Attachment_-_PT_Studies-PACE.pdf

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This document is a Water Supply Proficiency Testing Final Report issued by Phenova, a Certified Reference Materials company located in Golden, Colorado, for Environmental Science Corp. doing business as Pace Analytical National Center for Testing & Innovation in Mt. Juliet, Tennessee. The report covers a proficiency testing study (WS0721) conducted from July 12 to August 26, 2021, and is authorized to be distributed to multiple state regulatory agencies including Arizona, California, Colorado, Georgia, Iowa, Idaho, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Missouri, Mississippi, Montana, North Carolina, North Dakota, Nebraska, New Mexico, Nevada, Oklahoma, South Carolina, Tennessee, Utah, Vermont, Washington, and West Virginia, as well as the American Association for Laboratory Accreditation (A2LA).

The proficiency testing study evaluated the laboratory's performance across numerous water supply analysis categories, including trace metals, mercury, minerals, anions, cyanide, pH, residual chlorine, organic carbon, turbidity, volatile compounds, pesticides, and disinfection by-products. Of the 184 reported results, 173 (94.0%) were deemed acceptable, with the laboratory demonstrating consistent performance across various analytical methods and EPA-approved testing protocols. The study utilized multiple lot numbers for different analyte groups and employed various EPA and Standard Methods testing procedures, with results compared against established acceptance limits to ensure accurate and reliable water quality testing capabilities.

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6390 Joyce Drive

# 100

Golden, CO 80403

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

September 2, 2021

Mrs. Rebecca King Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation 12065 Lebanon Rd Mt. Juliet, TN 37122

USA

Dear Rebecca, Thank you for participating in the WS0721 Water Supply Proficiency Testing Study.

Enclosed is your final report, which has been carefully reviewed by the PT specialists at Phenova. This report presents some additional sections and features which will give you more information on the study data for the standards that were reported by your laboratory and more information regarding the overall performance of your laboratory in relation to other study participants.

The enclosed report is in two sections, the "Evaluation Report" and the "Statistical Report".

The "Evaluation Report" contains the evaluation of your reported data as well the reported method, analysis date and analyst. The "Evaluation Report" is an updated and enhanced version of the reports you previously received at the conclusion of our PT studies. The "Statistical Report" contains your passing percentage as well as statistics from the study for the analytes reported by your laboratory.

For any analyte falling outside the established acceptance limits, our PT management staff would like to assist you in determining the most appropriate course of corrective action for your facility. Please contact us at any time if we may be of service to you.

Thank you again for participating in the WS0721 Water Supply Proficiency Testing Study.

We appreciate working with you and look forward to our next study. If you have any questions, please call us at 866-942-2978.

Report Page - 1 of 27Report Issue Date - 9/2/2021

Golden, CO 80403

Report Definitions:

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

The Assigned Value is determined from the study mean, gravimetric and volumetric true concentration of an analyte to be analyzed, calculation and/or an appropriate reference value as stipulated in the

EPA National Standards for Water Proficiency Testing Studies Criteria

Document (current version), the National Environmental Laboratory

Accreditation Conference Institute (TNI) criteria (ref: TNI FOT tables, TNI PT Committee) and other documents distributed by accrediting agencies as applicable.

Assigned Value

Evaluation Limits Acceptance Limits are derived from fixed limits, coefficients, constants and calculations stipulated in the EPA National Standards for Water

Proficiency Testing Studies Criteria Documents (current version),the

National Environmental Laboratory Accreditation Conference Institute

(TNI) criteria (ref: TNI FOT tables, TNI PT Committee) and other documents distributed by accrediting agencies as applicable.

Evaluation

Acceptable The reported value falls within the Acceptance Limits.

No Evaluation

NR

The reported value is non-numeric and can not be evaluated.

As required by the TNI standards and requested by state authorities, any analyte purchased but not reported by your facility is listed as NR

(Not Reported).

Not Acceptable The reported value falls outside the Acceptance Limits.

Study Mean and

Standard Deviation

The mean and standard deviation are calculated from the study data using robust statistical calculations when possible. Other statistical calculations may be used if robust statistical calculations are not possible. The displayed values are independent of any statistical calculations required for the calculation of the analyte evaluation limits.

This report must not be reproduced except in full, without the written approval of Phenova.

Various aspects of Phenova’s proficiency testing schemes can from time to time be subcontracted. If subcontracting occurs, it is placed with a competent and qualified subcontractor and Phenova is responsible for all work performed.

This report must not be used to claim product certification, approval, or endorsement by the American Association for

Laboratory Accreditation (A2LA) or any agency of the federal government.

Report Page - 2 of 27Report Issue Date - 9/2/2021

State Regulatory Agency Request(s):

Other Regulatory Agency Request(s):

Phenova has been authorized to send a copy of your WS0721 final results to the following state agencies:

AZ, CAELAP, CO, GA, IA, ID, KY, LA, MA, MD, ME, MI, MO, MS, MT, NC, ND, NE, NM, NV, OK, SC, TN, UT, VT, WA and WV

Phenova has been authorized to send a copy of your WS0721 final results to the following agencies:

A2LA

Third Party Request(s):

Phenova has been requested to send a copy of your WS0721 final results to the following third parties:

American Association for Laboratory Accreditation

(A2LA)

5202 Presidents Court Suite 220 Frederick, MD 21703 Nick Slawson nslawson@a2la.org

North Carolina Department of Environmental Quality Laboratory Certification Branch 1623 Mail Service Center Raleigh, NC 27699-1623 Todd Crawford dwrCertPT@ncdenr.gov

6390 Joyce Drive # 100 Golden, CO 80403

Phone Fax www.phenova.com

303-940-0033 866-283-0269

Report Page - 3 of 27Report Issue Date - 9/2/2021

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-04Trace Metals 1 (PT-TM-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1000 EPA 200.7 Rev.4.4 1994 µg/L 866 854 737 - 996 Acceptable Aluminum 10013806388/ Jeremy

