Noise and Vibration Assessment

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Figure 1Noise Measurement Locationsfrom distant traffic along SR 24 was also apparent at the time of testing. Similarly, the local trafficnoise measured along Contra Costa Road at site ST-2 was intermittent, and distant freeways wereaudible. The location of ST-3 was selected to monitor noise levels along Broadway Terrace where itmerges with Golden Gate Avenue, just before the junction. While ST-3 was well shielded fromtraffic noise at the junction, some noise from nearby transformers was captured. Noise levels fromProctor Avenue were measured at site ST-4 where it intersects Agnes Street. Most of the local trafficat ST-4 consisted of automobiles, and two heavy-duty trucks were also monitored. The noise levelsmeasured at ST-5 included sparse local traffic along Harbord Drive and an overhead jet. Byselecting these different sites, the noise environment throughout the Specific Plan Area wascharacterized.Noise measurements were made with a Larson Davis Model 820 Integrating Sound Level Meter set7
at “slow” response. The sound level meter was equipped with a G.R.A.S. Type 40AQ ½ - inchrandom incidence microphone fitted with a windscreen. All instrumentation used meets therequirements of the American National Standards Institute (ANSI) SI.4-1983 for Type 1 use. Thesound level meter was calibrated prior to the noise measurements using a Larson Davis ModelCAL200 acoustical calibrator. The response of the system was checked after each measurementsession and was always found to be within 0.2 dBA.Table 4 Summary of Short-Term Noise Measurement Data – July 9, 2010TimeLocation(Duration)ST-1: Across Roble Road fromRoble Court intersection, ~20 feetfrom roadwayST-2: Front yard of 6300 ContraCosta Road, ~110 yards from deadendST-3: Front yard of 6160Broadway Terrace, ~55 yardsnorth of Broadway junctionST-4: Empty lot at the west-sidecorner of the Agnes-ProctorintersectionST-5: Front yard of 5410 HarbordDrive10:30 a.m.(15 min)11:45 a.m.(15 min)12:30 p.m.(15 min)1:00 p.m.(15 min)1:45 p.m.(15 min)A-Weighted Noise Levels, dBAL eq L max L min L 01 L 10 L 50 L 9053 67 48 62 55 52 5046 62 41 56 47 43 4261 82 41 69 63 53 4653 72 45 65 64 48 4660 74 43 71 65 49 448
Page 1 and 2: DINGEE BACKBONE PIPELINE REPLACEMEN
Page 3 and 4: noise at any instant in time, commu
Page 5 and 6: Table 1Definitions of Acoustical Te
Page 7: Table 3 Reaction of People and Dama
Page 11 and 12: Mobile Equipment. Maximum sound lev
Page 13 and 14: used to provide the highest level o
Page 15 and 16: Table 7Typical Range of Noise Level
Page 17 and 18: Major Project Cases:a) Such activit
Page 19: construction activities would be of

Noise and Vibration Assessment

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