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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 4 Laboratory Services & Applied Science Division Water Quality Section 980 College Station Road Athens, Georgia 30605-2720 November 22, 2021 MEMORANDUM SUBJECT: Gunnison POTW Final Report Gunnison, MS LSASD Project ID: 21-0362 FROM: Chris McHugh, Environmental Engineer Water Quality Section THRU: Greg White, Chief Water Quality Section GREGORY WHITE Date: 2021.11.22 13:23:25 -05'00' Digitally signed by GREGORY WHITE TO: Jairo Castillo-Valenzuela, P.E., Chief Wastewater Enforcement Section Enforcement & Compliance Assistance Division Attached is the Final Report for the Gunnison POTW NPDES Reconnaissance Inspection. If you have any questions concerning the sampling event, please call me at (706) 410-4082 or email me at mchugh.christopher@epa.gov. Attachments: cc (via email): Dennis Sayre, ECAD Sandra Aker, LSASD Mission: To provide sound Science to our customers through superior environmental evaluation Vision: To be a solutions-oriented organization, and seen as a leader in sound science through innovation, responsive customer service, and cutting-edge expertise Project ID: 21-0362 NPDES Reconnaissance Inspection Report Gunnison POTW Mike Thompson Rd Gunnison, MS Project Date: September 22, 2021 Report Date: November 22, 2021 Project Leader: Chris McHugh Environmental Engineer Water Quality Section Field Services Branch Laboratory Services and Applied Science Division USEPA - Region 4 980 College Station Road Athens, Georgia 30605-2720 The ANSI National Accreditation Board attests that U.S. EPA Region 4 Laboratory Services and Applied Science Division fulfills the requirements of ISO/IEC 17025:2017 ANAB Forensic Testing & Calibration AR 3125:2019 in the field of Forensic Testing. The activities contained in this report fall within the scope of accreditation, Certificate Number: FT-0330. Expires 31 July 2022. LSASD ID: 21-0362 Final Report Page 1 of 7 Requestor: Jairo Castillo, Chief Water Enforcement Branch Enforcement and Compliance Assurance Division USEPA - Region 4 61 Forsyth Street SW Atlanta, GA, 30303-8960 Analytical Support: Inorganic Chemistry Section Laboratory Services and Applied Science Division 980 College Station Rd Athens, GA 30605 Approvals: LSASD Project Leader: Chris McHugh Water Quality Section Field Services Branch Laboratory Services and Applied Science Division Approving Official: GREGORY WHITE Date: 2021.11.22 13:24:25 -05'00' Digitally signed by GREGORY WHITE Greg White, Chief Water Qualtiy Section Field Services Branch Laboratory Services and Applied Science Division LSASD ID: 21-0362 Final Report Page 2 of 7 Table of Contents 1. INTRODUCTION................................................................................................................. 4 2. SUMMARY ........................................................................................................................... 4 3. GRAB SAMPLING RESULTS ........................................................................................... 5 List of Tables and Figures TABLE 1 - INSPECTION PERSONNEL ..................................................................................... 4 TABLE 2 - EPA SAMPLE RESULTS VS. PERMITTED LIMITS ............................................. 5 FIGURE 1 - SAMPLE COLLECTION POINT ............................................................................ 6 LSASD ID: 21-0362 Final Report Page 3 of 7 NPDES Reconnaissance Inspection Gunnison POTW (Permit No. MS0042943) 1. Introduction On September 22, 2021, a representative of the U.S. Environmental Protection Agency (USEPA) Region 4 Laboratory Services and Applied Science Division (LSASD) conducted a National Pollutant Discharge Elimination System (NPDES) Reconnaissance Inspection at Gunnison Publicly Owned Treatment Works (POTW) in Gunnison, Mississippi. The evaluation was requested by the ECAD Water Enforcement Branch as part of the agency's goal to address significant non-compliance (SNC) facilities. A grab sample was collected at 10:40 am and analyzed for Total Suspended Solids (TSS), Ammonia (NH3), and Biochemical Oxygen Demand (BOD5), listed on the issued NPDES Permit MS0042943. The inspection followed the procedures listed in the LSASD Project No. 21-0362 and 21-0363 Sample and Analysis Plan (SAP). Table 1 lists the sampling