Attachment_6_-_Annual_Groundwater_Monitoring_Report_2025.pdf

2025 Groundwater Report for the National Park Service – Grand Teton National Park

FINAL REPORT

November 24, 2025

2025 ANNUAL GROUNDWATER MONITORING REPORT

FOR NATIONAL PARK SERVICE – GRAND TETON NATIONAL PARK

Prepared for: NPS, IMR – Northern Rockies MABO ATTN: Sharon LaRosa P.O. Box 168 Mammoth Supply Center 22 Stable St.

Yellowstone NP, WY 82190

Prepared by: WWC Engineering

1275 Maple Street, Suite F Helena, MT 59601

(406) 443-3962

Principal Author: Ben Osborn, Staff Scientist, Project Manager

Reviewed by: Scott Payne, PhD, P.G., Principal Scientist, Project Manager Kevin Grabinski, P.E., Environmental Department Manager

3.1 Methods

3.2 Quality Assurance/Quality Control

5.1 Permit Limit Exceedances

5.2 Non-Permit Water Quality Exceedance

5.3 Presence of Bacteria and Other Observances

5.4 Formaldehyde Samples

3.1 METHODS

3.2 QUALITY ASSURANCE/QUALITY CONTROL

5.1 PERMIT LIMIT EXCEEDANCES

5.2 NON-PERMIT WATER QUALITY EXCEEDANCE

5.3 PRESENCE OF BACTERIA AND OTHER OBSERVANCES

5.4 FORMALDEHYDE SAMPLES

Site Well Sample ID DEQ permit well name DEQ facility name Date & Time NA Blank 0520-GTNP-101 NA NA 5/20/2025 8:00 AMK Ranch MW-2 0520-GTNP-102 MW-2 Septic System (AMK Ranch) (WYS-039-00204) 5/20/2025 8:30 NA Duplicate 0520-GTNP-103 NA NA 5/20/2025 9:00 AMK Ranch MW-3 0520-GTNP-104 MW-3 Septic System (AMK Ranch) (WYS-039-00204) 5/20/2025 9:30 AMK Ranch MW-1 0520-GTNP-105 MW-1 Septic System (AMK Ranch) (WYS-039-00204) 5/20/2025 10:00 Moran Junction MW-2 0520-GTNP-106 MW-2 (downgradient) Septic System (Moran Junction employee services) (WYS-039-058) 5/20/2025 10:30 NA Duplicate 0520-GTNP-107 NA NA 5/20/2025 11:00 S. Jenny Lake MW-4 0520-GTNP-108 Not in GEM, not a permit mo NA 5/20/2025 11:30 NA Duplicate 0520-GTNP-109 NA NA 5/20/2025 12:00 S. Jenny Lake MW-5 -- MW-5 (downgradient) Septic System (South Jenny Lake) (WYS-039-00163) -- Lupine Meadows LM-NE -- MW-3 Septic System (GT NP Lupine Meadows W Housing) (WYS-039-093 ) -- Lupine Meadows LM-SE 0520-GTNP-110 MW-1 Septic System (GT NP Lupine Meadows W Housing) (WYS-039-093 ) 5/20/2025 12:30 NA Duplicate 0520-GTNP-111 NA 5/20/2025 13:00 Lupine Meadows LM-W -- MW-2 Septic System (GT NP Lupine Meadows W Housing) (WYS-039-093 ) -- Moose Junction MV-1 0520-GTNP-112 Monitor Well 1 WWTP (Grand Teton - Moose Treatment Plant) (WYS-039-078 ) 5/20/2025 13:30 NA Duplicate 0520-GTNP-113 NA NA 5/20/2025 14:00 Moose Junction MV-3 0520-GTNP-114 Not in GEM, not a permit mo NA 5/20/2025 14:30 NA Blank 0521-GTNP-115 NA 5/21/2025 8:00 Moose Junction MV-2 0521-GTNP-116 Monitor Well 2 WWTP (Grand Teton - Moose Treatment Plant) (WYS-039-078 ) 5/21/2025 8:20 Moose Junction MV-5 0521-GTNP-117 Monitor Well 5 WWTP (Grand Teton - Moose Treatment Plant) (WYS-039-078 ) 5/21/2025 8:40 Moose Junction MV-4 0521-GTNP-118 Monitor Well 4 WWTP (Grand Teton - Moose Treatment Plant) (WYS-039-078 ) 5/21/2025 9:00 Beaver Creek BC-2 0521-GTNP-119 Not in GEM, not a permit mo NA 5/21/2025 9:20 NA Duplicate 0521-GTNP-120 NA NA 5/21/2025 9:40 Beaver Creek BC-5 (2012) 0521-GTNP-121-01 MW 2012-3 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 5/21/2025 10:00 Beaver Creek BC1 0521-GTNP-121 Not in GEM, not a permit mo NA 5/21/2025 10:20 Beaver Creek BC3 LFNW 0521-GTNP-122 BC-3 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 5/21/2025 10:40 Beaver Creek BC4 LFSW 0521-GTNP-123 BC-4 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 5/21/2025 11:00 Beaver Creek BC1 LFSE 0521-GTNP-124 BC-1 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 5/21/2025 11:20 Beaver Creek BC2 LFNE 0521-GTNP-125 BC-2 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 5/21/2025 11:40 Gros Ventre GV-11 0521-GTNP-126 MW-GV11 Septic System (Grand Teton NP Gros Ventre Campground) (WYS-039-018) 5/21/2025 12:00 Gros Ventre GV-12 0521-GTNP-127 MW-GV12 Septic System (Grand Teton NP Gros Ventre Campground) (WYS-039-018) 5/21/2025 12:20 NA Duplicate 0521-GTNP-128 NA NA 5/21/2025 12:40 Gros Ventre GV-10 0521-GTNP-129 Not in GEM, not a permit mo NA 5/21/2025 13:00 Gros Ventre GV-6 0521-GTNP-130 MW-GV6 Septic System (Grand Teton NP Gros Ventre Campground) (WYS-039-018) 5/21/2025 13:20 Gros Ventre GV-9 0521-GTNP-131 MW-GV9 Septic System (Grand Teton NP Gros Ventre Campground) (WYS-039-018) 5/21/2025 13:40

