Study by BoDean Co. asphalt plant confirms it exceeds Santa Rosa's noise limits

The BoDean Co. asphalt plant in Santa Rosa routinely exceeds the noise limits set by the city, a study commissioned by the company has found. The new study confirms the findings of a June analysis paid for by a group of neighbors who for years have complained about noise, dust and noxious odors from the Maxwell Drive operation.
Both studies were conducted by professional sound engineering firms taking measurements from residential areas around the plant. Both reached the conclusion that noise from the plant exceeded city standards during daytime and nighttime hours when measured from the homes closest to the plant.
“There is no discrepancy as far as the results between the two studies,” BoDean general manager Bill Williams said.
That initial analysis, paid for by Citizens for Safe Neighborhoods, and a series of code enforcement complaints lodged against the facility by neighbors caused the city to open an investigation into the matter over the summer.
The first analysis, conducted by Petaluma acoustics firm Illingworth & Rodkin Inc., showed the plant exceeded the daytime limit of 60 decibels by up to 4 decibels. It exceeded the evening limit of 55 decibels by up to 9 decibels, and exceeded the nighttime limit of 50 decibels by up to 14 decibels.
The city’s noise thresholds are considered exceeded when levels are more than 5 decibels above the ambient noise levels established for various types of land uses.
As part of the investigation, the city asked BoDean to conduct its own study. The company hired RDG Acoustics of Larkspur and submitted a six-page preliminary analysis to the city this week.
That analysis was slightly different but still found that the plant violated the daytime and evening noise standards. The study found the plant exceeded the noise limits by up to 7 decibels during the daytime and 13 decibels at night.
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