diff --git a/backend/routers/projects.py b/backend/routers/projects.py
index f748d6e..ea5dc5d 100644
--- a/backend/routers/projects.py
+++ b/backend/routers/projects.py
@@ -10,7 +10,7 @@ Provides API endpoints for the Projects system:
 
 from fastapi import APIRouter, Request, Depends, HTTPException, Query
 from fastapi.templating import Jinja2Templates
-from fastapi.responses import HTMLResponse, JSONResponse
+from fastapi.responses import HTMLResponse, JSONResponse, StreamingResponse
 from sqlalchemy.orm import Session
 from sqlalchemy import func, and_
 from datetime import datetime, timedelta
@@ -18,6 +18,7 @@ from typing import Optional
 import uuid
 import json
 import logging
+import io
 
 from backend.database import get_db
 from backend.models import (
@@ -1025,6 +1026,147 @@ async def download_project_file(
     )
 
 
+@router.get("/{project_id}/sessions/{session_id}/download-all")
+async def download_session_files(
+    project_id: str,
+    session_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Download all files from a session as a single zip archive.
+    """
+    from backend.models import DataFile
+    from pathlib import Path
+    import zipfile
+
+    # Verify session belongs to this project
+    session = db.query(RecordingSession).filter_by(id=session_id).first()
+    if not session:
+        raise HTTPException(status_code=404, detail="Session not found")
+    if session.project_id != project_id:
+        raise HTTPException(status_code=403, detail="Session does not belong to this project")
+
+    # Get all files for this session
+    files = db.query(DataFile).filter_by(session_id=session_id).all()
+    if not files:
+        raise HTTPException(status_code=404, detail="No files found in this session")
+
+    # Create zip in memory
+    zip_buffer = io.BytesIO()
+
+    # Get session info for folder naming
+    session_date = session.started_at.strftime('%Y-%m-%d_%H%M') if session.started_at else 'unknown'
+
+    # Get unit and location for naming
+    unit = db.query(RosterUnit).filter_by(id=session.unit_id).first() if session.unit_id else None
+    location = db.query(MonitoringLocation).filter_by(id=session.location_id).first() if session.location_id else None
+
+    unit_name = unit.id if unit else "unknown_unit"
+    location_name = location.name.replace(" ", "_") if location else ""
+
+    # Build folder name for zip contents
+    folder_name = f"{session_date}_{unit_name}"
+    if location_name:
+        folder_name += f"_{location_name}"
+
+    with zipfile.ZipFile(zip_buffer, 'w', zipfile.ZIP_DEFLATED) as zip_file:
+        for file_record in files:
+            file_path = Path("data") / file_record.file_path
+            if file_path.exists():
+                # Add file to zip with folder structure
+                arcname = f"{folder_name}/{file_path.name}"
+                zip_file.write(file_path, arcname)
+
+    zip_buffer.seek(0)
+
+    # Generate filename for the zip
+    zip_filename = f"{folder_name}.zip"
+
+    return StreamingResponse(
+        zip_buffer,
+        media_type="application/zip",
+        headers={"Content-Disposition": f"attachment; filename={zip_filename}"}
+    )
+
+
+@router.delete("/{project_id}/files/{file_id}")
+async def delete_project_file(
+    project_id: str,
+    file_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Delete a single data file from a project.
+    Removes both the database record and the file on disk.
+    """
+    from backend.models import DataFile
+    from pathlib import Path
+
+    # Get the file record
+    file_record = db.query(DataFile).filter_by(id=file_id).first()
+    if not file_record:
+        raise HTTPException(status_code=404, detail="File not found")
+
+    # Verify file belongs to this project
+    session = db.query(RecordingSession).filter_by(id=file_record.session_id).first()
+    if not session or session.project_id != project_id:
+        raise HTTPException(status_code=403, detail="File does not belong to this project")
+
+    # Delete file from disk if it exists
+    file_path = Path("data") / file_record.file_path
+    if file_path.exists():
+        file_path.unlink()
+
+    # Delete database record
+    db.delete(file_record)
+    db.commit()
+
+    return JSONResponse({"status": "success", "message": "File deleted"})
+
+
+@router.delete("/{project_id}/sessions/{session_id}")
+async def delete_session(
+    project_id: str,
+    session_id: str,
+    db: Session = Depends(get_db),
+):
+    """
+    Delete an entire session and all its files.
+    Removes database records and files on disk.
+    """
+    from backend.models import DataFile
+    from pathlib import Path
+
+    # Verify session belongs to this project
+    session = db.query(RecordingSession).filter_by(id=session_id).first()
+    if not session:
+        raise HTTPException(status_code=404, detail="Session not found")
+    if session.project_id != project_id:
+        raise HTTPException(status_code=403, detail="Session does not belong to this project")
+
+    # Get all files for this session
+    files = db.query(DataFile).filter_by(session_id=session_id).all()
+
+    # Delete files from disk
+    deleted_count = 0
+    for file_record in files:
+        file_path = Path("data") / file_record.file_path
+        if file_path.exists():
+            file_path.unlink()
+            deleted_count += 1
+        # Delete database record
+        db.delete(file_record)
+
+    # Delete the session record
+    db.delete(session)
+    db.commit()
+
+    return JSONResponse({
+        "status": "success",
+        "message": f"Session and {deleted_count} file(s) deleted"
+    })
+
+
 @router.get("/{project_id}/files/{file_id}/view-rnd", response_class=HTMLResponse)
 async def view_rnd_file(
     request: Request,
@@ -1195,6 +1337,586 @@ async def get_rnd_data(
         raise HTTPException(status_code=500, detail=f"Error parsing file: {str(e)}")
 
 
+@router.get("/{project_id}/files/{file_id}/generate-report")
+async def generate_excel_report(
+    project_id: str,
+    file_id: str,
+    report_title: str = Query("Background Noise Study", description="Title for the report"),
+    location_name: str = Query("", description="Location name (e.g., 'NRL 1 - West Side')"),
+    db: Session = Depends(get_db),
+):
+    """
+    Generate an Excel report from an RND file.