Gupton

8/5/2021

1000 EPA 200.8 Rev.4.4 1994 µg/L 866 837 737 - 996 Acceptable Aluminum 10014605638/Joseph

Duncan

7/28/2021

1005 EPA 200.7 Rev.4.4 1994 µg/L 28.4 26 19.9 - 37.0 Acceptable Antimony 10013806388/ Jeremy

Gupton

8/5/2021

1005 EPA 200.8 Rev.4.4 1994 µg/L 28.4 27.8 19.9 - 37.0 Acceptable Antimony 10014605638/Joseph

Duncan

7/28/2021

1010 EPA 200.7 Rev.4.4 1994 µg/L 40.6 39.8 28.4 - 52.8 Acceptable Arsenic 10013806572/Charles

Evans

8/4/2021

1010 EPA 200.8 Rev.4.4 1994 µg/L 40.6 39 28.4 - 52.8 Acceptable Arsenic 10014605638/Joseph

Duncan

7/28/2021

1015 EPA 200.7 Rev.4.4 1994 µg/L 986 979 838 - 1130 Acceptable Barium 10013806572/Charles

Evans

8/4/2021

1015 EPA 200.8 Rev.4.4 1994 µg/L 986 936 838 - 1130 Acceptable Barium 10014605638/Joseph

Duncan

7/28/2021

1020 EPA 200.7 Rev.4.4 1994 µg/L 9.02 9.09 7.67 - 10.4 Acceptable Beryllium 10013806388/ Jeremy

Gupton

8/5/2021

1020 EPA 200.8 Rev.4.4 1994 µg/L 9.02 8.94 7.67 - 10.4 Acceptable Beryllium 10014605388/ Jeremy

Gupton

8/13/2021

1025 EPA 200.7 Rev.4.4 1994 µg/L 1140 1140 968 - 1310 Acceptable Boron 10013806388/ Jeremy

Gupton

8/5/2021

1030 EPA 200.7 Rev.4.4 1994 µg/L 11.6 11.2 9.29 - 13.9 Acceptable Cadmium 10013806388/ Jeremy

Gupton

8/5/2021

1030 EPA 200.8 Rev.4.4 1994 µg/L 11.6 11.2 9.29 - 13.9 Acceptable Cadmium 10014605638/Joseph

Duncan

7/28/2021

1040 EPA 200.7 Rev.4.4 1994 µg/L 172 170 146 - 197 Acceptable Chromium 10013806572/Charles

Evans

8/4/2021

1040 EPA 200.8 Rev.4.4 1994 µg/L 172 170 146 - 197 Acceptable Chromium 10014605388/ Jeremy

Gupton

8/13/2021

1055 EPA 200.7 Rev.4.4 1994 µg/L 942 941 848 - 1040 Acceptable Copper 10013806572/Charles

Evans

8/4/2021

1055 EPA 200.8 Rev.4.4 1994 µg/L 942 932 848 - 1040 Acceptable Copper 10014605638/Joseph

Duncan

7/28/2021

Report Page - 4 of 27 Section - Evaluation

Report Issue Date - 9/2/2021

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-04Trace Metals 1 (PT-TM-WS) cont'd

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1070 EPA 200.7 Rev.4.4 1994 µg/L 893 862 759 - 1030 Acceptable Iron 10013806388/ Jeremy

Gupton

8/13/2021

1070 EPA 200.8 Rev.4.4 1994 µg/L 893 867 759 - 1030 Acceptable Iron 10014605638/Joseph

Duncan

7/28/2021

1075 EPA 200.7 Rev.4.4 1994 µg/L 69.5 69.6 48.7 - 90.4 Acceptable Lead 10013806572/Charles

Evans

8/4/2021

1075 EPA 200.8 Rev.4.4 1994 µg/L 69.5 66.1 48.7 - 90.4 Acceptable Lead 10014605388/ Jeremy

Gupton

8/13/2021

1090 EPA 200.7 Rev.4.4 1994 µg/L 814 791 692 - 936 Acceptable Manganese 10013806572/Charles

Evans

8/4/2021

1090 EPA 200.8 Rev.4.4 1994 µg/L 814 802 692 - 936 Acceptable Manganese 10014605388/ Jeremy

Gupton

8/13/2021

1100 EPA 200.7 Rev.4.4 1994 µg/L 27.0 27 22.9 - 31.0 Acceptable Molybdenum 10013806572/Charles

Evans

8/4/2021

1100 EPA 200.8 Rev.4.4 1994 µg/L 27.0 26.3 22.9 - 31.0 Acceptable Molybdenum 10014605638/Joseph

Duncan

7/28/2021

1105 EPA 200.7 Rev.4.4 1994 µg/L 257 261 219 - 296 Acceptable Nickel 10013806388/ Jeremy

Gupton

8/5/2021

1105 EPA 200.8 Rev.4.4 1994 µg/L 257 257 219 - 296 Acceptable Nickel 10014605638/Joseph

Duncan

7/28/2021

1140 EPA 200.7 Rev.4.4 1994 µg/L 18.9 18.3 15.2 - 22.7 Acceptable Selenium 10013806572/Charles

Evans

8/4/2021

1140 EPA 200.8 Rev.4.4 1994 µg/L 18.9 18.7 15.2 - 22.7 Acceptable Selenium 10014605638/Joseph

Duncan

7/28/2021

1150 EPA 200.7 Rev.4.4 1994 µg/L 161 161 113 - 209 Acceptable Silver 10013806388/ Jeremy

Gupton

8/5/2021

1150 EPA 200.8 Rev.4.4 1994 µg/L 161 161 113 - 209 Acceptable Silver 10014605388/ Jeremy

Gupton

8/13/2021

1165 EPA 200.8 Rev.4.4 1994 µg/L 5.44 5.08 3.81 - 7.08 Acceptable Thallium 10014605388/ Jeremy

Gupton

8/13/2021

1185 EPA 200.7 Rev.4.4 1994 µg/L 408 406 347 - 470 Acceptable Vanadium 10013806388/ Jeremy

Gupton

8/5/2021

1185 EPA 200.8 Rev.4.4 1994 µg/L 408 396 347 - 470 Acceptable Vanadium 10014605638/Joseph

Duncan

7/28/2021

Report Page - 5 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-04Trace Metals 1 (PT-TM-WS) cont'd

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1190 EPA 200.7 Rev.4.4 1994 µg/L 1450 1440 1230 - 1660 Acceptable Zinc 10013806388/ Jeremy

Gupton

8/13/2021

1190 EPA 200.8 Rev.4.4 1994 µg/L 1450 1440 1230 - 1660 Acceptable Zinc 10014605388/ Jeremy

Gupton

8/13/2021

Lot #: 9085-05Mercury (PT-HG-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1095 EPA 245.1 Rev.3 1994 µg/L 1.63 1.75 1.14 - 2.12 Acceptable Mercury 10036609802/Alexander

Blake Lansford

7/29/2021

Report Page - 6 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-51Minerals (PT-MIN-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1505 EPA 310.2 1974 mg/L 68.1 64.1 61.3 - 75.0 Acceptable Alkalinity as CaCO3 10055206512/Josh

