2600 Capitol Avenue Suite 200 Sacramento, CA phone fax

Size: px

Start display at page:

Download "2600 Capitol Avenue Suite 200 Sacramento, CA phone fax"

Elisabeth Lynch
5 years ago
Views:

1 26 Capiol Avenue Suie 2 Sacrameno, CA phone fax memorandum dae Sepember 2, 216 o from subjec Richard Rich, Ciy of Sacrameno; Jeffrey Dorso, Pioneer Law Group Brian Boxer and Chrisina Erwin, A Proposed Major League Soccer adium Noise Conours Revised 1. INTRODUCTION Based on direcion provided by he Ciy of Sacrameno Planning and Design Commission on Augus 11, 216, A used he mos curren available informaion o remodeled noise conours for he proposed MLS adium wihin he Railyards Specific Plan Area (RSP Area). Planning Commissioners requesed addiional informaion regarding noise levels expeced from he proposed MLS adium. They requesed wo daa ses: 1) Assume some developmen in he RSP Area and show noise conours down o he dba level o reflec he Ciy s nighime exerior noise sandard. 2) Assume no oher developmen in he RSP Area (essenially a Day One analysis for he MLS adium) and show noise conours down o he dba. For boh daa ses, we modeled he same hree scenarios previously analyzed: a) soccer game, b) pre-game evens a ouside sages, and c) music concer in he adium. This echnical memorandum describes he mehodology used for he assessmen and presens he resuls wih noise conour maps. The informaion in his memorandum updaes and augmens informaion provided in he Railyards EIR and he noise echnical memorandum provided on July 1, 216.

2 2. METHODOLOGY This secion describes mehodologies used for his MLS adium noise impac assessmen. The noise model used and he model validaion mehodology remain idenical o ha described in he July 1, 216 noise echnical memorandum. 2.1 Noise Model The Compuer Aided Noise Abaemen (CadnaA) noise propagaion program (Version 4.6.1) was used o esimae he propagaion of noise from he proposed MLS adium. CadnaA is a Windows-based sofware program ha predics and assesses noise levels in he viciniy of noise sources based on Inernaional Organizaion for andardizaion algorihms for noise propagaion calculaions. The calculaions accoun for classical sound wave divergence plus aenuaion facors resuling from air absorpion, basic ground effecs, and barrier/shielding. 2.2 Model Validaion The dominan noise sources from a soccer game include crowd shouing and public address announcemen. In order o esablish he noise sources in he model, noise measuremen daa colleced from he soccer game beween he Sacrameno Republic Fooball Club (Sac Republic FC) and Colorado Rapids a Bonney Field on February 13, 21 was used o validae he model. Secion 4.1 of he Draf Subsequen Environmenal Impac Repor (EIR) for he Railyards Specific Plan Updae saed ha he noise level during he soccer game was 72.3 dba L eq a 272 fee from he cener of Bonney Field. Noe ha he noise level of 72.3 dba L eq was based on 3-minue averages and included boh crowd and public address sysem noise. The model validaion ask is o develop he noise model o re-creae he same measuremen environmen. The Bonney Field seaing areas were used as he noise source, which generae noise level of 72.3 dba a he acual measuremen locaion. The resul of he validaed noise source was used for he proposed MLS adium noise model. 2.3 Assumpions Several key assumpions were made for he model. Below describes each assumpion. The following bulleed lis applies o boh daa ses boh wih surrounding developmen in he RSP Area and wihou ha developmen. The proposed MLS adium capaciy is 2, for a soccer game and 27, for a music concer. Three emporary sage locaions wihin he plaza, bu ouside of he MLS adium, were evaluaed. Each emporary sage would have amplified sound. Noise source levels a each of hese sages were assumed o be 1 dba a fee, as described in Miigaion Measure 4.1-2(b) in Secion 4.1 of he EIR. Music evens wihin he MLS adium would ake place on a sage a he souhern end of he pich. Noise source levels a his sage were assumed o be 98dBA a 1 fee, consisen wih Ciy Municipal Code secion Noise sources oher han adium-relaed evens were no considered for he noise conour developmen. Those poenial noise sources would include rail, vehicular raffic, and KP Medical Cener helicoper operaions. Proposed Major League Soccer adium Noise Conours Revised Page 2