+
+    Creates a formatted Excel workbook with:
+    - Title and location headers
+    - Data table (Test #, Date, Time, LAmax, LA01, LA10, Comments)
+    - Line chart visualization
+    - Time period summary statistics
+
+    Column mapping from RND to Report:
+    - Lmax(Main) -> LAmax (dBA)
+    - LN1(Main) -> LA01 (dBA)  [L1 percentile]
+    - LN2(Main) -> LA10 (dBA)  [L10 percentile]
+    """
+    from backend.models import DataFile
+    from pathlib import Path
+    import csv
+
+    try:
+        import openpyxl
+        from openpyxl.chart import LineChart, Reference
+        from openpyxl.chart.label import DataLabelList
+        from openpyxl.styles import Font, Alignment, Border, Side, PatternFill
+        from openpyxl.utils import get_column_letter
+    except ImportError:
+        raise HTTPException(
+            status_code=500,
+            detail="openpyxl is not installed. Run: pip install openpyxl"
+        )
+
+    # Get the file record
+    file_record = db.query(DataFile).filter_by(id=file_id).first()
+    if not file_record:
+        raise HTTPException(status_code=404, detail="File not found")
+
+    # Verify file belongs to this project
+    session = db.query(RecordingSession).filter_by(id=file_record.session_id).first()
+    if not session or session.project_id != project_id:
+        raise HTTPException(status_code=403, detail="File does not belong to this project")
+
+    # Get related data for report context
+    project = db.query(Project).filter_by(id=project_id).first()
+    location = db.query(MonitoringLocation).filter_by(id=session.location_id).first() if session.location_id else None
+
+    # Build full file path
+    file_path = Path("data") / file_record.file_path
+    if not file_path.exists():
+        raise HTTPException(status_code=404, detail="File not found on disk")
+
+    # Validate this is a Leq file (contains '_Leq_' in path)
+    # Lp files (instantaneous 100ms readings) don't have the LN percentile data needed for reports
+    if '_Leq_' not in file_record.file_path:
+        raise HTTPException(
+            status_code=400,
+            detail="Reports can only be generated from Leq files (15-minute averaged data). This appears to be an Lp (instantaneous) file."
+        )
+
+    # Read and parse the Leq RND file
+    try:
+        with open(file_path, 'r', encoding='utf-8', errors='replace') as f:
+            content = f.read()
+
+        reader = csv.DictReader(io.StringIO(content))
+        rnd_rows = []
+        for row in reader:
+            cleaned_row = {}
+            for key, value in row.items():
+                if key:
+                    cleaned_key = key.strip()
+                    cleaned_value = value.strip() if value else ''
+                    if cleaned_value and cleaned_value not in ['-.-', '-', '']:
+                        try:
+                            cleaned_value = float(cleaned_value)
+                        except ValueError:
+                            pass
+                    elif cleaned_value in ['-.-', '-']:
+                        cleaned_value = None
+                    cleaned_row[cleaned_key] = cleaned_value
+            rnd_rows.append(cleaned_row)
+
+        if not rnd_rows:
+            raise HTTPException(status_code=400, detail="No data found in RND file")
+
+    except Exception as e:
+        logger.error(f"Error reading RND file: {e}")
+        raise HTTPException(status_code=500, detail=f"Error reading file: {str(e)}")
+
+    # Create Excel workbook
+    wb = openpyxl.Workbook()
+    ws = wb.active
+    ws.title = "Sound Level Data"
+
+    # Define styles
+    title_font = Font(bold=True, size=14)
+    header_font = Font(bold=True, size=10)
+    thin_border = Border(
+        left=Side(style='thin'),
+        right=Side(style='thin'),
+        top=Side(style='thin'),
+        bottom=Side(style='thin')
+    )
+    header_fill = PatternFill(start_color="DAEEF3", end_color="DAEEF3", fill_type="solid")
+
+    # Row 1: Report title
+    final_title = report_title
+    if project:
+        final_title = f"{report_title} - {project.name}"
+    ws['A1'] = final_title
+    ws['A1'].font = title_font
+    ws.merge_cells('A1:G1')
+
+    # Row 3: Location name
+    final_location = location_name
+    if not final_location and location:
+        final_location = location.name
+    if final_location:
+        ws['A3'] = final_location
+        ws['A3'].font = Font(bold=True, size=11)
+
+    # Row 7: Headers
+    headers = ['Test Increment #', 'Date', 'Time', 'LAmax (dBA)', 'LA01 (dBA)', 'LA10 (dBA)', 'Comments']
+    for col, header in enumerate(headers, 1):
+        cell = ws.cell(row=7, column=col, value=header)
+        cell.font = header_font
+        cell.border = thin_border
+        cell.fill = header_fill
+        cell.alignment = Alignment(horizontal='center')
+
+    # Set column widths
+    column_widths = [16, 12, 10, 12, 12, 12, 40]
+    for i, width in enumerate(column_widths, 1):
+        ws.column_dimensions[get_column_letter(i)].width = width
