Noise Assessment - Tamsin Ridge Solar and Storage Project

C-fd52f76b29 · Page 3 of 3 · DR-0016 · 2023-07-10

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Blasting is not expected.

Quoted from page 3

Blasting is not expected;

Source consultant_memo · Claim type absence · Polarity absence · Confidence high · Quote check exact, 100 of 100

Cited by EN-02 Geotechnical and Soils, CO-03 Noise · Filed under CO-03, EN-02

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Noise Assessment - Tamsin Ridge Solar and Storage Project Construction noise and vibration Pile driving is the loudest construction activity, at 85 to 95 dBA at 100 feet. The nearest non-participating residence is 260 feet from the array fence (R-2), where pile driving would reach about 80 to 87 dBA for several days. Blasting is not expected; pre-drilling where piles meet refusal is quieter than driving. Recommended controls: pile driving and other loud work only from 7:00 a.m. to 7:00 p.m., Monday to Saturday; notice to residences within 1,000 feet a week before pile driving nearby; a complaint line; vibration monitoring within 200 feet of any residence or well. Recommendations • Select and model a mitigation for the BESS yard and substation that brings R-6 and R-7 to the design goal by day and by night before the OPSB application is filed. • Specify a main power transformer with reduced sound power, or an enclosure, to remove the prominent tone at R-7. • Repeat background measurements in winter, when leaf cover and insect noise are absent, if OPSB staff ask for seasonal data. Signe Dalby, INCE Bd. Cert., Senior Acoustician, Halvard Acoustics, LLC. Halvard Acoustics, LLC - Report HA-23-061 Page 3 of 3

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Page 3 of Noise Assessment - Tamsin Ridge Solar and Storage Project

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Pile driving would reach about 80 to 87 dBA for several days at the nearest non-participating residence, 260 feet from the array fence (R-2).
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Recommended construction controls: loud work 7 a.m. to 7 p.m. Monday to Saturday, notice, complaint line, and vibration monitoring within 200 feet of residences or wells.