed
Implementation Plan –Projects Scoped Prior to Jan. 18, 2008
Implementation Plan –Projects Scoped Prior to Jan. 18, 2008
Step 2 Determine the answers to the following:
Has the project received Stage 1 plan approval prior to January 18, 2008?
If there was no Stage 1 submittal, has the project received Stage 3 plan approval prior to January 18, 2008?
Were the right-of-way tracings completed prior to January 18, 2008?
If “No” to all of the above, design BMPs according to the January 2008 L&D Volume 2
If “Yes” to any of the above, continue to Step 3
Implementation Plan –Projects Scoped Prior to Jan. 18, 2008
Step 3 Is existing and/or proposed right-of-way
available to incorporate post-construction BMPs meeting the January 2008 L&D Volume 2 BMP requirements for all or part of the project?
If “Yes”, incorporate BMPs according to the January 2008 L&D Volume 2 and continue to Step 4
If “No”, continue to Step 4
Implementation Plan –Projects Scoped Prior to Jan. 18, 2008
Step 4 Based on BMPs incorporated within
available existing and/or proposed right-of-way in Step 3, is the project 100% compliant with the January 2008 L&D Vol. 2?
If “Yes”, no further action needed If “No”, continue to Step 5
Implementation Plan –Projects Scoped Prior to Jan. 18, 2008
Step 5 Document restrictions preventing full
compliance with the January 2008 L&D Vol. 2.
Cost and Schedule Impacts Percent of project treated with BMPs Environmental and Right-of-way impacts Other Impacts
Implementation Plan –Projects Scoped Prior to Jan. 18, 2008
Step 5 cont. Submit documentation to Central Office
Production for coordination with Ohio EPA
Ohio EPA will consider each project with ODOT and determine possible options that will resolve non-compliant areas of a project
Global settlement Mitigation within the same watershed
Notable changes in January 2008 edition of L&D Volume 2
Stream Protection – 1105.2 Bankfull culvert design method “Water quantity”/”Stream Protection”
Notable changes in January 2008 edition of L&D Volume 2
Notice of Intent (NOI) – 1112 Projects with estimated contractor and
Project Earth Disturbed Area (EDA) less than one acre do not require an NOI or post-construction BMP
Updated Figure 1112-1 (NOI Calculator)
Notable changes in January 2008 edition of L&D Volume 2
Notice of Intent (NOI) – 1112 cont. Example #1: Bridge replacement
project with 0.5 acres of Project EDA and an estimated 0.2 acres of Contractor EDA
Add SS832 and Item 832 Erosion Control (each) to plans
SWPPP quantity is not needed NOI is not needed
Notable changes in January 2008 edition of L&D Volume 2
Notice of Intent (NOI) – 1112 cont. Example #2: Bridge replacement project with 0.7
acres of Project EDA and an estimated 0.25 acres of Contractor EDA
Add SS832 and Item 832 Erosion Control (each) to plans
Based on site conditions, work type, etc., determine level of confidence with Contractor EDA estimate
If the Contractor EDA could reasonably exceed the estimate and result in the total EDA being greater than 1 acre
Provide a Project Site Plan, Item 832 SWPPP (Lump Sum), Item 832 Erosion Control (Each), and file the NOI
Notable changes in January 2008 edition of L&D Volume 2
Notice of Intent (NOI) – 1112 cont. Example #2 Variation: Bridge replacement project
with 0.7 acres of Project EDA and an estimated 0.25 acres of Contractor EDA
It is determined that 0.25 is a reasonable estimate for Contractor EDA
However, the Contractor uses more area and the resulting EDA is greater than one acre.
What happens now? SS 832 is being updated. The update will
require the Contractor to file the NOI and obtain the Permit, if he cannot constrain his operations to what is shown on the title sheet.
