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KLE/NFELOER (�H e a l t h& Safety Procedure HSP-5-07 Version 10 NOISE AND HEARING Number: Number: PROTECTION Published 5/4/2018 Revised N/A Date: Date: Range of Levels Communication Environment 30 to 40 dBA Very quiet office—telephone use satisfactory— suitable for large conferences. 40 to 45 dBA Quiet office, satisfactory for conferences at a one 5-ft table; normal voice 10 to 30 ft.; telephone use satisfactory. 45 to 50 dBA Satisfactory for conferences at a 6 to 8 ft. table; telephone use satisfactory; normal voice 6 to 12 ft. 50 to 60 dBA Satisfactory for conferences at a 4 to 5 ft. table; telephone use occasionally slightly difficult; normal voice 3 to 6 ft.; raised voice to 6 to 12 ft. 60 to 65 dBA Unsatisfactory for conferences of more than two or three people; telephone use slightly difficult; normal voice 1 to 2 ft.; raised voice 3 to 6 ft. Above 65 dBA , very noisy; office environment unsatisfactory; telephone use difficult. Table 3. Noise Levels for Offices 5-07.7 HEARING CONSERVATION PROGRAM 5-07.7.1 Evaluation of Noise Hazards The hazard potential of a given noise exposure depends on the intensity, and duration of exposure. Each of these factors must be considered in determining which exposures are hazardous. To evaluate the hazard from a noise exposure, the Health and Safety Manager should be contacted through your ASR or Site Safety Officer. A simple rule to guide project managers in deciding whether a noise survey is necessary is to estimate the noise level. The noise level can be estimated as being above acceptable levels if normal conversation is difficult at a distance of 3 feet. If conversation is difficult and the employee has an appreciable duration of exposure, then a noise survey is necessary. For general guideline, see Table 4. All exposure monitoring measurements shall be documented and maintained by the Health and Safety Manager. Monitoring/exposure results shall be posted for review by affected employees. All documentation shall be maintained in the specific project file or field notebook, and maintained for a period of not less than 2 years. Copyright 2019 Kleinfelder, Inc. Page 5 of 9 Important: When modifying this document, update properties with your name, date, and nature of changes made.