+
+    # Data rows starting at row 8
+    data_start_row = 8
+    for idx, row in enumerate(rnd_rows, 1):
+        data_row = data_start_row + idx - 1
+
+        # Test Increment #
+        ws.cell(row=data_row, column=1, value=idx).border = thin_border
+
+        # Parse the Start Time to get Date and Time
+        start_time_str = row.get('Start Time', '')
+        if start_time_str:
+            try:
+                # Format: "2025/12/26 20:23:38"
+                dt = datetime.strptime(start_time_str, '%Y/%m/%d %H:%M:%S')
+                ws.cell(row=data_row, column=2, value=dt.date())
+                ws.cell(row=data_row, column=3, value=dt.time())
+            except ValueError:
+                ws.cell(row=data_row, column=2, value=start_time_str)
+                ws.cell(row=data_row, column=3, value='')
+        else:
+            ws.cell(row=data_row, column=2, value='')
+            ws.cell(row=data_row, column=3, value='')
+
+        # LAmax - from Lmax(Main)
+        lmax = row.get('Lmax(Main)')
+        ws.cell(row=data_row, column=4, value=lmax if lmax else '').border = thin_border
+
+        # LA01 - from LN1(Main)
+        ln1 = row.get('LN1(Main)')
+        ws.cell(row=data_row, column=5, value=ln1 if ln1 else '').border = thin_border
+
+        # LA10 - from LN2(Main)
+        ln2 = row.get('LN2(Main)')
+        ws.cell(row=data_row, column=6, value=ln2 if ln2 else '').border = thin_border
+
+        # Comments (empty for now, can be populated)
+        ws.cell(row=data_row, column=7, value='').border = thin_border
+
+        # Apply borders to date/time cells
+        ws.cell(row=data_row, column=2).border = thin_border
+        ws.cell(row=data_row, column=3).border = thin_border
+
+    data_end_row = data_start_row + len(rnd_rows) - 1
+
+    # Add Line Chart
+    chart = LineChart()
+    chart.title = f"{final_location or 'Sound Level Data'} - Background Noise Study"
+    chart.style = 10
+    chart.y_axis.title = "Sound Level (dBA)"
+    chart.x_axis.title = "Test Increment"
+    chart.height = 12
+    chart.width = 20
+
+    # Data references (LAmax, LA01, LA10 are columns D, E, F)
+    data_ref = Reference(ws, min_col=4, min_row=7, max_col=6, max_row=data_end_row)
+    categories = Reference(ws, min_col=1, min_row=data_start_row, max_row=data_end_row)
+
+    chart.add_data(data_ref, titles_from_data=True)
+    chart.set_categories(categories)
+
+    # Style the series
+    if len(chart.series) >= 3:
+        chart.series[0].graphicalProperties.line.solidFill = "FF0000"  # LAmax - Red
+        chart.series[1].graphicalProperties.line.solidFill = "00B050"  # LA01 - Green
+        chart.series[2].graphicalProperties.line.solidFill = "0070C0"  # LA10 - Blue
+
+    # Position chart to the right of data
+    ws.add_chart(chart, "I3")
+
+    # Add summary statistics section below the data
+    summary_row = data_end_row + 3
+    ws.cell(row=summary_row, column=1, value="Summary Statistics").font = Font(bold=True, size=12)
+
+    # Calculate time-period statistics
+    time_periods = {
+        'Evening (7PM-10PM)': [],
+        'Nighttime (10PM-7AM)': [],
+        'Morning (7AM-12PM)': [],
+        'Daytime (12PM-7PM)': []
+    }
+
+    for row in rnd_rows:
+        start_time_str = row.get('Start Time', '')
+        if start_time_str:
+            try:
+                dt = datetime.strptime(start_time_str, '%Y/%m/%d %H:%M:%S')
+                hour = dt.hour
+
+                lmax = row.get('Lmax(Main)')
+                ln1 = row.get('LN1(Main)')
+                ln2 = row.get('LN2(Main)')
+
+                if isinstance(lmax, (int, float)) and isinstance(ln1, (int, float)) and isinstance(ln2, (int, float)):
+                    data_point = {'lmax': lmax, 'ln1': ln1, 'ln2': ln2}
+
+                    if 19 <= hour < 22:
+                        time_periods['Evening (7PM-10PM)'].append(data_point)
+                    elif hour >= 22 or hour < 7:
+                        time_periods['Nighttime (10PM-7AM)'].append(data_point)
+                    elif 7 <= hour < 12:
+                        time_periods['Morning (7AM-12PM)'].append(data_point)
+                    else:  # 12-19
+                        time_periods['Daytime (12PM-7PM)'].append(data_point)
+            except ValueError:
+                continue
+
+    # Summary table headers
+    summary_row += 2
+    summary_headers = ['Time Period', 'Samples', 'LAmax Avg', 'LA01 Avg', 'LA10 Avg']
+    for col, header in enumerate(summary_headers, 1):
+        cell = ws.cell(row=summary_row, column=col, value=header)
+        cell.font = header_font
+        cell.fill = header_fill
+        cell.border = thin_border
+
+    # Summary data
+    summary_row += 1
+    for period_name, samples in time_periods.items():
+        ws.cell(row=summary_row, column=1, value=period_name).border = thin_border
+        ws.cell(row=summary_row, column=2, value=len(samples)).border = thin_border
+
+        if samples:
+            avg_lmax = sum(s['lmax'] for s in samples) / len(samples)
