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Home My WebLink AboutDDW-2025-003843Rio Tinto Kennecott 4700 Daybreak Parkway South Jordan, Utah 84009 T (801) 304-1256 M (385) 246-7937 E-mail trevor.paulson@riotinto.com Trevor Paulson Senior Advisor – Water April 8, 2025 DDWreports@utah.gov Utah Division of Drinking Water Via e-mail Subject: First Quarter 2025 Point of Use Treatment Report Kennecott Section 21 Public Water System 18003, (File #06826) In accordance with Kennecott Utah Copper’s Operation Permit (File #06826) issued on January 10, 2006, enclosed is the First Quarter 2025 Point of Use Treatment and Monitoring Report for arsenic for the Section 21 Public Water System 18003. Seven Reverse Osmosis (RO) treatment units were sampled and analyzed for arsenic during this reporting period. Sincerely, Trevor Paulson Senior Advisor – Water Attachments (8) Operation - RO Filter Sample Date Results ug/L mho/cm Days January-25 February-25 March-25 Central Lab CL1 02/12/25 < 5 12 154 20 14 20 Administration Upstairs RF2 02/12/25 < 5 115 182 111 113 139 Precious Metals Lunch Room RF6 270 267 262 2nd Floor West Admin Break room SM1 02/12/25 < 5 146 36 197 175 180 2nd Floor Admin 264 SM2 02/12/25 < 5 212 141 239 199 201 Hot Metals - Reliability Shop SM5 02/12/25 < 5 180 251 201 192 203 EDX Building Lunchroom SM11 248 240 242 Hot Metals - Materials Handling SM17 124 177 180 Anodes Office - Trailer SM18 145 197 200 Smelter Women's Change Room SM20 424 424 444 Smelter Men's Change Room SM21 247 246 200 Materials Handling Shop SM36 183 288 280 Filter Plant Lunchroom SM39 177 202 201 Records Building SM41 192 233 230 Garage SM42 270 272 273 Contractors Lunchroom SM43 240 241 241 MEIT Shop SM44 262 260 264 Engineering East SM46 155 117 Removed Engineering West SM47 59 60 65 Hot Metals Bldg 3rd Fl Sou End SM52 200 184 185 Admin Northwest SM51 390 455 200 Admin North East SM50 120 125 127 3rd Floor So End Hot Metal ice machine SM53 126 116 117 North Tailings Administration NT54 273 274 148 Refinery Gym RF7 274 280 286 Sample Prep CL2 02/12/25 < 5 230 130 209 210 298 Sample Prep RO CL3 02/12/25 < 5 336 130 205 212 243 Machine Location & Description Arsenic and Conductivity Conductivity Results (mho/cm)/Maintenance Conducted Kennecott Section 21 System 18003 First Quarter 2025 POU Arsenic Report RTKC ID Kennecott Environmental Laboratory Certificate of Analysis ---March 11, 2025 Well Designation: Collection Date: Submission Date: 02/12/2025 02/13/2025 Page 1 of 7 9180 W 2500 S Magna, UT 84044 Phone (801) 569-7952 CL1 T JA02365KEL Sample ID Numbers: Total Dissolved Metals Metals CRDL Result Unit Method Analyte Result *Micro mho/cm 1* Conductivity (Field) 12 ug/L 5Arsenic 200.8 < 5 * =Included for information purposes only, not performed by KEL. NA = Not Analyzed The Contract Required Detection Limits (CRDL) are minimum reporting limits required by the Ground Water Characterization and Monitoring Plan (GCMP) Kennecott Environmental Laboratory Certificate of Analysis ---March 11, 2025 Well Designation: Collection Date: Submission Date: 02/12/2025 02/13/2025 Page 2 of 7 9180 W 2500 S Magna, UT 84044 Phone (801) 569-7952 CL2 T JA02366KEL Sample ID Numbers: Total Dissolved Metals Metals CRDL Result Unit Method Analyte Result *Micro mho/cm 1* Conductivity (Field) 230 ug/L 5Arsenic 