HomeMy WebLinkAbout1995-03-28; City Council; 13077; ADVERTISE FOR BIDS FOR IMPROVEMENTS TO THE SOUTH SIDE OF ALGA ROAD BETWEEN MIMOSA DRIVE AND EL CAMINO REAL PROJECT NO. 3428c
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/i I Cl@ OF CARLSBAD - AGEW BILL
AB# 15~77 TITLE: ADVERTISE FOR BIDS FOR DEPT.
MTG, 3/28/95 IMPROVEMENTS TO THE SOUTH SIDE OF ALGA ROAD CITY A
CITY M DEPT. ENG
RECOMMENDED ACTION:
BETWEEN MIMOSA DRIVE AND EL CAMINO REAL
PROJECT NO. 3428
Adopt Resolution No. %G 7s approving plans and specifications and authorizin
City Clerk to advertise for bids for the construction of the improvements to the soutk
of Alga Road between Mimosa Drive and El Camino Real, Project No. 3428.
ITEM EXPLANATION: ,
Alga Road between Mimosa Drive and El Camino Real is classified as a secondary a street in the Circulation Element of the General Plan. Currently, the road consists c westbound lanes and one eastbound lane. Increase in future traffic volumes from adj
developments and background traffic are projected to fail performance standards I
the Growth Management Program if the second eastbound through lane is not constn
In order to ensure that Growth Management standards will be maintained, it is nece
to widen the south side of the road to provide two eastbound lanes including a bike
To be prepared for this eventuality, staff recommended, and City Council agrec
allocate $300,000 for the design and construction of this street widening project i
1993-1 994 Capital Improvement Program. The allocation was made from the Traffic Ir
Fees fund.
Engineering staff has completed the plans and specificationsfor the widening of Alga
from Mimosa Drive to El Camino Real. The construction of this project is scheduled completed in the Summer of 1995. Subsequent to the City Council's earlier appro this project on May 10,1994, the Engineering Department received expressions of co
that the project would increase noise levels for the adjacent residential project, SE
Condominiums. Mestre Greve Associates was retained by the City of Carlsbad to pc
a noise study. The noise study test result (marked Exhibit 3) indicates that, althous noise levels generated by traffic in the number 2 lane will increase by a small amour
to moving of the road 4.5 feet closer to the residences, the overall noise level
decrease by 0.10 dBA due to relocation of the center lane away from the resids
The center lane (lane adjacent to median) is expected to carry the brunt of the eastt
traffic. Additionally, the Carlsbad Municipal Water District requested that the Engint
Department incorporate the relocation and upgrading of water facilities that H impacted by the widening project. Since the project has been altered in its scopt
necessary to have the City Council approve the revised plans and specification: authorize the City Clerk to advertise for bids.
ENVIRONMENTAL REVIEW
The Planning Director issued a Notice of Prior Environmental Compliance for this p
on August 29, 1991.
CALI FORNlA COASTAL COMMISSION
The Coastal Commission issued an Exemption Letter for this project on March 8,
The project was identified as a permitted off-site improvement in the Commission':
approval of a Coastal Development Permit.
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Page 2 of Agenda Bill No. 19 077
GENERAL PLAN CONSISTENCY
The Planning Commission Determination for General Plan Consistency was approvc
September 18, 1991 as part of the Capital Improvement Program.
FISCAL IMPACE
Estimated project costs are as follows:
Design & Design Administration $22,200 Estimated Construction Cost of Street Improvements 175,800
Estimated Construction Cost of Water Improvements 14,900
Construction Contingencies for Street Improvements (1 5%) 26,400
2,200
I nspection/Administration (1 5%) 33,000
TOTAL PROJECT COST ESTIMATED $274,500
The City Council appropriated $3OO,OOO in the 1993-94 Capital Improvement Prograi
the design and construction of the project, funded from Traffic Impact Fees.
Construction Contingencies for Water Improvements (1 5%)
EXHIBITS:
1. Location map.
2. Resolution No. 9G7%pproving plans and specifications and authorizing the
Clerk to advertise for bids for the construction of improvements to the south
of Alga Road between Mimosa Drive and El Camino Real, Project No. 3428.
