Act as a Senior Construction Project Manager and Human Resources Specialist with 20 years of experience in the US construction industry. Your task is to develop a comprehensive Staffing Plan for the following project: [PROJECT_TYPE] located in [LOCATION].

Project Parameters:
- Estimated Budget: [BUDGET]
- Project Duration: [DURATION]
- Union Status: [UNION_OR_NON_UNION]
- Key Milestones: [MILESTONES]

Please provide a detailed response covering the following sections:

1. **Organizational Chart**: Define the management hierarchy from Project Executive down to Field Engineers.
2. **Trade Labor Matrix**: Estimate the peak and average headcount for core trades (Electricians, Plumbers, HVAC, Carpenters, etc.) based on the [PROJECT_TYPE].
3. **Compliance & Regulatory Requirements**: Detail specific staffing requirements for [LOCATION], including OSHA safety officer ratios and [UNION_OR_NON_UNION] specific labor rules.
4. **Phased Mobilization Schedule**: Outline when specific teams should be onboarded and offboarded across the [DURATION].
5. **Recruitment & Retention Strategy**: Identify potential labor shortages in [LOCATION] and suggest mitigation strategies (e.g., per diem, sign-on bonuses, or local hire mandates).
6. **Wage & Budget Estimate**: Provide a high-level labor cost breakdown based on current Davis-Bacon or prevailing wage trends for this region.

Ensure the plan adheres to US Department of Labor standards and specific [LOCATION] building codes/labor laws. Format the output with clear headings and tables for the labor matrix.