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Project Details
Transportation & Government Services
Design of End of Pipe Treatment at the Ottawa Water Treatment Plant
This project is part of Dayton Water’s PFAS Strategy. The objective is to ensure compliance with PFAS Maximum Contaminant Levels by increasing production at the Miami Well Field to convey raw water to the Ottawa Treatment Plant. Blending water to decrease PFAS will reduce O&M expenses associated with end-of-pipe treatment. Installation of a 96 MGD treatment stream will bring PFAS concentrations at Ottawa Water Treatment Plant into compliance with the MCLs and protect public health.
Organization Details
City of Dayton
101 West Third Street
Dayton, Ohio. 45402
Montgomery
Same
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Government
Organization Contact Details
Rosalind Bertolo
Special Projects Administrator
City of Dayton
937-333-3755
320 West Monument Avenue
Dayton, Ohio. 45402
Montgomery
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Location Details
Dayton
Ohio
Ohio 10th
Financial Details
20000000
20000000
No source of a match is known at this time. The City of Dayton should not be responsible for the remediation of the PFAS contamination. Dayton did not cause the WPAFB contamination, which occurred outside of Dayton on property owned and controlled by the U.S. Government. The City has brought suit against the PFAS manufacturers as well as the Department of Defense in order to remediate these sites. It is inherently unfair to require the impoverished ratepayers of the City of Dayton to cover the cleanup of pollution that the City did not cause and that occurred outside of Dayton’s boundaries in areas where it had no control.
Construction or Capital
No
The City is working closely with OEPA regarding emerging contaminant funding. Funds allocated to OEPA through BIL may be available.
No
Immediately
OEPA Division of Environmental and Financial Assistance, State Revolving Loan Fund
Community Details
BACKGROUND
In 2016, the Environmental Protection Agency (EPA) introduced lower Health Advisory Levels (HAL) for perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) at 70 ppts. The City had previously monitored for PFOA and PFOS during the Third Unregulated Contaminant Monitoring Rule (UCMR3) 2013-1015, with the results showing as non-detect at Ottawa and Miami Water Treatment Plant, as the detection limits were 20 and 40ppt respectively.

Upstream of the City’s water source Wright Patterson Airforce Base (WPAFB) detected PFAS during UCMR3 above the HAL. Under the advisement of the regulatory agency and out of an abundance of caution, the City took aggressive actions to preserve the source water and ensure its customers receive safe, high-quality drinking water. Measures included:

• Expanding the early warning monitoring well network.
• Monitoring at the treatment plants.
• Removing production wells from operational rotation.

The removal of production wells from operational rotation was viewed as a temporary solution while the City investigated more sustainable solutions, using the data gained from the increased monitoring schedules. Also, removing production wells decreased the water systems redundancy and increased operational costs as production wells are not rotated on their normal schedules.
In 2018, an updated analytical method was approved, lowering the quantifiable concentration numbers of PFOA and PFOS. Thus, the City started seeing detections in its Mad River Well Field and its Ottawa Water Treatment. The Mad River Well Field supplies water to the Ottawa Water Treatment Plant and the Miami Well Field supplies water to the Miami Water Treatment Plant. Currently, the water supplies are separate.

In June 2022, the EPA again lowered HAL for perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), and introduced new HALS perfluorobutanesulfonic acid (PFBS), and GenX. The current City detections:
• PFOA 4 ppq (0.004ppt)
o Ottawa Water Treatment Plant 1.20 ppt (5/10/22)- 5.14 ppt (12/14/19)
o Miami Water Treatment Plant ND
• PFOS 20ppq (0.020ppt)
o Ottawa Water Treatment Plant 1.20 ppt (6/26/19)- 13.7 ppt (9/06/18)
o Miami Water Treatment Plant ND
• GenX 10ppt
o ND at Ottawa and Miami Water Treatment Points
• PFBS 2000 ppt
o ND at Ottawa and Miami Water Treatment Points

As previously stated, the City took temporary aggressive actions of removing production wells from operational rotation while waiting on the final guidance agency and developing a more permanent solution to manage PFAS contamination found in its water, based on data gathered from 2015 through the present.

SCOPE OF PROJECT
2.01 PURPOSE AND NEED / PROJECT DESCRIPTION. The City of Dayton, Department of Water (Dayton Water) is seeking proposals from a highly experienced and professional engineering Consultant to study the possible treatment of perfluoroalkyl substances (PFAS), including perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS), perfluorobutane sulfonic acid and its potassium salt (PFBS) and for hexafluoropropylene oxide (HFPO) dimer acid and its ammonium salt (“GenX chemicals"). The study shall consider all treatment technologies to bring the PFAS level to below the Heath Advisory Limit.

2.02 BACKGROUND INFORMATION.
Dayton Water owns and operates two well fields, Mad River and Miami, and two 96 MGD lime softening water treatment plants, Ottawa and Miami. The Miami Well Field is located in and around the former Kitty Hawk Golf Course. The Miami Treatment Plan is located at the southeast corner of the former golf course. The Mad River Well Field extends along the Mad River from northeast of North Irwin Street northeast to southwest of the Huffman Dam. As part of its PFAS strategy, Dayton Water looks to install a new treatment process to specifically eliminate PFAS in the finished water.

2.03 SCOPE OF WORK / PROJECT REQUIREMENTS.
The Consultant shall outline a proposed technical project approach, including specific tasks required to execute the project. The Proposal shall include the Consultant’s qualifications, experience, and approach to the project. This study should evaluate equipment cost, life cycle cost, performance, safety, flexibility for future treatment of new emerging contaminates, and installation requirements. The Study shall include:
1. Analysis of treatment technologies to eliminate PFAS from the City of Dayton’s finished water.
2. Maintain the 96 MGD rating of both treatment plants.
3. Include the existing lime softening process and recycling in the analysis.
4. Possible blending of water from the Miami Well Field.
5. Risks to the Miami Well field for PFAS contamination and increased stress on the aquifer due to increased pumping.
6. Energy requirements. Include emergency power risks.
7. Storage of finished water at Ottawa Treatment facility.
8. Flexibility to treat future emerging contaminates, including but not limited to 1,4-Dioxane and pharmaceuticals.
9. Elimination of the byproducts of treatment of PFAS
10. Life cycle costs of the new treatment.
11. Staffing levels and staffing educational requirements to maintain and operate the new treatment
12. Location of the new facility
13. Readying the site for construction of the new facility, including remediation (if necessary)
14. Perform a pilot study to prove the validity of the recommended approach.
15. Recommend the best construction delivery method for this large construction project.
16. Include a project schedule.
Deliverables, Milestones, and Project Schedule.
1. Provide a technical memo outlining each treatment option analyzed. Include reasons for and against each option. Present findings to City of Dayton staff.
2. Provide a thorough report on life cycle costs. Present findings to staff.
3. Provide a report on the constructability and project schedule. Present findings to City staff.
4. Perform a pilot study. Prepare results in a report. Present findings to staff.
5. The anticipated schedule for the project is six months for the study, six months for the pilot study, and an additional two months for project closeout.
No
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Additional Details
No
Rosalind Bertolo
937-333-3755
rosalind.bertolo@daytonohio.gov
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