Document eRNMLNvqO9wNdKq3qE4kedzg

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 10 1200 Sixth Avenue, Suite 155 Seattle, WA 98101 WATER DIVISION February 9, 2023 Mr. Justin Northern CTUIR Public Works Dept 46411 Timine Way Pendleton, OR 97801 Re: Violations for Failure to Monitor and Report CTUIR PWD/Mission, PWS ID 104111101 Dear Mr. Northern: The EPA did not receive sample results for the regulated drinking water contaminants in the table below as required under the National Primary Drinking Water Regulations (NPDWR). As a result, CTUIR PWD/Mission is in violation of the NPDWRs. Violation Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Monitoring and Reporting Sample Collection Location U-1.2, Well #1 & #2 Finished Combined U-2, Well #3 Finished Tap U-3, Well #4 Finished Tap U-4, Well #5 Finished Tap U-5.2, Well #6 Finished Tap U-1.2, Well #1 & #2 Finished Combined U-2, Well #3 Finished Tap U-5.2, Well #6 Finished Tap U-3, Well #4 Finished Tap U-4, Well #5 Finished Tap U-5.2, Well #6 Finished Tap Compliance Period 1/1/2020-12/31/2022 1/1/2020-12/31/2022 1/1/2020-12/31/2022 1/1/2020-12/31/2022 10/1/202212/31/2022 1/1/2020-12/31/2022 1/1/2020-12/31/2022 10/1/202212/31/2022 1/1/2020-12/31/2022 1/1/2020-12/31/2022 10/1/202212/31/2022 Analyte IOCs IOCs Dioxin (2,3,7,8TCDD) Dioxin (2,3,7,8TCDD) SOCs SOCs SOCs VOCs VOCs VOCs Radionuclides: Gross Alpha and Combined Radium (-226 and -228) Citation 40 CFR 141.23 40 CFR 141.23 40 CFR 141.24 40 CFR 141.24 40 CFR 141.24 40 CFR 141.24 40 CFR 141.24 40 CFR 141.24 40 CFR 141.24 40 CFR 141.24 40 CFR 141.26 Violation Follow-up or Routine Tap Sampling Sample Collection Location Approved Distribution System Tap Sampling Sites Compliance Period 7/1/2022-12/31/2022 Analyte Lead and Copper Citation 40 CFR 141.86 To return to compliance you must either: 1. Submit sample results if a sample was collected during the monitoring period. OR 1. Collect samples according to your current monitoring schedule and submit the results to EPA. 2. Notify customers of this violation within one year in your Consumer Confidence Report (CCR). This letter serves as initial notification of non-compliance under the Safe Drinking Water Act for the regulation and time period cited. EPA supports compliance assistance and encourages early action to return to compliance. Issues not addressed in a timely manner may be referred to enforcement. Prior to an enforcement action for the cited violation(s), EPA Region 10 will offer government-to-government consultation, in accordance with the EPA Policy on Consultation and Coordination with Indian Tribes. Please contact the Groundwater and Drinking Water Section at (206) 553-6253 or R10TribalDW@epa.gov to determine next steps or if you have questions. Sincerely, KAREN BURGESS Digitally signed by KAREN BURGESS Date: 2023.02.09 20:31:05 -08'00' Karen Burgess, Manager Groundwater and Drinking Water Section cc: Laddie Folster, IHS Spokane District Office Kris Powaukee, CTUIR Public Works 2