Permit limits

Site Well Sample ID DEQ permit well name DEQ facility name Date & Time

Depth to water from TOC (ft)

NA Blank 0909-GTNP-101 NA NA 9/9/2025 8:00 -- Moose Junction MV-1 0909-GTNP-102 Monitor Well 1 WWTP (Grand Teton - Moose Treatment Plant) (WYS-039-078 ) 9/9/2025 8:20 18.11 Moose Junction MV-3 0909-GTNP-103 Not in GEM, not a permit monitoring site NA 9/9/2025 8:40 13.21 Moose Junction MV-2 0909-GTNP-104 Monitor Well 2 WWTP (Grand Teton - Moose Treatment Plant) (WYS-039-078 ) 9/9/2025 9:00 17.31 Moose Junction MV-5 0909-GTNP-105 Monitor Well 5 WWTP (Grand Teton - Moose Treatment Plant) (WYS-039-078 ) 9/9/2025 9:20 23.18 Moose Junction MV-4 0909-GTNP-106 Monitor Well 4 9/9/2025 9:40 23.01 S. Jenny Lake MW-4 0909-GTNP-107 Not in GEM, not a permit monitoring site NA 9/9/2025 10:00 25.78 S. Jenny Lake MW-5 -- MW-5 (downgradient) Septic System (South Jenny Lake) (WYS-039-00163) -- --