+            avg_ln1 = sum(s['ln1'] for s in samples) / len(samples)
+            avg_ln2 = sum(s['ln2'] for s in samples) / len(samples)
+            ws.cell(row=summary_row, column=3, value=round(avg_lmax, 1)).border = thin_border
+            ws.cell(row=summary_row, column=4, value=round(avg_ln1, 1)).border = thin_border
+            ws.cell(row=summary_row, column=5, value=round(avg_ln2, 1)).border = thin_border
+        else:
+            ws.cell(row=summary_row, column=3, value='-').border = thin_border
+            ws.cell(row=summary_row, column=4, value='-').border = thin_border
+            ws.cell(row=summary_row, column=5, value='-').border = thin_border
+
+        summary_row += 1
+
+    # Overall summary
+    summary_row += 1
+    ws.cell(row=summary_row, column=1, value='Overall').font = Font(bold=True)
+    ws.cell(row=summary_row, column=1).border = thin_border
+    ws.cell(row=summary_row, column=2, value=len(rnd_rows)).border = thin_border
+
+    all_lmax = [r.get('Lmax(Main)') for r in rnd_rows if isinstance(r.get('Lmax(Main)'), (int, float))]
+    all_ln1 = [r.get('LN1(Main)') for r in rnd_rows if isinstance(r.get('LN1(Main)'), (int, float))]
+    all_ln2 = [r.get('LN2(Main)') for r in rnd_rows if isinstance(r.get('LN2(Main)'), (int, float))]
+
+    if all_lmax:
+        ws.cell(row=summary_row, column=3, value=round(sum(all_lmax) / len(all_lmax), 1)).border = thin_border
+    if all_ln1:
+        ws.cell(row=summary_row, column=4, value=round(sum(all_ln1) / len(all_ln1), 1)).border = thin_border
+    if all_ln2:
+        ws.cell(row=summary_row, column=5, value=round(sum(all_ln2) / len(all_ln2), 1)).border = thin_border
+
+    # Save to buffer
+    output = io.BytesIO()
+    wb.save(output)
+    output.seek(0)
+
+    # Generate filename
+    filename = file_record.file_path.split('/')[-1].replace('.rnd', '')
+    if location:
+        filename = f"{location.name}_{filename}"
+    filename = f"{filename}_report.xlsx"
+    # Clean filename
+    filename = "".join(c for c in filename if c.isalnum() or c in ('_', '-', '.')).rstrip()
+
+    return StreamingResponse(
+        output,
+        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        headers={"Content-Disposition": f'attachment; filename="{filename}"'}
+    )
+
+
+@router.get("/{project_id}/generate-combined-report")
+async def generate_combined_excel_report(
+    project_id: str,
+    report_title: str = Query("Background Noise Study", description="Title for the report"),
+    db: Session = Depends(get_db),
+):
+    """
+    Generate a combined Excel report from all RND files in a project.
+
+    Creates a multi-sheet Excel workbook with:
+    - One sheet per location/RND file
+    - Data tables with LAmax, LA01, LA10
+    - Line charts for each location
+    - Summary sheet combining all locations
+
+    Column mapping from RND to Report:
+    - Lmax(Main) -> LAmax (dBA)
+    - LN1(Main) -> LA01 (dBA)  [L1 percentile]
+    - LN2(Main) -> LA10 (dBA)  [L10 percentile]
+    """
+    from backend.models import DataFile
+    from pathlib import Path
+    import csv
+
+    try:
+        import openpyxl
+        from openpyxl.chart import LineChart, Reference
+        from openpyxl.styles import Font, Alignment, Border, Side, PatternFill
+        from openpyxl.utils import get_column_letter
+    except ImportError:
+        raise HTTPException(
+            status_code=500,
+            detail="openpyxl is not installed. Run: pip install openpyxl"
+        )
+
+    # Get project
+    project = db.query(Project).filter_by(id=project_id).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+
+    # Get all sessions with measurement files
+    sessions = db.query(RecordingSession).filter_by(project_id=project_id).all()
+
+    # Collect all Leq RND files grouped by location
+    # Only include files with '_Leq_' in the path (15-minute averaged data)
+    # Exclude Lp files (instantaneous 100ms readings)
+    location_files = {}
+    for session in sessions:
+        files = db.query(DataFile).filter_by(session_id=session.id).all()
+        for file in files:
+            # Only include Leq files for reports (contain '_Leq_' in path)
+            is_leq_file = file.file_path and '_Leq_' in file.file_path and file.file_path.endswith('.rnd')
+            if is_leq_file:
+                location = db.query(MonitoringLocation).filter_by(id=session.location_id).first() if session.location_id else None
+                location_name = location.name if location else f"Session {session.id[:8]}"
+
+                if location_name not in location_files:
+                    location_files[location_name] = []
+                location_files[location_name].append({
+                    'file': file,
+                    'session': session,
+                    'location': location
+                })
+
+    if not location_files:
+        raise HTTPException(status_code=404, detail="No Leq measurement files found in project. Reports require Leq data (files with '_Leq_' in the name).")
