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HomeMy WebLinkAbout; Emerald Heights-West - Noise Assessment; Emerald Heights-West - Noise Assessment; 1995-05-24Pacific Noise Control May 24, 1995 Mr. Marcus Palkowitsh MSP California LLC 650 Cherry Street, Suite 435 Denver, Colorado 80222 PROJECT: Emerald Heights-West Project RE: Noise Assessment Dear Mr. Palkowitsh: This report contains our assessment of the noise environment at the proposed Emerald Heights- West project located in the City of Carlsbad. In summary, the future noise level at the proposed lots would meet the City's exterior noise criteria. Therefore, exterior noise mitigation measures are not required. To comply with City's interior noise standards, an interior noise study will be required for Lots 14-35 prior to issuance of building permits. 1.0 BACKGROUND Project Setting The Emerald Heights-West project site is located approximately 850 feet south of Palomar Airport Road and approximately 1,500 feet west of College Boulevard. The project would develop the site with 61 single family homes. The City of Carlsbad has requested that a noise study be prepared evaluating the exterior noise impacts at the site. The analysis is based on the tentative map dated 5/18/95. The primary noise sources at the site are vehicular traffic along Palomar Airport Road and aircraft operations associated with McClellan-Palomar Airport. Palomar Airport Road is currently constructed as a six-lane road adjacent to the site. The existing traffic volume is approximately 37,880 average daily traffic (ADT) (City of Carlsbad, 1995a). City Noise Criteria The City of Carlsbad has established noise guidelines in the City's adopted General Plan Noise Element. These guidelines identify compatible exterior noise levels for various land use types. The maximum acceptable exterior noise level resulting from traffic noise sources for single family residences is a Community Noise Equivalent Level (CNEL) of 60 dB. Aircraft noise from McClellan-Palomar Airport should not exceed a CNEL of 65 dB at the residences. Interior noise levels are not to exceed a CNEL of 45 dB. Attachment 1 contains definitions of acoustical terms used in this report. All sound levels discussed in this report are A-weighted. 605 Third Street • Encinitas, CA 92024 • (619) 436-9877 Mr. Marcus Palkowitsh May 24, 1995 Page 2 Methodology The noise analysis methodology is based on the City's noise assessment methodology documented in the City's Draft Noise Guidelines Manual (City of Carlsbad, 1993). The future noise level along the Palomar Airport Road was determined based on ambient noise measurements and using Caltrans' SOUND32 Highway Traffic Noise Prediction Model (Caltrans, 1983) with California noise emission factors (Caltrans, 1987). The noise model is based on the Federal Highway Administration's traffic noise prediction model (FHWA, 1978). Input used in the noise model included the buildout traffic volume with vehicle speeds of 55 mph along Palomar Airport Road. The truck mix used was 3.52 percent medium trucks and 1.24 percent heavy trucks. The traffic mix is based on vehicle mix surveys conducted by the City. The proposed lots would be located above Palomar Airport Road, therefore, a hard site noise propagation factor was used. The buildout traffic volumes were provided by the City's traffic engineering department. 2.0 EXISTING CONDITIONS Ambient Noise Monitoring Noise measurements were conducted at the site to determine the existing noise levels. The measurements were made using a calibrated Larson-Davis Laboratories Model 700 (S.N. 2132) integrating sound level meter equipped with a Bruel & Kjaer Type 4176 1/2-inch pre-polarized condenser microphone with pre-amplifier. When equipped with this microphone, the sound level meter meets the current American National Standards Institute standard for a Type 1 precision sound level meter. The sound level meter was positioned at a height of approximately five feet above the ground. Two noise measurement locations were selected at the project site and are depicted as Site 1 and Site 2 on Figure 1. These sites were selected because they represent proposed lots which would have the greatest traffic noise exposure. Site 1 is approximately 820 feet from the center line of Palomar Airport Road. Site 2 is