Lupine Meadows LM-NE -- MW-3 Septic System (GT NP Lupine Meadows W Housing) (WYS-039-093 ) -- -- Lupine Meadows LM-SE 0909-GTNP-108 MW-1 Septic System (GT NP Lupine Meadows W Housing) (WYS-039-093 ) 9/9/2025 10:20 53.77 Lupine Meadows LM-W -- MW-2 Septic System (GT NP Lupine Meadows W Housing) (WYS-039-093 ) -- -- Beaver Creek BC-2 -- Not in GEM, not a permit monitoring site NA -- -- Beaver Creek BC-5 (2012) 0909-GTNP-109 MW 2012-3 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 9/9/2025 10:40 41.14 Beaver Creek BC1 -- Not in GEM, not a permit monitoring site NA -- -- Beaver Creek BC3 LFNW 0909-GTNP-110 BC-3 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 9/9/2025 11:00 76.67 Beaver Creek BC4 LFSW 0909-GTNP-111 BC-4 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 9/9/2025 11:20 74.93 Beaver Creek BC1 LFSE 0909-GTNP-112 BC-1 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 9/9/2025 11:40 73.42 Beaver Creek BC2 LFNE 0909-GTNP-113 BC-2 Septic System (Beaver Creek Employee Housing) (WYS-039-013) 9/9/2025 12:00 73.77 NA Blank 0910-GTNP-114 NA NA 9/10/2025 8:00 -- Flagg Ranch FR-8S 0910-GTNP-115 Not in GEM, not a permit monitoring site NA 9/10/2025 8:30 30.31 Flagg Ranch FR-8S Duplicat 0910-GTNP-116 Not in GEM, not a permit monitoring site NA 9/10/2025 9:00 -- Flagg Ranch FR-3 0910-GTNP-117 Not in GEM, not a permit monitoring site NA 9/10/2025 9:30 27.24 Flagg Ranch FR-5 0910-GTNP-118 Not in GEM, not a permit monitoring site NA 9/10/2025 10:00 31.46 Flagg Ranch FR-6 0910-GTNP-119 Not in GEM, not a permit monitoring site NA 9/10/2025 10:30 36.38 Flagg Ranch FR-9 0910-GTNP-120 Not in GEM, not a permit monitoring site NA 9/10/2025 11:00 36.61 AMK Ranch MW-2 0910-GTNP-121 MW-2 Septic System (AMK Ranch) (WYS-039-00204) 9/10/2025 11:30 30.74 AMK Ranch MW-3 0910-GTNP-122 MW-3 Septic System (AMK Ranch) (WYS-039-00204) 9/10/2025 12:00 24.41 AMK Ranch MW-1 0910-GTNP-123 MW-1 Septic System (AMK Ranch) (WYS-039-00204) 9/10/2025 12:30 36.94 Moran Junction MW-2 0910-GTNP-124 MW-2 (downgradient) Septic System (Moran Junction employee services) (WYS-039-058) 9/10/2025 13:00 18.29 NA Blank 0911-GTNP-125 NA NA 9/11/2025 8:00 -- Colter Bay CB-1 0911-GTNP-126 Not in GEM, not a permit monitoring site NA 9/11/2025 8:30 12.33 Colter Bay CB-1 Duplicate0911-GTNP-127 Not in GEM, not a permit monitoring site NA 9/11/2025 9:00 -- Colter Bay CB-7 0911-GTNP-128 Not in GEM, not a permit monitoring site NA 9/11/2025 9:30 4.35 Colter Bay CB-5S 0911-GTNP-129 Not in GEM, not a permit monitoring site NA 9/11/2025 10:00 3.84 Signal Mountain SM-5 0911-GTNP-130 Not in GEM, not a permit monitoring site NA 9/11/2025 10:30 99.49 Signal Mountain SM-5 Duplicate0911-GTNP-131 Not in GEM, not a permit monitoring site NA 9/11/2025 11:00 -- Signal Mountain SM-1 -- Not in GEM, not a permit monitoring site NA -- -- Signal Mountain SM-2 -- Not in GEM, not a permit monitoring site NA -- -- Gros Ventre GV-11 -- MW-GV11 Septic System (Grand Teton NP Gros Ventre Campground) (WYS-039-018) -- -- Gros Ventre GV-12 0911-GTNP-132 MW-GV12 Septic System (Grand Teton NP Gros Ventre Campground) (WYS-039-018) 9/11/2025 11:30 18.73 Gros Ventre GV-10 0911-GTNP-133 Not in GEM, not a permit monitoring site NA 9/11/2025 12:00 21.01 Gros Ventre GV-6 0911-GTNP-134 MW-GV6 Septic System (Grand Teton NP Gros Ventre Campground) (WYS-039-018) 9/11/2025 12:30 27.73 Gros Ventre GV-9 0911-GTNP-135 MW-GV9 Septic System (Grand Teton NP Gros Ventre Campground) (WYS-039-018) 9/11/2025 13:00 28.48

Permit limits NA

ANALYTICAL SUMMARY REPORT

The analyses presented in this report were performed by Energy Laboratories, Inc., 3161 E. Lyndale Ave., Helena, MT 59604, unless otherwise noted. Any exceptions or problems with the analyses are noted in the report package. Any issues encountered during sample receipt are documented in the Work Order Receipt Checklist.

The results as reported relate only to the item(s) submitted for testing. This report shall be used or copied only in its entirety. Energy Laboratories, Inc. is not responsible for the consequences arising from the use of a partial report.

Lab ID Client Sample ID Collect Date Receive Date Matrix Test

H25050627-001 0520-GTNP-101 05/20/25 8:00 05/21/25 Aqueous Bacteria, Private Water Supply Services Provided by Lab Anions by Ion Chromatography Nitrogen, Ammonia Nitrogen, Nitrate + Nitrite Preparation, Dissolved Filtration

MCAWW

Phosphorus, Orthophosphate as P

H25050627-002 0520-GTNP-102 05/20/25 8:30 05/21/25 Aqueous Same As Above

H25050627-003 0520-GTNP-103 05/20/25 9:00 05/21/25 Aqueous Same As Above

H25050627-004 0520-GTNP-104 05/20/25 9:30 05/21/25 Aqueous Same As Above

H25050627-005 0520-GTNP-105 05/20/25 10:00 05/21/25 Aqueous Same As Above

H25050627-006 0520-GTNP-106 05/20/25 10:30 05/21/25 Aqueous Same As Above

H25050627-007 0520-GTNP-107 05/20/25 11:00 05/21/25 Aqueous Same As Above

H25050627-008 0520-GTNP-108 05/20/25 11:30 05/21/25 Aqueous Bacteria, Private Water Supply Anions by Ion Chromatography Nitrogen, Ammonia Nitrogen, Nitrate + Nitrite