3. Noise analysis report.
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RESOLUTION NO. 95-75
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF CARLSBAE
CAUFORNIA, APPROVING PLANS AND SPECIFICATIONS AND AUTHORIZIN(
THE CITY CLERK TO ADVERTISE FOR BIDS FOR THE CONSTRUCTION 0 IMPROVEMENTS TO THE SOUTH SIDE OF ALGA ROAD BETWEEN MlMUS
DRIVE AND EL CAMINO REAL PROJECT NO. 3428.
WHEREAS, the City Council of the City of Carlsbad has determined it ne
desirable, and in the public interest to construct improvements to the south side of AI
between Mimosa Drive and El Camino Real; and
WHEREAS, plans, specifications, and contract documents for the furnishing for
materiials, tools, equipment, transportation, and other expenses necessary or incidenta
project have been prepared and are on file in the Engineering Department of tht
Carlsbad; and
WHEREAS, the City Council of the Crty of Carlsbad had previously appropriated '
said project; and
WHEREAS, construction for said improvements is a matter of public necessity an
NOW, THEREFORE, BE IT RESOLVED by the Crty Council of the City of C
California, as follows:
1.
2.
That the above recitations are true and correct.
That the plans, specifications, and contract documents as presented arc I !
approved.
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3. That the City Clerk of the City of Carlsbad is hereby authorized and dire
proceed to publish, in accordance with law, Notice to Contractors inviting bids
construction of improvements to the south side of Alga Road between Mimosa Dr
El Camino Real, Project No. 3428, in accordance with the plans, specifications, and t
documents hereinabove referred.
PASSED, APPROVED AND ADOPTED at a regular meeting of the Carlsbad Clty
held on the 28th day of MARCH J 1995 by the following vote, to wit:
AYES: Council Members Lewis, Nygaard, Finnila, Hall
NOES: None
ABSENT: Council Member Kulchin
ATTEST:
HA TE NZ, City Clerk (SEAL) EN ?%N*Assistant City Clerk
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EXHIBIT 3
NOISE ANALYSIS FOR THE ALGA ROAD LANE ADDITIONS
CITY OF CARLSBAD
Report #95-20 January 3 1 , 1995
Prepared For:
The City of Carlsbad 2075 Las Palmas Drive
Carlsbad, CA 92009- 1576
RECErnI
FEZ 0 2 3995
Ef'dGlNEERlNG
DEPARTMENT Prepared By:
Fred Greve, PE. Mestre Greve Associates 280 Newport Center Drive, Suite 230 Newport Beach, CA 92660' Phone (714) 760-0891
Mestre Greve As5
Report
0
NOISE ANALYSIS FOR THE ALGAROAD LANE ADDITION!
CITY OF CARLSBAD
1.0 INTRODUCTION
The purpose of this report is to determine the effect on noise leveIs of the addition of twc
lanes on Alga Road. Specifically the residential area on the south side of Alga Road between h
Drive and Manzanita Street was considered. Noise levels for four cases are determined. The cas
(1) existing traffic with existingroadway, (2) future traffic with existing roadway, (3) existing
with additional lanes, and (4) future traffic with additional lanes.
2.0 BACKGROUND ON NOISE SCALES
Sound is technically described in terms of the loudness (amplitude) of the sound and freq
(pitch) of the sound. The standard unit of measurement of the loudness of sound is the Decibel
Decibels are based on the logarithmic scale. Decibel numbers are basically the ratios of tw
quantities such as sound pressures but are expressed in sound pressure levels at a logarithmic sc
times thereof. In terms of human response to noise, a sound 10 dB higher than another is jud;
be twice as loud; and 20 dB higher four times as loud; and so forth. Everyday sounds normally
from 30 dB (very quiet) to 100 dB (very loud).
Since the human ear is not equally sensitive to sound at all frequencies, a special fi-equ
dependent rating scale has been devised to relate noise to human sensitivity. The A-weighted dc
scale (dBA) performs this compensation by discriminating against frequencies in a m
approximating the sensitivity of the human ear. Community noise levels are measured in terms (
"A-weighted decibel," abbreviated dBA. Exhibit 1 provides examples of various noises and
typical A-weighted noise level.
