Workplace noise contouring and ISO 11690-aligned hearing conservation
Comprehensive noise surveys produce contour maps that identify high-exposure zones and source contributions. Coupled with audiometric programmes, engineering controls, and administrative measures, we deliver hearing conservation programmes that prevent noise-induced hearing loss.
A practical, phased delivery approach — from gap assessment through operational embedding — built around your regulatory context.
Conduct facility noise survey per ISO 9612 / NIOSH 1998 — sound level measurement (Type 1 sound level meter), octave-band analysis, dosimetry; identify dominant noise sources (rotating equipment, valves, blowers, vents).
Build noise contour map per ISO 9613-2 / SoundPLAN / IMMI — A-weighted Leq levels with 1-3 dB(A) resolution; identify exposure zones per OSHA / EU NDWD — <80 dB(A) safe, 80-85 dB(A) action, >85 dB(A) HCP required.
Conduct personal dosimetry per ISO 9612 / OSHA 1910.95 Appendix A — Type 2 dosimeter (or Type 1 noise dosimeter), 8-hour TWA calculation per AIHA / OSHA exchange rate (3 dB ISO / 5 dB OSHA / NIOSH).
Specify engineering noise control per ISO 11690 hierarchy — source treatment (enclosure, silencer, vibration isolation), path treatment (absorption, barriers), receiver treatment (control room, refuge); align with NIOSH Buy Quiet.
Design HCP per OSHA 1910.95 / EU NDWD / HSE Control of Noise — audiometric baseline + annual testing, hearing protection (NRR / SNR-rated), training, signage, audiometric record retention (per OSHA — duration of employment + 30 years).
Monitor for Standard Threshold Shift (STS) per OSHA — 10 dB average shift at 2-4 kHz; manage STS with re-test, HPD review, work area re-assignment; align with OSHA recordable injury (29 CFR 1904.10) and workers' compensation.
Speak with our team to scope an engagement tailored to your facility, regulatory context, and lifecycle stage.