Project Number:

3039

Steel Recycling Facility

SERVICE:

Noise Monitoring, Modeling and Mitigation

DESCRIPTION:

For a recycling plant in Johnston, Rhode Island, in operation for more than 40 years, the Owner asked Tech to examine the possible benefits of a noise barrier to determine if sound levels could be effectively reduced at nearby residences.

Tech's noise modeling demonstrated that a 20' barrier would effectively shield nearby residences. After reviewing Tech's analysis, the Owner began studying the technical practicality of constructing such a barrier.

To begin the noise barrier evaluation process, Tech Environmental performed a noise monitoring program. This included background measurements made at four separate locations in the residential area to the north of the existing steel recycling facility, at two separate times during one day of normal operations, and once in the evening after the conclusion of daily operational activity. In addition, on-site source measurements were made of normal operations of the existing metal shredder, and of loading operations conducted by adjacent cranes.

Subsequently, noise impacts were modeled at the adjacent receptors using a sophisticated 3-D acoustic model. Noise levels were computed using the source data collected on-site during the monitoring visit. The noise model included corrections for shielding by adjacent buildings, and differences in elevation between the plant and the nearby residences, important considerations when examining a potential noise barrier. The relatively high elevation of the shredder and cranes were also incorporated into the noise model.

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Key Points

  • A steel recycling facility wanted to study the potential for reducing noise impacts at nearby residences.
  • Tech collected noise data and used the CadnaA acoustic model to determine effective noise mitigation options.