H25050627-009 0520-GTNP-109 05/20/25 12:00 05/21/25 Aqueous Same As Above

H25050627-010 0520-GTNP-110 05/20/25 12:30 05/21/25 Aqueous Bacteria, Private Water Supply Services Provided by Lab Anions by Ion Chromatography Nitrogen, Ammonia Nitrogen, Nitrate + Nitrite Preparation, Dissolved Filtration

MCAWW

Phosphorus, Orthophosphate as P

H25050627-011 0520-GTNP-111 05/20/25 13:00 05/21/25 Aqueous Same As Above

H25050627-012 0520-GTNP-112 05/20/25 13:30 05/21/25 Aqueous Same As Above

H25050627-013 0520-GTNP-113 05/20/25 14:00 05/21/25 Aqueous Same As Above

H25050627-014 0520-GTNP-114 05/20/25 14:30 05/21/25 Aqueous Same As Above

Kirk Eng.and Natural Rsrcs Inc

Project Name: GTNP

Work Order: H25050627

PO Box 636

Sheridan, MT 59749-0636

June 03, 2025

H2205Quote ID:

Energy Laboratories Inc Helena MT received the following 14 samples for Kirk Eng.and Natural Rsrcs Inc on 5/21/2025 for analysis.

Energy Laboratories, Inc. verifies the reported results for the analysis has been technically reviewed and approved for release.

If you have any questions regarding these test results, please contact your Project Manager.

Digitally signed by Jessica C. Smith Date: 2025.06.03 12:53:45 -06:00

Project: GTNP

CLIENT: Kirk Eng.and Natural Rsrcs Inc

Work Order: H25050627 CASE NARRATIVE

06/03/25Report Date:

This analysis confirmed the presence of coliform bacteria. Such bacterial growth indicates the water supply is or was being contaminated by some outside source. If E-Coli bacteria was found in your water sample, their presence will be indicated as "present" on your analytical report. E-Coli contamination indicates your water supply is or has been in contact with human or animal sewage.

There are many probable reasons why a water supply becomes contaminated. Perhaps you have done work on the pump or repaired a line. Surface drainage has perhaps influenced a shallow well. In any case, the water system should be disinfected to eliminate all bacterial growth.

DISINFECTION PROCEDURE

STEP 1: Calculate the depth of water in the well by subtracting the non-pumping (static) water level in the well from the depth of the well.

STEP 2: Using the table below, mix the amount given with water before adding to the well casing at the rate of 1 cup or less per 5 gallons of clear water; 2 cups to 1 quart in 10 gallons of clear water, to achieve the proper chlorine concentration in the well (approximately 100 mg/L). A high concentration of chlorine may void the warranty on the pump. Check with your supplier if concerned.

Depth of water in Well* (ft) 4"casing 6"casing 8"casing 10 ft 1 cup 1 cup 1 1/2 cups 20 ft 1 cup 1 cup 1 1/2 cups 30 ft 1 cup 2 cups 4 cups 40 ft 1 1/2 cups 2 cups 1 quart 60 ft 2 cups 4 cups 2 quarts 80 ft 2 cups 1 quart 2 quarts 100 ft 3 cups 1 1/2 qts 2 1/2 qts 150 ft 4 cups 2 1/2 qts 4 quarts

*Note: Depth of water in well is measured from the static water level to the bottom of the well.

STEP 3: Remove the well cap. Carefully pour the 5 to 10 gallon chlorine solution down the well. If available, attach a hose to an outside spigot and run the hose into the well casing and begin to circulate the water back down the well. Continue to recycle the water down the well until you can smell chlorinated water from the hose. This will ensure the chlorine solution has been thoroughly mixed in the well.

STEP 4: Once the well is disinfected, you may begin to disinfect the remainder of the system. Start at the farthest tap from the well. Turn on the COLD water tap only. (This process may be used to disinfect the HOT water as well; however, it may require multiple additions of chlorinated water to the well in order to achieve the quantity of chlorinated water required to disinfect the hot water tank). Once you can smell chlorinated water coming from the tap, you may shut it off. Follow this procedure will all cold water taps as you move back towards the well.

STEP 5: Leave the chlorine in the well and pipes for at least 24 hours to allow it to come into contact with the bacteria. DO

NOT USE THE WATER DURING THIS PERIOD!

STEP 6: After 12-24 hours, turn on an outside faucet (avoid discharging large volumes of chlorinated water into your septic system) and flush the chlorinated water from the system until the chlorine smell is no longer present. Chlorinated water may be discharged to the ground surface but it must not be allowed to make its way into a surface water.

