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October 2,2002
File No. 24-99-014-005-05
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Ms. Shandra O'Haleck
NOAA Fisheries
510 Desmond Drive SE
Suite 102
Lacey, W A 98503
JEFFERSON COUNTY
DEPT. OF COMMUNITY DEVELOPMENT
Subject: Port Ludlow Marina Expansion
COE Permit No. 2001-101151
Dear Shandra,
As we discussed at our on-site meeting of September 17, 2002, Port Ludlow
Associates agrees to the following condition regarding the measurement of noise
impacts from use of an impact hammer during pile driving as part ofthe marina
expansion project:
1. Underwater sound levels will be monitored at3 meters depth and 10 meters
distance from the pile driving site. If hydroacDustic monitoring from thefirstfive
piling do not indicate sound levels exceeding 150 dB (re: IflPa)at three meters depth
and 10 meters distance from the pile, no additional hydroa co us tic monitoring is
needed as pile driving continues. The energy to drive the first five piles shall be
representative of the maximum energy used on the subsequent piles. If levels exceed
150 dB (re: 1 flPa) 50% of the time or less but does not exceed 180 dB (re: 1 flPa)
during the first five piles, pile driving may continue along with continued
hydroacoustic monitoring or, at Port Ludlow Associates option, pile driving may
continue without hydroacoustic monitoring with the use of an appropriate sound
attenuation minimization measure as discussed below. If levels exceeded 150 dB (re:
1 flPa) more than 50% of the time or exceeded 180 dB (re: 1 flPa) during the first five
piles, pile driving may only continue with the use of an appropriate sound attenuation
minimization measure as discussed below. Port Ludlow Associates shall notify the
COE and NOAA Fisheries of the hydroacoustic monitoringfrom thefirstfive piles
within 72 hours.
2. Based on the outcome of the above describedhydroacoustic monitoring, an
appropriate sound attenuation minimization measure, such as one of the following,
shall be employed. '. Methods to minimizethe underwater soundpressure level may
include reducing the force of each strike, or attenuating the underwater sound by
enclosing the Pile in an air bubble curtain or pile sleeve.
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Engineers
p tanners
Surveyors
Woshington
Oregon
Alosko
Reid Middleton, Ine.
728 134th Street SW
Suite 200
Everett, WA 98204
Ph: 425741-3800
Fox: 425741-3900
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. Ms. Shandra 0 'Haleck
NOAA Fisheries
October 2, 2002
File No. 24-99-014-005-05
Page 2
3. A report shall be submitted to the COE and NOAA Fisheries within 30 days of
completion of the project that presents the results of the hydroacoustic monitoring
conducted during the project. The following data shall be provided in the report: size
and type of pile; approximate energy supplied to the pile; frequency and amplitude of
the underwater sound; angle of the pile; water depth; distance from shore or
bulkhead; and type and depth of substrate.
It is our understanding that this condition is related only to use of an impact hammer -
if a vibratory hammer is used, the condition will not apply. We also understand that if,
prior to the time this project goes to construction, NOAA Fisheries or other regulatory
agencies have new information which demonstrates that noise will not be an issue with
the size of piling proposed, that this condition will not apply.
Thank you for your work on this project. If you have any further questions or disagree
with the condition or our understandings as stated in this letter, please let me know as
soon as possible.
Sincerely,
Reid Middleton, Inc.
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Shannon Kinsella, P .E.
Senior Engineer
sjs\24Wf\99\0 14Portludlow\PLA WORK\NMFSlttrpilingcondition.doc
cc: Susan Glenn, U.S. Army Corps of Engineers
Randi Thurston, W A State Department ofFish and Wildlife
Josh Peters, Jefferson County Dept. of Community Development
Mark Dorsey, Port Ludlow Associates
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