Matt Leach, P.E. CH2M. Mark Eppich, P.E. City of Columbus Division of Water. S. Dean Ramsey, P.E. CH2M

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1 Matt Leach, P.E. CH2M Mark Eppich, P.E. City of Columbus Division of Water S. Dean Ramsey, P.E. CH2M 1

2 Presentation Topics Project Background Project Team Unique Challenges and Opportunities Risk Assessment and Mitigation Factors That Cannot be Controlled Quality and Quantity Quantity Quality Current Project Status/Lessons Learned 2

3 3 PROJECT BACKGROUND

4 Columbus, OH Service Area 7.2 Billion Gal Parsons Ave. (groundwater) 15.9 Billion Gal Dublin Rd. Hap Cremean 25.6 Billion Gal Dublin Rd. Water Plant City of Columbus Hap Cremean Water Plant 48.7 billion gallons in % surface water Service population 1.16 million Parsons Ave. Water Plant (groundwater) 4

5 Treatment Plant Site COUNTY ENGINEER TREATMENT PLANT (1907/1972) US 33 PUBLIC ACCESS ADMIN BLDG 5 POST OFFICE RAILROAD

6 Existing Treatment Process Scioto River Conventional Lime Softening Plant 65 MGD Capacity Rapid Mix Flocculator Turbidity Settling Rapid Mix Flocculator Softening Settling Re-carbonation Filters Clearwell POTASSIUM PERMANGANATE PAC R3 ALUM Turbidity Basins 1 & 2 SODIUM HYDROXIDE SODA ASH LIME Softening Basins 2 & 3 Recarbonation Basin 4 CO2 SODIUM HYPOCHLORITE FLUORIDE Dual Media Filters West East ZN ORTHO-PHOSPHATE Scioto River Residual R7 Residual R1 Residual R2 Residual R3 Residual R2 6

7 Plant Treatment Goals Total Hardness: 120 mg/l to 125 mg/l as CaCO3 Alkalinity: >35 mg/l as CaCO3 Total Organic Carbon (TOC): <2.0 mg/l Nitrate: < 10 mg/l as N Atrazine: <2.5 ppb (MCL= 3.0 ppb) Stage 2 DBP Compliance: Target 80% of Location Running Annual Average (LRAA) and Operational Evaluation Level Comply with all primary drinking water regulations Taste and Odor 7

8 New Treatment Processes & Upgrades to 80 MGD Biologically Active Carbon Filters New Recarbonation System Ozone Ion Exchange Residuals Handling, Electrical, Pump Station, and Miscellaneous Plant Upgrades 8

9 9 PROJECT TEAM

10 Project Team Plant Operations & Maintenance Tools to the Operations Staff Pre- Construction Use 10

11 11 UNIQUE CHALLENGES & OPPORTUNITIES

12 UNIQUE CHALLENGES & OPPORTUNITIES Three Plants in System All Three Scheduled for Renovation Same Period Dual Power Feed to Plant Both Thru Same Substation Significant New Users Added to One Circuit City Owns Power System Dublin Rd. Water Plant City of Columbus Hap Cremean Water Plant Parsons Ave. Water Plant (groundwater) Plant Maintains System Pressures Short Response Time 12

13 13 RISK ASSESSMENT AND MITIGATION

14 Risk Assessment & Mitigation Ongoing Process in All Phases of Work Condition Assessment Criticality of Each Piece of Equipment Consequences of Failure Phasing Regulatory and Schedule Impacts Pilot Testing Capability of Processes/Potential Modifications Design Details-Construction Restrictions & Sequencing 14

15 Risk Assessment & Mitigation CONTRACTOR ENTRANCE 940 Construction Contract Phasing IEB CONTRACT 4 OGB OCB RCB CO2 TEMPORARY PUBLIC/EMPLOYEE ENTRANCE 15 TWIN RIVERS DRIVE POND PARK PARKING

16 16 FACTORS THAT CANNOT BE CONTROLLED

17 FACTORS THAT CANNOT BE CONTROLLED KEY FACTORS System Demand Weather Raw Water Quality MITIGATION FACTORS Share Demand Between Plants Upstream Monitoring Provide Tools for Treatment Plant Personnel Prepared 17

18 18 MAINTAINING QUANTITY & QUALITY

19 Phasing Criteria Quality & Quantity Regulatory Compliance Personnel & Public Safety Risk Assessment Contractor Work Areas/Interference/Use of Site Coordination with Construction at Other WTP Schedule and Approvals 19

20 20 QUANTITY

21 QUANTITY Three Plants System Hydraulic Model Demand Projections Power Upgrades 21

22 QUANTITY Replacement of: Residuals Pump Station High Service Pumps Raw Water Pumps Electrical System 22

23 23 QUALITY

24 QUALITY Approved Capacity for Each Process (OEPA) Upstream Monitoring Pilot Testing Existing New Historical Plant Data 24

25 CONSTRUCTION HOUSEKEEPING Filters Enclosure Requirements Performance Enforcement Exterior Improvements Open Basins Inflow Equipment in Basins High Service Pumps Control Room & Lab Crane in basin or filter 25

26 FILTERS Pilot tested existing and proposed media Rate (2.0 gpm/ft 2 to 3.4 gpm/ft 2 ) Performance Filters Out of Service Housekeeping Testing and Backwash 26

27 27 FILTERS

28 CHEMICAL FEED SYSTEMS Virtually every system rehabilitated or replaced Condition Assessment Risk Assessment Min. Tanks in Service Coordinate w/ Suppliers Removal w/o damaging Adjacent Tanks 28

29 RECARBONATION SYSTEM Installed a new Secondary System Operations prior to Shutdown of Existing Rental Tank during Switchover TEMPORARY RECARB EXISTING RECARB 29 NEW RECARB 29

30 POLYMER Coagulant Aid & Filter Aid Polymers Bench scale screening Plant scale testing Regulatory Approval Pre-Construction System Left in Place 30

31 31 PROJECT STATUS & LESSONS LEARNED

32 LESSONS LEARNED Expect the Unexpected PAC Quality Nitrate Event Need to Sweat the Small Stuff Chemical Deliveries (24/7) Good Housekeeping Emphasize Criticality Early Communication Sequencing & Restrictions Continuous Improvement Know Your Plant DESIGN & CM TEAM CITY STAFF CONTRACTOR 32

33 PROJECT STATUS Av. TOC MIB Geosmin % Removal RAW TAP <1.0 <1.0 DRWP THM (ug/l) 15-Jun 16-Jun % reduction AVG

34 PROJECT STATUS Av. TOC % Removal DRWP THM (ug/l) 15-Jun 16-Jun % reduction AVG DRWP HAA (ug/l) 15-Jun 16-Jun % reduction AVG

35 35 Thank you!

36 36 Questions?

37 37 37

38 38 38

39 Existing Treatment Plant Site Original Plant Existing Plant Constructed --mid 1970 s No option to obtain additional property Railroad Post Office Major Road plus Scioto River County Engineers Office and Abandoned Landfill Department of Public Utilities Office Complex 1980 s 39

40 Existing Treatment Plant Site Multi Purpose Site Treatment Plant DPU Administrative Offices Fleet Maintenance Facilities Support Facilities and Personnel Access Required at All Times Public Access and Parking Space for Future Treatment Requirements 40

41 TEMPORARY RECARB EXISTING RECARB 41 NEW RECARB 41

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