STEP 7: 72 hours after you are no longer able to detect chlorine in your system, collect a water sample to test for coliform bacteria. This sample should be taken to determine if the disinfection process was effective. If coliform bacteria sample tests prove that the water is still unsatisfactory after disinfection, the disinfection process should be repeated until satisfactory results are obtained. If you are unable to resolve the unsatisfactory samples with a few disinfection efforts, it may indicate that there is a problem that needs to be identified and corrected, i.e. a cracked well casing or a cross connection to the system. Contact a well professional or the Montana Dept. of Environmental Quality @ 406-444-4400 or visit their website: http://www.deq.state.mt.us/wqinfo/swp/index.asp

REFERENCE: Montana Department of Environmental Quality, Public Water and Subdivisions Bureau Compliance Section

Client Sample ID: 0520-GTNP-101

Collection Date: 05/20/25 08:00

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-001A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Qualifiers:

Client Sample ID: 0520-GTNP-102

Collection Date: 05/20/25 08:30

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-002A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-103

Collection Date: 05/20/25 09:00

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-003A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-104

Collection Date: 05/20/25 09:30

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-004A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

PresentColiform, Total A9223 BUNSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-105

Collection Date: 05/20/25 10:00

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-005A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

PresentColiform, Total A9223 BUNSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-106

Collection Date: 05/20/25 10:30

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-006A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-107

Collection Date: 05/20/25 11:00

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-007A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

PresentColiform, Total A9223 BUNSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-108

Collection Date: 05/20/25 11:30

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-008A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-109

Collection Date: 05/20/25 12:00

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-009A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-110

Collection Date: 05/20/25 12:30

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-010A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

PresentColiform, Total A9223 BUNSAFE 05/21/25 11:43 / HASper 100ml

PresentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-111

Collection Date: 05/20/25 13:00

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-011A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

PresentColiform, Total A9223 BUNSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-112

Collection Date: 05/20/25 13:30

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-012A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-113

Collection Date: 05/20/25 14:00

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-013A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

Client Sample ID: 0520-GTNP-114

Collection Date: 05/20/25 14:30

Matrix: Aqueous

Client: Kirk Eng.and Natural Rsrcs Inc

Lab ID: H25050627-014A

Report Date: 06/03/25

Analyses Result QualifierSafe/Unsafe Analysis Date / ByMethod

Received Date: 05/21/25 09:30

LABORATORY ANALYTICAL REPORT

Units

Sampled By: Osborn

Prepared by Helena, MT Branch

MICROBIOLOGICAL

AbsentColiform, Total A9223 BSAFE 05/21/25 11:43 / HASper 100ml

AbsentColiform, E-Coli A9223 B 05/21/25 11:43 / HASper 100ml

Comments: The notation "SAFE" indicates that the water was bacteriologically SAFE when sampled.

The notation "UNSAFE" indicates that the water was bacteriologically UNSAFE when sampled.

LABORATORY ANALYTICAL REPORT

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-001 Collection Date: 05/20/25 08:00

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/30/25 23:47 / eer1mg/LND E300.0 IC METROHM_250529A : 144 R205641

05/29/25 13:19 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 38 R205636

05/30/25 20:35 / JAR0.01mg/LND E353.2 SEAL AA500_250530B : 277 R205684

05/21/25 13:39 / JAR0.005mg/LND E365.1 05/21/25 12:27 SEAL AA500_250521C : 19 R205413

MCL - Maximum Contaminant Level

ND - Not detected at the Reporting Limit (RL)

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-002 Collection Date: 05/20/25 08:30

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 00:02 / eer1mg/LND E300.0 IC METROHM_250529A : 145 R205641

05/29/25 13:20 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 39 R205636

05/30/25 20:36 / JAR0.01mg/L0.55 E353.2 SEAL AA500_250530B : 278 R205684

05/21/25 13:40 / JAR0.005mg/L0.032 E365.1 05/21/25 12:27 SEAL AA500_250521C : 20 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-003 Collection Date: 05/20/25 09:00

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 00:16 / eer1mg/LND E300.0 IC METROHM_250529A : 146 R205641

05/29/25 13:21 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 40 R205636

05/30/25 20:37 / JAR0.01mg/L0.54 E353.2 SEAL AA500_250530B : 279 R205684

05/21/25 13:41 / JAR0.005mg/L0.033 E365.1 05/21/25 12:27 SEAL AA500_250521C : 21 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-004 Collection Date: 05/20/25 09:30

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 00:31 / eer1mg/L2 E300.0 IC METROHM_250529A : 147 R205641

05/29/25 13:23 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 41 R205636

05/30/25 20:38 / JAR0.02mg/L4.97 E353.2 SEAL AA500_250530B : 280 R205684

05/21/25 13:42 / JAR0.005mg/L0.035 E365.1 05/21/25 12:27 SEAL AA500_250521C : 22 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-005 Collection Date: 05/20/25 10:00