participants. Inspector Chris McHugh Table 1 - Inspection Personnel Organization USEPA Region 4 LSASD Date(s) on site 9/22/21 2. Summary The facility was accessed via gate and the facility grounds around the lagoon were heavily impacted by vegetation. Some attempt to clear the entrance was made prior to the inspection by city employees; however, access to the lagoon was limited due to overgrowth of vegetation. The operator of the facility was not present during the inspection. It was not evident that there was any disinfection of the lagoon effluent before leaving the treatment system. Because there was not a clear effluent discharge location, the sample was collected on the front edge of the lagoon as shown in Figure 1. The sample was analyzed for the parameters listed on the facility's NPDES permit (Total Suspended Solids, Ammonia, and Biochemical Oxygen Demand). It is recommended that ECAD work with the Mississippi Department of Environmental Quality (MDEQ) to determine the appropriate response to address the lack of disinfection and upkeep of the Gunnison POTW. LSASD ID: 21-0362 Final Report Page 4 of 7 3. Grab Sampling Results Since there was not an effluent discharge location found on the property, the grab sample was collected at the location in Figure 1 (3356'38" N, -9055'52" W) below at the edge of the lagoon. Note, effort was made to locate the permitted EFF001 location via Aerial maps, and but there isn't any indication on historic maps of a disinfection chamber or discharge location.) The sample results for TSS and BOD5 exceeded the permitted limits that are permissible to be discharged. Note, there was no discharge location found Table 2 - EPA Sample Results vs. Permitted Limits Analyte TSS NH3 BOD5 EPA Analytical Results 1400 mg/L 1.6 mg/L 89 mg/L *A Permitted Limit 45 mg/L Weekly Avg. 3.0 mg/L Weekly Avg. 45 mg/L Weekly Avg. Sample Location Lagoon edge Lagoon edge Lagoon edge DATA QUALIFIER DEFINITIONS *A - The analyte was analyzed in replicate. Reported value is an average value of the replicates. LSASD ID: 21-0362 Final Report Page 5 of 7 Figure 1 - Sample Collection Point 3356'38" N, -9055'52" W LSASD ID: 21-0362 Final Report Page 6 of 7 Appendix A The following table lists the total number of pages for each of the Analytical Datasheets for this report. Each document is contained in the PDF portfolio. R4LIMS ID 21-0362 Lab ID E213907-01 Analysis TSS Total Pages 7 21-0362 E213907-01 Ammonia as N 7 21-0362 E213907-01 BOD5 7 End of Report LSASD ID: 21-0362 Final Report Page 7 of 7 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman October 1, 2021 MEMORANDUM SUBJECT: FROM: THRU: TO: FINAL Analytical Report Project: 21-0362, Gunnison POTW Laura Ackerman LSB Inorganic Chemistry Section Chief John Deatrick, Chief Laboratory Services Branch Christopher McHugh Attached are the final results for the analytical groups listed below. This report shall not be reproduced except in full without approval of the Region 4 laboratory. These analyses were performed in accordance with the Laboratory Services Branch's Laboratory Operations and Quality Assurance Manual (LSB LOQAM) found at www.epa.gov/region4/sesd/asbsop. Any unique project data quality objectives specified in writing by the data requestor have also been incorporated into the data unless otherwise noted in the Report Narrative. Chemistry data have been verified based on the LSB LOQAM specifications and have been qualified by this laboratory if the applicable quality control criteria were not met. Verification is defined in Chapter 5 of the LSB LOQAM. For a listing of specific data qualifiers and explanations, please refer to the Data Qualifier Definitions included in this report. The reported results are accurate within the limits of the method(s) and are representative only of the samples as received by the laboratory. Analyses Included in this report: Method Used: Accreditations: Classical/Nutrient Analyses (CNA) Solids USGS I-3765-85 (Water) ISO Page 1 of 7 E213907 CNA FINAL 10 01 21 0912 10/1/21 9:12 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Sample Disposal Policy Due to limited space for long term sample storage, LSB's policy is to dispose of samples on a periodic schedule. Air samples collected in summa canisters will be disposed of 30 days following the issuance of this report. All other sample media including original