When dealing with excavation measurements, it's important to adhere to specific safety regulations to ensure the safety of workers. Here are some key points to consider:

1. Protective Systems: For excavations deeper than 5 feet, a protective system must be used unless the excavation is in stable rock. This can include shoring, shielding, or sloping the sides of the excavation to prevent cave-ins [1].

2. Slope and Bench Requirements: Excavations 20 feet or less in depth should have a maximum allowable slope of 1.5:1 for simple slopes. For benched excavations, the maximum allowable slope is 1:1, and the maximum bench height is 4 feet [2].

3. Material Placement: Excavated materials must be kept at least 2 feet from the edge of the excavation to prevent materials from falling back into the excavation [1].

4. Water Accumulation: Ensure that excavations are kept free of water accumulation, which can undermine the stability of the excavation walls. If water is present, appropriate measures such as water removal systems should be implemented [3].

5. Access and Egress: Safe access and egress must be provided for excavations 4 feet or more in depth. This can include ladders, steps, or ramps, and they should be located within 25 feet of lateral travel for employees [4].

6. Inspections: Daily inspections by a competent person are required to check for signs of potential cave-ins, failure of protective systems, hazardous atmospheres, or other hazardous conditions. Inspections should also occur after any event that could increase hazards, such as rainstorms [1].

7. Atmospheric Testing: If there is a potential for hazardous atmospheres, such as oxygen deficiency or the presence of toxic gases, testing must be conducted before workers enter the excavation [4].

By following these guidelines, you can help ensure a safe working environment for employees involved in excavation activities.