HomeMy WebLinkAboutCT 96-03; Pacific View Estates; Tentative Map (CT) (7)GEORGE E. LEIGHTON
CONSULTANT, NOISE CONTROL
ACOUSTICAL ANALYSIS REPORT #708
for
PACIFIC VIEW ESTATES - CARLSBAD
TRACT MAP CT-95-7, PARCEL # 167-258-16
Prepared for
DON L. JACK, MANAGING MEMBER
PACIFIC VIEW LTD.
Prepared by
rge E. Leighton
Certified Acoustical Consultant
11-27-95
1307-A SOUTH EUCLID STREET • ANAHEIM, CA 92802 • (714) 535-8648 FAX (714) 535-8649 (800) 570-3666
CONTENTS
Page
Forward
Site Map
Summary
CNEL Calculations
Conclusions
Appendix
1. George Leighton, Consulting Services
2. City of Carlsbad Noise Guidelines
3. Computer Calculations
4. Brochure - National Council of Acoustical Consultants
FORWARD
This report was prepared for Don L. Jack, managing member of Pacific View Ltd.
Its purpose is to demonstrate that the Pacific View Estates residential development will meet
all requirements of the City of Carlsbad Noise Guidelines Manual. Excerpts are given in
Appendix 2, and are summarized below:
Exterior Standard 60 dB(A) CNEL
Interior Standard 45 dB(A) CNEL
As will be shown, the exterior standard will be met with a 6' noise barrier wall on the rear
property line along Carlsbad Village Drive for lots 7, 8, 9 (unit 1). The interior standard
will be met with STC 32 2nd floor windows facing Carlsbad Village Drive on lots 7 and 8
in Unit 1 and lot 8 in Unit 3.
'SITE
OtJVCNH«« MO
VICINITY MAP
NO SCALE
•SffE MAP
2.
SUMMARY
The tentative map of the Pacific View Estates dated 10-18-95 was used to calculate CNEL's.
Two aspects were examined:
1. Exterior Noise Environment
a. Aircraft Noise
There is no aircraft noise impact, except for occasional overflights.
b. Vehicle Noise
The primary potential noise is from Carlsbad Village Drive. Using the
FHWA model, computer calculations were made for CNEL. These were
used for on-site noise calculations. As noted earlier, with a 6' high noise
barrier wall along the rear property line of lots 7, 8, and 9 in Unit 1, noise
levels in the rear yards will be at or below the required 60 dB(A) CNEL.
2. Interior Noise Mitigation
Where exterior CNEL is above 60, interior noise calculations are required. As noted
earlier, this will be required for 2nd floor rear bedrooms on lots 7 and 8 in Unit 1
and lot 8 hi Unit 3. Preliminary computer calculations for a typical 12' x 12'
bedroom indicate that sound rated windows (STC-32) will be required.
Since the residences have not yet been designed, and since the purpose of this report
is to meet site approval requirements, no specific interior noise calculations are
required for this report.
CNEL CALCULATIONS
The topography in this area is most unusual and departs from the usual homesite where the
arterial highway (Carlsbad Village Drive) is on the same elevation as the lot. The lot
elevations, as shown on the following tract map range from 4' above the highway to 24'
below. In addition, in the usual development the home faces the highway and acts as a noise
and visual barrier for the rear yard recreational area. The opposite is true here.
In addition to the requirement for a 6' high.rear noise barrier wall, the wall is also needed
for visual privacy. As a practical matter, the wall will probably be extended to all the lots,
in addition to those few requiring it for noise barrier purposes.
Lot 8 in Unit 1 is the critical lot and the only one requiring a rear noise barrier wall.
However, the wall is extended to the adjacent lots 7 and 9 to protect from noise flanking
around the wall. In lot 9 which is above the highway, the rear of the lot acts as a berm to
block noise. For those lots below the highway, the edge of the highway also acts as a berm.
Primary traffic noise is tire noise, generated at the highway surface. A berm which breaks
the line-of-sight to this highway surface reduces traffic noise levels. This applies to the 2nd
story bedroom windows as well as the rear yard.
