WWPI / WPC/ SPTA / TWC Impact Assessment Model€¦ · Micronized Copper Quat (MCQ) Preservatives...
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WWPI / WPC/ SPTA / TWC Impact Assessment Model Western Wood Preservers Institute Dallin Brooks
Transcript of WWPI / WPC/ SPTA / TWC Impact Assessment Model€¦ · Micronized Copper Quat (MCQ) Preservatives...
WWPI / WPC/ SPTA / TWC
Impact Assessment Model
Western Wood Preservers Institute Dallin Brooks
NOAA ESA and EFH guidance difficult to interpret and apply to specific projects.
Parks Canada?
Smaller projects need a tool to demonstrate that the use of treated wood in aquatic environments, in many situations, has no significant or measurable impact.
Provides basis for sound environmental review of specific projects by regulatory agency staff.
Why Develop An Environmental Impact Assessment Model?
Preserved Wood in Aquatic Environments
Three Levels Of Assessment
- Level One Screening Assessment - Level Two Intermediate Risk Assessment - Level Three Full Risk Assessment
Foot, Road and Railroad Bridges Boat Docks Marinas and Wharfs Piling Dikes
Examples of Projects Suitable for Level One Screening Assessment
Retaining Walls, Sea Walls, Dolphins Foot, Rail and Road
Bridges w/Abutments
Examples of Projects for Level Two and Three Risk Assessment Model
Purpose Tool to support consistent, objective decisions in
evaluating effects of use of treated wood in aquatic environments
Users Project proponents, action agencies, and reviewing
agencies
Method Utilizes peer-reviewed water quality model output
that has been tabulated and presented in a worksheet for screening simple project
Screening Level Assessment Process & Worksheets
Water-borne preservavtives Ammoniacal Copper Zinc Arsenate
(ACZA) Chromated Copper Arsenate (CCA) Copper Azole (CA- B & C) Alkaline Copper Quat (ACQ) Micronized Copper Quat (MCQ)
Preservatives that can be Assessed
Oil-type preservatives
Pentachlorophenol Creosote Copper Naphthenate
Preservatives that can be Assessed
The Box Model
Immersed treated piling
Water depth (cm)
Box length = length of the structure (cm)
Current Vector Vss or Vmodel
Contaminant concentrations are determined by background concentrations and inputs from the pressure treated wood that are diluted by the water flowing through the box
Contaminant inputs include rainwater runoff from overhead treated wood and direct inputs from immersed treated wood
Contaminant Trajectories
h
Distance from pile = D
Piling
Piling
Contaminant trajectories
Waterline
= 0.5 *Vmodel
Current
Current Vector Settling Velocity
(Vv)
Distribution of Preservative Lost from an Overhead Structure in Rainwater Runoff
Dripline of bridge
20 cm deep initial dilution zone
Sediment dilution zones in cm equals 400*current speed (cm/sec)
Depth (d) -20 cm
Depth (d)
1. “no effect” determination
2. “no effect” determination with specific special conditions
3. “may affect, not likely to adversely affect” determination which may allow informal consultation;
4. “may affect, not likely to adversely affect” with specific special conditions determination can be made which may allow informal consultation;
5. “likely to adversely affect” determination which will require formal consultation.
Model Leads to One of Five Determinations Regarding Consultation
Figure 2: Assessment Framework
Review Categorical Approvals
Level One Screening Assessment
No Effect Determination
Level Two Intermediate Risk Assessment
Level Three Full Risk Assessment
No Effect Determination
Meets Criteria
Meets Criteria
Not Likely to Adversely Affect
Determination
Meets Criteria
No
No
No
Not Likely to Adversely Affect
Determination
Meets Criteria
No Modify Project or
Likely to Adversely Affect Determination
LEVEL 1 ASSESSMENT
ASSUMPTIONS
Level 1 Screening Assessment
Project Information - Design
- Preservative
Site Information - Physical - Chemical - Biological
Lookup Tables Generated by
Leaching Models Next Level of
Assessment Needed
No Effect Determination
Level 2 Intermediate Risk Assessment
Level 3 Full Risk Assessment
OR AND
Figure 3 Level One Screening Assessment
Copper Based Preservatives
Creosote Based Preservatives
Penta Treated Preservatives
Copper Screening
Assessment
Creosote Screening
Assessment
Penta Screening Assessment
Mixed Preservatives
Separate Project
by Preservatives
(See Figure 3-A and
Worksheets 1 or 2)
(See Figure 3-B
and
Worksheet 3)
(See Figure 3-C and
Worksheet 4) (For Copper Overhead Decking and Piling
Treated with Creosote or Penta, see
Worksheet 5)
Level 1 Screening Assessment
Exposure Can Be Assessed for: Submerged piling and overhead decking Overhead Wood Structures (Bridge deck) In Both Marine and Fresh Water
Key Factors For Performing Assessment # of Piling in Row Parallel to Current Square Footage of Project Area Current Speed Redox and pH
Products Treated to Industry BMPs
Project Assessment
PROJECT SCREENING LEVEL ASSESSMENT AND WORKSHEET EXAMPLES
Step 1: Complete Project Information Form Step 2: Preliminary Assessment of Risk (Figure
2, page 15 in Workbook)
Step 3: Complete Assessment Worksheet
SECTION 4: LEVEL ONE PROCEDURES
PROJECT APPLICATION FORM
300’ long x 6’ wide (1,800 sf.) wood deck float 10 piling in row (example dock on right)
SCREENING ASSESSMENT FLOATING PIER EXAMPLE
Marine Application
CCA Piling ACQ Treated Overhead Decking
SCREENING ASSESSMENT FLOATING PIER EXAMPLE
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SITE SPECIFIC DATA
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LEVEL 2 INTERMEDIATE RISK ASSESSMENT
Project Information - Design
- Preservative
Site Information - Physical - Chemical - Biological
Apply Peer-Reviewed Risk
Assessment Models Next Level of
Assessment Needed
No Effect Determination
Level 3 Full Risk Assessment
OR AND
Poston Box model
WWPI Brooks model
LEVEL 2 CONSIDERATIONS
LEVEL 2 CONSIDERATIONS
LEVEL 3 CONSIDERATIONS
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Splash Screen
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Modelling Tool Page – upon first loading
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Modelling Tool Page – inputs entered, water impact results visible
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Modelling Tool Page – inputs entered, preservative drop-down list
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Modelling Tool Page – other inputs, sediment impact results visible
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PDF report export (opens in new tab)
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Log-in Page
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My Accounts Page – access saved sessions
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Modelling Tool Page – saved session loaded (Dallin’s Demo for WPC)
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(Help Content) Input Definitions Page
QUESTIONS AND DISCUSSION
Model To Be Hosted By: Oregon State University Environmental Performance of Treated Wood Co-op Currently at http://wwpi-cms.upshift.co.nz/
CONTACT INFORMATION: Dallin Brooks Western Wood Preservers Institute [email protected] 360.823.3898