+
+    # Define styles
+    title_font = Font(bold=True, size=14)
+    header_font = Font(bold=True, size=10)
+    thin_border = Border(
+        left=Side(style='thin'),
+        right=Side(style='thin'),
+        top=Side(style='thin'),
+        bottom=Side(style='thin')
+    )
+    header_fill = PatternFill(start_color="DAEEF3", end_color="DAEEF3", fill_type="solid")
+
+    # Create Excel workbook
+    wb = openpyxl.Workbook()
+
+    # Remove default sheet
+    wb.remove(wb.active)
+
+    # Track all data for summary
+    all_location_summaries = []
+
+    # Create a sheet for each location
+    for location_name, file_list in location_files.items():
+        # Sanitize sheet name (max 31 chars, no special chars)
+        safe_sheet_name = "".join(c for c in location_name if c.isalnum() or c in (' ', '-', '_'))[:31]
+        ws = wb.create_sheet(title=safe_sheet_name)
+
+        # Row 1: Report title
+        final_title = f"{report_title} - {project.name}"
+        ws['A1'] = final_title
+        ws['A1'].font = title_font
+        ws.merge_cells('A1:G1')
+
+        # Row 3: Location name
+        ws['A3'] = location_name
+        ws['A3'].font = Font(bold=True, size=11)
+
+        # Row 7: Headers
+        headers = ['Test Increment #', 'Date', 'Time', 'LAmax (dBA)', 'LA01 (dBA)', 'LA10 (dBA)', 'Comments']
+        for col, header in enumerate(headers, 1):
+            cell = ws.cell(row=7, column=col, value=header)
+            cell.font = header_font
+            cell.border = thin_border
+            cell.fill = header_fill
+            cell.alignment = Alignment(horizontal='center')
+
+        # Set column widths
+        column_widths = [16, 12, 10, 12, 12, 12, 40]
+        for i, width in enumerate(column_widths, 1):
+            ws.column_dimensions[get_column_letter(i)].width = width
+
+        # Combine data from all files for this location
+        all_rnd_rows = []
+        for file_info in file_list:
+            file = file_info['file']
+            file_path = Path("data") / file.file_path
+
+            if not file_path.exists():
+                continue
+
+            try:
+                with open(file_path, 'r', encoding='utf-8', errors='replace') as f:
+                    content = f.read()
+
+                reader = csv.DictReader(io.StringIO(content))
+                for row in reader:
+                    cleaned_row = {}
+                    for key, value in row.items():
+                        if key:
+                            cleaned_key = key.strip()
+                            cleaned_value = value.strip() if value else ''
+                            if cleaned_value and cleaned_value not in ['-.-', '-', '']:
+                                try:
+                                    cleaned_value = float(cleaned_value)
+                                except ValueError:
+                                    pass
+                            elif cleaned_value in ['-.-', '-']:
+                                cleaned_value = None
+                            cleaned_row[cleaned_key] = cleaned_value
+                    all_rnd_rows.append(cleaned_row)
+            except Exception as e:
+                logger.warning(f"Error reading file {file.file_path}: {e}")
+                continue
+
+        if not all_rnd_rows:
+            continue
+
+        # Sort by start time
+        all_rnd_rows.sort(key=lambda r: r.get('Start Time', ''))
+
+        # Data rows starting at row 8
+        data_start_row = 8
+        for idx, row in enumerate(all_rnd_rows, 1):
+            data_row = data_start_row + idx - 1
+
+            ws.cell(row=data_row, column=1, value=idx).border = thin_border
+
+            start_time_str = row.get('Start Time', '')
+            if start_time_str:
+                try:
+                    dt = datetime.strptime(start_time_str, '%Y/%m/%d %H:%M:%S')
+                    ws.cell(row=data_row, column=2, value=dt.date())
+                    ws.cell(row=data_row, column=3, value=dt.time())
+                except ValueError:
+                    ws.cell(row=data_row, column=2, value=start_time_str)
+                    ws.cell(row=data_row, column=3, value='')
+            else:
+                ws.cell(row=data_row, column=2, value='')
+                ws.cell(row=data_row, column=3, value='')
+
+            lmax = row.get('Lmax(Main)')
+            ws.cell(row=data_row, column=4, value=lmax if lmax else '').border = thin_border
+
+            ln1 = row.get('LN1(Main)')
+            ws.cell(row=data_row, column=5, value=ln1 if ln1 else '').border = thin_border
+
+            ln2 = row.get('LN2(Main)')
+            ws.cell(row=data_row, column=6, value=ln2 if ln2 else '').border = thin_border
+
+            ws.cell(row=data_row, column=7, value='').border = thin_border
+            ws.cell(row=data_row, column=2).border = thin_border
+            ws.cell(row=data_row, column=3).border = thin_border
+
+        data_end_row = data_start_row + len(all_rnd_rows) - 1
+
+        # Add Line Chart
+        chart = LineChart()
+        chart.title = f"{location_name}"
+        chart.style = 10
+        chart.y_axis.title = "Sound Level (dBA)"
+        chart.x_axis.title = "Test Increment"
+        chart.height = 12
+        chart.width = 20
+
+        data_ref = Reference(ws, min_col=4, min_row=7, max_col=6, max_row=data_end_row)
+        categories = Reference(ws, min_col=1, min_row=data_start_row, max_row=data_end_row)
+
+        chart.add_data(data_ref, titles_from_data=True)
+        chart.set_categories(categories)
+
+        if len(chart.series) >= 3:
+            chart.series[0].graphicalProperties.line.solidFill = "FF0000"
+            chart.series[1].graphicalProperties.line.solidFill = "00B050"
+            chart.series[2].graphicalProperties.line.solidFill = "0070C0"
+
+        ws.add_chart(chart, "I3")
+
+        # Calculate summary for this location
+        all_lmax = [r.get('Lmax(Main)') for r in all_rnd_rows if isinstance(r.get('Lmax(Main)'), (int, float))]
+        all_ln1 = [r.get('LN1(Main)') for r in all_rnd_rows if isinstance(r.get('LN1(Main)'), (int, float))]
+        all_ln2 = [r.get('LN2(Main)') for r in all_rnd_rows if isinstance(r.get('LN2(Main)'), (int, float))]
+
+        all_location_summaries.append({
+            'location': location_name,
+            'samples': len(all_rnd_rows),
+            'lmax_avg': round(sum(all_lmax) / len(all_lmax), 1) if all_lmax else None,
+            'ln1_avg': round(sum(all_ln1) / len(all_ln1), 1) if all_ln1 else None,
+            'ln2_avg': round(sum(all_ln2) / len(all_ln2), 1) if all_ln2 else None,
+        })
+
+    # Create Summary sheet at the beginning
