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• ODOT HAWG• Agreement on
Thresholds• Hydroacoustic
Specs• Attenuation• Monitoring and
Reporting• Information needs
for BA
ODOT HAWG
• Members- ODOT, NMFS, USFWS, ODFW, Hamilton Construction
• Training• Communication with
stakeholders• Monitoring protocol• Specifications
– Attenuation– Monitoring
• Research• Information pool• Website
Hydroacoustic info on ODOT FTP site
• Biological Opinions• HAWG Meeting Notes• May 14, 2009 Hydroacoustic Training• Monitoring Reports• NMFS Calculator• ODOT Research• Hammer Blow Counts• Project Photos• References• Specifications• Underwater Noise Monitoring Plan
NMFS Pile Driving CalculatorProject TitlePile information (size, type, number, pile strikes, etc.)
Peak SEL RMS Effective QuietMeasured single strike level (dB) 203 179 190 150Distance (m) 10 10 10
Estimated number of strikes 38
Cumulative SEL at measured distance195
BehaviorPeak RMS dB Fish ? 2 g Fish < 2 g dB
Transmission loss constant (15 if unknown) 206 187 183 15015 6 33 61 4642
N. F. Siuslaw River
Fill in green cells: estimated sound levels and distances at which they were measured, estimated number of pile strikes per day, and transmision loss constant.
** This calculation assumes that single strike SELs < 150 dB do not accumulate to cause injury (Effective Quiet)
Acoustic Metric
Distance (m) to threshold
Cumulative SEL dB**Onset of Physical Injury
00290.34 (c) Specifications
(7) Hydroacoustic
(a) General:
(b) Noise Attenuation System:
(c) Underwater Noise Monitoring Plan, Monitoring, and Reporting:
30000
20000
10000
0
-10000
-20000
-300000 0.02 0.04 0.06 0.08
Time (sec)
Pre
ssu
re (
Pa)
Effect of Bubble Curtain on Pressure
Confined Bubble Curtain
Confined Bubble Curtain
Pile SleevePile Sleeve
Bubble RingBubble Ring
Must extendMust extendabove surfaceabove surface
Must contact bottomMust contact bottom
Monitoring and Reporting
• Which projects need monitoring?
• WSDOT Protocol
• ODOT Protocol• Reporting
Information needs for the BAInformation needs for the BA
• Vibratory hammer and/or impact hammer detail.• Type of pile (coal-tar/zinc coated pile need to be sealed)• Size of pile <24”>.• Number of piles (in-water/out of water).• Estimated number of pile strikes per day.• Life-history stages present in the Action Area.• Monitoring data from previous projects with similar site
conditions?• Aquatic habitat types where piles will be driven (scour pools,
riffles, estuary, etc.).• Substrate data from geo-tech report.• Pile driving plan.• Monitoring plan/report, if needed. Template in the works.• In-water work timing (variance may be needed).
1. Size and type of piles.2. A detailed description of the bubble curtain, including design specifications.3. The impact hammer force used to drive the piles.4. A description of the monitoring equipment.5. The distance between hydrophone and pile.6. The depth of the hydrophone.7. The distance from the pile to the wetted perimeter.8. The depth of water in which the pile was driven.9. The depth into the substrate that the pile was driven.10. The physical characteristics of the bottom substrate into which the piles were
driven.11. The ranges and means for peak, RMS, and SEL’s for each pile.12. The results of the hydroacoustic monitoring, including the frequency
spectrum, peak and RMS SPL’s, and single-strike and cumulative SEL with and without the attenuation system.
13. A description of any observable fish or bird behavior in the immediate area will and, if possible, correlation to underwater sound levels occurring at that time.
Information Needs for a Monitoring Information Needs for a Monitoring Report….Report….
Web links:
• ODOT hydroacoustic website:ftp://ftp.odot.state.or.us/techserv/geo-environmental/Biology/Hydroacoustic/
• WSDOT hydroacoustic information:http://www.wsdot.wa.gov/Environment/Biology/BA/BAguidance.htm
Illustrations courtesy of:Bud Abbot, Environ CorporationJohn Stadler, NMFSJim Laughlin, WSDOT