Investigating stormwater runoff for tire derived anti-degradants from athletic fields

Executive Summary:

In recent decades, the prevalence of artificial turf fields have increased drastically. The University of Washington has installed numerous outdoor turf fields to benefit student health and well-being and create surfaces where students can train and recreate in all weather. However, the installation of fields filled with waste tire rubber may be negatively impacting aquatic life in nearby waterways. Recently, 6PPD-quinone (an ozone transformation product (TP) from a common tire rubber additive, 6PPD) was found to be very highly toxic to aquatic organisms, including coho salmon, chinook salmon, steelhead salmon. In fact, 6PPD-quinone is acutely toxic to coho salmon at extremely low concentrations (95 ng/L), placing 6PPD-quinone in the top five acutely toxic compounds to aquatic organisms. 

While the environmental impact alone makes the investigation of 6PPD-quinone (and related PPD compounds) pressing, there are important cultural, financial and societal impacts of its release into the environment that are extremely relevant for a public university on indigenous lands to study and prioritize. Native American tribes in the region have deeply rooted environmental and cultural relationships with the land that are closely tied to both water and aquatic species, namely salmon. Therefore, the monitoring and reduction of 6PPD-quinone release on campus is both of environmental and social significance for our local and broader communities.  

Emerging research over the last two years has focused on the impacts of tire wear particles from road runoff on receiving bodies of water, but little research has been conducted to determine the impacts of runoff from turf fields filled with waste tire rubber. Herein we propose a student-led, two-phase project to monitor the impact of UW turf fields on water quality and to develop solutions with interested stakeholders. This project will start with a feasibility study, and if the feasibility study is successful, a full scale monitoring project and evaluation of potential alternatives or treatments will follow. 

Goals for Phase I (Feasibility Study):

  • Collect turf infill samples from all five outdoor fields on UW Seattle campus.
  • Identify catch basins and outflows from turf field runoff for sampling.
  • Conduct bench-top maximum and environmentally relevant leaching studies on turf infill to determine potential leaching mass of 6PPD-quinone (and other antidegradant TPs).
  • Develop a sampling timeline and procedure for Phase II.
  • Identify infill alternatives or treatment options to assess in Phase II with the input of stakeholders.
  • Raise local awareness of the ecological and societal issues derived from 6PPD-quinone.
  • Conduct a perception study of how athletes, community groups, facilities, and staff perceive the different treatment or product replacement options.

Tentative Goals for Phase II:

  • Collect samples from previously identified catch basins during storm events throughout the rainy season (October-March).
  • Test alternative infill options for 6PPD-quinone leaching with bench-top studies to generate a list of product replacement options for facilities.
  • Evaluate potential treatment options for future studies (i.e. retention basin under Husky stadium or sorbent media filters).
  • Submit monitoring results for publication.

Student Involvement:

The involvement of undergraduate researchers, athletes and students is extremely important to the success of our proposed work. Furthermore, including students in our work will provide an invaluable learning experience to their undergraduate education. It is important to our project to incorporate future environmental scientists who will lead future directions in environmental research, and future sports administrators who will make decisions regarding the wellbeing of athletes and sports facilities (e.g., field surfaces). This project will be managed by a graduate student lead, employ multiple undergraduate student research assistants throughout both phases, open opportunities for graduate and undergraduate students to participate in independent study, and present opportunities for student groups and student volunteers to participate in research or perception studies. 

As the graduate student lead, I already have experience mentoring students. Specifically I have been working with a chemical engineering undergraduate student researcher for the last year and have been mentoring a Masters student researcher for two quarters. This project will allow me to continue mentoring students in a research setting and allow me to collaborate with students on field work and stakeholder studies. Our research lab values diversity and inclusion. The lab already has connections with programs that help to place historically marginalized students in research settings, and actively seeks researchers from diverse backgrounds. So recruiting students and volunteers would continue in this vein. 

This campus sustainability project would provide urban field work opportunities for students and allow students to be directly involved in data collection and sample processing. Often field work experiences require a significant time commitment and planning for students to participate, and are usually difficult to schedule around classes and other obligations, but an on campus research opportunity for students to sample turf or collect stormwater will eliminate these barriers, especially for extremely busy student athletes. Further, the opportunity for student athletes to learn about and understand how their field surfaces are designed and impact the surrounding environment and biodiversity of the region is an invaluable connection. This project is transdisciplinary and would not require significant research or STEM background for interested students to get involved in field work or stakeholder perspective studies. The project also provides paid and course credit opportunities for interested students to develop research skills to prepare them for graduate school or future careers.