samples, sample extracts and or digestates will be disposed of, in accordance with applicable regulations, 60 days from the date of this report. This sample disposal policy does not apply to criminal samples which are held until the laboratory is notified by the criminal investigators that case development and litigation are complete. These samples may be held in the laboratory's custody for a longer period of time. If samples require storage beyond the 60-day period, please contact the Sample Control Coordinator by e-mail at R4SampleCustody@epa.gov. Page 2 of 7 E213907 CNA FINAL 10 01 21 0912 10/1/21 9:12 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman SAMPLES INCLUDED IN THIS REPORT Project: 21-0362, Gunnison POTW Sample ID 21-0362-0001 Laboratory ID E213907-01 Matrix Wastewater Date Collected 9/21/21 10:40 Date Received 9/23/21 7:45 Page 3 of 7 E213907 CNA FINAL 10 01 21 0912 10/1/21 9:12 None UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman DATA QUALIFIER DEFINITIONS ACRONYMS AND ABBREVIATIONS CAS Chemical Abstracts Service Note: Analytes with no known CAS identifiers have been assigned codes beginning with "E", the EPA ID as assigned by the EPA Substance Registry System (www.epa.gov/srs), or beginning with "R4-", a unique identifier assigned by the EPA Region 4 laboratory. MDL Method Detection Limit - The minimum concentration of a substance (an analyte) that can be measured and reported with a 99% confidence that the analyte concentration is greater than zero. MRL Minimum Reporting Limit - Analyte concentration that corresponds to the lowest demonstrated level of acceptable quantitation. The MRL is sample-specific and accounts for preparation weights and volumes, dilutions, and moisture content of soil/sediments. TIC Tentatively Identified Compound - An analyte identified based on a match with the instrument software's mass spectral library. A calibration standard has not been analyzed to confirm the compound's identification or the estimated concentration reported. ACCREDITATIONS: ISO Accredited to ISO/IEC 17025:2017 and accreditation requirements for Forensic Science Testing Laboratories. Refer to the certificate and scope of accreditation FT-0330 at: http://www.epa.gov/aboutepa/about-region-4s-science-and-ecosystem-support-division-sesd NR Not accredited for this test. DW Accredited for conformance with ISO/IEC 17025:2017 and testing elements in the Fifth Edition of the Manual for the Certification of Laboratories Analyzing Drinking Water, EPA 815-R-05-004, 2005. Refer to the certificate and scope of accreditation AT-2628 at: http://www.epa.gov/aboutepa/about-region-4s-science-and-ecosystem-support-division-sesd ISO/DW Accredited to ISO/IEC 17025:2017 and accreditation requirements for Forensic Science Testing Labs, and conformance with ISO/IEC 17025:2017 and testing elements in the Manual for the Certification of Laboratories Analyzing Drinking Water. Page 4 of 7 E213907 CNA FINAL 10 01 21 0912 10/1/21 9:12 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Project: 21-0362, Gunnison POTW Classical/Nutrient Analyses Sample ID: 21-0362-0001 Station ID: EFF001 Date Collected: 9/21/21 10:40 CAS Number Analyte Lab ID: E213907-01 Matrix: Wastewater Results Qualifiers Units MRL Prepared Analyzed Method E1642818 Total Suspended Solids 1400 mg/L 9/23/21 5.0 10:00 9/23/21 USGS I-3765-85 10:00 Page 5 of 7 E213907 CNA FINAL 10 01 21 0912 10/1/21 9:12 Analyte Batch 2109047 - C 2540 Solids Blank (2109047-BLK1) USGS I-3765-85 Total Suspended Solids LCS (2109047-BS1) USGS I-3765-85 Total Suspended Solids LCS Dup (2109047-BSD1) USGS I-3765-85 Total Suspended Solids Duplicate (2109047-DUP1) USGS I-3765-85 Total Suspended Solids MRL Verification (2109047-PS1) USGS I-3765-85 Total Suspended Solids UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Classical/Nutrient Analyses (CNA) - Quality Control US-EPA, Region 4, LSASD Result Reporting Limit Units Spike Source %REC Level Result %REC Limits RPD Prepared & Analyzed: 09/23/21 U 5.0 mg/L 99.100 Prepared & Analyzed: 09/23/21 5.0 mg/L 100.00 99.1 77.1-110 96.900 Prepared & Analyzed: 09/23/21 5.0 mg/L 100.00 96.9 77.1-110 2.24 Source: E213906-01 Prepared & Analyzed: 09/23/21 28.800 5.0 mg/L 26.900 6.82 3.5000 Prepared & Analyzed: 09/23/21 5.0 mg/L 5.0000 70.0 57.1-130 RPD Limit Notes U 10 10 MRL-2, U Page 6 of 7 E213907 CNA FINAL 10 01 21 0912 10/1/21 