HomeMy WebLinkAbout3528; Vista/Carlsbad Interceptor Sewer; Vista/Carlsbad Interceptor Sewer VC5B-VC11A; 1999-05-01pen.
AMBIENT NOISE STUDY
Vista/Carlsbad Interceptor Sewer Reaches VC5B to
VC11A and South Carlsbad Storm Drain Projects
(CMWD Project No. 91-403)
Study Area:
CITY OF CARLSBAD
May 1999
Prepared for:
MALCOLM PIRNIE, INC.
1902 Wright Place, Suite 180
Carlsbad, CA 92008
Prepared by:
DHK ENGINEERS, INC.
1851 Skyhill Place
Escondido, CA 92026
(760) 747-9553
INTRODUCTION
The Carlsbad Municipal Water District (CMWD) is in the planning and design phase on
several sewer and storm water projects within the Carlsbad city limits. CMWD has
authorized an assessment of the current ambient noise within the project area to assist the
Design Engineer and Contractor in developing design and construction methods to
minimize the impact within the project area.
NOISE BACKGROUND
Community noise levels are measured in terms of the "A-weighted decibel" abbreviated
dBA. A-weighing is a frequency correction that correlates overall sound pressure levels
with the frequency response of the human ear. The "equivalent noise level" or Leq is the
average noise level on an energy basis for any specified time period. The Leq for one hour
is the energy content (acoustic energy) of the sound. It can be thought of as the level of a
continuous noise which has the same energy content as the fluctuating noise level. The
equivalent noise level has the units of dBA, therefore, a sound measured for one hour may
be expressed as a one hour Leq of 57 dBA. General "rules-of-thumb" to understand
acoustical/noise analysis are: 1) an increase of 3dbA is a "doubling" of perceived noise, 2)
a decrease of 3 dbA is a 50% reduction of perceived noise, and 3) an increase in distance
from the source will decrease the perceived noise.
NOISE SURVEY METHODOLOGY
An ambient noise survey was conducted in the area on April 28-30, 1999 to document
existing levels of noise. Six monitoring locations (Appendix A), representative of the
noise-sensitive receptors were identified along the potential alignments. Each selected
noise location was monitored six times during the study period. Three monitoring events
were completed between the typical construction period of 7:00 AM to 7:00 PM and three
events were completed between evening and night hours of 7:00 PM to 7:00 AM.
Noise Monitoring locations #1- #3 A are associated with the Vista/Carlsbad Interceptor
alignments and Noise Monitoring locations #4 and #5 are associated with the Storm Drain
Improvements. Photographs of each noise monitoring location is provided in Appendix B.
Project site maps are provided in Appendix C which identify the six noise monitoring
locations. A brief description of each monitoring location and the types of sounds heard
during the survey are presented below:
Noise Monitoring Site #1: The northeast corner of Jefferson Street/ Knowles Avenue
was selected to provide a noise baseline for the north terminus of the proposed project. In
the immediate area, several high density residential units and child care facilities were
adjacent to Jefferson Street. Traffic noise (e.g., acceleration and deceleration), children
playing and train and aircraft noise were the predominate noise features within the areas of
influence around Site #1.
Noise Monitoring Site #2: Located approximately 1/4 mile south of Site #1, the
southwest corner of Jefferson Street and Arbuckle Place selected based on the optimal
CMWD Project No. 91 -403 1
May 1999
construction for micro-tunneling. The monitoring location was adjacent to an office
building and houses. Traffic noise (e.g., acceleration and deceleration), children playing
and train/aircraft noise were the predominate noise features within the areas of influence
around Site #2.
Noise Monitoring Site #3: Jefferson Street and Oak Avenue was selected based on the
potential micro-tunneling location. Site #3 is approximately midway between the Pine
Avenue Elementary School and Carlsbad Village Drive. Traffic noise (e.g., acceleration
and deceleration), children playing and train and aircraft noise were the predominate noise
features within the areas of influence around Site #3.
Noise Monitoring Site #3A: The proposed construction staging area Oak Avenue /
Madison Street was selected as monitoring location and is approximately two blocks west
of Site #3. Similar to Site #3, the traffic noise, children playing, and train noise were the
predominate noise characteristics.
