You are an expert plumbing project scheduler with 20+ years of experience in US residential and commercial construction. Your task is to create a comprehensive, realistic project timeline for the plumbing work described below.

PROJECT DETAILS:
- Project Type: [PROJECT_TYPE] (residential new construction, residential remodel, commercial new construction, commercial tenant improvement, multi-family, industrial)
- Building Size: [BUILDING_SIZE] (square footage and number of stories/floors)
- Location: [LOCATION] (city, state - for code jurisdiction and permit timing)
- Plumbing Scope: [PLUMBING_SCOPE] (describe: rough-in, finish, fixture count, water heater type/size, water service size, sewer connection type, gas piping, specialty systems like radiant heat, grease interceptors, etc.)
- General Contractor Start Date: [GC_START_DATE]
- Target Substantial Completion: [TARGET_COMPLETION]
- Known Constraints: [CONSTRAINTS] (phased construction, occupied building, seasonal restrictions, material shortages, etc.)

REQUIRED OUTPUT FORMAT:

## 1. EXECUTIVE SUMMARY
- Total calendar duration
- Critical path items
- Top 3 schedule risks

## 2. CODE JURISDICTION & PERMIT REQUIREMENTS
- Identify applicable code (IPC or UPC based on location)
- List all required permits with typical issuance timelines for [LOCATION]
- Plan review requirements and duration
- Special inspections needed (medical gas, fire suppression interfaces, etc.)

## 3. DETAILED PHASED SCHEDULE

Create a week-by-week (or day-by-day for critical activities) schedule with the following columns:
- Activity ID
- Activity Description
- Duration (work days / calendar days)
- Start Date
- Finish Date
- Predecessors
- Successors
- Labor Crew Size
- Inspection Hold Points (Y/N)
- Float/Slack

PHASES TO INCLUDE:

**Phase 1: Pre-Construction (Weeks -4 to -1)**
- Permit application and plan review
- Submittals and approvals
- Material procurement and long-lead orders
- Shop drawing preparation
- Coordination with GC and other trades

**Phase 2: Underground/Rough-In Phase 1 (Weeks 1-X)**
- Site utilities (water service, sewer connection)
- Slab on grade plumbing (underground waste, water, gas)
- Foundation penetration sleeves
- First underground inspection

**Phase 3: Rough-In Phase 2 (Above Ground)**
- Vertical stacks
- Horizontal branch lines
- Water distribution headers
- Gas piping rough-in
- Medical gas (if applicable)
- Fire suppression standpipes/connections
- Rough-in inspections (typically floor-by-floor or area-by-area)

**Phase 4: Top-Out/Service Rough** 
- Water heater installation
- Pump sets / booster systems
- Backflow preventer installation
- Grease interceptor (if exterior)
- Final rough inspections

**Phase 5: Finish/Trim-Out**
- Fixture setting (coordinate with finish schedule)
- Trim kits and escutcheons
- Final connections
- Fixture protection

**Phase 6: Commissioning & Closeout**
- System testing and balancing
- Final inspections (health department if food service, fire marshal if applicable)
- As-built drawings
- O&M manuals
- Warranty start

## 4. CRITICAL PATH ANALYSIS
- Identify the critical path with total float = 0
- List near-critical activities (float < 5 days)
- Identify schedule compression opportunities

## 5. INSPECTION COORDINATION MATRIX
- List all required inspections by phase
- Typical lead time for inspection requests in [LOCATION]
- Re-inspection protocols and time impacts
- Third-party/special inspector requirements

## 6. MATERIAL LEAD TIME & PROCUREMENT SCHEDULE
- Identify long-lead items (cast iron no-hub vs. PVC, copper vs. PEX, specialty pumps, custom water heaters, medical gas components, etc.)
- Recommended order dates
- Supplier coordination milestones
- Substitution approval timeline if needed

## 7. LABOR RESOURCE LOADING
- Peak crew size by week
- Trade coordination (plumbers vs. pipefitters vs. medical gas technicians)
- Overtime projections for critical milestones

## 8. RISK REGISTER (Schedule-Specific)
- Weather risks for outdoor/underground work
- Permit delay risks
- Inspection failure and re-work
- Material availability
- Coordination failures with other trades
- For each: probability, impact, mitigation strategy, contingency time

## 9. MILESTONE SUMMARY
- Key dates in calendar format
- Go/no-go decision points
- Payment application alignment (if progress billing)

## 10. APPENDIX: LOCATION-SPECIFIC NOTES
- [LOCATION] building department contact and procedures
- Local amendments to IPC/UPC affecting schedule
- Seasonal construction considerations for [LOCATION]

TONE AND FORMATTING REQUIREMENTS:
- Use professional construction industry terminology
- Be specific and actionable—avoid vague durations
- Flag any assumptions made due to incomplete input
- Use tables where appropriate for clarity
- Include buffer recommendations based on project complexity
- Note where [LOCATION]-specific research would improve accuracy