9:12 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman U MRL-2 Notes and Definitions for QC Samples The analyte was not detected at or above the reporting limit. MRL verification for Non-Potable Water matrix Page 7 of 7 E213907 CNA FINAL 10 01 21 0912 10/1/21 9:12 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman October 1, 2021 MEMORANDUM SUBJECT: FROM: THRU: TO: FINAL Analytical Report Project: 21-0362, Gunnison POTW Laura Ackerman LSB Inorganic Chemistry Section Chief John Deatrick, Chief Laboratory Services Branch Christopher McHugh Attached are the final results for the analytical groups listed below. This report shall not be reproduced except in full without approval of the Region 4 laboratory. These analyses were performed in accordance with the Laboratory Services Branch's Laboratory Operations and Quality Assurance Manual (LSB LOQAM) found at www.epa.gov/region4/sesd/asbsop. Any unique project data quality objectives specified in writing by the data requestor have also been incorporated into the data unless otherwise noted in the Report Narrative. Chemistry data have been verified based on the LSB LOQAM specifications and have been qualified by this laboratory if the applicable quality control criteria were not met. Verification is defined in Chapter 5 of the LSB LOQAM. For a listing of specific data qualifiers and explanations, please refer to the Data Qualifier Definitions included in this report. The reported results are accurate within the limits of the method(s) and are representative only of the samples as received by the laboratory. Analyses Included in this report: Method Used: Accreditations: Classical/Nutrient Analyses (CNA) Demand SM 5210B (Water) ISO Page 1 of 7 E213907 CNA FINAL 10 01 21 0916 10/1/21 9:16 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Sample Disposal Policy Due to limited space for long term sample storage, LSB's policy is to dispose of samples on a periodic schedule. Air samples collected in summa canisters will be disposed of 30 days following the issuance of this report. All other sample media including original samples, sample extracts and or digestates will be disposed of, in accordance with applicable regulations, 60 days from the date of this report. This sample disposal policy does not apply to criminal samples which are held until the laboratory is notified by the criminal investigators that case development and litigation are complete. These samples may be held in the laboratory's custody for a longer period of time. If samples require storage beyond the 60-day period, please contact the Sample Control Coordinator by e-mail at R4SampleCustody@epa.gov. Page 2 of 7 E213907 CNA FINAL 10 01 21 0916 10/1/21 9:16 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman SAMPLES INCLUDED IN THIS REPORT Project: 21-0362, Gunnison POTW Sample ID 21-0362-0001 Laboratory ID E213907-01 Matrix Wastewater Date Collected 9/21/21 10:40 Date Received 9/23/21 7:45 Page 3 of 7 E213907 CNA FINAL 10 01 21 0916 10/1/21 9:16 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman DATA QUALIFIER DEFINITIONS A The analyte was analyzed in replicate. Reported value is an average value of the replicates. ACRONYMS AND ABBREVIATIONS CAS Chemical Abstracts Service Note: Analytes with no known CAS identifiers have been assigned codes beginning with "E", the EPA ID as assigned by the EPA Substance Registry System (www.epa.gov/srs), or beginning with "R4-", a unique identifier assigned by the EPA Region 4 laboratory. MDL Method Detection Limit - The minimum concentration of a substance (an analyte) that can be measured and reported with a 99% confidence that the analyte concentration is greater than zero. MRL Minimum Reporting Limit - Analyte concentration that corresponds to the lowest demonstrated level of acceptable quantitation. The MRL is sample-specific and accounts for preparation weights and volumes, dilutions, and moisture content of soil/sediments. TIC Tentatively Identified Compound - An analyte identified based on a match with the instrument software's mass spectral library. A calibration standard has not been analyzed to confirm the compound's identification or the estimated concentration reported. ACCREDITATIONS: ISO Accredited to ISO/IEC 17025:2017 and accreditation requirements for Forensic Science Testing Laboratories. Refer to the certificate and scope