- Acoustical study
- Solar development
- Ambient monitoring
- Regulatory analysis
GZA was engaged to conduct a comprehensive noise study, including ambient monitoring, acoustic modeling, and regulatory analysis for a proposed solar development in Suffolk, VA.
Challenge
Suffolk, VA’s noise ordinance requires solar facilities to keep noise levels below 45 dB(A) at residential property lines within 500 feet of any equipment, with additional penalties applied for tonal or impulsive noise sources. Because the project site is bordered by multiple homes, it was essential to assess potential noise impacts—particularly at night when ambient sound is lowest. Addressing concerns from nearby residents and other stakeholders about possible noise increases was critical for securing project approval and ensuring long term community support.
Solution
GZA performed 24 hour ambient noise monitoring to establish baseline sound levels under a range of environmental conditions. Using CadnaA software, the team modeled noise emissions from all major onsite equipment at each sensitive receptor location. Because the transformer noise was classified as tonal, the strict 45 dB(A) criterion applied. Modeled sound levels at all property lines fell between 18 and 28 dB(A), well below regulatory limits. The analysis confirmed that projected noise levels at nearby residences would remain significantly under the most stringent thresholds.
Benefit
GZA’s expertise and thorough analysis proved the solar facility could operate within all local noise ordinances, minimizing risk and streamlining the permitting process.