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5.1 Hazard Communication and Overall Site Information Program The information in the JSAs and SDSs is made available to all employees and subcontractors who could be affected by it prior to the time they begin their work activities. Modifications to JSAs are communicated during routine pre-work briefings, and periodically updated as needed in the HASP. SDSs will be maintained by the SHSO/SS for new chemicals brought on-site as needed. Copies of SDSs can be found in Appendix B. 5.2 Noise Noise is associated with the operation of heavy equipment, power tools, pumps, and generators. Noise is also a potential hazard when working near operating equipment such as excavators, drill rig or pole drivers. High noise (i.e., <85 dBA)operations may be evaluated by the SHSO utilizing a type 2 handheld sound level meter (SLM) operating on the "A"-weighted scale with slow response because this scale most closely resembles human response to noise and complies with Cal/OSHA T8 CCR Group 15, Article 105 requirements. Roux requires hearing protection in areas with noise exposure greater than 85 dBA. Double hearing protection (ear plugs and earmuffs) are required in areas where the noise exposure is more than 95 dBA. Noise exposure will be controlled by hearing protection as described above or by maintaining set-backs from high-noise equipment, as warranted. Personnel handling heavy equipment and using power tools that produce noise levels exceeding those described above should don hearing protection appropriate (Noise Reduction Rating (NRR) level of hearing protection). Appropriate hearing protection will be evaluated by the SHSO as necessary in consultation with the OHSM and CHSD. 5.3 Excavations and Trenching All trenching and excavation work activities will comply with Cal/OSHA T8 CCR 1540-1541.1. Regional Notification Centers (i.e., Underground Services Alert) shall be notified at least two working days prior to the start of any digging or excavation work per Cal/OSHA T8 CCR 1541(b)(2). Personnel responsible for excavation activities will be trained per Cal/OSHA T8 CCR 1541 and Government Code Sections 4216 through 4216.9. Additionally, for trenches 4 feet or deeper, where employees will enter, the trench needs to have a stairway, ladder or other safe means of egress, and located so that employees don't have to travel farther than 25 feet horizontally. Where employees will enter trenches greater than 5 feet deep, the trench must have some type of protective system or sloped sidewalls appropriately to prevent cave-ins. In addition, a Cal/OSHA permit is required if employees enter an excavation 5 feet or more in depth per T8 CCR 341(d)(5). The SHSO or other responsible Roux personnel will be present on-Site during all Roux contracted excavation and backfill operations and will supplement health and safety monitoring conducted by Subcontractor air quality screening to ensure that appropriate levels of protection and safety procedures are utilized. The proximity of chemical, water, sewer, and electrical lines will be identified by Roux and/or their subcontractor before any subsurface activity or sampling is attempted. Prior to any excavation activities, trees, shrubbery, and other objects that can potentially pose as a hazard during excavation will be supported or removed from the excavation area. The following safe work practices will be implemented during this task. • The proximity of chemical, water, sewer, and electrical lines will be identified by a facility representative prior to beginning any subsurface activity; • At the start of every day, a competent person will inspect excavations to evaluate if the area is stable and safe to enter. Inspections will be conducted as needed throughout the excavation operations. If 3989.0001 S.104/HSP Site-Specific Health and Safety Plan I ROUX 114