of accreditation FT-0330 at: http://www.epa.gov/aboutepa/about-region-4s-science-and-ecosystem-support-division-sesd NR Not accredited for this test. DW Accredited for conformance with ISO/IEC 17025:2017 and testing elements in the Fifth Edition of the Manual for the Certification of Laboratories Analyzing Drinking Water, EPA 815-R-05-004, 2005. Refer to the certificate and scope of accreditation AT-2628 at: http://www.epa.gov/aboutepa/about-region-4s-science-and-ecosystem-support-division-sesd ISO/DW Accredited to ISO/IEC 17025:2017 and accreditation requirements for Forensic Science Testing Labs, and conformance with ISO/IEC 17025:2017 and testing elements in the Manual for the Certification of Laboratories Analyzing Drinking Water. Page 4 of 7 E213907 CNA FINAL 10 01 21 0916 10/1/21 9:16 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Project: 21-0362, Gunnison POTW Classical/Nutrient Analyses Sample ID: 21-0362-0001 Station ID: EFF001 Date Collected: 9/21/21 10:40 CAS Number Analyte Lab ID: E213907-01 Matrix: Wastewater Results Qualifiers Units MRL Prepared Analyzed Method E1640606 BOD, 5 Day 89 A mg/L 9/23/21 2.0 9:46 9/28/21 10:45 SM 5210B Page 5 of 7 E213907 CNA FINAL 10 01 21 0916 10/1/21 9:16 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Analyte Batch 2109048 - C SM5210 BOD Blank (2109048-BLK1) SM 5210B BOD, 5 Day Classical/Nutrient Analyses (CNA) - Quality Control US-EPA, Region 4, LSASD Result Reporting Limit Units Spike Source %REC Level Result %REC Limits RPD Prepared: 09/23/21 Analyzed: 09/28/21 U 2.0 mg/L RPD Limit Notes U LCS (2109048-BS1) SM 5210B BOD, 5 Day Prepared: 09/23/21 Analyzed: 09/28/21 173.00 2.0 mg/L 198.00 87.4 84.6-115.4 A Page 6 of 7 E213907 CNA FINAL 10 01 21 0916 10/1/21 9:16 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Notes and Definitions for QC Samples U The analyte was not detected at or above the reporting limit. A The analyte was analyzed in replicate. Reported value is an average value of the replicates. Page 7 of 7 E213907 CNA FINAL 10 01 21 0916 10/1/21 9:16 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman October 12, 2021 MEMORANDUM SUBJECT: FROM: THRU: TO: FINAL Analytical Report Project: 21-0362, Gunnison POTW Laura Ackerman LSB Inorganic Chemistry Section Chief John Deatrick, Chief Laboratory Services Branch Christopher McHugh Attached are the final results for the analytical groups listed below. This report shall not be reproduced except in full without approval of the Region 4 laboratory. These analyses were performed in accordance with the Laboratory Services Branch's Laboratory Operations and Quality Assurance Manual (LSB LOQAM) found at www.epa.gov/region4/sesd/asbsop. Any unique project data quality objectives specified in writing by the data requestor have also been incorporated into the data unless otherwise noted in the Report Narrative. Chemistry data have been verified based on the LSB LOQAM specifications and have been qualified by this laboratory if the applicable quality control criteria were not met. Verification is defined in Chapter 5 of the LSB LOQAM. For a listing of specific data qualifiers and explanations, please refer to the Data Qualifier Definitions included in this report. The reported results are accurate within the limits of the method(s) and are representative only of the samples as received by the laboratory. Analyses Included in this report: Method Used: Accreditations: Classical/Nutrient Analyses (CNA) Ammonia as N EPA 350.1 (Water) ISO Page 1 of 7 E213907 CNA FINAL 10 12 21 1550 10/12/21 15:50 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Sample Disposal Policy Due to limited space for long term sample storage, LSB's policy is to dispose of samples on a periodic schedule. Air samples collected in summa canisters will be disposed of 30 days following the issuance of this report. All other sample media including original samples, sample extracts and or digestates will be disposed of, in accordance with applicable regulations, 60 days from the date of this report. This sample disposal policy does not apply to criminal samples which are held until the laboratory is notified by the criminal investigators that case development and litigation are complete. These samples may be held in the laboratory's custody for a longer period of time. If samples require storage beyond the 60-day period, please contact