Noise and Vibration Assessment

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Table 8Construction Noise Levels During Installation of Pipelines at 50 FeetReceiverMaximumInstantaneous NoiseLevel, L maxAverage NoiseLevel, L eqDaytime Ambient,L eqNoise Increase aboveAmbient + 5 dBAST-1 89 dBA 86 dBA 53 dBA 28 dBAST-2 89 dBA 86 dBA 46 dBA 35 dBAST-3 89 dBA 86 dBA 61 dBA 20 dBAST-4 89 dBA 86 dBA 53 dBA 28 dBAST-5 89 dBA 86 dBA 60 dBA 21 dBAThe project would also result in a maximum of 59 one-way trips per day and a maximum of 4 trucksand 13 vehicles during any hour. Worker trips would primarily be concentrated during the morningand evening commute periods and at lunch. A credible worst-case scenario was developed tocalculate the increase in traffic noise levels expected as a result of project construction trips. Thisscenario assumed that during the worst traffic hour, there would be up to 13 worker trips and 4 trucktrips traveling along roadways serving the site. The hourly average noise level resulting from thesetrips was calculated to be 56 dBA L eq at 50 feet from the roadway center. Project construction tripswould generate noise levels approximately 3 dBA L eq above ambient noise levels at receivers ST-1and ST-4, approximately 10 dBA L eq above ambient noise levels at ST-2, and 4 to 5 dBA L eq belowambient noise levels measured at Sites ST-3 and ST-5.The following available controls are assumed to be included in the project to reduce constructionnoise levels as low as practical. In Oakland, the inclusion of these controls is assumed to reduce theimpact from project construction to less-than-significant levels. Recognizing that projectconstruction trips would coincide with construction equipment noise levels generated in the vicinity,and that the anticipated noise levels would exceed the significance criterion over a relatively shortduration, the impact would also be considered less than significant. All City of Oakland StandardConditions of Approval regarding noise control measures must be implemented at the project site atall times:Construction Related Noise Control During All Construction ActivitiesDays/Hours of Construction Operation - Ongoing throughout demolition, grading, and/orconstructionThe project applicant shall require construction contractors to limit standard construction activities asrequired by the City Public Works Department.15
Major Project Cases:a) Such activities are limited to between 7:00 a.m. and 7:00 p.m. Monday through Friday,with pile driving and/or other extreme noise generating activities greater than 90 dBAlimited to between 8:00 a.m. and 4:00 p.m. Monday through Friday.b) Any construction activity proposed to occur outside of the standard hours of 7:00 am to7:00 pm Monday through Friday for special activities (such as concrete pouring whichmay require more continuous amounts of time) shall be evaluated on a case by case basis,with criteria including the proximity of residential uses and a consideration of resident’spreferences for whether the activity is acceptable if the overall duration of construction isshortened and such construction activities shall only be allowed with the prior writtenauthorization of the Building Services Division.c) Construction activity shall not occur on Saturdays, with the following possibleexceptions:I. Prior to the building being enclosed, requests for Saturday construction forspecial activities (such as concrete pouring which may require more continuousamounts of time), shall be evaluated on a case by case basis, with criteriaincluding the proximity of residential uses and a consideration of resident’spreferences for whether the activity is acceptable if the overall duration ofconstruction is shortened. Such construction activities shall only be allowed onSaturdays with the prior written authorization of the Building Services Division.No extreme noise generating activities shall be allowed on Saturdays, with noexceptions.Formatted: Numbered + Level: 1 +Numbering Style: a, b, c, … + Start at: 3 +Alignment: Left + Aligned at: 0.5" + Tab after:0.75" + Indent at: 0.75"Formatted: Numbered + Level: 1 +Numbering Style: I, II, III, … + Start at: 1 +Alignment: Left + Aligned at: 0.75" + Tabafter: 1.25" + Indent at: 1.25"II.After the building is enclosed, requests for Saturday construction activities shallonly be allowed on Saturdays with the prior written authorization of the BuildingServices Division, and only then within the interior of the building with the doorsand windows closed.Formatted: Numbered + Level: 1 +Numbering Style: I, II, III, … + Start at: 1 +Alignment: Left + Aligned at: 0.75" + Tabafter: 1.25" + Indent at: 1.25"d) No extreme noise-generating activities shall be allowed on Saturdays, with no exceptions.e) No construction activity shall take place on Sunday or Federal holidays.f) For clarification, construction activities include but are not limited to: truck idling,moving equipment (including trucks, elevators, etc) or materials, deliveries, andconstruction meetings held on-site in a non-enclosed area.Noise Control - Ongoing Throughout Demolition, Grading, and/or ConstructionTo reduce noise impacts due to construction, the project applicant shall require constructioncontractors to implement a site-specific noise reduction program, subject to city review and approval,which includes the following measures:a) Equipment and trucks used for project construction shall utilize the bestFormatted: Numbered + Level: 1 +Numbering Style: a, b, c, … + Start at: 3 +Alignment: Left + Aligned at: 0.5" + Tab after:0.75" + Indent at: 0.75"Formatted: Numbered + Level: 1 +Numbering Style: a, b, c, … + Start at: 3 +Alignment: Left + Aligned at: 0.5" + Tab after:0.75" + Indent at: 0.75"Formatted: Numbered + Level: 1 +Numbering Style: a, b, c, … + Start at: 3 +Alignment: Left + Aligned at: 0.5" + Tab after:0.75" + Indent at: 0.75"Formatted: Numbered + Level: 2 +Numbering Style: a, b, c, … + Start at: 1 +Alignment: Left + Aligned at: 1.25" + Tabafter: 1.5" + Indent at: 1.5"16
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 and 8: Table 3 Reaction of People and Dama
Page 9 and 10: at “slow” response. The sound l
Page 11 and 12: Mobile Equipment. Maximum sound lev
Page 13 and 14: used to provide the highest level o
Page 15: Table 7Typical Range of Noise Level
Page 19: construction activities would be of

Noise and Vibration Assessment

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