Roberts

7/26/2021

1505 SM 2320 B-2011 2011 mg/L 68.1 73.7 61.3 - 75.0 Acceptable Alkalinity as CaCO3 20045618572/Charles

Evans

8/10/2021

1505 EPA 310.1 1978 mg/L 68.1 73 61.3 - 75.0 Acceptable Alkalinity as CaCO3 100548053623/ Ashley

Rose Duchac

8/1/2021

1505 SM 2320 B Rev. 22nd ED 2011 mg/L 68.1 73.7 61.3 - 75.0 Acceptable Alkalinity as CaCO3 20045414572/Charles

Evans

8/10/2021

1035 EPA 200.8 Rev.4.4 1994 mg/L 76.0 72.4 64.6 - 87.4 Acceptable Calcium 10014605388/Jeremy

Gupton

8/13/2021

1035 EPA 200.7 Rev.4.4 1994 mg/L 76.0 73.4 64.6 - 87.4 Acceptable Calcium 10013806572/Charles

Evans

8/4/2021

1550 EPA 200.8 Rev.4.4 1994 mg/L 190 183 161 - 218 Acceptable Calcium Hardness as CaCO3 10014605572/Charles

Evans

8/4/2021

1550 EPA 200.7 Rev.4.4 1994 mg/L 190 183 161 - 218 Acceptable Calcium Hardness as CaCO3 10013806572/Charles

Evans

8/4/2021

1550 SM 2340 B-2011 mg/L 190 183 161 - 218 Acceptable Calcium Hardness as CaCO3 20046611572/Charles

Evans

8/4/2021

1550 SM 2340 B Rev. 22nd ED 2011 mg/L 190 183 161 - 218 Acceptable Calcium Hardness as CaCO3 20046417572/Charles

Evans

8/4/2021

1755 EPA 130.1 1982 mg/L 255 252 217 - 293 Acceptable Total Hardness as CaCO3 10006801512/Josh

Roberts

8/9/2021

1755 EPA 200.7 Rev.4.4 1994 mg/L 255 243 217 - 293 Acceptable Total Hardness as CaCO3 10013806572/Charles

Evans

8/4/2021

1755 SM 2340 B-2011 mg/L 255 243 217 - 293 Acceptable Total Hardness as CaCO3 20046611572/Charles

Evans

8/4/2021

1755 EPA 200.8 Rev.4.4 1994 mg/L 255 243 217 - 293 Acceptable Total Hardness as CaCO3 10014605388/Jeremy

Gupton

8/13/2021

1755 SM 2340 B Rev. 22nd ED 2011 mg/L 255 243 217 - 293 Acceptable Total Hardness as CaCO3 20046417388/Jeremy

Gupton

8/13/2021

1085 EPA 200.8 Rev.4.4 1994 mg/L 15.5 15.1 13.2 - 17.8 Acceptable Magnesium 10014605388/Jeremy

Gupton

8/13/2021

1085 EPA 200.7 Rev.4.4 1994 mg/L 15.5 14.5 13.2 - 17.8 Acceptable Magnesium 10013806572/Charles

Evans

8/4/2021

Report Page - 7 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-51Minerals (PT-MIN-WS) cont'd

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1125 EPA 200.8 Rev.4.4 1994 mg/L 15.3 14.1 13.0 - 17.6 Acceptable Potassium 10014605388/Jeremy

Gupton

8/13/2021

1125 EPA 200.7 Rev.4.4 1994 mg/L 15.3 14 13.0 - 17.6 Acceptable Potassium 10013806572/Charles

Evans

8/4/2021

1155 EPA 200.8 Rev.4.4 1994 mg/L 31.2 29.3 26.5 - 35.8 Acceptable Sodium 10014605388/Jeremy

Gupton

8/13/2021

1155 EPA 200.7 Rev.4.4 1994 mg/L 31.2 29.4 26.5 - 35.8 Acceptable Sodium 10013806572/Charles

Evans

8/4/2021

1955 mg/L 484 387 - 581 NR Total Filterable Residue

Lot #: 9085-57Specific Conductance (PT-COND-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1610 EPA 120.1 1982 µmhos/cm 1060 1060 951 - 1160 Acceptable Specific Conductance 100064033503/Anna

Maria Hunter

8/11/2021

1610 SM 2510 B-2011 µmhos/cm 1060 1130 951 - 1160 Acceptable Specific Conductance 200486173503/Anna

Maria Hunter

8/4/2021

1610 SM 2510 B Rev.22nd Ed 2011 µmhos/cm 1060 1130 951 - 1160 Acceptable Specific Conductance 200484133503/Anna

Maria Hunter

8/4/2021

Lot #: 9085-67Corrosivity (Langelier Index) (PT-CORR-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1620 SM 2330 B Rev. 22nd ED 2010 SI units 0.671 0.675 0.271 - 1.07 Acceptable Corrosivity (Langelier Index) 200033653623/Ashley

Rose Duchac

8/10/2021

1620 Langelier calculation SI units 0.671 0.675 0.271 - 1.07 Acceptable Corrosivity (Langelier Index) 3623/Ashley

Rose Duchac

8/10/2021

Report Page - 8 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-08Anions 1 (PT-AN1-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1575 EPA 300.0 Rev.2.1 1993 mg/L 61.5 62.6 52.2 - 70.7 Acceptable Chloride 10053200920/Eva L

Burelos Nieto

8/10/2021

1575 SM 4110 B-2011 mg/L 61.5 61.3 52.2 - 70.7 Acceptable Chloride 20076919920/Eva L

Burelos Nieto

8/10/2021

1575 SM 4500-NO3 F-2011 mg/L 61.5 62.6 52.2 - 70.7 Acceptable Chloride 20117628920/Eva L

Burelos Nieto

8/11/2021

1730 EPA 300.0 Rev.2.1 1993 mg/L 3.81 3.96 3.43 - 4.19 Acceptable Fluoride 10053200920/Eva L

Burelos Nieto

8/10/2021

1730 SM 4110 B-2011 mg/L 3.81 3.7 3.43 - 4.19 Acceptable Fluoride 20076919920/Eva L

Burelos Nieto

8/10/2021

1730 SM 4500-NO3 F-2011 mg/L 3.81 4 3.43 - 4.19 Acceptable Fluoride 20117628920/Eva L

Burelos Nieto

8/11/2021

1810 SM 4110 B-2011 mg/L 8.65 8.52 7.79 - 9.52 Acceptable Nitrate as N 20076919920/Eva L

Burelos Nieto

8/10/2021

1810 SM 4110 B Rev.22nd ED 2011 mg/L 8.65 8.52 7.79 - 9.52 Acceptable Nitrate as N 20076828920/Eva L

Burelos Nieto

8/10/2021

1810 SM 4500-NO3 F-2011 mg/L 8.65 8.97 7.79 - 9.52 Acceptable Nitrate as N 20117628920/Eva L

Burelos Nieto

8/11/2021

1810 SM 4500-NO3 F Rev.21st ED mg/L 8.65 8.97 7.79 - 9.52 Acceptable Nitrate as N 20116409920/Eva L

Burelos Nieto

8/11/2021

1810 EPA 300.0 Rev.2.1 1993 mg/L 8.65 8.91 7.79 - 9.52 Acceptable Nitrate as N 10053200920/Eva L

Burelos Nieto

8/10/2021

1820 EPA 353.2 Rev.2 1993 mg/L 8.65 8.42 7.35 - 9.95 Acceptable Nitrate and Nitrite as N 100676041014/Marisa

Susan

Pasquerilla

8/11/2021

1870 SM 4500-P E Rev. 22nd ED mg/L 2.25 1.01 1.92 - 2.59 Not Acceptable Orthophosphate as P 201240103584/Sarah A

Chavez

8/10/2021

1870 SM 4500-P E-2011 mg/L 2.25 1.01 1.92 - 2.59 Not Acceptable Orthophosphate as P 201242253584/Sarah A

Chavez

8/10/2021

2000 EPA 300.0 Rev.2.1 1993 mg/L 159 163 135 - 183 Acceptable Sulfate 10053200920/Eva L

Burelos Nieto

8/10/2021

2000 SM 4110 B-2011 mg/L 159 159 135 - 183 Acceptable Sulfate 20076919920/Eva L

Burelos Nieto

8/11/2021

Report Page - 9 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-08Anions 1 (PT-AN1-WS) cont'd

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

2000 SM 4500-NO3 F-2011 mg/L 159 164 135 - 183 Acceptable Sulfate 20117628920/Eva L

Burelos Nieto

8/11/2021

Lot #: 9085-56Anions 2 - Nitrite as N (PT-AN2-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1840 EPA 353.2 Rev.2 1993 mg/L 0.970 0.949 0.825 - 1.12 Acceptable Nitrite as N 100676041014/Marisa