The following sketch shows a typical lot illustrating the location of the exterior CNEL
measurement point and the rear of the residence with respect to the centerline of the nearest
traffic lane. These dimensions are used in computer calculations of CNEL. (Appendix 3).
The city provided existing traffic count (8,817 ADT) and future projected traffic (17,000
ADT) @ 43 mph. Using these traffic counts, the following CNELs were calculated using
the FHWA computer model.
LOT#
8
8
7
7
ADT
8,817
17,000
8,817
17,000
CNEL (dBA)
REAR YARD
No Wall
(62.5)
65.4
55.1
(58)
W/6' Wall
(57.7)
60.6
2ND FLOOR
No Wall
60.8
63.7
W/6' Wall
(59.6)
62.5
NOTE: Above computer calculations indicate a 60.6 CNEL for the lot 8 rear yard with
a 6' noise barrier. This will be reduced by the 4' elevated berm effect of the adjacent lot
9 to achieve the specified 60 CNEL.
il
SCALX: 1" » 100'
,_ )>
TYPICAL LOT
NO SCALE
CONCLUSIONS
1. The critical lot in Unit 1 is #8 it requires a 6' sound wall.
NOTE: The sound wall must extend from lot 7 to 8 and 9 to shield lot #8 from
flanking noise.
2. At 8,817 ADT no interior sound mitigation is required.
3. Above 8,817 ADT sound rated windows may be required.
4. At 17,000 ADT, a typical 12' x 12' 2nd floor bedroom would be 35 CNEL with an STC
32 ABC window. Specific calculations are not within the scope of this report.
APPENDIX
' ComP"<er Calculations
I
GEORGE E. LEIGHTQN
CONSULTANT, NOISE CONTROL
CONSULTING SERVICES
Mr. Leighton is an acoustical consultant with an impressive list of clients. Some of
the more well known are listed below:
Chevron Texas Instruments
Digital Equipment Textron
General Electric 3M
Gulf Oil U. S. Navy
International Harvester United Technologies
He has over 35 years of professional engineering experience with over 25 years exclusively
in the field of industrial, commercial, and residential noise control:
Industrial
His industrial experience covers the entire range of noise abatement. He has worked
with OEM's (Original Equipment Manufacturers) to design quiet equipment and provide
field retrofit kits. He has designed, built and installed noise-control systems involving
single items of equipment through entire plants for the metalworking, automotive,
construction, printing, chemical and petrochemical industries. Techniques ranged
from initial noise surveys through computer prediction and computer modeling to
insure compliance with in-plant and community noise standards . . . OSHA compliance
experience ranges from noise surveys, corrective action to meet OSHA standards,
consulting with clients and attorneys under OSHA citations, and negotiating with
OSHA to develop abatement plants for cited clients.
Commercial
His commercial experience covers new construction and corrective action for
churches, recreation halls, existing schools, restaurants, factory and office buildings,
hospitals, hotels and motels. Code-compliance reports prepared for interior and
exterior (community) noise requirements. Mechanical systems analysis provided for
new construction and corrective action for existing systems.
Residential
His residential experience covers new and existing apartments, condominiums, and
private homes. Acoustical Analysis Reports prepared for Title 24, building and
grading permits. He specializes in analysis and correction of problems in existing
buildings. Expert-witness testimony provided in court actions.
Typical clients are industrial firms, architects, developers, contractors, homeowners,
attorneys, consulting engineers, schools, city and national governments.
1307-A SOUTH EUCLID STREET - ANAHEIM, CA 92802 • (714) 535-8648 FAX (714) 535-8649 (800) 570-3666
GEORGE E. LEIGHTON
PROFESSIONAL QUALIFICATIONS
BOARD-CERTIFIED ACOUSTICAL CONSULTANT
REGISTERED PROFESSIONAL ENGINEER (MA)
GRADUATE ENGINEER, MASTER'S DEGREE
35 YEARS' PROFESSIONAL ENGINEERING EXPERIENCE
25 YEARS EXCLUSIVELY IN NOISE CONTROL
MEMBER:
Acoustical Society of America
Institute of Noise Control Engineers
National Council of Acoustical Consultants
National Society of Professional Engineers
Society of Testifying Experts
OCT-23-95 CITY
P.01
City of Carisbad
Planning Depart merit
F AX TRANS MITTA L
DATE:
TIME SENT:
TO;
[PANY:
O -2;3- <f_5"
'HONE #:
NUMBER OF PAGES BEING TRANSMITTED;
(INCLUDING FAX TRANSMITTAL)
FROM:
DEPT: PLANNING
PHONE #: (619) 438-1161 ext.
