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Kennedy/Jenks Consultants If concentrations are less than 19.5 percent, withdraw from area until a breathable atmosphere has been re-established. If concentrations are between 19.5 and 23.5 percent, continue investigation and monitoring. If concentrations are greater than 23.5 percent, withdraw from area immediately (fire hazard potential). 7.3.4 Noise Field personnel will initially monitor noise levels associated with equipment and machinery with a direct reading portable noise level monitor unless based on experience, it is known that hearing protection is not necessary. Readings will be taken within the normal worker hearing zone. If maximum noise levels exceed 85 decibels at any time during site operations, hearing protection will be worn. The OSHA permissible noise exposure limit is 90 decibels as an average exposure over an 8-hour work period. If an employee's 8-hour time-weighted average noise exposure for any day is in excess of 85 decibels, the employee must participate in a hearing conservation program. For most field activities, it is unlikely the employee exposure in excess of 85 decibels for 8 hours will occur. Although a written hearing conservation program is not required, Kenney/Jenks Consultants will provide field personnel with appropriate hearing protection (i.e., earmuffs or plugs) whenever noise levels have the potential to exceed 85 decibels. All contractors are responsible to ensure whether a hearing conservation program is warranted per site conditions and are to ensure compliance with applicable OSHA regulations. 7.4 Site Control Work zones will not be established for Level D activities. Individuals not directly involved in ongoing work will be requested to stay at least 50 feet away from Level D activities. For work inside a building, access will be controlled using building access control. 7.5 Decontamination For activities requiring Level D protection and modified Level C protection without established work zones, it is unlikely major decontamination will be necessary. At the conclusion of each day or work period, disposable gloves and coveralls will be removed and disposed of in onsite containers. If full Level C protection is required, minimum decontamination procedures associated with Level C protection will be followed and established within the Contamination Reduction Zone. These procedures are presented in Table 4. BNSF Mormon Yard - Soil Sampling Site-Specific Health and Safety Plan Mormon Yard, Stockton, California © 2016 Kennedy/Jenks Consultants Page 18 Ilsfocad projectskis-proj1201311365020.01_bnsf stockton work plan12016 hrsc work planlappendiceslappendixb_hasp12016_hasp_2015content_final.docx