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• 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 deemed necessary, a competent person may also conduct inspections after rainfall or any other event that can potentially affect the integrity of the excavation. Employees will not enter excavations where water has accumulated until protective measures have been implemented. • Prior to entering excavations greater than 4 feet in depth, air monitoring for oxygen and hazardous atmospheres must be conducted to assure atmospheric conditions are within normal levels described in Section 8.6.1. Continuous air monitoring with a standard multi-gas detector(02, LEL%, CO, H2S) shall be used during the course of work within an excavation; if action limits are reached workers shall safely exit the excavation. Upgrades to worker protection should be evaluated with the SHSO and PP in consultation with the CHSD. Emergency rescue equipment, such as breathing apparatuses and safety harnesses connected to an extraction device, will be readily available in the event of hazardous atmospheric conditions; • While earthmoving,stay out of the excavator's delineated heavy equipment exclusion zone and away from the excavation sides where there is potential for cave in (within excavations that are 6 feet or more in depth, a delineated perimeter 6 feet away from the excavated edge is required); • During loading and unloading operations, stand away from haul trucks and other vehicles to avoid contact with any falling loads; and • Traffic cones, caution tape, or other barriers will be set up around the perimeter of the excavation when employees are working along the excavation edge and for any excavation that will be left open overnight or unattended for more than two days. Maximum Allowable Slopes Soil or Rock Type Maximum Allowable Slopes (H:V)l for Excavations Less Than 20 Feet Deep' Stable Rock Vertical (g0°) Type A 3/4 : 1 (53°) Type B 1 : 1 (45°) Type C 1 1/2 : 1 (34°) Cal/OSHAT8 CCR 1541.1 Table B-1 Notes: Numbers shown in parentheses next to maximum allowable slopes are angles expressed in degrees from the horizontal. Angles have been rounded off. 2 A short-term maximum allowable slope Of /2H: 1V(63°)is allowed in excavations in Type A soil that are 12 feet(3.67 meters)or less in depth. Short-term maximum allowable slopes for excavations greater than 12 feet(3.67 meters)in depth shall be s/4H : 1 V (53°). s Sloping or benching for excavations greater than 20 feet deep shall be designed and stamped by a registered professional engineer. Proper stockpiling (i.e., 2 feet minimum distance from the excavation edge), containment, transport, storage, and disposal practices will be utilized and is dependent upon the potential type and amount of waste generated during operations. The location of safety equipment and evacuation procedures will be established prior to initiation of operations according to this HASP. 5175.0001S102/HSP Site-Specific Health and Safety Plan I ROUX 114