FAX #: (619 438-0894
3ECIAL rNSTRUCTIONS:
I"7
S66T-Sc-iOO
.-0CT-23-95 MON 15:15 CITY OF CARLSBAD COMM DE FAX NO. 4380894 P. 02
CITY OF CARLSBAD , __________Noise Guideline Manual
SUMMARY
The following is a summary of the most frequently requested City noise policies. Information
contained in this summary is described in more detail in the body of the Noise Guidelines
Manual.
ResidentialI Exterior Noise Standard
it is the policy of the City that 60 decibel dB(A) CNELis tho exterior noise level to which
residential units must be mitigatecU^32S9?*''tfTO^!S55S^?s^
Interior Noise Standard
Interior noise levels for all residential units shall be mitigated to 45 dB(A) CNEL when openings
to the exterior of the residence are closed. If openings are required to be closed to meet the
interior noise standard then mechanical ventilation sha'i be provided.
• Threshold for Requiring Noise Reports on Residential Project
A noise report shall be required for all residential projects within the following noise referral
zones (refer to the Carlsbad Future 2010 Noise Contour Map Figure-; or see the 1000' scale
map1 provided at the back of this document):
a. Within the GO dB(A) CNEL contour from gny existing or future rail line shown on the
noise contour maps approved as a part of the Carlsbad General Plan.
b. Within the 60 dB(A} CNEL contour from any State or Interstate Highway or Prime
Arterial as shown on the Noise Contour Maps approved as part of the Carlsbad General
Plan.
c. Withm the 55 dB{A} CNEL noise contour of ail other existing or future Circulation
Element Roadways as shown on the Noise Contour Maps approvad as pan of the
Carlsbad General Plan.
d. Within the McCIellan-Palomar Airport 60 d8(A) CNEL Noise contour line as shown on
the 1995 Noise Contour Map of the McClellan-Palomar Airpurt Comprehensive Land
Use Plan (CLUP) see Figure-ii.
'1000' scale map will be included in final document oniy.
tfCT-23-95 tlON 15:16 CITY OF CARLSBAD COtIM DE FAX NO. 4380894
Noise Guidelines Manual
P,03
_CITY OF C.A.RLSQA.D
Findings Necessary to Exceed Residential Noise Standards
If the acoustical study shows that exterior or interior noise levels cannot be mitigated to the
established standard as noted above (60j$|$grdB(A) CNEL or less for the exterior portion of
residential projects, or'45 dB(A) CNEL or less for interior portions of residential units), the
development shall not be approved without the following findings:
a.
b.
c.
The developer of the project has proved to the satisfaction of the Planning Commission
or Design Review Board that it is not feasible to comply with the standard.
• The Planning Commission or Design Review Board must find that there are specifically
identified overriding social and economic considerations which warrant approval of the
development even though it does not meet the noise standard,
All purchasers of the impacted property shall be-notifiac in writing prior to purchase,
and by deed disclosure in writing, that the property they are purchasing is noise
impacted end does not meet Carlsbad noise standards for.residential property.
In addition, appropriate mitigation and/or conditions of approval shaft be incorporated into the
project in accordance with the Carlsbad Noise Guidelines Manua!.
Non-Residentigl Exterior Noise Guidelines
The guidelines for maximum exterior noise levels for non-residentia! uses are provided in ths
Land Use Compatibility For Community Noise Environments (Matrix (see Figure-iii). Nor.
residential noise will be primarily regulated through the project review and approval process.
Non-Residential Interior Noise Guidelines
TABLEM'
NON-RESIDENTIAL INTERIOR NOISE GUIDELINES
TYPICAL USE
Church Sanctuary, Preschool, Schools,
Fire Station Sleeping quarters, etc
General Office, General Commercial,
Heavy Commercial, etc.
