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STATEWIDE NOISE STUDY REPORT

VIEWS: 17 PAGES: 7

									STATEWIDE NOISE STUDY REPORT




               Prepared by:

    Oregon Department of Transportation
          Environmental Services

                April 1996
              STATEWIDE NOISE STUDY REPORT

SUMMARY

The Statewide Noise Study Report addresses highway construction projects which need
a noise study per the FHWA Noise Standard, 23 CFR 772, but by their usage or
location do not warrant a project-specific noise analysis. Highway projects which
qualify for this exception include: 1) projects that have present and projected traffic
volumes low enough so that traffic noise impacts are not predicted, or 2) projects that
do not have any residences, schools, churches, parks, hospitals, commercial activities,
or other developed areas in the immediate project vicinity.


PROJECT CATEGORY DESCRIPTION

The statewide noise study report is applicable to proposed Federal or Federal-Aid
highway projects which include: 1) the construction of highways on new locations, 2)
the reconstruction of existing highways which significantly change either the horizontal
or vertical alignment, or 3) the reconstruction of existing highways which increase the
number of through-traffic lanes. Specifically, this report applies to projects with very
low traffic volumes. Such low volumes will not generate noise levels above the noise
impact level of Leq 65 dBA at 15 meters from the highway centerline. As such, traffic
noise impacts will not be anticipated for developed areas that include residences,
schools, churches, parks, or commercial activities. This report applies to both the
modification of existing alignments and to new alignments, provided the centerline of
the new alignment is not more than 60 meters from the centerline of the existing
alignment. Alignment shifts of 60 meters or less will cause noise levels to increase by 9
dBA or less. Thus, noise impacts would not be created through the substantial noise
increase criteria of 10 dBA.


LAND USE

Land use that includes residences, schools, churches, parks, hospitals, commercial
activities, or other developed areas (Activity Category B, C, and D) that is covered by
this report, see Figure 1: FHWA noise abatement criteria. Lands on which serenity
and quiet are of extraordinary significance (Activity Category A) and developed lands
which do not have exterior activity areas (Activity Category E) are not covered in this
report.
TRAFFIC NOISE ANALYSIS

The traffic noise analysis uses the FHWA Traffic Noise Prediction Model (FHWA-RD-
77-108). For the purpose of the acoustic analysis, the following assumptions were
made:

       Receptor Distance:         15 meters from roadway centerline. This is the
distance
                                  where frequent human use would typically occur.

       Site Characteristics:             Hard site, infinite flat roadway, no shielding
from                                     topography or buildings, and flat terrain.

       Vehicle Speeds:            30, 40, 50, 60, 70, 80, 90, 100, 110, and 120 km/hr

      Traffic Characteristics:    Peak Hour Traffic Volume (PHT) = 21% of ADT
volume
                                  Truck Volume = 30% of PHT Volume
                                  (27% Heavy Trucks, 3% Medium Trucks)

       Study Year:                2015

To determine the Peak Hour Truck Vehicular Mix, the 1992 Traffic Volume Tables were
used. Highways with ADT volumes of less than 2000 vehicles were surveyed. The ten
highest truck percentages from those highways were averaged to provide the truck
percentages.

Based on the above assumptions, the acoustical analysis determined that the traffic
volumes and speeds listed below would result in predicted noise levels of Leq 64 dBA at
a distance of 15 meters from the roadway centerline.


            Year                   Speed                        ADT
            2015                  30 km/hr                      950
                                  40 km/hr                      600
                                  50 km/hr                      450
                                  60 km/hr                      300
                                  70 km/hr                      250
                                  80 km/hr                      200
                                  90 km/hr                      150
                                 100 km/hr                      140
                                 110 km/hr                      130
                                 120 km/hr                      110
Projects having ADT volumes equal to or less than those listed at the design traffic
speeds will not generate noise levels equal to or greater than the noise impact criteria
of Leq 65 dBA for residences schools, churches, or parks, or the noise impact criteria for
commercial activities of Leq 70 dBA.
NOISE ABATEMENT MEASURES

Traffic noise mitigation measures are not required as present or future traffic noise
impacts are not anticipated.