Notable changes in January 2008 edition of L&D Volume 2
Notice of Intent (NOI) – 1112 cont. Routine Maintenance Activity list
provided Multiple part and non-contiguous
projects Non-contiguous projects separated by at
least ¼ mile can be considered separate Non-contiguous multiple part projects can
be considered with respect to each part
Notable changes in January 2008 edition of L&D Volume 2
Notice of Intent (NOI) – 1112 cont. Watershed Specific Permits
Big Darby Creek and Olentangy River Additional requirements
Groundwater Riparian Setback Temporary Sediment Basin Locations
Coordinate with Central Office Production
Notable changes in January 2008 edition of L&D Volume 2
Post-Construction BMP – 1115 Post-construction BMP requirements
apply to ODOT and LPA projects Redevelopment vs. New Development
Area within existing ODOT right-of-way is considered impervious for BMP calculations
Notable changes in January 2008 edition of L&D Volume 2
Post-Construction BMP – 1115 cont. Options for locating BMP based on
treating 100% water quality for 20% of the Project EDA (redevelopment)
Water quantity treatment not required when less than 1 acre of new impervious area created
Notable changes in January 2008 edition of L&D Volume 2
BMP Selection and Submittals – 1116 Submittals to Central Office Production
Conceptual layout Plan sheets with BMP located Calculations/documentation
No treatment for areas with sheet flow off roadway and outside ODOT right-of-way
Notable changes in January 2008 edition of L&D Volume 2
BMP Toolbox – 1117 Exfiltration Trench
Updated Figure 1117-1 Manufactured Systems
Not suitable for large trunk sewers Depth limitations due to maintenance Permit Reviews – Watch for use of
manufactured systems on ODOT maintained roadways. Verify maintenance accessibility.
Notable changes in January 2008 edition of L&D Volume 2
BMP Toolbox – 1117 cont. Vegetated Biofilter
No conveyance ditch No energy protection area Bottom width determination (ignore
rounding) Use the entire contributing drainage area
(No incremental treatment) Maximum ditch bottom width of 10 feet
Updated Anti-Seep collar design requirements
Local-let and ODOT-let LPA Projects
ODOT-let LPA projects ODOT files the NOI
ODOT should ensure post-construction BMP provided meeting Ohio EPA expectations
LPA should be made aware of BMP requirements and maintenance responsibilities
Local-let and ODOT-let LPA Projects
Local-let LPA projects Local agency files the NOI
The LPA is responsible for providing post-construction BMP that meet Ohio EPA expectations (may use L&D Volume 2 or other EPA approved guidance)
ODOT’s global settlement negotiations do not apply to local-let LPA projects that cannot meet BMP requirements
The LPA must coordinate with Ohio EPA when deficiencies are identified
Local-let and ODOT-let LPA Projects
BMP Project Scenarios Document This document should no longer be
used as a guideline Post-construction BMP apply to the
entire project with the exception of privately owned property (non-municipal)
BMP Design Approach
Using Redevelopment/Treatment Percent reduction New Construction Projects
Calculate treatment percent (T%) Minimum T% is 20%
Redevelopment Projects 20%
BMP Design Approach
BMP Design Options Redevelopment projects
Provide 100% treatment for an area equal to 20% of the Project EDA
Provide 20% treatment for the entire project.
New construction projects Provide 100% treatment for an area equal
to T% of Project EDA Provide T% treatment for the entire
project.
BMP Design Approach
Vegetated Biofilters The entire project does not require
wider ditches Water quality credit earned for
drainage area within ODOT right-of-way Once area credit equals or exceeds the
20% or T% requirement, no further treatment is needed
Vegetated Biofilter Example (Redevelopment)
BMP Design Approach
Exfiltration Trenches (ExT)
Option #1 – Use 20% or T% of the required ExT length for the entire project
Requires all inlets, catch basins, etc. to provide an exfiltration trench or other BMP treatment
BMP Design Approach
Exfiltration Trenches (ExT) cont.
Option #2 – Use 100% of the calculated ExT length based on Section 1117.1 and provide treatment for ODOT R/W area that equals or exceeds 20% or T% of the Project EDA.
Allows the locations of BMP to be chosen when there are restrictions preventing BMPs at all inlets.
Exfiltration Trench Example (Redevelopment)
BMP Design Approach
Manufactured Systems
Option #1 – Calculate Water Quality Flow (WQf) and multiply the WQf by 20% or T%.