Planned Industrial, General Industrial, etc.
45
55
5? 11 m m u ru T i
OCT-23-95 MOM 15:16 CITY OF CARLSBAD COMM DE FAX NO. 4380894 P. 04
CITY OF CARLSBAQ,NTpisa Guidg.LiflQ.3 Manus!
Measurement Location for Determining Noise Level
Proposed projects are to mitigate the. projected build-out noise level to a maximum as
described above at: ' ' .
a. 5-feet above finished grade level; and
b. 20-feet from the rear/side of the structure, unless the rear/side yard is less than 20-
feet deep where the measurement shall be at the property line.
where exterior space above the first floor/story of a residential structure is proposed to be
used to meet Planned Development (PD) recreational space standards as required pursuant to
Chapter 21 .45, the exterior space shall be mitigated to the City standard in order to receive
credit as recreational space.
Noise Issues not Addrgssed in the Nois6_Guide!ines Manuaj
The Noise Guidelines Manual is intended to primarily address community noise issues related
to land use. The Noise Guidelines Manual does not address noise issues such as animal noise,
noise from parties and loud gatherings, motor vehicle noise or genera! nuisance noise, if you
are interested in finding out how the City deals with these noise issues please see ihe
appropriate Carlsbad Municipal Code section (CMC §) as noted below or contact the Carlsbad
Planning Department.
TABLE - ii
SUMMARY OF NOISE ISSUES ADDRESSED IN THE CARLSBAD MUNICIPAL CODC
NOISE TYPE
Ahimai Noise
Parties/Loud Gatherings
Construction
Motor Vehicles
General Nuisance Noise
CARLSBAD MUNICIPAL
CODE SECTION
CMC § 7.04
CMC § 3.36
CMC § 8. 48 *
CMC § 8.28
Not Regulated by Ordinance
CMC § Carlsbad Municipal Coda Section
• Tha Noiee Guidelines Manual briefly addrocoos construction noice soo Pago 22 of this Manual.
3
t- i <.-.i.-=, V -,..
j 3. 12.r^
0.0 93-
Day 72.965
Eveninq 1.509
Night O.616
Average Daily Traffic:
i •( *-p* .1 ••"'.•t 1 •; *.J. ^>
0,231
("I f-|Q7
S,817
Speeds!Autoniob i 1 es: 43.0 MPH
Medium Trucks: 43.0 MPH
Heavy Trucks;; 43.0 MPH
69.2 KPH
69.2 KPH
69.2 KPH
Lanes: Number c-f Laness 4
Lans Width:
Median Widths
'"> ;•', '•_ i.
f t .,
3.66 mstsr
3.66 meter
None
T"\ 'i •"" 4^ ^ i". r- !•-• -v- v ••> <Ti V ' i— i~; T c.i- J-— i--: 4-
Lef t i... i :Ti i f.; — 9O „ 0
R i n;~-1 ! i rr& '* t a ^:-~-} n O degrees
Day
eni no
Night
CNEL.
LDN
57=9
56 . 4
5 i „ 0
59 n g
»w '"/ H *^.
,.-;{ r';= 1:1;;
*j. _••. n -/"i
/•' -"j ^
50 ,. 9
'•"" j"1; ''-»
50 .. 2 59
4 j. ., 6 b--i:-
43 . 5 52
i~; -J ^i I A r--
51,4 fcO
•;
:-f
,2
84
.-'!_
r
r-HWA Traffic Noise Predict ion Model
._ „ H /--. -"-Q — \ O'"'-" _ ___,- u .1 •..' — ji. O .J. / .* •__! ""* ----- "" --------- ' " — " " ""* ' "
USING CALIFORNIA NOISE EMISSION LEVELS
Di *st'r i fcv.'.t i on?i; Or an re1 Count v Artf^ri .-^3 ••-•, — l';'?S5
1 ;;•.; -i i i , T,
Automobilss
Day 72.965
Evsnino 1.509
Kii n)--. •,-• t"'. A •; A1 •• - i' > •••• •••• • >-' •- '•-'
Lanes:
Site:
Eiarri er i
!'•-[; i A" J"i f^ v •--•(• ! :-ti"'i,",-^z *1 -] L.I 111 ^^ *.™ i •«* i i.^. u,'. i i -._. ni- u
Lane Widths
Median Width:
None
Distance from Center of
Nsar Lane t.c Receiver:
31 s: L e f t L i fn i t J
R i ci h t Li :Ti i t s
.0 ft.
