Measurement Report -San Francisco General Hospital CSA Project No

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1 " Charles M Salter...'C.".l'., i Consultants in Acoustics & AudioNisual System Design' 130 Sutler Street San Francisco California 94104' Tel: ? Fax: cmsalter@ cms8lter:coln Mike McClintock, AICP Gerson/Overstreet Architects 116 Natoma Street Third Floor San Francisco, CA Subject: Measurement Report -San Francisco General Hospital CSA Project No Charles M Salter, PE David R Schwind, FAES Anthony P Nash..PE Eva Duesler Thomas A Schindler, PE r Aosen Freytag; PE Harold S Goldberg, Pf Kenneth W Graven, PE, TImOthy M Der Eric L Broadhurst, PE Michael D Toy, PE Thomas J Corbel! Durand R Begau1t, Ph.D. Robert B Skye Ross A Jerozal Dear Mike: The following presents the results of environmental monitoring performed January 2-3, 2003 at three locations around San Francisco General Hospital. LOCATION #1- NORTH SIDE OF 22ND ST. BETWEEN POTRERO AVE. & HAMpSHIRE ST. The first measurement location was in a residential area just west of San Francisco General Hospital; see below for a map and photo. The monitor was placed on a telephone pole at a height of9 feet above the sidewalk. A ten-minute spot measurement was also made at the monitor location to obtain a more precise characterization of the short-term noise environment at this location. The noise environment was dominated by local traffic ( cars and light trucks) on 22nd Street and traffic on Potrero Avenue. In addition, pedestrians and occasional airplane flyovers made some contribution to the overall noise environment. The graph on the following page illustrates the measured noise environment. Philio N Sanders J4Aie A Malork Robert P Alvarad Joev G O'Anaelo Joe Blackburn Bnlnda RYes Eric A Yee rl1110lhy C McLain rrov Gimbel Pamela M Void Kevin Frye.,-"'-- ".,"--

2 McClintock, Mike Page 2 Location 1 -North Side of 22nd Street between Potrero and Hampshire m "Qj > 0) -l "0 c: j 0 (/) "0 0) CI.0; -i. The DNL measured over the 24-hour period was 68 db. Attached to this report is a graph showing the hourly noise levels (Leq) as well as the overall measured DNL. The table on the next page shows measured hourly Lea levels for this location.

3 Page 3 11:00-12:00 12:00-13:00 13:00-14:00 14:00-15:00 15:00-16:00 16:00-17:00 17:00-18:00 18:00-19:00 19:00-20:00 20:00-21:00 21 :00-22:00 22:00-23:00 23:00-0:00 0:00-1:00 1 :00-2:00 2:00-3:00 3:00-4:00 4:00-5:00 5:00-6:00 6:00-7:00 7:00-8:00 8:00-9:00 9:00-10:00 10:00 -II : LOCA TION #2 -SAN BRUNO AVE. AT 23RD STREET The second measurement location was in a residential area just south of San Francisco General Hospital. The monitor was placed on a telephone pole at a heiht of8 feet above the sidewalk on the east side of San Bruno Ave. just south of23r Street; the map and photo on the following page illustrate the measurement location. A ten-minute spot measurement was also made at the monitor location to obtain a more precise characterization of the short-term noise environment at this location. The noise environment was dominated by traffic (cars and light trucks) on 23rd Street and San Bruno Avenue. Most of the traffic was due to the parking structure located across the street and general hospital circulation. In addition, pedestrians and occasional airplane flyovers made some contribution to the overall noise environment. The graph on the following page illustrates the measured noise environment.

4 Page 4 Location 2 -San Bruno Avenue at 23rd Street ' "00 07' Time (minutes)

5 Page 5 The DNL measured over the 24-hour period was db. Attached to this report is a graph showing the hourly noise levels (Leq} as well as the overall measured DNL. The table on the next page shows measured hourly Leq levels for this location. 10:00-11:00 11:00-12:00 12:00-13:00 13:00-14:00 14:00-15:00 15:00-16:00 16:00-17:00 17:00-18:00 18:00-19:00 19:00-20:00 20:00-21:00 21:00-22:00 22:00-23:00 23:00-0:00 0:00-1:00 1:00-2:00 2:00-3:00 3:00-4:00 4:00-5:00 5:00-6:00 6:00-7:00 7:00-8:00 8:00-9:00 9:00-10:00 I0:00-II: LOCATION #3- DEHARO AVENUE AT 24TH STREET The third measurement location was in a residential area east of San Francisco General Hospital. The monitor was placed on a telephone pole at a height of 8 feet above the sidewalk on the west side ofdeharo Ave. at the comer of24th Street; the map and photo on the following page illustrates the measurement location. A ten-minute spot measurement was also made at the monitor location to obtain a more precise characterization of the short-term noise environment at this location. Background noise is controlled by US Highway 101 and punctuated with occasional local traffic and aircraft flyovers. The graph on the following page illustrates the measured noise environmenl

6 Page 7 The DNL measured over the 24-hour period was db. Attached to this report is a graph showing the hourly noise levels (Leq) as well as the overall measured DNL. The table on the next page shows measured hourly Leq levels for this location. 11:00-12:00 12:00-13:00 13:00-14:00 14:00-15:00 15:00-16:00 16:00-17:00 17:00-18:00 18:00-19:00 19:00-20:00 20:00-21 :00 21:00-22:00 22:00-23:00 23:00-0:00 0:00-1:00 1:00-2:00 2:00-3:00 3:00-4:00 4:00-5:00 5:00-6:00 6:00-7:00 7:00-8:00 8:00-9:00 9:00-10:00 10:00-11 : If you have any questions regarding the measurements, you can contact me at x272. Sincerely, CHARLES M. SALTER ASSOCIATES, INC. Randy D. Waldeck Consultant RDW Enclosures \\CSA Projects\y2002\0243S_JCF _O1JanO3rdw(Measurement Report).doc