the Sample Control Coordinator by e-mail at R4SampleCustody@epa.gov. Page 2 of 7 E213907 CNA FINAL 10 12 21 1550 10/12/21 15:50 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman SAMPLES INCLUDED IN THIS REPORT Project: 21-0362, Gunnison POTW Sample ID 21-0362-0001 Laboratory ID E213907-01 Matrix Wastewater Date Collected 9/21/21 10:40 Date Received 9/23/21 7:45 Page 3 of 7 E213907 CNA FINAL 10 12 21 1550 10/12/21 15:50 None UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman DATA QUALIFIER DEFINITIONS ACRONYMS AND ABBREVIATIONS CAS Chemical Abstracts Service Note: Analytes with no known CAS identifiers have been assigned codes beginning with "E", the EPA ID as assigned by the EPA Substance Registry System (www.epa.gov/srs), or beginning with "R4-", a unique identifier assigned by the EPA Region 4 laboratory. MDL Method Detection Limit - The minimum concentration of a substance (an analyte) that can be measured and reported with a 99% confidence that the analyte concentration is greater than zero. MRL Minimum Reporting Limit - Analyte concentration that corresponds to the lowest demonstrated level of acceptable quantitation. The MRL is sample-specific and accounts for preparation weights and volumes, dilutions, and moisture content of soil/sediments. TIC Tentatively Identified Compound - An analyte identified based on a match with the instrument software's mass spectral library. A calibration standard has not been analyzed to confirm the compound's identification or the estimated concentration reported. ACCREDITATIONS: ISO Accredited to ISO/IEC 17025:2017 and accreditation requirements for Forensic Science Testing Laboratories. Refer to the certificate and scope of accreditation FT-0330 at: http://www.epa.gov/aboutepa/about-region-4s-science-and-ecosystem-support-division-sesd NR Not accredited for this test. DW Accredited for conformance with ISO/IEC 17025:2017 and testing elements in the Fifth Edition of the Manual for the Certification of Laboratories Analyzing Drinking Water, EPA 815-R-05-004, 2005. Refer to the certificate and scope of accreditation AT-2628 at: http://www.epa.gov/aboutepa/about-region-4s-science-and-ecosystem-support-division-sesd ISO/DW Accredited to ISO/IEC 17025:2017 and accreditation requirements for Forensic Science Testing Labs, and conformance with ISO/IEC 17025:2017 and testing elements in the Manual for the Certification of Laboratories Analyzing Drinking Water. Page 4 of 7 E213907 CNA FINAL 10 12 21 1550 10/12/21 15:50 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Project: 21-0362, Gunnison POTW Classical/Nutrient Analyses Sample ID: 21-0362-0001 Station ID: EFF001 Date Collected: 9/21/21 10:40 CAS Number Analyte Lab ID: E213907-01 Matrix: Wastewater Results Qualifiers Units MRL Prepared Analyzed Method 7664-41-7 Ammonia as N 1.6 mg/L 0.050 9/28/21 9/30/21 EPA 350.1 16:28 12:44 Page 5 of 7 E213907 CNA FINAL 10 12 21 1550 10/12/21 15:50 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman Analyte Batch 2109051 - C 350.1 Ammonia Blank (2109051-BLK1) EPA 350.1 Ammonia as N Classical/Nutrient Analyses (CNA) - Quality Control US-EPA, Region 4, LSASD Result Reporting Limit Units Spike Source %REC Level Result %REC Limits RPD Prepared: 09/28/21 Analyzed: 09/30/21 U 0.050 mg/L RPD Limit Notes U LCS (2109051-BS1) EPA 350.1 Ammonia as N 0.98400 Prepared: 09/28/21 Analyzed: 09/30/21 0.050 mg/L 1.0000 98.4 90-110 Matrix Spike (2109051-MS1) EPA 350.1 Ammonia as N Source: E213907-01 2.6370 0.050 mg/L Prepared: 09/28/21 Analyzed: 09/30/21 1.0000 1.6490 98.8 90-110 Matrix Spike Dup (2109051-MSD1) EPA 350.1 Ammonia as N Source: E213907-01 Prepared: 09/28/21 Analyzed: 09/30/21 2.6280 0.050 mg/L 1.0000 1.6490 97.9 90-110 0.342 10 MRL Verification (2109051-PS1) EPA 350.1 Ammonia as N 0.035000 Prepared: 09/28/21 Analyzed: 09/30/21 0.050 mg/L 0.050000 70.0 70-130 MRL-2, U Page 6 of 7 E213907 CNA FINAL 10 12 21 1550 10/12/21 15:50 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 4 Laboratory Services and Applied Science Division 980 College Station Road, Athens, Georgia 30605-2700 D.A.R.T. Id: 21-0362 Project: 21-0362, Gunnison POTW - Reported by Laura Ackerman U MRL-2 Notes and Definitions for QC Samples The analyte was not detected at or above the reporting limit. MRL verification for Non-Potable Water matrix Page 7 of 7 E213907 CNA FINAL 10 12 21 1550 10/12/21 15:50