Noise Monitoring Site #4: Approximately 1/4 mile south of Site #3 A, the north west
corner of Madison Street and Chestnut Avenue was selected. The predominate noise was
local traffic, children playing at the nearby school and the train noise.
Noise Monitoring Site #5: The northeast corner of the intersection of Tamarack
Avenue and the railroad crossing was selected. The predominate noise was train
operations and local traffic.
Continuous measurements of the A-weighted sound level were made over a 30-minute
period using QUEST Model 2800 sound level meter. The instrument was equipped with
optional circuitry and microphones to permit them to meet the requirements of ANSI SI.4
for Type II precision sound level meters. The Bruel & Kjaer (B&K) Type 4936
prepolarized random incidence microphone are integral of the noise meter. The noise
meter was positioned at a height of about 5 feet above the ground. The sound meter was
setback from the street and approximate distance as the residential setback. Typically the
setback was 15 to 30 feet. Foam windscreens, 3-1/2 inch diameter, were used to minimize
wind-generated noise.
The calibration levels of the instrument were checked before and after each monitoring
period, using a Quest QC-10 sound level calibrator. All intermittent calibrations were
verified and were within the normal error band. Calibration certificates are provided in
Appendix D.
The instrument was programmed to measure and record the equivalent sound level (Leq)
for each 30-minute session, as well as store the maximum and minimum sound levels.
CMWD Project No. 91-403
May 1999
NOISE SURVEY RESULTS
The noise survey provided and confirmed typical ambient noise characteristics associated
with residential areas and highly traveled roadways. As noted above, traffic noise, train,
children playing and occasional aircraft operations were the predominant noise generating
sources within the project area. Generally, the Lmax values were recorded during traffic
acceleration or deceleration activities or train operations. Lmjn values were recorded
without traffic and represent the potential "quiet non traffic" profile.
Average noise levels (Leq) are commonly used composite noise descriptors of the
continuous A-weighted sound levels. The results(Leq) are presented in Table 1 for the six
monitoring locations.
TABLE 1
NOISE SURVEY DATA Leq (dBA)
Monitoring Location
1
2
3
3A
4
5
Session
#1
62.9
60.4
63.2
62.4
62.3
72.6
Session
#2
65.4
59.8
58.7
60.2
61.9
69.8
Session
#3
60.2
57.1
55.1
52.8
56.3
72.1
Session
#4
59.1
50.0
52.0
51.5
53.5
72.9
Session
#5
56.1
55.2
58.0
58.3
59.2
71.2
Session
#6
68.5
60.5
62.1
63.3
61.7
70.1
The noise survey data forms are provided in Appendix A. Each noise survey form
summarizes the date, time of measurements, Lmax, Lmin, Leq, and noise characteristics
(e.g. train horn, aircraft operations, traffic, children playing). Sessions #1, #2, and #6
were completed during typical construction- daylight hours. Sessions #3, #4 and #5 were
completed during non-construction- evening hours.
As summarized in Table 1, average daylight noise measurements were in the mid to lower
60 dbA range with the evening and nighttime measurements in the 50 to 59dbA range.
Site 5, immediately adjacent to the railroad crossing, measured in the 69-73 dbA range
throughout the day.