200.8 < 5 * =Included for information purposes only, not performed by KEL. NA = Not Analyzed The Contract Required Detection Limits (CRDL) are minimum reporting limits required by the Ground Water Characterization and Monitoring Plan (GCMP) Kennecott Environmental Laboratory Certificate of Analysis ---March 11, 2025 Well Designation: Collection Date: Submission Date: 02/12/2025 02/13/2025 Page 3 of 7 9180 W 2500 S Magna, UT 84044 Phone (801) 569-7952 CL3 T JA02367KEL Sample ID Numbers: Total Dissolved Metals Metals CRDL Result Unit Method Analyte Result *Micro mho/cm 1* Conductivity (Field) 336 ug/L 5Arsenic 200.8 < 5 * =Included for information purposes only, not performed by KEL. NA = Not Analyzed The Contract Required Detection Limits (CRDL) are minimum reporting limits required by the Ground Water Characterization and Monitoring Plan (GCMP) Kennecott Environmental Laboratory Certificate of Analysis ---March 11, 2025 Well Designation: Collection Date: Submission Date: 02/12/2025 02/13/2025 Page 4 of 7 9180 W 2500 S Magna, UT 84044 Phone (801) 569-7952 RF2 T JA02368KEL Sample ID Numbers: Total Dissolved Metals Metals CRDL Result Unit Method Analyte Result *Micro mho/cm 1* Conductivity (Field) 115 ug/L 5Arsenic 200.8 < 5 * =Included for information purposes only, not performed by KEL. NA = Not Analyzed The Contract Required Detection Limits (CRDL) are minimum reporting limits required by the Ground Water Characterization and Monitoring Plan (GCMP) Kennecott Environmental Laboratory Certificate of Analysis ---March 11, 2025 Well Designation: Collection Date: Submission Date: 02/12/2025 02/13/2025 Page 5 of 7 9180 W 2500 S Magna, UT 84044 Phone (801) 569-7952 SM1 T JA02370KEL Sample ID Numbers: Total Dissolved Metals Metals CRDL Result Unit Method Analyte Result *Micro mho/cm 1* Conductivity (Field) 146 ug/L 5Arsenic 200.8 < 5 * =Included for information purposes only, not performed by KEL. NA = Not Analyzed The Contract Required Detection Limits (CRDL) are minimum reporting limits required by the Ground Water Characterization and Monitoring Plan (GCMP) Kennecott Environmental Laboratory Certificate of Analysis ---March 11, 2025 Well Designation: Collection Date: Submission Date: 02/12/2025 02/13/2025 Page 6 of 7 9180 W 2500 S Magna, UT 84044 Phone (801) 569-7952 SM2 T JA02371KEL Sample ID Numbers: Total Dissolved Metals Metals CRDL Result Unit Method Analyte Result *Micro mho/cm 1* Conductivity (Field) 212 ug/L 5Arsenic 200.8 < 5 * =Included for information purposes only, not performed by KEL. NA = Not Analyzed The Contract Required Detection Limits (CRDL) are minimum reporting limits required by the Ground Water Characterization and Monitoring Plan (GCMP) Kennecott Environmental Laboratory Certificate of Analysis ---March 11, 2025 Well Designation: Collection Date: Submission Date: 02/12/2025 02/13/2025 Page 7 of 7 9180 W 2500 S Magna, UT 84044 Phone (801) 569-7952 SM5 T JA02369KEL Sample ID Numbers: Total Dissolved Metals Metals CRDL Result Unit Method Analyte Result *Micro mho/cm 1* Conductivity (Field) 180 ug/L 5Arsenic 200.8 < 5 * =Included for information purposes only, not performed by KEL. NA = Not Analyzed The Contract Required Detection Limits (CRDL) are minimum reporting limits required by the Ground Water Characterization and Monitoring Plan (GCMP)