. O -f r .
--J . 5 "7 radians
i „ 57' r adi ans
[ JRI MR CAL I FORM IA NH1 S':;:" F!v! ISSI ON L FVEI S
O i •". i" ••*" j_ £~* \ > T T_ o* "i "*"•» Ov" -5 -"i o tr* i"""-Oi '-.r"! r "i"/ A ^' li *"•!""* ** ™' ^ ""• — ' "^"o-^j
Average
Speed ss
^k. 1^^^ i -.1 r". i^j c: n^^K ' •»*•——'»
•^
S i t e s
Bar r i sr
Daily Traf
Aut
Mediaii,.™nfc'civ
Nambsr
La
Medi
Hard
s Wai 1
Height of
Heiaht of
Heicht of
-i- 'J_ i— »
O iTi O i5 3 1 e '"/
m Trucks
y Trucks
a-f Lanes
ne Width
an Width
Receiver
Barrier
Pavement
i 7 , 000
43. 0 HPH
43.0 HPH
43.0 MPH
4
1 2 , 0 -f t „
12.0 -ft.
15,. 0 -ft.
: 6.0 -ft.
0 . 0 -f t .
69
6?
69
3 .
•i .
^!
!i. 9
0 .
-".-'
. 2'-t
0 -£.
66
66
~~<"7
S'"-'
00
KPH
KPH
KPH
meter
meter
meter-
meter
IT, at er
5
<r
S
S
S
CiMEL
LDN
FHWA Tr £rf T i c Hoi SB Pvpri i c"t. i on Mod si
.L. „, ,. •) |'"^ „... '"~\ i™-' „_ -i CV';'-°C' "*•" .__..— —. -_ ..... --_ -_ — .......... .... „.. .... ..— —. .._ „._.„,..-_.._ „„ .__ .__..„ .__ ,.-~ — .. —. -.— —. .» .— ..«,
US1MG CAL1FORM1A MD1 BE EMI S31ON LEVELS
; I • 3 \E t i"" ?i. -7;' v'!" 1 O i™!':-:- e fl i"" cr1 f")!'" 6? C'- f j L i f"! T "V A *~ 1" !iZ' i'" i ^ 1 —• '"" 1 ''"? i"3 S '•iFM':<
Site:
Lsne Uiidth
Median Width
Hard
Barrier: Wall
Height of Receivers
!~lt51 TJ i~*i 1~ O'f* 3H-™1 i1" r" i s^1 v a
Height o-f Pavement:
Distance from Center o-f
KJ£<£i(•- L^eipje to HiHi'""r i er n
5.0 -ft.
6.0 -ft.
ri A .c -h
'? O „ O -f t
Richt Limit: 90,. 0 dears
Trucks
53. 4
-r r'; "! I.J 1
fa //
F H W A T r a -f f i c Noise P r e d i c t i o n Mods 1
stribution County Arts-rials - 1985
Trucks
Sits;
Nufi;ber oH7 Lanes; 4
Lane Widths 12.0 -ft.
Median Width; 12.0 -ft.
Barrier; Berm ' ••
H t? i g h t D f R e c e i v e r s --1, 0 -f t..
H e i g h t CD f B s, r r i e r ; 3. 0 f t.
Height of Pavements 0.0 ft.
Distance fro=n Center of
Near Lane to Barrier: 20.0 -ft.
-0. 30 meters
0.91 meters
0.00 meters
>- r-. ;y,
AngIes L ert Li :Tii t " —'"'O. 0 OSOr
R i ci h t L- "1 in i 1" ; '"? 0. 0 d e Q r
47
•
75. 72. 63, 59,, 56. 55,. 51. 45. DBA= 63
ROGH CONSTANTS CSQ.FT) (VOLUME = 1200.)
i !•:' •'?>:"
6.
4K