approximately 900 feet from the center line of Palomar Airport Road. Both of the noise measurement locations were approximately 20-feet from the existing edge of slope above Palomar Airport Road. Concurrent traffic counts were conducted during the noise measurements. Both Sites 1 and 2 have limited views of Palomar Airport Road due to intervening topography. Base Map Source: Land Space Engineering (5/18/95) NOISE MEASUREMENT LOCATIONS Pacific Noise Control: FIGURE 1 Mr. Marcus Palkowitsh May 24, 1995 Page 4 The measured average noise level was 58 dB at both Sites 1 and 2. The measured noise levels included aircraft noise associated with McClellan-Palomar Airport. To distinguish between the traffic noise level and aircraft noise level, the sound level meter was set to record the sound exposure level (SEL) of the aircraft fly-overs. Two fly-overs occurred during the noise measurement at Site 1 and six fly-overs occurred during the noise measurement at Site 2. When the aircraft noise is subtracted from the overall measured noise level, the average noise level associated with only traffic from Palomar Airport Road is 57 dB at Site 1 and 55 dB at Site 2. Table 1 shows the measured noise levels and the concurrent traffic volumes. TABLE 1 MEASURED NOISE LEVELS AND TRAFFIC VOLUMES Site 1 2 Description Proposed Lot 23 Proposed Lot 21 Date Time 5/19/95 10:00 to 10:20 am 5/19/95 9:25 to 9:45 am W 584/575 dB 58V555 dB Cars 578 568 MT2 22 18 HT3 12 8 Notes:1 Equivalent Continuous Sound Level (Average Sound Level) : Medium Trucks 3 Heavy Trucks 4 Includes aircraft noise associated with McClellan-Palomar Airport. 5 Without aircraft noise from McClellan-Palomar Airport (calculated from noise measurements). General Notes: Two fly-overs occurred during noise measurement at Site 1; Six fly-overs occurred during measurement at site 2. Temperature 60-65 degrees, light wind from west, sunny/hazy. Mr. Marcus Palkowitsh May 24, 1995 Page 5 Noise Modeling The existing CNEL was calculated for the noise measurement locations based on the current traffic volume along Palomar Airport Road using Caltrans' SOUND32 noise model. To verify the input used in the noise model, the same traffic volume and vehicle composition ratios counted during the noise measurements were used. The modeled values were within one dB of the measured noise levels which confirms the assumptions used in the noise model. The CNEL at the measurement sites were calculated by adjusting the traffic volume and truck percentage to a set of normalized conditions (i.e., the City traffic mix and existing ADT). The existing traffic generated CNEL at Sites 1 and 2 are calculated to be 59 and 58 dB, respectively. 3.0 FUTURE CONDITIONS Traffic Noise Palomar Airport Road would be the primary traffic noise source in the future. To determine the maximum noise levels that could be experienced on-site, buildout traffic volumes were used. The buildout traffic volume along Palomar Airport Road adjacent to the project site would be approximately 40,200 ADT (City of Carlsbad, 1995b). All the proposed lots would be exposed to future traffic noise levels of 60 dB or less. At the closest lots to Palomar Airport Road the CNEL would be approximately 54 to 55 dB at Lots 19 and 20; 59 dB at Lot 21; 57 dB at Lot 22; and 60 dB at Lot 23. These noise levels would meet the City's noise guidelines. The noise levels are based on a receiver position located 20 feet from the backyard property line. The SOUND32 noise modeling input/output is included as Attachment 2. McClellan-Palomar Airport McClellan-Palomar Airport is located approximately 1.25-miles east of the site. Noise levels associated with McClellan-Palomar Airport are based on the 1995 noise contour information published in the airport's comprehensive land use plan (SANDAG, 1994). Approximately one- half of the site is located between the 60 and 65 dB CNEL noise contours. Figure 2 depicts the approximate location of the site relative to the 60 and 65 dB CNEL aircraft noise contours. The aircraft CNEL at the proposed lots would be less than the City's noise criteria limit of 65 dB. 1" = 1000' Base Map Source: SANDAG April, 1994 FIGURE 1995 MCCLELLAN-PALOMAR AIRPORT NOISE CONTOURS Pacific Noise Control: Mr. Marcus Palkowitsh May 24, 1995 Page 7 Cumulative Noise The cumulative traffic