The Community Noise Equivalent Level, or CNEL, is the predominantrating scale now ii
in California for land use compatibility assessment. The CNEL scale represents a time weighte
hour average noise level based on the A-weighted decibel. Time weighted refers to the fact that I
that occurs during certain sensitive time periods is penalized for occurring at these times. The eve .
(A-Scak Wrighrcd Sound Lev&)
OVER-ALL LEVEL LOUDNESS
Human Judgem of Different Sou HOME OR INDUSTRY dB(r\) Sound PrCSSUre he1 COIMMUNITY
Levels Approx. O.OOO2 (Outdoor)
130 UNCOMFORTABLY From Aircraft Carrier @ 50 FL (1 30)
120
110
Microbar
OxYgCn Torcfi (121) 120 dB(A) 32 Tics as MiL Jct Ahaft Take-Off W/ Aftn-bm
Turbo-Fan Akdt @ Take Off POW= RivelingMachinc(110)
@ uxl Ft. (90)
Jct Flyover@ 1000 FL (103)
Rock-N-Roll B~~KI (108-114) 'lo dB(A) l6 rmcs as LOUD
100 dB(A) 8 'limes as Bodng 707. DC-8 @ 6080 Ft. 100 Before Landing (106) VE3Y
LOUD
Bell J-2A Helicopter@ 100 Ft. (100)
Power Mowa (%) Boeing 737. DC-9 @ 6080 Ft. Beforthdine (9n Motorcycle @25 FL (90)
Car Wash @ 20 FL (89)
Newspaper ks (97) sa &(A) 4 ria as 90
FoodBlcnder (88)
Milling Machine (85) Garbage Disposal (80)
Living Rcmm Music (76)
TV-Audio. Vacuum CIeanez
Cash Re Ism @ 10 Ft. (65-70)
Dishwasher (Rinse) @ 10 FL (60) Convmanon (60)
80 Dicsci Tm4 40 MPH @ 50 Ft. (84)
Prop. Axpiam Ryova @ loo0 Ft. (88)
Di4 Train. 45 MPH @ 100 FL (83)
High Urban Amhat Sound (80) Passcngcr Car, 65 MPH @ 25 Ft. (77) Freeway @ 50 FL From Pavemat Edge, 1O:OO AM (76 +or- 6)
Air Con~tio~g Umt @ 100 Ft. (60)
80 dB(A) 2 limes as
70 d~(x) ~CERA~y
LOUD 70
flat jP~m @ IO Ft. (SJ) 60 dB(A) 1~ as L 60
50 QW Large Transformers @ 100 Ft. (50) 50 &(A) 1/4 as L
40 Bird CalIs (44) 40 dB(A) 1/8 a L Lower Linnt Urban Ambim Sound (40)
JUST AUDIBLE (&[A] Scale Intcrmplcd)
THRESHOLD
OF HEARING 10
i
SOURCE: Reproductd from Melville C. Branch and R. Dale Beland. Qutdoor Ymsc in the Met-
MESTRE GREVE ASSOCIATES
Ex
Examples of Typical Sound
Mestre Greve As: Report
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time period (7 p.m. to 10 p.m.) penalizes noises by 5 dBA, while nighttime (10 p.m. to :
noises are penalized by 10 dBA. These time periods and penalties were selected to reflect p
increased sensitivity to noise during these time periods. A CNEL noise level may be report
“CNEL of 60 dBA,” “60 dBA CNEL,” or simply “60 CNEL.” Typical noise levels in term!
CNEL scale for different types of communities are presented in Exhibit 2.
3.0 CITY CRITERIA
The criteria used to assess the acceptability of community noise levels varies w‘
municipality. The majority of communities use 65 CNEL as the noise standard for private o
living areas (Le., rear yards and private patio areas) for new residential developments. The (
Carlsbad uses a more stringent standard of 60 CNEL as the critical criterion for assessi
compatibility of residential land uses with noise sources. This standard is applied tl
developments with the onus of mitigation placed on the developer. In considering roadway proj.
existing developments it is not a required standard, but rather an appropriate guideline in deten
potential impacts. It should be emphasized that the exterior standard is applied only to yard are:
not common areas or areas outside the second floor of a building.