CMWD Project No. 91-403
May 1999
APPENDIX A
NOISE MONITORING SUMMARY FORMS
NOISE MONITORING SUMMARY
SITE #1
Jefferson Street /Knowles Avenue
Noise Level/
Characteristics
Average (Leq)
Maximum (Lmax)
Minimum (Lmin)
Date
Start Time
Stop Time
Traffic
Children Playing
Train Horn
Aircraft
Wildlife
Residential Noise (music)
#1
62.9
79.3
44.4
4/29/99
1110
1140
X
X
X
#2
65.4
78.9
48.2
4/29/99
1452
1512
X
X
X
X
#3
60.2
75.9
48.2
4/29/99
2045
2115
X
X
X
X
X
#4
59.1
69.2
46.3
4/30/99
0021
0051
X
X
#5
56.1
68.4
48.9
4/30/99
0440
0510
X
#6
68.5
86.8
50.1
4/30/99
0810
0840
X
X
X
X
X
NOISE MONITORING SUMMARY
SITE #2
Jefferson Street /Arbuckle Place
Noise Level/
Characteristics
Average (Leq)
Maximum (Lmax)
Minimum (Lmin)
Date
Start Time
Stop Time
Traffic
Children Playing
Train Horn
Aircraft
Wildlife
Residential Noise (music)
#1
60.4
80.1
46.3
4/29/99
1110
1140
X
X
#2
59.8
74.1
47.8
4/29/99
1525
1555
X
X
X
#3
57.1
74.4
41.8
4/29/99
2045
2115
X
#4
50.0
67.7
41.4
4/30/99
0055
0125
X
#5
55.2
68.4
47.8
4/30/99
0513
0543
X
X
#6
60.5
79.3
44.4
4/30/99
0845
0915
X
X
X
NOISE MONITORING SUMMARY
SITE #3
Jefferson Street /Oak Avenue
Noise Level/
Characteristics
Average (Leq)
Maximum (Lmax)
Minimum (Lmin)
Date
Start Time
Stop Time
Traffic
Children Playing
Train Horn
Aircraft
Wildlife
Residential Noise (music)
#1
63.2
83.0
45.9
4/29/99
1224
1254
X
X
X
X
X
#2
58.7
73.3
45.6
4/29/99
1600
1630
X
X
X
X
#3
55.1
73.4
45.2
4/29/99
2157
2227
X
#4
52.0
65.8
45.2
4/30/99
0140
0210
X
X
#5
58.0
71.1
53.1
4/30/99
0547
0617
X
X
#6
62.1
79.3
45.6
4/30/99
0922
0952
X
X
X
NOISE MONITORING SUMMARY
SITE #3A
Oak Avenue/Madison Street
(Contractor Staging Area)
Noise Level/
Characteristics
Average (Leq)
Maximum (Lmax)
Minimum (Lmin)
Date
Start Time
Stop Time
Traffic
Children Playing
Train Horn
Aircraft
Wildlife
Residential Noise (music)
#1
62.4
85.7
47.1
4/29/99
1301
1331
X
X
X
#2
60.2
78.9
48.6
4/29/99
1635
1705
X
X
X
X
X
#3
52.8
68.8
47.1
4/29/9
2230
2300
X
X
X
#4
51.5
59.4
45.9
4/30/99
0213
0243
X
#5
58.3
74.1
50.4
4/30/99
0620
0650
X
X
X
X
X
#6
63.3
82.7
46.7
4/30/99
0958
1028
X
X
X
NOISE MONITORING SUMMARY
SITE #4
Madison Street/Chestnut Avenue
Noise Level/
Characteristics
Average (Leq)
Maximum (Lmax)
Minimum (Lmin)
Date
Start Time
Stop Time
Traffic
Children Playing
Train Horn
Aircraft
Wildlife
Residential Noise (music)
#1
62.3
84.9
47.4
4/29/99
1413
1443
X
X
#2
61.9
78.2
46.7
4/29/99
1710
1740
X
X
X
X
#3
56.3
66.6
50.4
4/29/99
2306
2336
X
X
#4
53.5
63.2
45.2
4/30/99
0247
0317
X
#5
59.2
75.2
50.3
4/30/99
0652
0722
X
X
X
X
X
X
#6
61.7
81.9
45.2
4/30/99
1033
1103
X
X
X
X
NOISE MONITORING SUMMARY
SITE #5
Tamarack Avenue/ Railroad Crossing
Noise Level/
Characteristics
Average (Leq)
Maximum (Lmax)
Minimum (Lmin)
Date
Start Time
Stop Time
Traffic
Children Playing
Train Horn
Aircraft
Wildlife
Residential Noise (music)
#1
72.6
100.3
45.9
4/29/99
1413
1443
X
X
X
#2
69.1.8
100.8
48.2
4/29/99
1750
1820
X
X
#3
72.1
101.1
41.8
4/29/99
2341
0011
X
X
#4
72.9
101.4
41.1
4/30/99
0327
0357
X
#5
71.2
100.8
45.6
4/30/99
0730
0800
X
X
X
#6
70.1
101.0
46.2
4/30/99
1110
1140
X
X
APPENDIX B
PHOTOGRAPHS OF
NOISE MONITORING LOCATIONS
NOISE MONITORING LOCATION #1
JEFFERSON STREET/ KNOWLES AVENUE
NOISE MONITORING LOCATION #2
JEFFERSON STREET/ ARBUCKLE PLACE
NOISE MONITORING LOCATION #3
JEFFERSON STREET/ OAK AVENUE