CONSTRUCTION NOISE ANALYSIS

Areas adjacent to the project will be exposed to construction noise. This noise will be
produced by various pieces of construction equipment. Figure 2 shows the typical range
of noise levels for construction equipment which may be used during construction of a
project.

As shown in Figure 2, areas adjacent to the right-of-way line could be exposed to high
noise levels during construction. Although of a temporary nature, the additional noise
can be quite annoying. This is especially true during quieter periods. Therefore,
construction will be limited to daytime hours with no work on Sundays or legal
holidays. This restriction will be included in the contract specifications. In addition,
the contract specifications will include items which comply with U.S. Environmental
Protection Agency equipment noise standards, muffled exhaust and added restrictions
for pile driving or blasting operations.

The following construction noise abatement measures will be included in the project
specifications:

           1. No construction shall be performed within 300 meters of an occupied
              dwelling unit on Sundays, legal holidays and between the hours of 10:00
              p.m. and 6:00 a.m. on other days without the approval of the Project
              Manager.

           2. All equipment used shall have sound control devices no less effective than
              those provided on the original equipment. No equipment shall have
              unmuffled exhaust.

           3. All equipment shall comply with pertinent equipment noise standards of
           the
              U.S. Environmental Protection Agency.

           4. No pile driving or blasting operations shall be performed within 900
           meters
              of an occupied dwelling unit on Sundays, legal holidays and between the
              hours of 8:00 p.m. and 8:00 a.m. on other days, without the approval of
              the Project Manager.

           5. The noise from rock crushing or screening operations performed within
           900
             meters of any occupied dwelling shall be mitigated by strategic placement
             of material stockpiles between the operation and the affected dwelling or
             by other means approved by the Project Manager.

Should a specific noise impact complaint occur during the construction of the project,
the contractor at their own expense may be required to implement one or more of the
following noise mitigations as directed by the Project Manager.

          1. Locate stationary construction equipment as far from nearby noise
          sensitive
             properties as possible.

          2. Shut off idling equipment.

          3. Reschedule construction operations to avoid periods of noise annoyance
             identified in the complaint.

          4. Notify nearby residences whenever extremely noisy work will be
          occurring.

          5. Install temporary or portable acoustic barriers around stationary
             construction noise sources.

Local governments may have noise ordinances which control construction noise.
Construction activities shall be in compliance with any local noise ordinances.


COORDINATION WITH LOCAL GOVERNMENT OFFICIALS

Projects included under the Statewide Noise Study Report are not expected to exceed
the FHWA noise abatement criteria, and are assumed to be compatible with adjacent
land use. The Statewide Noise Study Report therefore satisfies the intent of 23 CFR
772.15. Local agency coordination or notification is therefore not mandatory, and will
be optional.
Noise Control - Comply with the following construction noise abatement measures:

(1) No construction shall be performed within 300 m of an occupied dwelling unit on Sundays, legal
holidays and between the hours of 10:00 p.m. and 6:00 a.m. on other days without the approval of the
Engineer.

(2) All equipment used shall have sound control devices no less effective than
those provided on the original equipment. No equipment shall have un-muffled exhaust.

(3) All equipment shall comply with pertinent equipment noise standards of the
U.S. Environmental Protection Agency.

(4) No pile driving or blasting operations shall be performed within 900 m of an occupied dwelling
unit on Sundays, legal holidays and between the hours of 8:00 p.m. and 8:00 a.m. on other days,
without the approval of the Engineer.

(5) The noise from rock crushing or screening operations performed within 900 m of any occupied
dwelling shall be mitigated by strategic placement of material stockpiles between the operation and
the affected dwelling or by other means approved by the Engineer.

Should a specific noise impact complaint occur during the construction of the project, one or more of
the following noise mitigations may be required at the Contractor’s expense, as directed by the
Engineer.

   Locate stationary construction equipment as far from nearby noise sensitive
    properties as possible.

   Shut off idling equipment.

   Reschedule construction operations to avoid periods of noise annoyance
    identified in the complaint.

   Notify nearby residences whenever extremely noisy work will be occurring

   Install temporary or portable acoustic barriers around stationary
    construction noise sources.

   Operate electric-powered equipment using line voltage power.


If local governments have noise ordinances which control construction noise, the construction
activities shall be in compliance with all applicable local noise ordinances.

								
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