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 00:45 / eer1mg/LND E300.0 IC METROHM_250529A : 148 R205641

05/29/25 13:24 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 42 R205636

05/30/25 20:42 / JAR0.01mg/L0.03 E353.2 SEAL AA500_250530B : 283 R205684

05/21/25 13:43 / JAR0.005mg/L0.033 E365.1 05/21/25 12:27 SEAL AA500_250521C : 23 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-006 Collection Date: 05/20/25 10:30

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 00:59 / eer1mg/L4 E300.0 IC METROHM_250529A : 149 R205641

05/29/25 13:27 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 45 R205636

05/30/25 20:43 / JAR0.01mg/L4.57 E353.2 SEAL AA500_250530B : 284 R205684

05/21/25 13:44 / JAR0.005mg/L0.033 E365.1 05/21/25 12:27 SEAL AA500_250521C : 24 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-007 Collection Date: 05/20/25 11:00

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 01:14 / eer1mg/L4 E300.0 IC METROHM_250529A : 150 R205641

05/29/25 13:31 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 48 R205636

05/30/25 20:44 / JAR0.01mg/L4.64 E353.2 SEAL AA500_250530B : 285 R205684

05/21/25 13:45 / JAR0.005mg/L0.033 E365.1 05/21/25 12:27 SEAL AA500_250521C : 25 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-008 Collection Date: 05/20/25 11:30

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 02:40 / eer1mg/LND E300.0 IC METROHM_250529A : 156 R205641

05/29/25 13:32 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 49 R205636

05/30/25 20:45 / JAR0.01mg/L0.79 E353.2 SEAL AA500_250530B : 286 R205684

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-009 Collection Date: 05/20/25 12:00

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 01:28 / eer1mg/LND E300.0 IC METROHM_250529A : 151 R205641

05/29/25 13:33 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 50 R205636

05/30/25 20:46 / JAR0.01mg/L0.81 E353.2 SEAL AA500_250530B : 287 R205684

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-010 Collection Date: 05/20/25 12:30

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 04:50 / eer1mg/LND E300.0 IC METROHM_250529A : 165 R205641

05/29/25 13:34 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 51 R205636

05/30/25 20:47 / JAR0.01mg/L0.11 E353.2 SEAL AA500_250530B : 288 R205684

05/21/25 13:46 / JAR0.005mg/LND E365.1 05/21/25 12:27 SEAL AA500_250521C : 26 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-011 Collection Date: 05/20/25 13:00

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 02:55 / eer1mg/LND E300.0 IC METROHM_250529A : 157 R205641

05/29/25 13:36 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 52 R205636

05/30/25 16:37 / JAR0.01mg/L0.09 E353.2 SEAL AA500_250530B : 65 R205684

05/21/25 13:47 / JAR0.005mg/LND E365.1 05/21/25 12:27 SEAL AA500_250521C : 27 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-012 Collection Date: 05/20/25 13:30

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 03:09 / eer1mg/L1 E300.0 IC METROHM_250529A : 158 R205641

05/29/25 13:37 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 53 R205636

05/30/25 16:40 / JAR0.01mg/L0.10 E353.2 SEAL AA500_250530B : 68 R205684

05/21/25 13:55 / JAR0.005mg/L0.010 E365.1 05/21/25 12:27 SEAL AA500_250521C : 33 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-013 Collection Date: 05/20/25 14:00

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 03:24 / eer1mg/L1 E300.0 IC METROHM_250529A : 159 R205641

05/29/25 13:38 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 54 R205636

05/30/25 16:41 / JAR0.01mg/L0.10 E353.2 SEAL AA500_250530B : 69 R205684

05/21/25 13:56 / JAR0.005mg/L0.010 E365.1 05/21/25 12:27 SEAL AA500_250521C : 34 R205413

MCL - Maximum Contaminant Level

Kirk Eng.and Natural Rsrcs Inc Lab ID: H25050627-014 Collection Date: 05/20/25 14:30

Report Date: 06/03/25

DateReceived: 05/21/25

Prepared by Helena, MT Branch

Result Units Analysis Date / ByRL MethodMCLQUAL Prep Date Prep Method RunID Run

Order BatchID

05/31/25 03:38 / eer1mg/LND E300.0 IC METROHM_250529A : 160 R205641

05/29/25 13:39 / JAR0.05mg/LND E350.1 SEAL AA500 II_250529A : 55 R205636

05/30/25 16:42 / JAR0.01mg/L0.12 E353.2 SEAL AA500_250530B : 70 R205684

05/21/25 13:57 / JAR0.005mg/L0.012 E365.1 05/21/25 12:27 SEAL AA500_250521C : 35 R205413

MCL - Maximum Contaminant Level

ANALYTICAL QC SUMMARY REPORT

BatchID: R205413 03-Jun-25Date:

