View study information and related resources
Study work will result in a variety of products, resources, and reports. Check back to view additional materials as they become available.
Risk Assessment for Human Health and Ecology | 2020-2022
- Final Human Health Risk Assessment (PDF) – Human health risk assessment for infiltration of reclaimed water into groundwater.
- Final Ecological Risk Assessment (PDF) – Ecological risk assessment for infiltration of reclaimed water into groundwater.
- Final Human Health Risk Assessment Scope of Work (PDF) – Work plan that describes the steps that will be taken in the human health risk assessment.
- Evaluation of the Work Plans for Human and Ecological Risk Assessment (PDF) – An evaluation of the work plans for human and ecological health risk assessment by a subcommittee of the NWRI Peer Review Panel.
- Final Ecological Risk Assessment Scope of Work (PDF) – Work plan that describes the steps that will be taken in the ecological risk assessment.
Technical Memos for Task 2 and Task 3 | 2019-2022
- Study Team Response to Panel Report 5, February 2022 (PDF) – Responses to comments and recommendations from the Peer Review Panel regarding the draft of the Human Health Risk Assessment.
- Steady-State Groundwater Model Development and Calibration (PDF) – A technical memo on the development, calibration approach, and description of the groundwater model.
- Residual Chemical Fate and Transport Analysis (PDF) – Results from the hydrogeologic model predicting estimated residual chemical concentrations to downstream wells and creeks at current and future reclaimed water infiltration rates.
- Study Team Response to Panel Report 4, September 2021 (PDF) – Responses to comments and recommendations from the Peer Review Panel regarding the drafts of the Residual Chemical Fate and Transport Analysis Technical Memorandum, Human Health Risk Assessment, and Ecological Risk Assessment.
- Screening Evaluation for the Human Health Risk Assessment (PDF) – Results from a human health screening evaluation of chemicals found in reclaimed water, to be used to inform the subsequent Human Health Risk Assessment.
- Screening Evaluation for the Ecological Risk Assessment (PDF) – Results from an ecological screening evaluation of chemicals found in reclaimed water, to be used to inform the subsequent Ecological Risk Assessment.
- Study Team Response to Panel Report 3, February 2020 (PDF) – Responses to comments and recommendations from the Peer Review Panel regarding the Tracer Test and Water Quality Monitoring Report, and the screening evaluations for the human health and ecological risk assessments.
- Work Plan for Groundwater Modeling Predictive Simulations and Residual Chemical Fate and Transport (PDF) – The work plan for how the hydrogeologic model will be used to predict flow velocity, flow path, percent reclaimed water, and residual chemical concentration at potential points of exposure. These concentrations will be used in the human health and ecological risk assessments
- Tracer Test and Water Quality Monitoring Report (PDF) – Results from the monitoring of groundwater wells for tracer and water quality parameters.
Preparatory Documents Task 2: Treatment Effectiveness Evaluation | 2018
- Hydrogeologic Characterization Report (PDF) – Description of the hydrogeologic field investigations and results.
- Hydrogeologic Peer Review Panel Report (PDF) – Final report from panel's review of the Hydrogeologic Characterization Report and the Tracer Testing and Water Quality Monitoring of Treatment Effectiveness Work Plan.
- Study Team Response to Panel Report 2, January 2018 (PDF) – Responses to comments and recommendations made by Peer Review Panel regarding the Hydrogeologic Characterization Report and the Tracer Testing and Water Quality Monitoring of Treatment Effectiveness Work Plan.
- Tracer Testing and Water Quality Monitoring of Treatment Effectiveness Work Plan (PDF) – Description of the approach and methods for the tracer testing and water quality monitoring of treatment effectiveness.
Technical Memos for Task 1: Water Quality Characterization | 2017
- Groundwater Quality Characterization (PDF) – Results of water quality sampling for residual chemicals and other parameters in groundwater in the two study areas – the Hawks Prairie Study Area, an area influenced by reclaimed water infiltration, and the Tumwater Study Area, an area not influenced by reclaimed water infiltration.
- Surface Water Quality Characterization (PDF) – Results of water quality sampling for residual chemicals and other parameters in surface water in the Hawks Prairie and Tumwater study areas.
- Wastewater and Reclaimed Water Quality Characterization (PDF) – Results of water quality sampling for residual chemicals and other parameters in wastewater and reclaimed water at the Budd Inlet Treatment Plant, the Budd Inlet Reclaimed Water Plant, and the Martin Way Reclaimed Water Plant.
Study Planning and Scoping | 2014
- Study Scope Peer Review Panel Report (PDF) – Final report from panel's review of the study design and draft Phase 3 scope of work.
- Study Team Response to Panel Report 1, August 2014 (PDF) – Responses to the Peer Review Panel Report, which includes comments and recommendations made by Peer Review Panel regarding study design and draft scope.
- Study Scope of Work for Phase 3 (PDF) – Description of work associated with the implementation phase of the study.
Public Involvement | 2013-2014
- Public Opinion Interviews Report (PDF) – Summary of a phone survey conducted in early 2013 of 400 residents to gain an understanding of public awareness, knowledge, interest, and perceptions regarding water, wastewater, reclaimed water, groundwater recharge, and related issues.
- Focus Group Report (PDF) – Summary of three citizen focus groups conducted in the fall of 2013 to learn how best to communicate about the study and the technical topics involved.
- Public Involvement Plan (PDF) – The plan will be adjusted as the study progresses to effectively engage the public, gather input and feedback, and encourage community dialogue.
- Public Opinion Phone Survey Report (PDF) – Summary of a phone survey conducted in early 2013 of 400 residents to gain an understanding of public awareness, knowledge, interest, and perceptions regarding water, wastewater, reclaimed water, groundwater recharge, and related issues.
Background Materials | 2013
- Case Study Summary (PDF) – Case studies for six different projects across the country that involve infiltrating reclaimed water into groundwater.
- State of the Science (PDF) – Summary of the State of the Science, based on a review of existing scientific research regarding study topics.