Entire contributing drainage area to the point in the storm sewer shall be used
Treat the entire project - Any project areas not tributary to this manufactured system must be drained to a BMP that will provide 20% or T% treatment
BMP Design Approach
Manufactured Systems
Option #2 – Calculate Water Quality Flow (WQf)
Entire contributing drainage area to the point in the storm sewer shall be used
Treat drainage area with a minimum area equal to 20% or T%, with no reduction in the calculated WQf.
Water quality credit only applies to area within ODOT R/W, but BMP must be sized for entire contributing drainage area
Manufactured Systems
BMP Submittals
Section 1116.2
Consideration of post-construction BMPs needs to happen early in the design process to allow for utilities and right-of-way issues to be addressed.
Early coordination with Ohio EPA will prevent fines, additional consultant costs, change orders and possible delays during construction.
BMP Submittals
Major Projects
Conceptual layout with Step 6 (AFA) – Required review and comment through C.O. Production
BMP Design with Step 8 (Stage 1) – Required review and comment through C.O. Production
BMP Submittals
Minor Projects
Conceptual layout with Step 3 (PE) – Optional review and comment through C.O. Production
BMP Design with Step 4 (Stage 1) – Required review and comment through C.O. Production
BMP Submittals
Contents of submittals at Stage 1 Estimated Project EDA Pre and Post Runoff Coefficient Pre and Post Impervious Area BMPs selected Calculations for BMPs Plan sheets showing location of BMPs Explanation for areas that were not
treated
BMP Submittals
Project Site Plan – Stage 3
Post-construction BMPs should be addressed on the Project Site Plan
Graphics Tables Cross-references to specific sheets or
details Narrative, if needed
BMP Submittals
Projects that are not fully compliant
C.O. Production will discuss with the District and Consultant.
If necessary, a meeting with Ohio EPA will be held to determine whether additional mitigation is required.
Issues during Construction
What happens when Ohio EPA issues a Notice of Violation (NOV) that cites a post-construction deficiency? District should determine if post-construction
BMPs were incorporated into the plans If post-construction BMPs are shown in the
plans, District shall obtain the calculations District shall determine whether the BMPs
shown in the plans were designed according to the Jan. 2008 L&D Manual Vol. 2
If deemed compliant, forward calculations to Ohio EPA
If deemed non-compliant, forward to C.O. Production for coordination with Ohio EPA
Post-Construction BMP Training
Training for Post-Construction BMPs Districts
Need to take the lead in communicating changes with BMPs for plans actively in design
Districts should coordinate with Central Office for assistance on unique situations
Consultants Submittals, reviews, and experience should
identify any potential training needs Future training may be needed, but minimum
benefit now
Coming soon….
Renewal of Construction General Permit Draft version available for public
comment Anticipated that the Permit will be
effective in April 2008 Minor changes to post-construction
Draft Permit allows mitigation off-site (must be negotiated with Ohio EPA)
Covered by January 2008 L&D Vol. 2 updates
Coming soon….
SS832 revision Addressing changes to Construction
General Permit and January 2008 L&D Volume 2
Anticipated update in first half of 2008
Coming soon….
L&D Volume 3 Update Addressing changes to January 2008
L&D Volume 2 Anticipated update in first half of 2008
Coming soon….
Olentangy Watershed Permit Final version yet to be completed by
Ohio EPA Anticipated that the Permit will be
effective later in 2008 Riparian Setback modifications Temporary Sediment basins Coordinate through Central Office
Production
Summary
Follow Implementation Plan for all projects
Provide BMPs for Local-let and ODOT-let LPA Projects
Revisions allow flexibility in locating Vegetated Biofilters, ExTs, etc.
Summary
No NOI or post-construction BMP for projects with less than one acre of total EDA
BMP Submittals to Central Office Production are required
Notice of Violation letters require prompt response
January 28, 2008 BMP Meeting
Any Questions or Comments?
Questions/Suggestions regarding Post-Construction BMPs Mike Wawszkiewicz
ODOT C.O. [email protected]