and aircraft noise at the backyards of Lots 21, 22 and 23 would be approximately 64 to 65 dB CNEL. These lots would have the greatest cumulative noise exposure of any of the proposed lots. Interior Noise Levels The City requires that interior noise levels not exceed a CNEL of 45 dB. Typically, with the windows open, and using standard California construction materials and methods, the building shells provide approximately 15 dB of noise reduction. Therefore, homes exposed to an exterior CNEL greater than 60 dB could result in an interior CNEL greater than 45 dB. Lots 14 to 35 would exceed an exterior noise level of 60 dB. 4.0 MITIGATION Based on a review of the tentative map, future traffic volume and aircraft information, the future noise level at the proposed lots would not exceed the City's exterior noise criteria, therefore, mitigation measures have not been evaluated. To comply with the City's interior noise standard, an interior noise analysis will be required for the project. The interior acoustical analysis would be required for Lots 14 through 35 prior to issuance of building permits to ensure that the interior noise levels would not exceed a CNEL of 45 dB. The homes on these lots would require air-conditioning or mechanical ventilation and could require sound-rated windows or additional sound insulation. Also, the McClellan-Palomar Airport comprehensive land use plan states that for residential uses located within the 60-65 dB CNEL noise contours, appropriate legal notice shall be given to all purchasers, lessees and renters of property which describes the potential for impacts form airplane noise associated with airport operations. Mr. Marcus Palkowitsh May 24, 1995 Page 8 This concludes our noise assessment. If you have any questions, please call me. Sincerely, Mike Komula Principal cc: Bob Ladwig, Ladwig Design Group David Bentley REFERENCES California Department of Transportation (Caltrans), June 1983, User's Instructions for SOUND32 (FHWA/CA-83/06). California Department of Transportation (Caltrans), 1987, California Vehicle Noise Emission Levels, (FHWA/CA/TL-87/03). Carlsbad, City of, September, 1993, City of Carlsbad Draft Noise Guidelines Manual. Carlsbad, City of, May, 1995a, Telephone conversation with Mr. Jim Gales, Traffic Engineering Department. Carlsbad, City of, May, 1995b, Fax ofBuildout Traffic Volume Projections, Traffic Engineering Department. Federal Highway Administration (FHWA), 1978. FHWA Highway Traffic Noise Prediction Model (FHWA-RD-77-108). San Diego Association of Governments (SANDAG), April 1994. Comprehensive Land Use Plan McClellan-Palomar Airport Carlsbad, California. ATTACHMENT 1 DEFINITIONS Term Definition Ambient Noise Level A-Weighted Sound Level, dBA Community Noise Equivalent Level, CNEL Decibel, dB Equivalent Sound Level, Leq (Average Sound Level) Sound Exposure Level, SEL The composite of noise from all sources near and far. The normal or existing level of environmental noise at a given location. The sound pressure level in decibels as measured on a sound level meter using the A- weighted filter network. The A-weighting filter de-emphasizes the very low and very high frequency components of the sound in a manner similar to the frequency response of the human ear and correlates well with subjective reactions to noise. CNEL is the A-weighted equivalent continuous sound exposure level for a 24-hour period with a ten dB adjustment added to sound levels occurring during nighttime hours (10 pm to 7 am) and a five dB adjustment added to the sound levels occurring during the evening hours (7 pm to 10 pm). A unit for measuring sound pressure level and is equal to 10 times the logarithm to the base 10 of the ratio of the measured sound pressure squared to a reference pressure, which is 20 micropascals. The sound level corresponding to a steady state sound level containing the same total energy as a time varying signal over a given sample period. Leq is designed to average all of the loud and quiet sound levels occurring over a time period. The continuous sound level which, when maintained for 1 second, contains the same quantity of sound energy as the actual time varying level of one noise event. Z * * SOUND32 (CALTRANS VERSION OF STAMINA2/OPTIMA) * * INPUT DATA FILE : ERWEST.FUT BARRIER COST FILE : CALIF$.DTA DATE : 05-22-1995 EMERALD RIDGE WEST TRAFFIC DATA LANE NO. 1 2 3 4 LANE LANE NO. 1 2 3 DATA SEG. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 1 2 3 4 5 6 7 8 9 10 AUTO VPH MPH 1914 55 1914 55 1914 55 1914 55 GRADE COR. NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO MEDIUM TRKS HEAVY TRKS VPH 71 71 71 71 X 3330.0 3857.0 4013 .0 4232.0 4423 .0 4607.0 5045.0 5311.0 5578.0 6005.0 6195.0 6398.0 6584.0 6795.0 6938.0 6938.0 7122 .0 7340.0 7584.0 7735.0 3330.0 3853.0 4004.0 4228.0 4417.0 4594.0 5029.0 5290.0 5560.0 5988.0 MPH 55 55 55 55 Y 7755.0 7757.0 7767.0 7810.0 7846.0 7907.0 8081.0 8182.0 8277.0 8435.0 8497.0 8537.0 8562.0 8570.0 8562.0 8562.0 8541.0 8502.0 8463.0 8432.0 7809.0 7812.0 7823.0 7860.0 7902.0 7960.0 8132.0 8230.0 8329.0 8487.0 VPH MPH 25 55 25 55 25 55 25 55 Z 100.0 98.0 95.0 90.0 85.0 80.0 77.0 80.0 82.0 81.0 82.0 84.0 86.0 88.0 90.0 90.0 92.0 96.0 102.0 106.0 100.0 98.0 95.0 90.0 85.0 80.0 77.0 80.0 82.0 81.0 DESCRIPTION Palomar Airport Palomar Airport Palomar Airport Palomar Airport SEGMENT DESCRIPTION EB14 EB15 EB16 EB17 EB18 EB19 EB20 EB21 EB22 EB23 EB24 EB25 EB26 EB26 EB28 EB28 EB29 EB30 EB31 EB32 WB14 WB15 WB16 WB17 WB18 WB19 WB20 WB21 WB22 WB23 Road Road Road Road 11 12 13 14 4 1 2 3 4 NO NO NO NO NO NO NO NO 6177 6389 6583 6797 6934 6934 7134 7349 7585 7755 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 8546. 8593. 8620. 8622. 8617. 8617. 8598. 8561. 8524. 8484. 0 0 0 0 0 0 0 0 0 0 82 83 86 88 90 90 92 96 102 106 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 WB24 WB25 WB26 WB27 WB28 WB28 WB29 WB30 WB31 WB32 BARRIER DATA Barrier No. 1 Type - (l)BERM Height Increment (DELZ)= 0.0 Description: Topography (East Side Slope) No. Height Changes (P)=0 SEG. 1 2 3 4 5 6 6276 6290 6298 6315 6327 6343 6354 X .0 .0 .0 .0 .0 .0 .0 7699 7617 7560 7422 7383 7285 7213 Y .0 .0 .0 .0 .0 .0 .0 GROUND (ZO) 110 130 140 150 160 180 190 .0 .0 .0 .0 .0 .0 .0 TOP (Z) 110 130 140 150 160 180 190 .0 .0 .0 .0 .0 .0 .0 *S1 *S2 *S3 *S4 *S5 *S6 *S7 BARRIER HEIGHTS AT ENDS * * * * * * * 0 0 0 0 0 0 0 Barrier No. 2 Type - (l)BERM Height Increment (DELZ)= 0.0 Description: Topography (West Side Slope) No. Height Changes (P)=0 SEG. 1 2 3 4 5 6 7 8 9 4934 5029 5115 5198 5218 5237 5263 5275 5296 5322 X .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 7165 7279 7283 7262 7265 7279 7311 7318 7321 7316 Y .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 GROUND (ZO) 170 178 177 177 177 177 177 177 177 177 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 TOP (Z) 170. 178. 177. 177. 177. 177. 177. 177. 177. 177. 0 0 0 0 0 0 0 0 0 0 *T1 *T2 *T3 *T4 *T5 *T6 *T7 *T8 *T9 *T10 BARRIER HEIGHTS AT ENDS * * * * * * * * * * 0 0 0 0 0 0 0 0 0 0 Barrier No. 3 Type - (l)BERM Height Increment (DELZ)= 0.0 Description: Topography (West Side) No. Height Changes (P)=0 SEG. 1 2 X 5322.0 5350.0 Y 7316.0 7300.0 GROUND (ZO) 177.0 177.0 TOP (Z) 177.0 *T10 177.0 *T11 BARRIER HEIGHTS AT ENDS * 0 * 0 3 4 5 6 7 8 9 5375 5398 5412 5442 5453 5483 5508 5528 .0 .0 .0 .0 .0 .0 .0 .0 7270 7230 7194 7113 7078 7026 6971 6913 .0 .0 .0 .0 .0 .0 .0 .0 177 177 177 176 176 175 174 174 .0 .0 .0 .0 .0 .0 .0 .0 177 177 177 176 176 175 174 174 .0 .0 .0 .0 .0 .0 .0 .0 *T12 *T13 *T14 *T15 *T16 *T17 *T18 *T19 * * * * * * * * 0 0 0 0 0 0 0 0 RECEIVER DATA REC. NO. 1 2 3 4 5 6 5434 5422 5340 5218 5115 5115 X .0 .0 .0 .0 .0 .0 Y 7069. 7104. 7283 . 7245. 7263. 7258. 0 0 0 0 0 0 181 181 182 182 182 182 Z .0 .0 .0 .0 .0 .0 DNL 60 60 60 60 60 60 PEOPLE 1 1 1 1 1 1 ID Lot Lot Lot Lot Lot Lot 19 20 21 22 23 23 DROP-OFF RATES ALL LANE/RECEIVER PAIRS = 3.0 DBA K - CONSTANTS ALL LANE RECEIVER/PAIRS = 0.0 DBA 13 14 15 16 17 18 19 20 21 22 23 24 0 1 REG REC ID 1 Lot 19 2 Lot 20 3 Lot 21 4 Lot 22 5 Lot 23 6 Lot 23 0.* 0.* 0.* 0.* 0.* 0.* 0.* 0.* 0.* 0.* 0.* 0.* 123456 DNL PEOPLE LEQ(CAL) 60. 1. 54.5 60. 1. 54.4 60. 1. 58.6 60. 1. 57.1 60. 1. 59.5 60. 1. 57.2 T7 T8 T9 T10 Til T12 T13 T14 T15 T16 T17 T18 7 13 21 26 32 39 46 38 86 36 60 60 61 .9 .2 .5 .2 .1 .1 .6 .4 .7 .0 .4 .4 BERM BERM BERM BERM BERM BERM BERM BERM BERM BERM BERM BERM BARRIER TYPE COST BERM MASONRY 0. 0. MASONRY/ JERSEY 0 . CONCRETE 0. TOTAL COST = $0. BARRIER HEIGHT INDEX FOR EACH BARRIER SECTION 111111111111111111111111 CORRESPONDING BARRIER HEIGHTS FOR EACH SECTION 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.