1. Change Order 5, Contract S03003D01 Engineering Services for SSWRF Post-Secondary Capacity Improvements and Restore ED’s Original Delegated Authority Commission Agenda Item #5

2. SSWRF Capacity Increase
2020 Facilities Plan completed in 2007
Identified need to increase SSWRF peak wet weather capacity if population increased
WDNR permit requirement: District complete design of capacity increase by 12/31/17

3. SSWRF Capacity Increase
2016: Created 2 separate projects and 2 design contracts to accomplish design:
S02008: Preliminary and Secondary Capacity Improvements
Donohue Design Contract
S03003: Post Secondary Capacity Improvements
Arcadis Design Contract

4. Disinfection and Effluent Pumping Preliminary Treatment
Project S03003: Post Secondary Capacity Improvements:
Arcadis Design Contract
Project S02008: Preliminary and Secondary Capacity Improvements:
Donohue Design Contract
Secondary
Treatment
Primary Treatment
Preliminary Treatment

5. S03003D01 Contract-Arcadis
Original contract: design engineering for effluent pumping and disinfection processes
During preliminary design, staff recognized that population increases had not materialized
Other system modifications had also occurred
Staff requested and WDNR removed design requirement from permit
Directed Arcadis to stop work

6. Blending at SSWRF Wet weather, low cost operational procedure
Higher treatment rates while still meeting effluent quality limits
WDNR allows blending in SSWRF permit, but SSWRF does not have capabilities to blend

7. Blending at SSWRF Routes some flow around secondary treatment process
Recombines that flow with fully treated flow
Blended flow must meet all effluent water quality requirements under WPDES permit
By permit, can only be performed under certain wet weather conditions

8. 40 MGD Flow bypasses secondary treatment Preliminary Treatment
Disinfection
340 MGD
Treated effluent
340 MGD
40 MGD Flow bypasses secondary treatment
Secondary
Treatment
300 MGD
Primary Treatment
340 MGD
Influent sewer
340 MGD
Preliminary Treatment
340 MGD

9. Blending at SSWRF
District interested in blending, as it is a low cost way to increase capacity and reduce risk of overflows and basement backups
Some work by Arcadis and Donohue also applies to blending
Authorized Arcadis to evaluate how SSWRF might be able to blend
Work indicates blending is feasible, but some modifications needed

10. Disinfection and Effluent Pumping Preliminary Treatment
Project S03003: Post Secondary Capacity Improvements:
Arcadis Design Contract
Bypass Channel
Project S02008: Preliminary and Secondary Capacity Improvements:
Donohue Design Contract
Secondary
Treatment
Primary Treatment
Preliminary Treatment

11. Proposed Arcadis Contract Change Order
Engineering services related to blending
Chlorination and dechlorination system
Disinfection Mixing
Normal design services
Project management
Final bid and construction contract documents
Bid and award services
ESDC
O&M manual, training, and startup
Applications engineering

12. Sodium hypochlorite pumps
storage
CHLORINATION
Sodium hypochlorite pumps

13. Sodium bisulfite mixers
DECHLORINATION
Sodium bisulfite
pumps & storage
Sodium bisulfite mixers

14. ED Delegated Authority
For engineering service contracts greater than or equal to $500,000, Commission has delegated ED authority to make changes up to $200,000 or 10% of original contract price
Limit of $64,300 prevails for this contract
ED utilized $63,579, leaving balance $721
Request to restore ED’s authority in case other additional services needed

15. Full Implementation of Blending
S02008, Preliminary and Secondary Capacity Improvements, also has scope related to blending
Implementing projects S03003 and S02008 will allow blending up to 75 MGD above existing peak capacity of 300 MGD
Future Commission contract requests for work on Project S02008 to fully implement blending

16. QUESTIONS?
No need in this case to re-state the request.