+    summary_ws = wb.create_sheet(title="Summary", index=0)
+
+    summary_ws['A1'] = f"{report_title} - {project.name} - Summary"
+    summary_ws['A1'].font = title_font
+    summary_ws.merge_cells('A1:E1')
+
+    summary_headers = ['Location', 'Samples', 'LAmax Avg', 'LA01 Avg', 'LA10 Avg']
+    for col, header in enumerate(summary_headers, 1):
+        cell = summary_ws.cell(row=3, column=col, value=header)
+        cell.font = header_font
+        cell.fill = header_fill
+        cell.border = thin_border
+
+    for i, width in enumerate([30, 10, 12, 12, 12], 1):
+        summary_ws.column_dimensions[get_column_letter(i)].width = width
+
+    for idx, loc_summary in enumerate(all_location_summaries, 4):
+        summary_ws.cell(row=idx, column=1, value=loc_summary['location']).border = thin_border
+        summary_ws.cell(row=idx, column=2, value=loc_summary['samples']).border = thin_border
+        summary_ws.cell(row=idx, column=3, value=loc_summary['lmax_avg'] or '-').border = thin_border
+        summary_ws.cell(row=idx, column=4, value=loc_summary['ln1_avg'] or '-').border = thin_border
+        summary_ws.cell(row=idx, column=5, value=loc_summary['ln2_avg'] or '-').border = thin_border
+
+    # Save to buffer
+    output = io.BytesIO()
+    wb.save(output)
+    output.seek(0)
+
+    # Generate filename
+    project_name_clean = "".join(c for c in project.name if c.isalnum() or c in ('_', '-', ' ')).strip()
+    filename = f"{project_name_clean}_combined_report.xlsx"
+    filename = filename.replace(' ', '_')
+
+    return StreamingResponse(
+        output,
+        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        headers={"Content-Disposition": f'attachment; filename="{filename}"'}
+    )
+
+
 @router.get("/types/list", response_class=HTMLResponse)
 async def get_project_types(request: Request, db: Session = Depends(get_db)):
     """
diff --git a/requirements.txt b/requirements.txt
index 9c7ba93..542f015 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,3 +7,4 @@ jinja2==3.1.2
 aiofiles==23.2.1
 Pillow==10.1.0
 httpx==0.25.2
+openpyxl==3.1.2
diff --git a/templates/partials/projects/project_header.html b/templates/partials/projects/project_header.html
index 3232aba..14d0e12 100644
--- a/templates/partials/projects/project_header.html
+++ b/templates/partials/projects/project_header.html
@@ -1,14 +1,30 @@
 <div class="mb-8">
-    <h1 class="text-3xl font-bold text-gray-900 dark:text-white mb-2">{{ project.name }}</h1>
-    <div class="flex items-center gap-4">
-        <span class="inline-flex items-center px-3 py-1 rounded-full text-sm font-medium
-                     {% if project.status == 'active' %}bg-green-100 text-green-800 dark:bg-green-900 dark:text-green-200
-                     {% elif project.status == 'completed' %}bg-blue-100 text-blue-800 dark:bg-blue-900 dark:text-blue-200
-                     {% else %}bg-gray-100 text-gray-800 dark:bg-gray-700 dark:text-gray-200{% endif %}">
-            {{ project.status|title }}
-        </span>
-        {% if project_type %}
-        <span class="text-gray-500 dark:text-gray-400">{{ project_type.name }}</span>
-        {% endif %}
+    <div class="flex flex-col md:flex-row md:items-center md:justify-between gap-4">
+        <div>
+            <h1 class="text-3xl font-bold text-gray-900 dark:text-white mb-2">{{ project.name }}</h1>
+            <div class="flex items-center gap-4">
+                <span class="inline-flex items-center px-3 py-1 rounded-full text-sm font-medium
+                             {% if project.status == 'active' %}bg-green-100 text-green-800 dark:bg-green-900 dark:text-green-200
+                             {% elif project.status == 'completed' %}bg-blue-100 text-blue-800 dark:bg-blue-900 dark:text-blue-200
+                             {% else %}bg-gray-100 text-gray-800 dark:bg-gray-700 dark:text-gray-200{% endif %}">
+                    {{ project.status|title }}
+                </span>
+                {% if project_type %}
+                <span class="text-gray-500 dark:text-gray-400">{{ project_type.name }}</span>
+                {% endif %}
+            </div>
+        </div>
+        <!-- Project Actions -->
+        <div class="flex items-center gap-3">
+            {% if project_type and project_type.id == 'sound_monitoring' %}
+            <a href="/api/projects/{{ project.id }}/generate-combined-report"
+               class="px-4 py-2 bg-emerald-600 text-white rounded-lg hover:bg-emerald-700 transition-colors flex items-center gap-2 text-sm">
+                <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 17v-2m3 2v-4m3 4v-6m2 10H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path>
+                </svg>
+                Generate Combined Report
+            </a>
+            {% endif %}
+        </div>
     </div>
 </div>
diff --git a/templates/partials/projects/unified_files.html b/templates/partials/projects/unified_files.html
index a9b284c..6b813cb 100644
--- a/templates/partials/projects/unified_files.html
+++ b/templates/partials/projects/unified_files.html
@@ -42,6 +42,24 @@
                             {% else %}bg-gray-100 text-gray-800 dark:bg-gray-700 dark:text-gray-300{% endif %}">
                             {{ session.status or 'unknown' }}
                         </span>
+                        <!-- Download All Files in Session -->
+                        <button onclick="event.stopPropagation(); downloadSessionFiles('{{ session.id }}')"
+                                class="px-3 py-1 text-xs bg-seismo-orange text-white rounded-lg hover:bg-seismo-navy transition-colors flex items-center gap-1"
+                                title="Download all files in this session">
+                            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4"></path>
+                            </svg>
+                            Download All
+                        </button>
+                        <!-- Delete Session -->
+                        <button onclick="event.stopPropagation(); confirmDeleteSession('{{ session.id }}', '{{ files|length }}')"
+                                class="px-3 py-1 text-xs bg-red-600 text-white rounded-lg hover:bg-red-700 transition-colors flex items-center gap-1"
+                                title="Delete session and all files">
+                            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
+                            </svg>
+                            Delete
+                        </button>
                     </div>
                 </div>
             </div>
@@ -107,6 +125,17 @@
                                     {{ file.file_type or 'unknown' }}
