1. Water Filtration Plant Improvements Project Summary
Groton Utilities
Meeting Presentation
January 30, 2017

2. Project Pricing: Sitework Electrical Mechanical Building Improvements
WTP Rebuild
$43,901,043
Engineering
$4,198,508
Contingency
$5,900,449
Mechanical
Building Improvements
Finished Water Storage
DAF – Dissolved Air Flotation
GAC – Granular Activated Carbon
TOTAL PROJECT COST:
$54,000,000
Mn Contractors
Miscellaneous Process Control
THM Removal
Hazmat Removal
Contingency
Engineering

3. Project Facility History
1890’s Pumping Station
1938 – Unit 1 Construction
1947 to1952 – Unit 2 Construction
1960 – Unit 3 Construction
1974 – Sedimentation Basin Addition to Unit 3
1978 – Booster Station Added
1986 to 1989 – Spent Backwash Water & Sludge Lagoons
1989 – Chemical Feed Upgrades
1991 – Low Lift Pump Upgrade
1993 – Emergency Generators Replaced
2007 – SCADA system

4. Project History - Study & Preliminary Design
2007 – Sedimentation Basin Study & Recommendations
2008 – Pilot Study - Dissolved Air Floatation , Granular Activated Carbon and Manganese Contactors
2009 – Water Treatment Plant Evaluation & Conceptual Design Report
Opinion of Construction Cost $30M to $46M
2013 – Preliminary Design of Improvements DAF/GAC/Mn Contactors
Opinion of Construction Cost $29M to $41M
Project Review with Drs. Knocke & Edzwald

5. Project History - Design
2014 – Value Engineering Study at 30%
Opinion of Construction Cost $30M to $35M
2014 – Value Engineering Study at 60%
Opinion of Construction Cost $37.5M
2014 – Pilot Testing of Manganese Contactors
2016 February – Final Design Sent to CTDPH for review
2016 Summer – Address CTDPH Comments
August 2016 – Receive CTDPH approval to Bid the project

6. Project History – Bid Phase
August 24, 2016 – Advertise For Bid
September 2016 – Mandatory Prebid Conference for General Contractors
September General Contractor Site Visits
November 8, 2016 – General Contractor Bids Received
RH White
Banton
Carlin
DOC
Nickerson
Walsh
Base Bid
$43.9
$44.6
$45.67
$45.7
$47.9
$51.95
w/Deducts
$39.3
$40.8
$40.9
$41.6
$48.3
% Difference
1.6% 4%
4.1% 9%
18%

7. Architect Drawing

8. Overview of the Main Project Components

9. Overview of the Main Project Components
ELECTRICAL – Upgrade of 60 year old electrical system
MECHANICAL – Upgrade of 60 year old pump and piping systems
ENERGY CONSERVATION – Building envelope/equipment/HVAC
FIRE PROTECTION / EMERGENCY – Elevated Water Storage
CLARIFICATION – Construction of dissolved air flotation system
FILTRATION – Construction of deep bed granular activated carbon filters.
MANGANESE REMOVAL – Retrofit manganese contactors
PROCESS CONTROL – Supervisory control and data acquisition of all systems
TRIHALOMETHANE REMOVAL – Construction of systems in storage tanks existing and new

10. Operators View of Importance
Electrical Upgrade
Convert to Modern Voltage
Compatibility with GU electric system upgrade
Replace Outdated Electrical Equipment
Emergency Generators Odd Voltage
Switchgear No Longer supported

11. Operators View of Importance
Mechanical Pumping & Piping
Aged Pumps (1948 to 1991)
Variable Frequency Drives
Increase Reliability & Efficiency
Piping (Buried & Internal)
Aged Pipe
Inoperable Valves

12. Operators View of Importance
Energy Conservation
Upgrade Electrical System
Building Envelop Improvements
Insulation,
new windows
Modern Heating, Ventilation and Air Conditioning System
Credits / Rebates
Overall Energy Savings

13. Operators View of Importance
Finished Water Storage
Limited useable depth in the existing
Increase for Fire Protection
Backwashing Filters
Capacity for Regional Demands
Allow for WFP shutdowns for maintenance

14. Importance of Treatment & Chemical Systems
CLARIFICATION
Better at removing small light particles, color compounds, and algae than current sedimentation treatment
Chemical application - same dose of coagulant is more effective at removing turbidity
SAFETY – Operators don’t have to enter basins to remove solids

15. Importance of Treatment & Chemical Systems
Filtration
Granular Activated Carbon
More effective at removing a wide assortment of contaminants, especially organics, than rapid sand filters
Deep bed GAC is more effective than GAC-capped rapid sand filters (1930s technology with a “lid” of GAC)
New filters will have filter-to-waste technology as required by regulations

16. Importance of Treatment & Chemical Systems
Manganese Removal Contactors
Retrofit
Removes Mn without chemical treatment (currently CIO2; by-products = Chlorite, Chlorate
Currently a Health Advisory for Mn (0.3 mg/L), not an MCL
On test list for UCMR4 ( sampling period) for possible regulation
Regulated in Ontario, Canada

17. Operators View of Importance
Process Control
Upgrade Chemical Feed Systems
SCADA Upgrades
Increase Flexibility & Reliability
Improve regulatory compliance

18. Importance of Treatment & Chemical Systems
Trihalomethanes (THMs) Removal
Regulations are Stricter
Current Plant does not address removal of Precursors
Form within Distribution System
Trihalomethanes are compounds formed when chlorine comes in contact with natural organic matter in water; they are an issue for any WTP that uses surface water reservoirs as their source water
Previous upgrades to current WTP were not able to address THM reductions, new plant processes and distribution system upgrade will achieve reductions in THMs (better turnover in Bailey Hill tank = less water age = less THMs

19. Project Pricing: Sitework Electrical Mechanical Building Improvements
WTP Rebuild
$43,901,043
Engineering
$4,198,508
Contingency
$5,900,449
Mechanical
Building Improvements
Finished Water Storage
DAF – Dissolved Air Flotation
GAC – Granular Activated Carbon
TOTAL PROJECT COST:
$54,000,000
Mn Contractors
Miscellaneous Process Control
THM Removal
Hazmat Removal
Contingency
Engineering

22. Questions ???