1. Town of Dunn Sanitary District No. 3
Informational Meeting on Capital Improvement Plan
June 2, 2016

2. Capital Improvement Plan
Manhole Inspection
Review Sewer Video Recordings
Lift Station Inspections
Review Maintenance Records from Madison Metropolitan Sewerage District
Identified Defects and Needed Restoration
Established Three Phases for the Restoration Work and Estimated Costs

3. Gravity Sewer Mains and Manholes
Pipe Diameter (inches)
Quantity (linear feet) 8
35,133 10
1,983 12
4,556 15
1,032 18
593
Total
43,297
180 Four Foot Diameter Manholes

4. Lift Stations No. 1 No. 2 No. 3 Design Capacity (GPM/TDH)
600 / 41 feet
500 /
63 feet
300 /
35 feet
Pump Motor (HP) 15 20
7.5
Percentage of District Served
95%
78%
11%

5. Existing Flow Lift Station 1 Lift Station 2 Lift Station 3
Daily Average Flow (gpd)
63,000
50,700
10,300
Peak Daily Flow (gpd)
216,000
193,200
39,600
Peak Hourly Flow (gpm)
240
180
110
Peaking Factor (Peak Day/Average Day)
3.4
3.8

6. Current Peak Hourly Flow Percentage of Capacity Utilized
Lift Station 1
600 gpm
240 gpm
40%
Lift Station 2
500 gpm
180 gpm
36%
Lift Station 3
300 gpm
120 gpm
18” Gravity Sewer
1,540 gpm
612 gpm
39%
15” Gravity Sewer
1,120 gpm
55%
12” Gravity Sewer
730 gpm
33%
10” Gravity Sewer %
80%
8” Gravity Sewer %
22%

7. New System Map

8. Capital Improvement Plan
Phase One – Critical Infrastructure and Urgent Repairs
Phase Two – Lift Stations
Phase Three – Repairs to Remaining Collection System

9. Phase One Slip Line Critical Sections
Excavate and Relay Significant Sags
Grout MH Walls
Replace MH Lids with Open or No Pick Holes
Estimated Cost with Construction in $1,365,000

10. Phase One Map One

11. Phase One Map Two

12. Phase One Map Three

13. Phase One Map Four

14. Phase Two Paint Lift Stations
Replace Screening Box in Lift Station No. 3
Replace Control Panels
Estimated Cost with Construction in $138,000

15. Phase Three Slip Line Remaining Sewer Sections
Replace MH Lids with Open Pick Holes
Estimated Cost with Construction in $354,000

16. CIP Financing
Financing of these improvements could be accomplished by using funds in the District’s replacement account, loan(s) from the WDNR, and special assessments from the District.
The District is currently plans to finance Phases Two and Three from the replacement account.

17. Phase One Financing Options
Option 1 - $400,000 from District Replacement Account and $965,000 Loan
A 10-year loan of $965,000 at 2.275% (current WDNR loan rate) would result in an annual principal and interest payment of $108,000.
This would require an approximate $221 increase in annual sewer service charge to a residential customer or a 42% increase in current sewer service charges for 10 years.
Option 2 - $400,000 from District Replacement Account and $965,000 in Special Assessments
Would require a special assessment of approximately $1,977 for a typical residential user.
This would be a one-time 373% increase in sewer service charges.

18. Questions? Tim Astfalk, PE Project Manager 608-443-0482