                                 </span>
 
+                                {# Leq vs Lp badge for RND files #}
+                                {% if file.file_path and '_Leq_' in file.file_path %}
+                                <span class="px-1.5 py-0.5 rounded font-medium bg-blue-100 text-blue-700 dark:bg-blue-900/30 dark:text-blue-300">
+                                    Leq (15-min avg)
+                                </span>
+                                {% elif file.file_path and '_Lp' in file.file_path and file.file_path.endswith('.rnd') %}
+                                <span class="px-1.5 py-0.5 rounded font-medium bg-orange-100 text-orange-700 dark:bg-orange-900/30 dark:text-orange-300">
+                                    Lp (instant)
+                                </span>
+                                {% endif %}
+
                                 <!-- File Size -->
                                 <span class="mx-1">•</span>
                                 {% if file.file_size_bytes %}
@@ -159,6 +188,18 @@
                                 View
                             </a>
                             {% endif %}
+                            {# Only show Report button for Leq files (15-min averaged data with LN percentiles) #}
+                            {% if '_Leq_' in file.file_path %}
+                            <a href="/api/projects/{{ project_id }}/files/{{ file.id }}/generate-report"
+                               onclick="event.stopPropagation();"
+                               class="px-3 py-1 text-xs bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors flex items-center"
+                               title="Generate Excel Report">
+                                <svg class="w-4 h-4 inline mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 17v-2m3 2v-4m3 4v-6m2 10H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path>
+                                </svg>
+                                Report
+                            </a>
+                            {% endif %}
                             <button onclick="event.stopPropagation(); downloadFile('{{ file.id }}')"
                                     class="px-3 py-1 text-xs bg-seismo-orange text-white rounded-lg hover:bg-seismo-navy transition-colors">
                                 <svg class="w-4 h-4 inline mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
@@ -166,6 +207,13 @@
                                 </svg>
                                 Download
                             </button>
+                            <button onclick="event.stopPropagation(); confirmDeleteFile('{{ file.id }}', '{{ file.file_path.split('/')[-1] if file.file_path else 'Unknown' }}')"
+                                    class="px-3 py-1 text-xs bg-red-600 text-white rounded-lg hover:bg-red-700 transition-colors"
+                                    title="Delete this file">
+                                <svg class="w-4 h-4 inline" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
+                                </svg>
+                            </button>
                         </div>
                         {% endif %}
                     </div>
@@ -212,4 +260,56 @@ function toggleSession(sessionId, headerElement) {
 function downloadFile(fileId) {
     window.location.href = `/api/projects/{{ project_id }}/files/${fileId}/download`;
 }
+
+function downloadSessionFiles(sessionId) {
+    window.location.href = `/api/projects/{{ project_id }}/sessions/${sessionId}/download-all`;
+}
+
+function confirmDeleteFile(fileId, fileName) {
+    if (confirm(`Are you sure you want to delete "${fileName}"?\n\nThis action cannot be undone.`)) {
+        deleteFile(fileId);
+    }
+}
+
+async function deleteFile(fileId) {
+    try {
+        const response = await fetch(`/api/projects/{{ project_id }}/files/${fileId}`, {
+            method: 'DELETE'
+        });
+
+        if (response.ok) {
+            // Reload the files list
+            window.location.reload();
+        } else {
+            const data = await response.json();
+            alert(`Failed to delete file: ${data.detail || 'Unknown error'}`);
+        }
+    } catch (error) {
+        alert(`Error deleting file: ${error.message}`);
+    }
+}
+
+function confirmDeleteSession(sessionId, fileCount) {
+    if (confirm(`Are you sure you want to delete this session and all ${fileCount} file(s)?\n\nThis action cannot be undone.`)) {
+        deleteSession(sessionId);
+    }
+}
+
+async function deleteSession(sessionId) {
+    try {
+        const response = await fetch(`/api/projects/{{ project_id }}/sessions/${sessionId}`, {
+            method: 'DELETE'
+        });
+
+        if (response.ok) {
+            // Reload the files list
+            window.location.reload();
+        } else {
+            const data = await response.json();
+            alert(`Failed to delete session: ${data.detail || 'Unknown error'}`);
+        }
+    } catch (error) {
+        alert(`Error deleting session: ${error.message}`);
+    }
+}
 </script>
diff --git a/templates/rnd_viewer.html b/templates/rnd_viewer.html
index ed4a7f4..c2f805a 100644
--- a/templates/rnd_viewer.html
+++ b/templates/rnd_viewer.html
@@ -59,12 +59,23 @@
                 </p>
             </div>
             <div class="flex items-center gap-3">
+                {# Only show Report button for Leq files (15-min averaged data with LN percentiles) #}
+                {% if file and '_Leq_' in file.file_path %}
+                <!-- Generate Excel Report Button -->
+                <button onclick="openReportModal()"
+                        class="px-4 py-2 bg-emerald-600 text-white rounded-lg hover:bg-emerald-700 transition-colors flex items-center gap-2">
+                    <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 17v-2m3 2v-4m3 4v-6m2 10H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path>
+                    </svg>
+                    Generate Excel Report
+                </button>
+                {% endif %}
                 <a href="/api/projects/{{ project_id }}/files/{{ file_id }}/download"
                    class="px-4 py-2 bg-seismo-orange text-white rounded-lg hover:bg-seismo-navy transition-colors flex items-center gap-2">
                     <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                         <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4"></path>
                     </svg>
-                    Download File
+                    Download RND
                 </a>
                 <a href="/projects/{{ project_id }}"