In addition, for multi-family residential projects, the California Noise Insulation Stl
(California Administrative Code, Title 25, Chapter 1, Subchapter 1, Article 4) requires that the
noise levels in multi-family residential development do not exceed a CNEL of 45 dB. Aga
standard is only applicable to new residential developments. The City of Carlsbad indoor
standards are consistent with the state standards. The City of Carlsbad requires that both single
and multi-family developments achieve an indoor noise standard of 45 CNEL. Homes ach
minimum outdoor to indoor noise reduction of 20 dBA. Therefore, if the outside noise level
CNEL then the inside noise level will be 45 CNEL or less. More typically, standard consm
results in an outdoor to indoor noise reduction of 25 dBA. These values for outdoor to indoor
reduction are determined with windows in the closed position, and this is consistent with the Sta
City requirements.
4.0 TRAFFIC NOISE MODEL
The traffic noise levels projected in this report were computed using the Highway Noise h
published by the Federal Highway Administration (“FHWA Highway Traffic Noise Re&
Model”, FHWA-RD-77-108, December 1978). The FHWA Model uses traffic volume, vehicle
MESTRE GREVE ASSOCIATES
Exhibii
Typical Outdoor Noise Le
IF
Mestre Greve As:
Report
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vehicle speed, and roadway geometry to compute the “equivalent noise level”. A computer cc
been written which computes equivalent noise levels for the three time periods used in
Weighting the nighttime and evening noise levels, and summing them with the daytime level re
the CNEL for the traffic projections used.
Mitigation through the design and construction of a noise barrier (wall, berm, or comb
wallberm) is the most common way of alleviatingtraffic noise impacts. The effect of a noise b2
criticdly dependent upon the geometry between the noise source, the barrier, and the observer. 1
barrier effect occurs when the “line of sight” between the noise source and the observer is inte
by the barrier. As the distance that the noise must travel around the noise bamer increases, the ;
of noise reduction increases. The FHWA model was also used here in computerizedfoi
determine the effect of existing barriers and topographic effects.
The EHWA noise model generally provides a sufficiently accurate forecast of noise le!
order to further ensure reliable noise modeling results, the noise model was calibratedprior
projection of noise levels. A noise monitoring survey was performed in the area on January 16,
Three sites were monitored (Exhibit 3). Two of the sites were located in the middle of the sic
along Alga Road, and the third site was locatedjust outside of the yard areaindicated as Site
measurements were made with a Bruel and Kjaer Model 223 1 which was calibrated before an
the measurement series. Each site was monitored for 30 minutes in the afternoon, and th
measurements were repeated in the evening.
* The purpose of the measurements were to obtain the necessary data to calibrate the 1
Noise Model. This calibration process is not dependent on the amount of traffic occumng dun
measurement period. During the measurement period the automobiles, medium trucks, and
trucks were counted. This data, along with the posted speed limit, and the appropriate geo
relationships were inputted into the FHWA Model. The computed result was then compared
actual field measurement, and any adjustment to the model determined. In fact, it was determint
1.6 dBA should be subtracted from the computer projections for Site, 1 .O &A subtracted frc
computer projections for Site 2, and 2.1 dBA subtracted from the computer projections for Site 3
5.0 NOISE MODEL DATA
The average daily traffic volumes (ADT’s) for Alga Road were obtained from the C
Carlsbad Traffic Division. The traffic volumes and vehicle speeds used in the noise calculatio
presented below in Table 1. The vehicle speeds reflect the current posted speed on the roac
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Mestre Greve As Repon
6.0 RESULTS
CNEL noise projections were made for the same three sites that were monitored. Thf
were located on the sidewalk just inside the road right of way. Additionally, noise projectio
made for the yard area and second floor noise exposure directly behind the sidewalk site. The
of the analysis are presented in Table 3.