Susan

Pasquerilla

8/11/2021

1840 SM 4110 B-2011 mg/L 0.970 0.878 0.825 - 1.12 Acceptable Nitrite as N 20076919920/Eva L

Burelos Nieto

8/11/2021

1840 SM 4110 B Rev.22nd ED 2011 mg/L 0.970 0.878 0.825 - 1.12 Acceptable Nitrite as N 20076828920/Eva L

Burelos Nieto

8/11/2021

Lot #: 9085-09Cyanide (PT-CN-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1635 SM 4500-CN E-2011 2011 mg/L 0.113 0.0778 0.0850 - 0.142 Not Acceptable Cyanide (simple) 20096428958/Shannon D

Loggins

8/19/2021

1635 SM 4500-CN E Rev. 22nd ED mg/L 0.113 0.0778 0.0850 - 0.142 Not Acceptable Cyanide (simple) 20096213958/Shannon D

Loggins

8/19/2021

1635 EPA 335.4 Rev. 1 1993 mg/L 0.113 0.085 0.0850 - 0.142 Acceptable Cyanide (simple) 10061402958/Shannon D

Loggins

8/19/2021

Report Page - 10 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-11pH (PT-PH-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1900 SM 4500-H+B-2011 S.U. 9.23 9.25 9.03 - 9.43 Acceptable pH 201052203749/ Ceon

Coranek

Rayanne Brown

8/6/2021

1900 SM 4500-H+b Rev. 22nd Ed

S.U. 9.23 9.27 9.03 - 9.43 Acceptable pH 201050153577/Benjamin

J Dixon

8/11/2021

1900 EPA 150.1 1983 S.U. 9.23 9.27 9.03 - 9.43 Acceptable pH 100084093577/Benjamin

J Dixon

8/11/2021

Lot #: 9085-10Residual Chlorine (PT-CL-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1945 mg/L 2.32 1.91 - 2.73 NR Residual Free Chlorine

1940 SM 4500-Cl G Rev.22nd ED mg/L 2.32 2.24 1.97 - 2.67 Acceptable Total Residual Chlorine 200814183584/Sarah A

Chavez

8/11/2021

1940 SM 4500-Cl G-2011 mg/L 2.32 2.23 1.97 - 2.67 Acceptable Total Residual Chlorine 200816233584/Sarah A

Chavez

8/11/2021

Lot #: 9085-12Total and Dissolved Organic Carbon (PT-TOC-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

2040 SM 5310 C-2011 mg/L 5.48 5.91 4.38 - 6.57 Acceptable Total Organic Carbon 20138823803/ Michael

Abella

7/28/2021

2040 SM 5310 C Rev. 22nd ED 2011 mg/L 5.48 5.91 4.38 - 6.57 Acceptable Total Organic Carbon 20138618803/ Michael

Abella

7/28/2021

1710 SM 5310 C-2011 mg/L 5.48 3.82 4.85 - 6.02 Not Acceptable Dissolved Organic Carbon (DOC) 20138823803/ Michael

Abella

7/30/2021

1710 SM 5310 C Rev. 22nd ED 2011 mg/L 5.48 3.82 4.85 - 6.02 Not Acceptable Dissolved Organic Carbon (DOC) 20138618803/ Michael

Abella

7/30/2021

Report Page - 11 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-13Turbidity (PT-TURB-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

2055 EPA 180.1 Rev.2 1993 NTU 1.18 1.24 0.945 - 1.48 Acceptable Turbidity 100118003584/Sarah A

Chavez

8/10/2021

2055 SM 2130 B-2011 NTU 1.18 1.24 0.945 - 1.48 Acceptable Turbidity 200482203584/Sarah A

Chavez

8/10/2021

2055 SM 2130 B Rev.22nd Ed 2011 NTU 1.18 1.24 0.945 - 1.48 Acceptable Turbidity 200426193584/Sarah A

Chavez

8/10/2021

Lot #: 9085-14BIDB 1 - Bromide and Bromate (PT-IDB1-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1535 µg/L 23.8 16.6 - 30.9 NR Bromate

1540 EPA 300.0 Rev.2.1 1993 µg/L 175 168.7 149 - 201 Acceptable Bromide 10053200920/Eva L

Burelos Nieto

8/11/2021

Lot #: 9085-16Surfactants (MBAS) (PT-MBAS-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

2025 SM 5540 C-2011 mg/L 0.456 0.397 0.321 - 0.583 Acceptable Surfactants - MBAS 201450663714/ Alexis

Rose Milam

8/5/2021

2025 SM 5540 C Rev. 22nd ED 2011 mg/L 0.456 0.397 0.321 - 0.583 Acceptable Surfactants - MBAS 201448143714/ Alexis

Rose Milam

8/5/2021

Lot #: 9085-17Silica (PT-SIO2-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1990 EPA 200.7 Rev.4.4 1994 mg/L 49.3 47 41.9 - 56.7 Acceptable Silica as SiO2 10013806572/Charles

Evens

8/4/2021

Report Page - 12 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-18Perchlorate (PT-PERC-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1895 EPA 314 Rev.1 1999 µg/L 8.82 8.42 7.06 - 10.6 Acceptable Perchlorate 10055604183/Mary

Garrett

8/12/2021

Lot #: 9085-19UV254 (PT-UV-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

2060 SM 5910 B-2011 cm-1 0.242 0.251 0.195 - 0.293 Acceptable UV 254 Absorbance 201464123584/Sarah A

Chavez

8/11/2021

2060 SM 5910 B Rev.22nd ED 2011 cm-1 0.242 0.251 0.195 - 0.293 Acceptable UV 254 Absorbance 201462183584/Sarah A

Chavez

8/11/2021

Lot #: 9085-20Hexavalent Chromium (PT-CR6-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1045 SM 3500-Cr B-2011 µg/L 31.9 30 25.5 - 38.3 Acceptable Chromium VI 200662663584/ Sarah A

Chavez

8/5/2021

1045 SM 3500-Cr C-2011 µg/L 31.9 31 25.5 - 38.3 Acceptable Chromium VI 20068364818/ Garrett

Bryant

8/4/2021

1045 EPA 218.6 Rev. 3.3 1994 µg/L 31.9 32.4 25.5 - 38.3 Acceptable Chromium VI 10028009818/ Garrett

Bryant

8/5/2021

Lot #: 9085-54Uranium (PT-U-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

3055 EPA 200.8 Rev.4.4 1994 µg/L 44.0 38.6 35.6 - 48.9 Acceptable Uranium 10014605638/Joseph

Duncan

7/28/2021

Report Page - 13 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-62Solids (PT-SOL-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

1955 SM 2540 C-2011 mg/L 685 693 548 - 823 Acceptable Total Filterable Residue 200504131000/ Keith A

Blanchard

7/28/2021

1955 SM 2540 C Rev. 22nd ED 2011 mg/L 685 693 548 - 823 Acceptable Total Filterable Residue 200504241000/ Keith A

Blanchard

7/28/2021

Additional State Specific Analytes 1960 SM 2540 C-2011 mg/L 50.9 50.5 40.8 - 61.1 Acceptable Non-Filterable Residue (TSS) 2005041336/ Margaret