3 Exising building fooprins were obained from Sacrameno Couny GIS Daa Library. Topographic daa ouside of he proposed MLS adium was obained from USGS The Naional Map GIS Daa. For he firs daa se, we assumed some developmen in he RSP Area. Fuure srucures wihin he RSP Area were included as Buil-Up Area in he model using he following assumpions: Lo 47ab Heigh would be 8 fee and % of he parcel would be developed. Lo 48ab Heigh would be 2 fee and % of he parcel would be developed. Lo 49ab Heigh would be 12 fee and % of he parcel would be developed. Lo Heigh would be 11 fee and % of he parcel would be developed. Lo 1a Heigh would be 4 fee and 2% of he parcel would be developed. Lo 1b Heigh would be 3 fee and % of he parcel would be developed. Lo 6abcd Heigh would be 12 fee and % of he parcel would be developed. Lo 7bcd Heigh would be 1 fee and 9% of he parcel would be developed. Lo 69abcd Heigh would be 12 fee and % of he parcel would be developed. Lo 7abd Heigh would be 8 fee and 9% of he parcel would be developed. For he second daa se, we did no assume developmen in he RSP Area beyond he exising Cenral Shops buildings. Zero developmen was assumed on he los lised above. This noise modeling accouns for he proposed design of he MLS adium including he srucure heigh, building maerials, locaions of enries and exis, roof srucure design, and sie grading and opography. This analysis also akes ino accoun he capaciy of he sadium for all ypes of anicipaed evens, noise anicipaed from hose crowds, and specific locaions of even sages. Furher, he model inpus include deails abou he opography of he surrounding area, as well as surrounding exising and proposed building heighs, locaions, and sie coverage. 3. FINDINGS Figures 1a, 1b, and 1c represen he noise conours ha can be expeced during a soccer game, pre-game evens ouside of he adium from hree sages operaing concurrenly, and a music concer wih a sage inside he MLS adium, respecively. These figures assume some levels of developmen on surrounding RSP los as described above in he Mehodology and Assumpions secion. Noise conours down o dba L eq are presened, which is he hreshold for he nighime noise level as i is described in he Ciy of Sacrameno Noise Ordinance. Figures 2a, 2b, and 2c represen he noise conours ha can be expeced during a soccer game, pre-game evens ouside of he adium from hree sages operaing concurrenly, and a music concer wih a sage inside he MLS adium, respecively. These figures assume no developmen on surrounding RSP los, and represen a Day One scenario for he MLS adium. Noise conours down o dba L eq are presened, which is he hreshold for he nighime noise level as i is described in he Ciy of Sacrameno Noise Ordinance. Noise resuling from proposed evens a he MLS adium would affec differen areas of he surrounding parcels o varying degrees. Due o building design and oher facors described above, areas o he souhwes, wes, and norh of he MLS adium would be affeced by amplified and crowd noise he mos. Noise would ravel along unobsruced corridors such as local roadways and beween exising and proposed buildings, creaing somewha defined noise conours along hose linear pahways. Sound from a music even inside he Proposed Major League Soccer adium Noise Conours Revised Page 3

4 MLS adium would ravel he farhes, followed by noise from a soccer game and noise from amplified noise a he oudoor sages. For each of he evens ha could be held a he MLS adium, he noise conours beween he wihdevelopmen and zero developmen daa ses are no very differen, paricularly close o he MLS adium. Differences can be seen much farher away from he MLS adium, bu he differences are relaively minor. Aachmens: Figure 1a MLS adium Soccer Game Noise Conour Map Wih Developmen Figure 1b MLS adium Ouside ages Noise Conour Map Wih Developmen Figure 1c MLS adium Music Concer Noise Conour Map Wih Developmen Figure 2a MLS adium Soccer Game Noise Conour Map Zero Developmen Figure 2b MLS adium Ouside ages Noise Conour Map Zero Developmen Figure 2c MLS adium Music Concer Noise Conour Map Zero Developmen Proposed Major League Soccer adium Noise Conours Revised Page 4