The project lead and sponsoring department are committed to offering opportunities for historically marginalized students to participate in the project in accordance with their interests, backgrounds, and capabilities. With a special emphasis on incorporating students from indigenous communities. Below are some of the proposed student positions that will be created with each phase of the project:

Phase I (Feasibility Study):

  • Funding for two undergraduate students at 6-7 hours per week. One student will primarily do analytical sample processing. The other student will lead the interviews and surveys with interested stakeholders and connect with communities on and off campus. Both students will be co-authors on relevant publications.
  • We plan to host an undergraduate student from the Heritage University Engagement Achievement & Graduation for Low-income Students (EAGLES) program or Louis and Stokes Alliance for Minority participation (LSAMP) to conduct summer research. Heritage University is a minority serving institution located on the Yakama Indian Reservation with large populations of indigenous students. Faculty advisor Jessica Ray has hosted EAGLES students previously, and we will continue working with students from indigenous and/or minority communities for the CSF project given the important adverse toxicological impact of tire rubber product leachate to the salmon population and the cultural significance of salmon to tribal communities.
  • We plan to partner with Student Athletes of UW for Sustainability (SAUWS) to do outreach and recruit volunteers.
  • We will work with SAUWS to understand the perspectives of student athletes in regards to turf surfaces.
  • We plan to host a tour of the facilities at the Center for Urban Waters in Fall 2024 to show any interested student volunteers, student athletes, or undergraduate researchers the instrumentation used for this project. 

Phase II (Monitoring and evaluation of alternatives or treatments):

  • For Phase II, we will have two paid undergraduate student research positions available. Each position will be for 8 hours a week, and students will contribute to analytical processing of the stormwater samples and any alternative infill options we wish to explore. These positions will allow students to gain direct lab experience and understand the work that goes into environmental sample processing. These students will have the opportunity to participate as co-authors on publications.
  • There will also be opportunities for students to participate in the project by enrolling in independent study course credits or volunteering. This would be a great opportunity for students who would like to develop research skills or students in other disciplines who would like to conduct perception studies with interested stakeholders. 
  • Student researchers would ideally participate from impacted populations, such as student athletes and indigenous students. These positions will not require significant time commitment from students.

Education & Outreach:

This project plans to engage multiple stakeholders, including students throughout campus (particularly student athletes), UW staff in charge of managing turf facilities and purchasing, faculty with experience in environmental water chemistry research, Seattle and Pacific Northwest Communities especially indigenous communities, and researchers in Environmental Engineering. This education and outreach is important, especially for students who will go on to careers in environmental sectors and sports administration, so they can better understand the impacts of field installations and promote more sustainable and eco-friendly alternatives. Furthermore, publishing our work will help disseminate the findings of this study to broader audiences, and help advance and direct the emerging research on 6PPD-quinone, other PPD-quinones, and other PPD derived transformation products (TPs). Throughout both phases of the project, education and outreach on the impact of 6PPD-quinone will be a top priority. Some of the education and outreach opportunities for this project are included below and will span both Phase I and Phase II. 

  • We will connect with the organization Student Athletes of UW for Sustainability (SAUWS). Through this organization and the student athlete network, we plan to raise awareness of our project and garner student athlete volunteers for turf and water sample collection.
  • We will consult with Graduate and Professional Student Senate (GPSS) to guide project directions and ensure generation of complementary and high-impact research on 6PPD-quinone (and other PPD-quinones).
  • We plan to offer opportunities for undergraduate research assistants throughout both phases of the project, giving opportunities to train emerging environmental scientists and athletic managers with the opportunity for co-authorship on project publications. 
  • Undergraduate research assistant positions will not be limited to STEM students, but will include students interested in product replacement, athletic management, stakeholder perspectives, and community engagement.
  • Students from historically marginalized communities will be recruited for student research and volunteer positions for each phase of the project through advertised positions.
  • We plan to host an undergraduate student from the Heritage University Engagement Achievement & Graduation for Low-income Students (EAGLES) program or Louis and Stokes Alliance for Minority participation (LSAMP) to conduct summer research during each phase of the project. As mentioned before, Heritage University is a minority serving institution with large populations of indigenous students. This collaboration will allow us to make connections and incorporate research perspectives from indigenous researchers.
  • Student research assistants, volunteers, SAUWS members, and GPSS members will be invited on a field trip in Fall 2024 to learn more about the Center for Urban Waters (CUW) where the UW research team first identified and detected 6PPD-quinone using advanced analytical instrumentation.
  • We plan to give talks in relevant courses (e.g., CEE 598 Stormwater Management and Treatment) within the department of Civil and Environmental Engineering.
  • We plan to apply to “The Living Breath of wǝɫǝbʔaltxʷ: Indigenous Foods and Ecological Knowledge Symposium” at the University of Washington during or after completion of this project to present our work in connection with the impact of turf infill to salmon and indigenous communities. 
  • We will conduct structured interviews with UW recreation and athletics to understand the purchasing decisions and factors that influence field materials, installation, and treatment. 
    • One barrier with environmental efforts that require product replacement are that product recommendations may not meet performance requirements or preferences. By working with stakeholders (including student athletes and program managers), we can ensure that potential alternatives are feasible. 
    • Further, we can work with stakeholders to develop replacement or treatment options that are user friendly and favorable, so treatment or product replacement will be implemented without enforcement.
  • We plan to interview Muckleshoot Indian Tribal Staff to further incorporate indigenous perspectives into the project
Environmental Impact:
  • Living Systems and Biodiversity
  • Transportation
  • Waste
  • Water
  • Environmental Justice
  • Cultural Representation
Project Longevity:

If this project is awarded it will generate data and findings that can stand alone and do not require long term management and maintenance. That being said, there are many unknowns around the emerging contaminant 6PPD-quinone and related PPD TPs which require significant research. Significantly more environmental modeling needs to be conducted, and best practice methods and/or treatment methods need to be developed to mitigate impacts. The preliminary data collected during this two-phase project will be used to seed larger, external proposals submitted to the National Science Foundation and the National Institute of Environmental Health and Sciences program. I have already begun developing a network of mentors and advisors to aid in the success of this project and future projects, including Prof. Ray, Prof. Kolodziej, and Prof. Dodd. We plan to continue collaborating with the campus groups supporting this project (UW Athletics, Engineering Services, and Recreation) as new developments in future projects emerge.

Further my advisor Prof. Kolodziej has collaborative projects funded by the Washington State Department of Ecology addressing 6PPD-quinone impacts and sorption. The Washington State Department of Ecology product replacement division is interested in the impacts of rubber turf infill on the environment). We may be able to work with these contacts to conduct follow up studies or help draft policies and/or regulations for turf infill and for 6PPD-quinone, and PPD-quinones more generally. 

There are multiple opportunities for additional funding if this project indicates turf fields need to be investigated further. Additionally, if the stakeholders in this project identify treatment options as the best route to pursue, there are on-campus funding options to create technologies for removal, such as Co-Motion funding, which our lab has previously received to develop selective sorbents for other emerging organic contaminants.

Environmental Problem:

Since 1972, Lake Washington Salmon have been counted each year as they pass through the Ballard Locks by the Washington Department of Fish and Wildlife and the Muckleshoot Indian Tribal Staff. Salmon runs through the Locks were once abundant with hundreds of thousands of salmon migrating each year. Now the salmon run population is down to tens of thousands in recent years with a small fraction traveling to Cedar River each fall to spawn. There are many factors affecting local salmon populations from warming waters to increasing predator populations, but this doesn’t fully account for the severely decreasing population. In 2021, researchers in my co-advisor’s lab identified a tire-derived roadway contaminant that is responsible for acute toxicity to coho salmon: 6PPD-quinone. Studies examining the environmental effects of this compound suggest that other salmonid species (in addition to coho) are also sensitive to 6PPD-quinone in urban stormwater runoff. Salmon are a keystone species in the Pacific Northwest–particularly for Indigenous peoples’ economical and cultural practices.

The University of Washington campus was built on the lands of the Duwamish, Squamish, Tulalip, Muckleshoot, and Coast Salish People. On this land now exist multiple turf fields filled with rubber derived from waste tires which drain into Union Bay, a part of Lake Washington. These fields, as well as other athletic fields, may be furthering the rapid decline in salmon populations. Most research has focused on the impact of tire wear particles generated on roadways; therefore the impact of turf fields on the water quality and salmon populations is unknown. This project seeks to understand and mitigate 6PPD-quione (and other PPD-quinones) release into runoff flowing into Lake Washington. Characterizing the concentrations of PPD-quinones in the field runoff will help determine the potential impacts of these fields on salmon populations and the need for product replacement or treatment options.