Frye

8/2/2021

1960 SM 2540 C Rev. 22nd ED 2011 mg/L 50.9 50.5 40.8 - 61.1 Acceptable Non-Filterable Residue (TSS) 2005042436/ Margaret

Frye

8/2/2021

1950 mg/L 736 589 - 884 NR Total Solids

Report Page - 14 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-21Regulated Volatiles (PT-RVOA-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

4375 EPA 524.2 Rev.4.1 1995 µg/L 6.49 6.63 3.90 - 9.09 Acceptable Benzene 1008880974/ John Heath7/28/2021

4455 EPA 524.2 Rev.4.1 1995 µg/L 4.70 4.96 2.82 - 6.57 Acceptable Carbon Tetrachloride 1008880974/ John Heath7/28/2021

4475 EPA 524.2 Rev.4.1 1995 µg/L 17.4 17.8 13.9 - 20.9 Acceptable Chlorobenzene 1008880974/ John Heath7/28/2021

4610 EPA 524.2 Rev.4.1 1995 µg/L 6.30 5.57 3.78 - 8.82 Acceptable 1,2-Dichlorobenzene 1008880974/ John Heath7/28/2021

4620 EPA 524.2 Rev.4.1 1995 µg/L 3.74 3.2 2.24 - 5.23 Acceptable 1,4-Dichlorobenzene 1008880974/ John Heath7/28/2021

4635 EPA 524.2 Rev.4.1 1995 µg/L 4.47 4.4 2.68 - 6.25 Acceptable 1,2-Dichloroethane 1008880974/ John Heath7/28/2021

4640 EPA 524.2 Rev.4.1 1995 µg/L 4.96 6.03 2.97 - 6.94 Acceptable 1,1-Dichloroethylene 1008880974/ John Heath7/28/2021

4645 EPA 524.2 Rev.4.1 1995 µg/L 10.6 10.4 8.52 - 12.8 Acceptable cis-1,2-Dichloroethylene 1008880974/ John Heath7/28/2021

4700 EPA 524.2 Rev.4.1 1995 µg/L 7.67 7.53 4.60 - 10.7 Acceptable trans-1,2-Dichloroethylene 1008880974/ John Heath7/28/2021

4975 EPA 524.2 Rev.4.1 1995 µg/L 15.2 15.8 12.1 - 18.2 Acceptable Dichloromethane (Methylene Chloride) 1008880974/ John Heath7/28/2021

4655 EPA 524.2 Rev.4.1 1995 µg/L 7.47 7.41 4.48 - 10.5 Acceptable 1,2-Dichloropropane 1008880974/ John Heath7/28/2021

4765 EPA 524.2 Rev.4.1 1995 µg/L 7.44 7.83 4.46 - 10.4 Acceptable Ethylbenzene 1008880974/ John Heath7/28/2021

5100 EPA 524.2 Rev.4.1 1995 µg/L 4.42 4.79 2.65 - 6.18 Acceptable Styrene 1008880974/ John Heath7/28/2021

5115 EPA 524.2 Rev.4.1 1995 µg/L 15.0 15.5 12.0 - 18.0 Acceptable Tetrachloroethylene 1008880974/ John Heath8/2/2021

5140 EPA 524.2 Rev.4.1 1995 µg/L 8.74 9.01 5.25 - 12.2 Acceptable Toluene 1008880974/ John Heath7/28/2021

5155 EPA 524.2 Rev.4.1 1995 µg/L 17.4 12.6 13.9 - 20.9 Not Acceptable 1,2,4-Trichlorobenzene 1008880974/ John Heath7/28/2021

5160 EPA 524.2 Rev.4.1 1995 µg/L 8.68 8.84 5.21 - 12.1 Acceptable 1,1,1-Trichloroethane 1008880974/ John Heath7/28/2021

5165 EPA 524.2 Rev.4.1 1995 µg/L 6.42 5.68 3.85 - 8.99 Acceptable 1,1,2-Trichloroethane 1008880974/ John Heath7/28/2021

5170 EPA 524.2 Rev.4.1 1995 µg/L 14.9 15.3 11.9 - 17.9 Acceptable Trichloroethylene 1008880974/ John Heath7/28/2021

5235 EPA 524.2 Rev.4.1 1995 µg/L 9.92 9.53 5.95 - 13.9 Acceptable Vinyl Chloride 1008880974/ John Heath7/28/2021

5260 EPA 524.2 Rev.4.1 1995 µg/L 15.0 15.9 12.0 - 17.9 Acceptable Total Xylenes 1008880974/ John Heath7/28/2021

Report Page - 15 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-22Unregulated Volatiles (PT-UNRVOA-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

4385 EPA 524.2 Rev.4.1 1995 µg/L 15.2 14.7 12.1 - 18.2 Acceptable Bromobenzene 1008880974/ John Heath7/28/2021

4390 EPA 524.2 Rev.4.1 1995 µg/L 7.92 8.24 4.75 - 11.1 Acceptable Bromochloromethane 1008880974/ John Heath8/2/2021

4950 EPA 524.2 Rev.4.1 1995 µg/L <3 1.41 Acceptable Bromomethane 1008880974/ John Heath7/28/2021

4435 EPA 524.2 Rev.4.1 1995 µg/L 9.59 9.62 5.76 - 13.4 Acceptable n-Butylbenzene 1008880974/ John Heath7/28/2021

4440 EPA 524.2 Rev.4.1 1995 µg/L 6.36 6.49 3.82 - 8.91 Acceptable sec-Butylbenzene 1008880974/ John Heath8/2/2021

4445 EPA 524.2 Rev.4.1 1995 µg/L 12.7 12.9 10.2 - 15.3 Acceptable tert-Butylbenzene 1008880974/ John Heath7/28/2021

4485 EPA 524.2 Rev.4.1 1995 µg/L 19.4 21.1 11.6 - 27.1 Acceptable Chloroethane 1008880974/ John Heath7/28/2021

4960 EPA 524.2 Rev.4.1 1995 µg/L 26.2 18.9 15.7 - 36.7 Acceptable Chloromethane 1008880974/ John Heath8/2/2021

4535 EPA 524.2 Rev.4.1 1995 µg/L 12.7 13.2 10.2 - 15.2 Acceptable 2-Chlorotoluene 1008880974/ John Heath7/28/2021

4540 EPA 524.2 Rev.4.1 1995 µg/L 11.4 12.3 9.15 - 13.7 Acceptable 4-Chlorotoluene 1008880974/ John Heath7/28/2021

4595 EPA 524.2 Rev.4.1 1995 µg/L 4.75 4.84 2.85 - 6.65 Acceptable Dibromomethane 1008880974/ John Heath7/28/2021

4615 EPA 524.2 Rev.4.1 1995 µg/L 7.16 7.88 4.29 - 10.0 Acceptable 1,3-Dichlorobenzene 1008880974/ John Heath7/28/2021

4625 EPA 524.2 Rev.4.1 1995 µg/L <3 <0.5 Acceptable Dichlorodifluoromethane 1008880974/ John Heath7/28/2021

4630 EPA 524.2 Rev.4.1 1995 µg/L 12.8 13.4 10.2 - 15.3 Acceptable 1,1-Dichloroethane 1008880974/ John Heath7/28/2021

4660 EPA 524.2 Rev.4.1 1995 µg/L 15.3 14.5 12.2 - 18.3 Acceptable 1,3-Dichloropropane 1008880974/ John Heath7/28/2021

4665 EPA 524.2 Rev.4.1 1995 µg/L 9.74 9.67 5.84 - 13.6 Acceptable 2,2-Dichloropropane 1008880974/ John Heath7/28/2021

4670 EPA 524.2 Rev.4.1 1995 µg/L 4.86 5.26 2.92 - 6.81 Acceptable 1,1-Dichloropropene 1008880974/ John Heath7/28/2021

4680 EPA 524.2 Rev.4.1 1995 µg/L 7.26 6.98 4.35 - 10.2 Acceptable cis-1,3-Dichloropropene 1008880974/ John Heath8/2/2021

4685 EPA 524.2 Rev.4.1 1995 µg/L 14.3 13.4 11.4 - 17.2 Acceptable trans-1,3-Dichloropropene 1008880974/ John Heath7/28/2021