                    class="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-700 dark:text-gray-300 rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600 transition-colors">
@@ -441,5 +452,115 @@ function escapeHtml(str) {
     div.textContent = str;
     return div.innerHTML;
 }
+
+// Report Generation Modal Functions
+function openReportModal() {
+    document.getElementById('report-modal').classList.remove('hidden');
+    // Pre-fill location name if available
+    const locationInput = document.getElementById('report-location');
+    if (locationInput && !locationInput.value) {
+        locationInput.value = '{{ location.name if location else "" }}';
+    }
+}
+
+function closeReportModal() {
+    document.getElementById('report-modal').classList.add('hidden');
+}
+
+function generateReport() {
+    const reportTitle = document.getElementById('report-title').value || 'Background Noise Study';
+    const locationName = document.getElementById('report-location').value || '';
+
+    // Build the URL with query parameters
+    const params = new URLSearchParams({
+        report_title: reportTitle,
+        location_name: locationName
+    });
+
+    // Trigger download
+    window.location.href = `/api/projects/{{ project_id }}/files/{{ file_id }}/generate-report?${params.toString()}`;
+
+    // Close modal
+    closeReportModal();
+}
+
+// Close modal on escape key
+document.addEventListener('keydown', function(e) {
+    if (e.key === 'Escape') {
+        closeReportModal();
+    }
+});
 </script>
+
+<!-- Report Generation Modal -->
+<div id="report-modal" class="hidden fixed inset-0 z-50 overflow-y-auto" aria-labelledby="modal-title" role="dialog" aria-modal="true">
+    <div class="flex items-end justify-center min-h-screen pt-4 px-4 pb-20 text-center sm:block sm:p-0">
+        <!-- Background overlay -->
+        <div class="fixed inset-0 bg-gray-500 bg-opacity-75 dark:bg-gray-900 dark:bg-opacity-75 transition-opacity" onclick="closeReportModal()"></div>
+
+        <!-- Modal panel -->
+        <div class="inline-block align-bottom bg-white dark:bg-slate-800 rounded-lg text-left overflow-hidden shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-lg sm:w-full">
+            <div class="bg-white dark:bg-slate-800 px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
+                <div class="sm:flex sm:items-start">
+                    <div class="mx-auto flex-shrink-0 flex items-center justify-center h-12 w-12 rounded-full bg-emerald-100 dark:bg-emerald-900/30 sm:mx-0 sm:h-10 sm:w-10">
+                        <svg class="h-6 w-6 text-emerald-600 dark:text-emerald-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 17v-2m3 2v-4m3 4v-6m2 10H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path>
+                        </svg>
+                    </div>
+                    <div class="mt-3 text-center sm:mt-0 sm:ml-4 sm:text-left flex-1">
+                        <h3 class="text-lg leading-6 font-medium text-gray-900 dark:text-white" id="modal-title">
+                            Generate Excel Report
+                        </h3>
+                        <div class="mt-4 space-y-4">
+                            <!-- Report Title -->
+                            <div>
+                                <label for="report-title" class="block text-sm font-medium text-gray-700 dark:text-gray-300">
+                                    Report Title
+                                </label>
+                                <input type="text" id="report-title" value="Background Noise Study"
+                                       class="mt-1 block w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md shadow-sm bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:outline-none focus:ring-emerald-500 focus:border-emerald-500 sm:text-sm"
+                                       placeholder="e.g., Background Noise Study - Commercial Street Bridge">
+                            </div>
+
+                            <!-- Location Name -->
+                            <div>
+                                <label for="report-location" class="block text-sm font-medium text-gray-700 dark:text-gray-300">
+                                    Location Name
+                                </label>
+                                <input type="text" id="report-location" value=""
+                                       class="mt-1 block w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md shadow-sm bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:outline-none focus:ring-emerald-500 focus:border-emerald-500 sm:text-sm"
+                                       placeholder="e.g., NRL 1 - West Side">
+                            </div>
+
+                            <!-- Info about what's included -->
+                            <div class="bg-gray-50 dark:bg-gray-900/50 rounded-lg p-3">
+                                <p class="text-xs text-gray-500 dark:text-gray-400">
+                                    <strong>Report will include:</strong>
+                                </p>
+                                <ul class="mt-1 text-xs text-gray-500 dark:text-gray-400 list-disc list-inside space-y-0.5">
+                                    <li>Data table (Test #, Date, Time, LAmax, LA01, LA10, Comments)</li>
+                                    <li>Line chart visualization</li>
+                                    <li>Time period summary (Evening, Night, Morning, Daytime)</li>
+                                </ul>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+            <div class="bg-gray-50 dark:bg-gray-900/50 px-4 py-3 sm:px-6 sm:flex sm:flex-row-reverse gap-2">
+                <button type="button" onclick="generateReport()"
+                        class="w-full inline-flex justify-center rounded-md border border-transparent shadow-sm px-4 py-2 bg-emerald-600 text-base font-medium text-white hover:bg-emerald-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-emerald-500 sm:w-auto sm:text-sm">
+                    <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4"></path>
+                    </svg>
+                    Generate & Download
+                </button>
+                <button type="button" onclick="closeReportModal()"
+                        class="mt-3 w-full inline-flex justify-center rounded-md border border-gray-300 dark:border-gray-600 shadow-sm px-4 py-2 bg-white dark:bg-gray-700 text-base font-medium text-gray-700 dark:text-gray-300 hover:bg-gray-50 dark:hover:bg-gray-600 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-emerald-500 sm:mt-0 sm:w-auto sm:text-sm">
+                    Cancel
+                </button>
+            </div>
+        </div>
+    </div>
+</div>
 {% endblock %}