5 Am er an ic R iv er Richard s Blvd adium J 3rd S I GS Noise Conour dba Leq dba Leq 6 dba Leq 2 h v er f 16 h o R i 1f 1f 7 dba Leq 19 h men 2f 12 h S ac r a Jiboom 16 1, Fee SOURCE: Google, 216; Kimley Horn, 21; HNTB, 216; A, 216 Service Layer Credis: Railyards Specific Plan Updae Figure 1a MLS adium - Soccer Game Noise Conour Map - Wih Developmen

6 B lv d R i ch a rd s 1f f 16 h 1f 12 h 2f adium 6h age Noise Conour dba Leq 6 dba Leq dba Leq 7 dba Leq 8 Fee SOURCE: Google, 216; Kimley Horn, 21; HNTB, 216; A, 216 Service Layer Credis: Railyards Specific Plan Updae Figure 1b MLS adium - Ouside ages Noise Conour Map - Wih Developmen

dba Leq 21s Rich a 2, Fee SOURCE: Google, 216; Kimley Horn, 21; HNTB, 216; A, 216 Service Layer Credis:

7 Garden Highw ay American River 16 rds B lvd 12h HS I dba Leq 6 dba Leq dba Leq L adium Noise Conour 19h ll l Ma J 9h 1h h m en ac ra S 3rd r Cap i o 1h 16h ay e w a G i ve ge F o R ri d rb e w To 2f 1f 1f f 7 dba Leq 21s Rich a 2, Fee SOURCE: Google, 216; Kimley Horn, 21; HNTB, 216; A, 216 Service Layer Credis: Railyards Specific Plan Updae Figure 1c MLS adium - Music Concer Noise Conour Map - Wih Developmen

8 Am er an ic R iv er Richard s Blvd adium J 3rd S I GS Noise Conour dba Leq dba Leq 6 dba Leq 2 h v er f 16 h o R i 1f 1f 7 dba Leq 19 h men 2f 12 h S ac r a Jiboom 16 1, Fee SOURCE: Google, 216; Kimley Horn, 21; HNTB, 216; A, 216 Service Layer Credis: Railyards Specific Plan Updae Figure 2a MLS adium - Soccer Game Noise Conour Map - Zero Developmen

9 B lv d R i ch a rd s 1f f 16 h 1f 12 h 2f adium 6h age Noise Conour dba Leq 6 dba Leq dba Leq 7 dba Leq 8 Fee SOURCE: Google, 216; Kimley Horn, 21; HNTB, 216; A, 216 Service Layer Credis: Railyards Specific Plan Updae Figure 2b MLS adium - Ouside ages Noise Conour Map - Zero Developmen

7 dba Leq 21s Rich a 2, Fee SOURCE: Google, 21; Kimley Horn, 216; HNTB, 216; A, 216 Service Layer Credis:

10 Garden Highw ay American Rive r 16 rds B lvd 12h HS I dba Leq 6 dba Leq dba Leq L adium Noise Conour 19h ll l Ma J 9h 1h h en m ac ra S 3rd r Cap i o 1h S 16h ay e w a G i ve ge F o R ri d rb e w To 2f 1f 1f f 7 dba Leq 21s Rich a 2, Fee SOURCE: Google, 21; Kimley Horn, 216; HNTB, 216; A, 216 Service Layer Credis: Railyards Specific Plan Updae Figure 2c MLS adium - Music Concer Noise Conour Map - Zero Developmen

Parameters Affecting Lightning Backflash Over Pattern at 132kV Double Circuit Transmission Lines

Parameters Affecting Lightning Backflash Over Pattern at 132kV Double Circuit Transmission Lines Parameers Affecing Lighning Backflash Over Paern a 132kV Double Circui Transmission Lines Dian Najihah Abu Talib 1,a, Ab. Halim Abu Bakar 2,b, Hazlie Mokhlis 1 1 Deparmen of Elecrical Engineering, Faculy