5175 EPA 524.2 Rev.4.1 1995 µg/L <3 <0.5 Acceptable Fluorotrichloromethane 1008880974/ John Heath7/28/2021

4835 EPA 524.2 Rev.4.1 1995 µg/L 15.6 13.1 12.4 - 18.7 Acceptable Hexachlorobutadiene 1008880974/ John Heath7/28/2021

4900 EPA 524.2 Rev.4.1 1995 µg/L 3.56 3.83 2.14 - 4.99 Acceptable Isopropylbenzene 1008880974/ John Heath7/28/2021

4910 EPA 524.2 Rev.4.1 1995 µg/L 4.02 4.02 2.41 - 5.62 Acceptable 4-Isopropyltoluene 1008880974/ John Heath7/28/2021

5000 EPA 524.2 Rev.4.1 1995 µg/L 39.6 37.8 31.7 - 47.5 Acceptable MTBE 1008880974/ John Heath7/28/2021

5005 EPA 524.2 Rev.4.1 1995 µg/L 23.8 20.7 16.7 - 31.0 Acceptable Naphthalene 1008880974/ John Heath7/28/2021

5090 EPA 524.2 Rev.4.1 1995 µg/L 9.55 11.3 5.73 - 13.4 Acceptable n-Propylbenzene 1008880974/ John Heath7/28/2021

5105 EPA 524.2 Rev.4.1 1995 µg/L 15.9 15.5 12.7 - 19.0 Acceptable 1,1,1,2-Tetrachloroethane 1008880974/ John Heath7/28/2021

5110 EPA 524.2 Rev.4.1 1995 µg/L 4.76 4.35 2.85 - 6.66 Acceptable 1,1,2,2-Tetrachloroethane 1008880974/ John Heath7/28/2021

Report Page - 16 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-22Unregulated Volatiles (PT-UNRVOA-WS) cont'd

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

5150 EPA 524.2 Rev.4.1 1995 µg/L 19.0 16.4 15.2 - 22.8 Acceptable 1,2,3-Trichlorobenzene 1008880974/ John Heath7/28/2021

5180 EPA 524.2 Rev.4.1 1995 µg/L 14.4 14.4 11.5 - 17.3 Acceptable 1,2,3-Trichloropropane 1008880974/ John Heath7/28/2021

5210 EPA 524.2 Rev.4.1 1995 µg/L 6.30 7.15 3.78 - 8.82 Acceptable 1,2,4-Trimethylbenzene 1008880974/ John Heath7/28/2021

5215 EPA 524.2 Rev.4.1 1995 µg/L 7.12 8.04 4.27 - 9.97 Acceptable 1,3,5-Trimethylbenzene 1008880974/ John Heath7/28/2021

Lot #: 9085-23Trihalomethanes (PT-THM-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

4395 EPA 524.2 Rev.4.1 1995 µg/L 31.1 43.9 24.9 - 37.4 Not Acceptable Bromodichloromethane 1008880974/ John Heath7/26/2021

4400 EPA 524.2 Rev.4.1 1995 µg/L 17.5 20.8 14.0 - 21.0 Acceptable Bromoform 1008880974/ John Heath7/26/2021

4575 EPA 524.2 Rev.4.1 1995 µg/L 30.7 40.4 24.6 - 36.9 Not Acceptable Chlorodibromomethane 1008880974/ John Heath7/26/2021

4505 EPA 524.2 Rev.4.1 1995 µg/L 37.4 53.8 30.0 - 44.9 Not Acceptable Chloroform 1008880974/ John Heath7/26/2021

Additional State Specific Analytes 5205 EPA 524.2 Rev.4.1 1995 µg/L 117 159 93.5 - 140 Not Acceptable Total Trihalomethanes 1008880974/ John Heath7/26/2021

Report Page - 17 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-24Pesticides (PT-PEST-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

7005 EPA 507 Rev.2.1 1995 µg/L 16.2 14.4 8.90 - 23.5 Acceptable Alachlor 10084603647/Matt Jones7/27/2021

7025 µg/L 1.00 0.446 - 1.28 NR Aldrin

7065 EPA 507 Rev.2.1 1995 µg/L 6.19 5.74 3.40 - 8.97 Acceptable Atrazine 10084603647/Matt Jones7/27/2021

7160 EPA 507 Rev.2.1 1995 µg/L 4.98 3.97 2.74 - 7.22 Acceptable Butachlor 10084603647/Matt Jones7/27/2021

7470 µg/L 2.00 1.10 - 2.90 NR Dieldrin

7540 µg/L 0.626 0.438 - 0.814 NR Endrin

7685 µg/L 2.00 1.10 - 2.90 NR Heptachlor

7690 µg/L 2.06 1.13 - 2.99 NR Heptachlor Epoxide (beta)

6275 µg/L 1.32 0.646 - 1.67 NR Hexachlorobenzene

6285 µg/L 8.13 2.37 - 11.6 NR Hexachlorocyclopentadiene

7120 µg/L 1.40 0.768 - 2.03 NR Lindane

7810 µg/L 4.96 2.73 - 7.18 NR Methoxychlor

7835 EPA 507 Rev.2.1 1995 µg/L 5.62 4.84 3.09 - 8.15 Acceptable Metolachlor 10084603647/Matt Jones7/27/2021

7845 EPA 507 Rev.2.1 1995 µg/L 9.17 7.95 4.58 - 13.8 Acceptable Metribuzin 10084603647/Matt Jones7/27/2021

8045 µg/L 5.49 3.02 - 7.97 NR Propachlor

8125 EPA 507 Rev.2.1 1995 µg/L 4.11 4.99 2.26 - 5.96 Acceptable Simazine 10084603647/Matt Jones7/27/2021

8295 µg/L 8.00 4.40 - 11.6 NR Trifluralin

Additional State Specific Analytes 7130 µg/L 7.89 4.34 - 11.4 NR Bromacil

7310 µg/L <0.5 NR Chlorothalonil

7410 µg/L 3.86 1.70 - 5.60 NR Diazinon

7475 µg/L <0.5 NR Dimethoate

7875 µg/L 32.5 17.9 - 47.2 NR Molinate

8035 µg/L <0.5 NR Prometon

8040 µg/L <0.5 NR Prometryn

8220 µg/L <0.5 NR Thiobencarb

Report Page - 18 of 27

Golden, CO 80403

Final Report - Water Supply Proficiency Testing

Study: WS0721

Laboratory: Contact:

EPA Lab ID: TN00003

Mrs. Rebecca King

615-773-9657

Opening Date: July 12, 2021 - Closing Date: August 26, 2021 Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

Lot #: 9085-27EDB/DBCP/TCP (PT-EDBCP-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

4570 EPA 504.1 Rev.1.1 1995 µg/L 1.53 1.62 0.915 - 2.14 Acceptable 1,2-Dibromo-3-chloropropane (DBCP) 10082801647/Matt Jones8/2/2021

4585 EPA 504.1 Rev.1.1 1995 µg/L 0.778 0.717 0.467 - 1.09 Acceptable Ethylene Dibromide (EDB) 10082801647/Matt Jones8/2/2021

5180 µg/L 1.14 0.684 - 1.60 NR 1,2,3-Trichloropropane

Lot #: 9085-34Organic Disinfection By Product (PT-ODB-WS)

NELAC

Code

Analyte Method Description Units Assigned

Value

Result Acceptance

Limits

EvaluationMethod

Code

Analysis Date Analyst

9315 µg/L 9.38 5.63 - 13.1 NR Bromochloroacetic Acid

9357 EPA 552.2 Rev.1 1997 µg/L 43.2 47.7 25.9 - 60.5 Acceptable Dibromoacetic Acid 10095804377/Allen Fuller8/5/2021

9360 EPA 552.2 Rev.1 1998 µg/L 37.7 35.7 22.6 - 52.8 Acceptable Dichloroacetic Acid 10095804377/Allen Fuller8/5/2021

9312 EPA 552.2 Rev.1 1995 µg/L 28.3 28.4 17.0 - 39.6 Acceptable Monobromoacetic Acid 10095804377/Allen Fuller8/5/2021

9336 EPA 552.2 Rev.1 1996 µg/L 40.4 38.9 24.3 - 56.6 Acceptable Monochloroacetic Acid 10095804377/Allen Fuller8/5/2021

9642 EPA 552.2 Rev.1 2000 µg/L 30.1 28.8 18.0 - 42.1 Acceptable Trichloroacetic Acid 10095804377/Allen Fuller8/5/2021

Report Page - 19 of 27

PT Study Score Report

Laboratory:

EPA ID: TN00003

Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

6390 Joyce Drive

# 100

Golden, CO 80403

Study Number

Number of

Reported Results

Number of

Passing Results Percent Passing

ResultsWS0721 184 173 94.0%

Report Definitions:

Number of Reported Results The number of results reported which could be evaluated. Results receiving an evaluation of "NR" or "No Evaluation" are not included.

Number of Passing Results The number of results reported receiving an evaluation of "Acceptable" or

"Check for Error".

Percent Passing The percentage of results reported receiving an evaluation of "Acceptable" or

"Check for Error".

Report Page - 20 of 27 Section - Statistical

Statistical Summary Report - Water Supply Proficiency Testing

Opening Date: July 12, 2021 - Closing Date: August 26, 2021

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

6390 Joyce Drive

# 100

Golden, CO 80403

Laboratory:

EPA Lab ID: TN00003

Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Contact: Mrs. Rebecca King

615-773-9657

Lot #: 9085-04Trace Metals 1 (PT-TM-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1000 µg/L Aluminum 863 44.5 85.1 115

1005 µg/L Antimony 27.2 2.34 70.1 130

1010 µg/L Arsenic 40.5 3.18 70.0 130

1015 µg/L Barium 987 52.3 85.0 115

1020 µg/L Beryllium 8.96 0.557 85.0 115

1025 µg/L Boron 1160 60.3 84.9 115

1030 µg/L Cadmium 11.6 0.698 80.1 120

1040 µg/L Chromium 173 7.38 84.9 115

1055 µg/L Copper 948 41.8 90.0 110

1070 µg/L Iron 909 40.8 85.0 115

1075 µg/L Lead 70.3 4.01 70.1 130

1090 µg/L Manganese 820 40.4 85.0 115

1100 µg/L Molybdenum 26.9 1.55 84.8 115

1105 µg/L Nickel 259 10.6 85.2 115

1140 µg/L Selenium 18.7 1.54 80.4 120

1150 µg/L Silver 163 8.04 70.2 130

1165 µg/L Thallium 5.36 0.402 70.0 130

1185 µg/L Vanadium 407 13.9 85.0 115

1190 µg/L Zinc 1450 78.5 84.8 114

Lot #: 9085-05Mercury (PT-HG-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1095 µg/L Mercury 1.60 0.134 69.9 130

Lot #: 9085-51Minerals (PT-MIN-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1505 mg/L Alkalinity as CaCO3 68.2 3.02 90.0 110

1035 mg/L Calcium 74.7 3.63 85.0 115

1550 mg/L Calcium Hardness as CaCO3 186 6.44 84.7 115

1755 mg/L Total Hardness as CaCO3 247 8.38 85.1 115

1085 mg/L Magnesium 15.3 0.819 85.2 115

1125 mg/L Potassium 15.4 0.796 85.0 115

1155 mg/L Sodium 31.2 1.64 84.9 115

1955 mg/L Total Filterable Residue 555 96.2 80.0 120

Lot #: 9085-57Specific Conductance (PT-COND-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1610 µmhos/cm Specific Conductance 1060 28.1 89.7 109

Report Page - 21 of 27

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

6390 Joyce Drive

# 100

Golden, CO 80403

Laboratory:

EPA Lab ID: TN00003

Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Contact: Mrs. Rebecca King

615-773-9657

Lot #: 9085-67Corrosivity (Langelier Index)

(PT-CORR-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1620 SI units Corrosivity (Langelier Index) 0.703 0.0778 40.4 159

Lot #: 9085-08Anions 1 (PT-AN1-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1575 mg/L Chloride 62.0 2.46 84.9 115

1730 mg/L Fluoride 3.76 0.220 90.0 110

1810 mg/L Nitrate as N 8.56 0.487 90.1 110

1820 mg/L Nitrate and Nitrite as N 8.51 0.554 85.0 115

1870 mg/L Orthophosphate as P 2.21 0.133 85.3 115

2000 mg/L Sulfate 158 7.88 84.9 115

Lot #: 9085-56Anions 2 - Nitrite as N (PT-AN2-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1840 mg/L Nitrite as N 0.972 0.0382 85.1 115

Lot #: 9085-09Cyanide (PT-CN-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1635 mg/L Cyanide (simple) 0.111 0.0116 75.2 126

Lot #: 9085-11pH (PT-PH-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1900 S.U. pH 9.19 0.100 97.8 102

Lot #: 9085-10Residual Chlorine (PT-CL-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1945 mg/L Residual Free Chlorine 2.06 0.185 82.3 118

1940 mg/L Total Residual Chlorine 2.13 0.175 84.9 115

Lot #: 9085-12Total and Dissolved Organic Carbon

(PT-TOC-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

2040 mg/L Total Organic Carbon 5.52 0.397 79.9 120

1710 mg/L Dissolved Organic Carbon (DOC) 5.48 0.440 88.5 110

Report Page - 22 of 27

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

6390 Joyce Drive

# 100

Golden, CO 80403

Laboratory:

