To determine if Dave has enough experience to be a competent person for excavation, it's important to understand the definition of a "competent person" in the context of excavation safety. A competent person is someone who is capable of identifying existing and predictable hazards in the surroundings, or working conditions which are unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate them 1, 2.

To assess Dave's competency, consider the following:

1. Hazard Identification: Can Dave accurately identify potential hazards related to excavation, such as cave-ins 1, 2, hazardous atmospheres 4, 6, water accumulation 3, 6, falling loads, and unstable adjacent structures 3, 16?
2. Corrective Measures: Does Dave have the authority and knowledge to take prompt corrective measures to eliminate identified hazards 1, 2? This includes implementing appropriate protective systems 5, 9, ensuring proper shoring and bracing 3, 16, managing water accumulation 3, 6, and providing adequate ventilation 3, 6.
3. Inspection Skills: Is Dave capable of conducting daily inspections of excavations, adjacent areas, and protective systems for any evidence of potential cave-ins, failure of protective systems, hazardous atmospheres, or other hazardous conditions 4, 10?
4. Knowledge of Regulations: Does Dave have a thorough understanding of the relevant safety regulations and standards, such as those outlined in OSHA's Subpart P - Excavations [1]?

If Dave demonstrates these capabilities, he may be considered a competent person. If there are any doubts about Dave's competency, it may be necessary to provide him with additional training or supervision to ensure he can effectively fulfill the responsibilities of a competent person.