Prepared by Helena, MT Branch

Lab ID: ICV Method: E365.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 14 Initial Calibration Verification StandardSampType:

Prep Method:Prep Info:

0.25 102 90 1100.0050 00.254

H25050627-001B, H25050627-002B, H25050627-003B, H25050627-004B, H25050627-005B, H25050627-006B, H25050627-007B, H25050627-010B, H25050627- 011B, H25050627-012B, H25050627-013B, H25050627-014B

Lab ID: LFB Method: E365.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 15 Laboratory Fortified BlankSampType:

Prep Method:Prep Info:

0.2 105 90 1100.0050 00.209

H25050627-001B, H25050627-002B, H25050627-003B, H25050627-004B, H25050627-005B, H25050627-006B, H25050627-007B, H25050627-010B, H25050627- 011B, H25050627-012B, H25050627-013B, H25050627-014B

Lab ID: MB-77895 Method: E365.1

Prep Date: 5/21/2025

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 17 Method BlankSampType:

Prep Method:Prep Info:

0.0008ND

H25050627-001B, H25050627-002B, H25050627-003B, H25050627-004B, H25050627-005B, H25050627-006B, H25050627-007B, H25050627-010B, H25050627- 011B, H25050627-012B, H25050627-013B, H25050627-014B

Lab ID: H25050627-011BMS Method: E365.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 28 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

0.2 102 90 1100.0050 0.00160.206

H25050627-001B, H25050627-002B, H25050627-003B, H25050627-004B, H25050627-005B, H25050627-006B, H25050627-007B, H25050627-010B, H25050627- 011B, H25050627-012B, H25050627-013B, H25050627-014B

Lab ID: H25050627-011BMSD Method: E365.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 29 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

0.2 102 90 110 200.0050 0.0016 0.2061 0.00.206

J - Analyte detected below quantitation limits

N - Analyte concentration was not sufficiently high to calculate RPDS - Spike Recovery outside accepted recovery limit

R - RPD outside accepted recovery limits

ND - Not Detected at the Reporting Limit

A - Analyte concentration greater than four times the spike amount

BatchID: R205413 03-Jun-25Date:

Prepared by Helena, MT Branch

Lab ID: H25050627-011BMSD Method: E365.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 29 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

H25050627-001B, H25050627-002B, H25050627-003B, H25050627-004B, H25050627-005B, H25050627-006B, H25050627-007B, H25050627-010B, H25050627- 011B, H25050627-012B, H25050627-013B, H25050627-014B

Lab ID: CCV Method: E365.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 30 Continuing Calibration Verification StandarSampType:

Prep Method:Prep Info:

0.1 103 90 1100.0050 00.103

H25050627-001B, H25050627-002B, H25050627-003B, H25050627-004B, H25050627-005B, H25050627-006B, H25050627-007B, H25050627-010B, H25050627- 011B, H25050627-012B, H25050627-013B, H25050627-014B

Lab ID: H25050634-005AMS Method: E365.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 41 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

0.2 102 90 1100.0050 0.01520.220

H25050627-001B, H25050627-002B, H25050627-003B, H25050627-004B, H25050627-005B, H25050627-006B, H25050627-007B, H25050627-010B, H25050627- 011B, H25050627-012B, H25050627-013B, H25050627-014B

Lab ID: H25050634-005AMSD Method: E365.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250521C: 42 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

0.2 102 90 110 200.0050 0.0152 0.2199 0.10.220

H25050627-001B, H25050627-002B, H25050627-003B, H25050627-004B, H25050627-005B, H25050627-006B, H25050627-007B, H25050627-010B, H25050627- 011B, H25050627-012B, H25050627-013B, H25050627-014B

J - Analyte detected below quantitation limits

N - Analyte concentration was not sufficiently high to calculate RPDS - Spike Recovery outside accepted recovery limit

R - RPD outside accepted recovery limits

ND - Not Detected at the Reporting Limit

BatchID: R205636 03-Jun-25Date:

Prepared by Helena, MT Branch

Lab ID: ICB Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 11 Method BlankSampType:

Prep Method:Prep Info:

0.02ND

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: ICV Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 12 Initial Calibration Verification StandardSampType:

Prep Method:Prep Info:

1 95 90 1100.050 00.946

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: LFB Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 13 Laboratory Fortified BlankSampType:

Prep Method:Prep Info:

1 98 90 1100.050 00.977

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: CCV Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 28 Continuing Calibration Verification StandarSampType:

Prep Method:Prep Info:

0.5 99 90 1100.050 00.493

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: H25050567-003FMS Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 32 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