:—-—
iF _^^^^^^m-^^^— -^^^^
NOISE MONITORING LOCATION #3A
OAK AVENUE/ MADISON STREET
NOISE MONITORING LOCATION #4
CHESTNUT AVENUE/ MADISON STREET
^
NOISE MONITORING LOCATION #5
TAMARACK AVENUE/ RAILROAD CROSSING
APPENDIX C
SITE MAPS OF
NOISE MONITORING LOCATIONS
VISrA/CARLSBAO INTERCEPTOR SE'AER
REPLACEMENT PROJECT REACH VCSA
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ELEMENTARY
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APPENDIX D
NOISE METER CERTIFICATIONS
"I Response Rentals
Sales • Service • Repairs
800-242-3910 • 716-424-2140
Response Rentals
Certificate of Compliance and Calibration
Model No.: Quest 2800 Customer: Response Rentals
Serial No: HS5020012 ID No: 1457 Purchase Order: Internal
Date of Calibration: 3/24/99 Date Due: 3/24/00
Accuracy: ANSI Type 2 Temperature: 69.8 F Humidity: 28.3%
Condition of Instrument Received
Condition Received: In Tolerance
Remarks:
Condition of Instrument Returned
Condition Returned: In Tolerance
Remarks: Device meets ANSI Type 2 specifications under laboratory
conditions for sound level meters.
Standards Used
Standards: Due Date:
Quest QC-20 Sound Calibrator ANSI S1.40 S/NQF802001 03/12/00
Quest 1700 Imp Sound Le\vl Meier ANSI S1.40 S/N HT7090016 03/12/00
Quest -Cal Acoustic Calibrator S/N KZ706000 1 06/02/99
BrucI & Kjacr 4938 Microphone S/N 2064026 03/12/00
Response Rentals does hereby certify that the above listed sound level meter meets or
exceeds the manufacturer's specifications and has been calibrated using standards and
instrument] whose accuracies are traceable to the National Institute of Standards and
Technology (NIST). This report cannot be reproduced without prior approval from
Response Rentals.
Approved^' > _— Date:
Response-Rentals, 1057 East Henrietta Rd., Rochester, NY 14623
-' "" Tel: 800-242-3910 Fax: 716-424-2166
y Response Rentals
Sales • Service • Repairs
800-242-3910 • 716-424-2140
Response Rentals
Certificate of Compliance and Calibration
Model No.: QuestQC-lO Customer: Response Rentals
Serial No.: QE5030081 ID No: N/A Purchase Order: Internal
Date of Calibration: 3/24/99 Date Due: 3/24/00
Accuracy: +/- 0.3 dB Temperature: 69.8 F Humidity: 28.3 %
Condition of Instrument Received
Condition Received: In Tolerance
Remarks:
Condition of Instrument Returned
Condition Returned: In Tolerance
Remarks: Device meets ANSI standard Sl.40-1984 and 1EC 942-1988 for sound
calibrators under laboratory conditions.
Standards Used
Standards: Due Date:
Quest QC-20 Sound Calibrator ANSI SI.40-19X4 S/NQFS02001 03/12/00
Quest 1700 Impulse Sound Level Meter ANSI Sl.40-1983 Type 1 S/N HT70900I6 03/12700
Quest -Cal Acoustic Calibrator S/N KZ7060001 06/02/99
Fluke 29 Digital Multimeter S/N 64090310 09/24/99
EdgeTech 2002 Temperature Probe S/N 105 03/11/00
EdgcTcch 2002 Dew Point Hygrometer S/N 2B637 03/11/00
Response Rentals does herby certify that the above listed Sound calibrator meets or exceeds
the manufacturer's specifications and has been calibrated using standards and instruments
whose accuracies are traceable to the National Institute of Standards and Technology
(NIST). This report cannot be reproduced without prior approval from Response Rentals.
Approved by: (^. (V^- Date: 3/24/f^
Response Rentals, 1057 East Henrietta Rd., Rochester, NY 14623
Tel: 800-242-3910 Fax: 716-424-2166