HomeMy WebLinkAbout2002-10-07 Sound Study 1 National Grid
August 16, 2002 National Grid USA Service Company,Inc.
Clay Mitchell, Interim Planning Agent Daniel McIntyre, P.E.
Town of North Andover Principal Engineer
27 Charles Street
North Andover, MA 01845 RECEIVEDL,
Dear Mr. Mitchell: AUG 4 9 2002
NORTH ANbdVER �v
R-ANNINq PEPARTMENT
Re: Planning Boat-d Submittal
Foster-Stt•eet Electt-ic Substation
New England Poiver Company
Enclosed please find the following information requested for New England Power Companys' proposal to
construct an electric substation off Foster Street.
• Sound Study dated February 4`f' 2002
• Enlarged plan of driveway entrance landscaping
Should you have any questions or require additional information, do not hesitate to contact me
at 508-421-7674.
Respectfully,
Daniel McIntyre, P.E.
MEMORANDUM
I
TO: Andres J.Molina Northboro DATE: February 4. 2002
OM: George A. Cook Worcester FILE: LR(M) 1558
SUBJECT: SOUND STUDY - PROPOSED WOODCHUCK HILL SUB, NORTH ANDOVER, MA
Daytime and night-time ambient measurements were made in the vicinity of the proposed Woodchuck
Hill Substation, Forest Street, North Andover MA. The daytime and night-time measurements were
taken on January 24 and January 28,2002 respectively. These measurements were made using a CEL-
393 Precision Sound Level Meter. The A-Weighted sound pressure measurements are in dbA.
The meteorological conditions at the time of the surveys were:
Daytime: 11:00 am to 1:00 pm Partly cloudy, 48 degrees, Wind 0 to 5 mph
Night-time: 12:00 am to 1:30 am Clear, 37 degrees, Wind 4 to 8 mph
Daytime ambient ranged from 43 to 44 dBA. Night-time ambient ranged from 41 to 42 dBA.
Ambient noise was influenced by distant road traffic, chirping birds, and wind moving pine tree
branches.
The table below list the expected noise levels to be produced from two transformers. The level are
based on distances using the new substation layout site plan (Accessors Map: 104B-Parcel 28). The
calculations show an increase in the expected noise level configuring two transformers over using a
. single transformer. However, these levels are significantly lower than the measured ambient noise
levels.
Attached is an Excel shect showing the values used in arriving at the predicted noise levels at the
residences. The calculations were made based on two 24MVA transformers, with a sound level of 62
dBA (10dBA attenuation from standard).
Location Noise Level in dBA
Location 1 nearest residence (south of Sub)
Ambient day time 43 to 44
Ambient night time 41 to 42
Predicted level from substation 32.4
Location i nearest residence (north of Sub)
Ambient day time 43 to 44
Ambient night time 41 to 42
Predicted level from substation 27.2
Should you have any questions, please call me at ext. 36388 in Worcester
�'Wzt 4 - ODZ4
• c: Robert D. Archambeault
Joseph R. Sierra
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