1 102 80 1200.050 01.02

J - Analyte detected below quantitation limits

N - Analyte concentration was not sufficiently high to calculate RPDS - Spike Recovery outside accepted recovery limit

R - RPD outside accepted recovery limits

ND - Not Detected at the Reporting Limit

Prepared by Helena, MT Branch

Lab ID: H25050567-003FMS Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 32 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: H25050567-003FMSD Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 33 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

1 103 80 120 100.050 0 1.02 1.41.03

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: CCV Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 43 Continuing Calibration Verification StandarSampType:

Prep Method:Prep Info:

0.5 98 90 1100.050 00.492

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: H25050627-006DMS Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 46 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

1 100 80 1200.050 01.00

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: H25050627-006DMSD Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 47 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

1 103 80 120 100.050 0 1.002 2.61.03

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

J - Analyte detected below quantitation limits

N - Analyte concentration was not sufficiently high to calculate RPDS - Spike Recovery outside accepted recovery limit

R - RPD outside accepted recovery limits

ND - Not Detected at the Reporting Limit

Prepared by Helena, MT Branch

Lab ID: H25050643-001AMS Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 60 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

1 108 80 1200.050 01.08

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

Lab ID: H25050643-001AMSD Method: E350.1

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500 II_250529A: 61 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

1 105 80 120 100.050 0 1.085 3.41.05

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D, H25050627-012D, H25050627-013D, H25050627-014D

J - Analyte detected below quantitation limits

N - Analyte concentration was not sufficiently high to calculate RPDS - Spike Recovery outside accepted recovery limit

R - RPD outside accepted recovery limits

ND - Not Detected at the Reporting Limit

BatchID: R205641 03-Jun-25Date:

Prepared by Helena, MT Branch

Lab ID: ICB Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 1 Method BlankSampType:

Prep Method:Prep Info:

0.02ND

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: ICV Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 2 Initial Calibration Verification StandardSampType:

Prep Method:Prep Info:

100 99 90 1101.0 098.9

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: LFB Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 3 Laboratory Fortified BlankSampType:

Prep Method:Prep Info:

25 101 90 1101.0 025.2

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: H25050539-002AMS Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 138 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

25 112 90 110 S1.0 0.66828.7

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: H25050539-002AMSD Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 139 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

25 112 90 110 20 S1.0 0.668 28.69 028.7

J - Analyte detected below quantitation limits

N - Analyte concentration was not sufficiently high to calculate RPDS - Spike Recovery outside accepted recovery limit

R - RPD outside accepted recovery limits

ND - Not Detected at the Reporting Limit

Prepared by Helena, MT Branch

Lab ID: H25050539-002AMSD Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 139 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: CCV Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 140 Continuing Calibration Verification StandarSampType:

Prep Method:Prep Info:

50 103 90 1101.0 051.7

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: H25050627-009BMS Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 152 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

25 110 90 1101.0 0.26927.9

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: H25050627-009BMSD Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 153 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

25 110 90 110 201.0 0.269 27.89 0.127.9

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: CCV Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 154 Continuing Calibration Verification StandarSampType:

Prep Method:Prep Info:

50 104 90 1101.0 051.8

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

J - Analyte detected below quantitation limits

N - Analyte concentration was not sufficiently high to calculate RPDS - Spike Recovery outside accepted recovery limit

R - RPD outside accepted recovery limits

ND - Not Detected at the Reporting Limit

Prepared by Helena, MT Branch

Lab ID: H25050627-010CMS Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 166 Sample Matrix SpikeSampType:

Prep Method:Prep Info:

25 106 90 1101.0 0.13626.6

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

Lab ID: H25050627-010CMSD Method: E300.0

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

IC METROHM_250529A: 167 Sample Matrix Spike DuplicateSampType:

Prep Method:Prep Info:

25 106 90 110 201.0 0.136 26.64 0.426.5

H25050627-001C, H25050627-002C, H25050627-003C, H25050627-004C, H25050627-005C, H25050627-006C, H25050627-007C, H25050627-008B, H25050627- 009B, H25050627-010C, H25050627-011C, H25050627-012C, H25050627-013C, H25050627-014C

J - Analyte detected below quantitation limits

N - Analyte concentration was not sufficiently high to calculate RPDS - Spike Recovery outside accepted recovery limit

R - RPD outside accepted recovery limits

ND - Not Detected at the Reporting Limit

BatchID: R205684 03-Jun-25Date:

Prepared by Helena, MT Branch

Lab ID: ICB Method: E353.2

Prep Date:

Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

RL

SEAL AA500_250530B: 12 Method BlankSampType:

Prep Method:Prep Info:

0.01ND

H25050627-001D, H25050627-002D, H25050627-003D, H25050627-004D, H25050627-005D, H25050627-006D, H25050627-007D, H25050627-008C, H25050627- 009C, H25050627-010D, H25050627-011D,…