TABLE 3
CNEL NOISE LEVELS
Existing Road with Add. Lanes with Existing Road with Add. Lanes v,
Existing Traffic Existing Traffic Future Traffic Future Traff
Site 1 On Sidewalk 65.7 65.7 69.3 69.3
1st Floor Yard 56.4 56.4 60.1 60.0
2nd Floor Exterior 61.1 61.1 64.7 64.7
Site 2 On Sidewalk 66.3 66.3 69.9 69.9
1st Floor Yard 54.9 54.8 58.5 58.4
2nd Floor Exterior 61.7 61.7 65.3 65.3
Site 3 1st Floor Yard 49.4 49.4 53.1 53.0
2nd Floor Exterior 53.2 53.2 56.8 56.8
The results indicate that the additional lanes will not increase the noise levels at the re5
along Alga Road. In fact, the analysis indicates that the noise levels will actually decrease tk
levels by 0.1 dBA, a amount that is not discernible, for two of the situations assessed. In lo(
the 2 and 4 lane configurations, it should be noted that the near lane currently is centered abc
feet from the right of way line. (The right of way line remains unchanged.) For the fa
configuration, the center of the eastbound lanes will be 25 and 37 feet from the right of way
other words, some of the eastbound traffic will be located about 4.5 feet closer to the residenc
the remaining eastbound traffic will be 7.5 feet further away. This results in a balancing effeci
there is no overall change.
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Mestre Greve Assc Report 4
LookiGg at the exterior yard areas, the future traffic volumes will result in noise levels
CNEL with or without the project. This is right at the City standard for new developments, ani
not warrant mitigation. Second floor exterior noise range up to 65 CNEL. As discussed pre\
this will result in interior noise levels in the 40 to 45 CNEL range. Again no mitigation is indica1
interior noise levels.
Finally, it should be noted that the City has committedto repeating the noise measure
after the additional lanes are installed. Increases in noise levels would be a “warning flag,” and
require further analysis and reconsideration of appropriate mitigation measures.
Mestre Greve As: Report
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CNEL PREDICTION WORKSHEET - CALVENO
site 2
l/4 for lane
Thts is the CNEL at 15 m.
Soft Hard
ChEL(15m) CNEL(15m)
Auto 60.8 62.0
Medium Trk. 52.3 53.5
Heavy Truck 44.2 45.4
Total 61.4 62.6
MacZoom
The data you need to enter is in itallics.
Auto
MT
HT
Day Eve Night Equiv.
74.48% 15.11% 8.54% 207.6%
1.35% 0.27% 0.15% 3.8%
0.07% 0.01% 0.01% 0.2%
To get other noise levels, To get other distances,
Put in other distances (ft).
Dist. Soft Hard
100 I 56.8 1 59.6
Put in other noise levels.
CNEL Soft Hard
57 1 97 1 180
Road Distance Base Of Dist. To Pad Observer Wall
Lot Elevation’ To Wall Wall Observer Elevation Height Height
2 - Near 151.6 25 151.6 20 151.6 5 3.3
151.6 37 151.6 32 151.6 5 3.3
2- Far 151.6 67.5 151.6 62.5 151.6 5 3.3
151.6 79.5 151.6 74.5 151.6 5 3.3
2 - Near - Yard 151.6 25 151.6 50 147 5 3.3
151.6 37 151.6 62 147 5 3.3
2- Far 151.6 67.5 151.6 92.5 147 5 3.3
151.6 79.5 151.6 104.5 147 5 3.3
2 - Near - 2nd Floor 151.6 25 151.6 50 147 14 3.3
151.6 37 151.6 62 147 14 3.3
2- Far 151.6 67.5 151.6 92.5 147 14 3.3
151.6 79.5 751.6 104.5 147 14 3.3
***Barrier Reduction*** +++CNEL+++
Auto MT HT Soft
0.0 0.0 0.0
0.0 0.0 0.0
0.0 0.0 0.0
0.0 0.0 0.0
67.3
64.3
59.9
58.8
69.9
54.4
53.3
50.6
49.0
7.7 6.3 0.0
7.4 6.3 0.0
7.0 6.3 4.9
6.9 6.3 5.1
58.4
0.0 0.0 0.0 61.4
0.0 0.0 0.0 60.0
0.0 0.0 0.0 57.4
0.0 0.0 0.0 56.6
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