Due to the recent discovery of 6PPD-quinone as an acute toxicant, there are significant knowledge gaps that exist, especially in regards to turf fields. Projects on this topic have yet to be externally funded. This project seeks to investigate the extent to which turf fields impact water quality to lay the groundwork for future product replacement or externally funded projects for characterization, fate and transport, and remediation of PPD-quinones or other PPD derived TPs. This knowledge will help keep the University of Washington at the forefront of sustainability and leadership. This project has focused on CSF funding for three reasons:

  1. The unique location of the turf fields near a waterway of historic salmon spawning migration.
  2. The presence of retention basins under Husky stadium that may be treating the runoff before it enters Union Bay.
  3. The opportunity to work with interested stakeholders to develop realistic solutions.

While this project is research-focused, the project will be conducted by students, including scientists from underrepresented groups and backgrounds. Further this project will help protect salmon and local biodiversity, which are of ecological and cultural importance to the indigenous groups of this land as well as all people of Seattle

Explain how the impacts will be measured:

The ultimate goal of this project is to increase the number of salmon that spawn in Lake Washington annually and reduce aquatic contamination from an emerging class of chemical toxicants (PPD-quinones). However, these goals are affected by multiple factors and are difficult to achieve in a year long project. Realistically, the impact of the project can be measured by the following:

  • Student Involvement:
    • Number of students involved directly in the research project.
    • Number of students who participate in lab tours.
    • Learning outcomes from class visits and public talks.
  • Data collection:
    • Data on turf field design and components, drainage, and presence of existing treatment options will be collected and compiled.
    • Concentrations on 6PPD-quinone (and other PPD-quinones) from maximum and environmentally relevant leaching studies on all existing and potential turf infill options will be generated and tabulated for use by researchers and staff designing facilities.
    • Concentrations of 6PPD-quinone (and other PPD-quinones) in runoff from various catch basins will be determined to monitor tire-derived turf infill contaminants entering receiving waterways.
      • Specifically, catch basins before and after the retention basins in Husky stadium will be monitored and evaluated as a potential treatment option.
  • Idea generation for treatment/prevention options with interested stakeholders:
    • We will work with interested parties: UW staff in recreation, athletics, and facilities, student athletes, and indigenous groups to generate a list of treatment/prevention options that would be accepted and likely to be adopted.
    • If time permits in Phase II, preliminary treatment options may be tested.
  • Publication, outreach, and research articles:
    • We will work with UW News or the UW sustainability blog to publish a public article on our work.
    • We will present our findings to relevant community groups. Specifically we will apply to “The Living Breath of wǝɫǝbʔaltxʷ: Indigenous Foods and Ecological Knowledge Symposium” at the University of Washington to present our work in connection with the impact of turf infill to salmon and indigenous communities. 
    • We will publish one to two research articles detailing the findings on the turf infill leachate concentrations and the concentrations of field runoff in catchment basins in peer-reviewed journals. 
    • After project completion, we will work with student athletes to create signage near Husky stadium that details the sustainable impacts of this CSF project.
Total amount requested from the CSF: $20,000
This funding request is a: Grant
If this is a loan, what is the estimated payback period?:

Budget:

A brief description of the general budget breakdown for the proposed 4 month feasibility study.
ItemCost per ItemQuantityTotal Cost
Graduate Student Funding$2,779 per month4 months$11,116
Undergraduate Research Assistant (hourly)$18.69 per hour2 students, 4 months, 6-7 hours a week each$3,888
Laboratory SuppliesVariableVariable$2,546
LC-MS/MS Instrument Time$70 per hour~35 hours$2,450

Non-CSF Sources:

Project Completion Total: $20,000

Timeline:

Brief description of the technical timeline for the feasibility study (Phase I).
TaskTimeframeEstimated Completion Date
Collection of turf infill samples from all UW turf fields2-4 weeksApril 15th, 2024
Solvent extraction (maximum extraction) of all collected infill options2 weeksApril 30th, 2024
Aqueous extraction (environmentally relevant extraction) of all collected infill options4 weeksJune 1st, 2024
LC-MS/MS testing of solvent and aqueous extracts4 weeksJune 15th, 2024
Summary of findings (report, figures, and statistical analysis)6 weeksJuly 30th, 2024
Accessing structural drawings to understand turf field drainage for all turf fields on campus2 weeksApril 30th, 2024
Determining feasibility and accessibility of stormwater collection from each turf field3 weeksMay 25th, 2024
Developing sampling plan and protocols 3 weeksJune 15th, 2024
Conduct interviews with facilities, recreation, and athletics to determine project directions and priorities4 weeksJune 15th, 2024