EPA Lab ID: TN00003

Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Contact: Mrs. Rebecca King

615-773-9657

Lot #: 9085-13Turbidity (PT-TURB-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

2055 NTU Turbidity 1.23 0.141 80.1 125

Lot #: 9085-14BIDB 1 - Bromide and Bromate

(PT-IDB1-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1535 µg/L Bromate 23.9 3.78 69.7 130

1540 µg/L Bromide 174 12.2 85.1 115

Lot #: 9085-16Surfactants (MBAS) (PT-MBAS-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

2025 mg/L Surfactants - MBAS 0.504 0.0980 70.4 128

Lot #: 9085-17Silica (PT-SIO2-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1990 mg/L Silica as SiO2 47.8 2.70 85.0 115

Lot #: 9085-18Perchlorate (PT-PERC-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1895 µg/L Perchlorate 8.59 0.631 80.0 120

Lot #: 9085-19UV254 (PT-UV-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

2060 cm-1 UV 254 Absorbance 0.243 0.0233 80.6 121

Lot #: 9085-20Hexavalent Chromium (PT-CR6-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1045 µg/L Chromium VI 31.2 0.841 79.9 120

Lot #: 9085-54Uranium (PT-U-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

3055 µg/L Uranium 43.6 2.82 80.9 111

Report Page - 23 of 27

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

6390 Joyce Drive

# 100

Golden, CO 80403

Laboratory:

EPA Lab ID: TN00003

Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Contact: Mrs. Rebecca King

615-773-9657

Lot #: 9085-62Solids (PT-SOL-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

1955 mg/L Total Filterable Residue 693 28.4 80.0 120

Additional State Specific Analytes 1960 mg/L Non-Filterable Residue (TSS) 48.1 2.14 80.2 120

1950 mg/L Total Solids 722 29.2 80.0 120

Lot #: 9085-21Regulated Volatiles (PT-RVOA-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

4375 µg/L Benzene 6.59 0.490 60.1 140

4455 µg/L Carbon Tetrachloride 4.70 0.557 60.0 140

4475 µg/L Chlorobenzene 17.6 1.28 79.9 120

4610 µg/L 1,2-Dichlorobenzene 6.37 0.691 60.0 140

4620 µg/L 1,4-Dichlorobenzene 3.68 0.410 59.9 140

4635 µg/L 1,2-Dichloroethane 4.45 0.402 60.0 140

4640 µg/L 1,1-Dichloroethylene 5.54 0.463 59.9 140

4645 µg/L cis-1,2-Dichloroethylene 10.2 1.24 80.4 121

4700 µg/L trans-1,2-Dichloroethylene 7.36 0.712 60.0 140

4975 µg/L Dichloromethane (Methylene Chloride) 15.8 1.37 79.6 120

4655 µg/L 1,2-Dichloropropane 7.21 0.711 60.0 141

4765 µg/L Ethylbenzene 7.68 0.551 59.9 140

5100 µg/L Styrene 4.61 0.500 60.0 140

5115 µg/L Tetrachloroethylene 14.7 1.85 80.0 120

5140 µg/L Toluene 8.86 0.788 60.1 140

5155 µg/L 1,2,4-Trichlorobenzene 17.1 2.87 79.9 120

5160 µg/L 1,1,1-Trichloroethane 8.38 0.867 60.0 139

5165 µg/L 1,1,2-Trichloroethane 5.75 0.652 60.0 140

5170 µg/L Trichloroethylene 14.7 1.37 79.9 120

5235 µg/L Vinyl Chloride 10.2 1.72 60.0 140

5260 µg/L Total Xylenes 15.4 1.27 80.0 119

Report Page - 24 of 27

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

6390 Joyce Drive

# 100

Golden, CO 80403

Laboratory:

EPA Lab ID: TN00003

Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Contact: Mrs. Rebecca King

615-773-9657

Lot #: 9085-22Unregulated Volatiles (PT-UNRVOA-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

4385 µg/L Bromobenzene 15.3 1.39 79.6 120

4390 µg/L Bromochloromethane 7.91 0.759 60.0 140

4950 µg/L Bromomethane N/A N/A N/A N/A

4435 µg/L n-Butylbenzene 9.80 0.989 60.1 140

4440 µg/L sec-Butylbenzene 6.60 0.559 60.1 140

4445 µg/L tert-Butylbenzene 12.9 1.26 80.3 120

4485 µg/L Chloroethane 20.8 2.79 59.8 140

4960 µg/L Chloromethane 25.2 6.68 59.9 140

4535 µg/L 2-Chlorotoluene 12.8 0.877 80.3 120

4540 µg/L 4-Chlorotoluene 11.7 0.814 80.3 120

4595 µg/L Dibromomethane 4.79 0.445 60.0 140

4615 µg/L 1,3-Dichlorobenzene 7.40 0.521 59.9 140

4625 µg/L Dichlorodifluoromethane N/A N/A N/A N/A

4630 µg/L 1,1-Dichloroethane 12.8 0.845 79.7 120

4660 µg/L 1,3-Dichloropropane 15.1 1.24 79.7 120

4665 µg/L 2,2-Dichloropropane 9.75 1.18 60.0 140

4670 µg/L 1,1-Dichloropropene 4.86 0.485 60.1 140

4680 µg/L cis-1,3-Dichloropropene 6.92 0.713 59.9 140

4685 µg/L trans-1,3-Dichloropropene 14.1 1.02 79.7 120

5175 µg/L Fluorotrichloromethane N/A N/A N/A N/A

4835 µg/L Hexachlorobutadiene 15.4 1.77 79.5 120

4900 µg/L Isopropylbenzene 3.42 0.457 60.1 140

4910 µg/L 4-Isopropyltoluene 4.08 0.388 60.0 140

5000 µg/L MTBE 39.5 4.14 80.1 120

5005 µg/L Naphthalene 24.0 2.79 70.2 130

5090 µg/L n-Propylbenzene 9.88 0.765 60.0 140

5105 µg/L 1,1,1,2-Tetrachloroethane 15.7 1.36 79.9 119

5110 µg/L 1,1,2,2-Tetrachloroethane 4.67 0.644 59.9 140

5150 µg/L 1,2,3-Trichlorobenzene 19.4 2.56 80.0 120

5180 µg/L 1,2,3-Trichloropropane 14.4 2.09 79.9 120

5210 µg/L 1,2,4-Trimethylbenzene 6.55 0.617 60.0 140

5215 µg/L 1,3,5-Trimethylbenzene 7.53 0.640 60.0 140

Lot #: 9085-23Trihalomethanes (PT-THM-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

4395 µg/L Bromodichloromethane 31.4 2.92 80.1 120

4400 µg/L Bromoform 17.7 2.50 80.0 120

4575 µg/L Chlorodibromomethane 31.7 3.35 80.1 120

4505 µg/L Chloroform 38.2 2.77 80.2 120

Additional State Specific Analytes 5205 µg/L Total Trihalomethanes 119 10.2 79.9 120

Report Page - 25 of 27

Phone 303-940-0033

Fax 866-283-0269 www.phenova.com

6390 Joyce Drive

# 100

Golden, CO 80403

Laboratory:

EPA Lab ID: TN00003

Environmental Science Corp. dba: Pace Analytical National Center for Testing & Innovation

12065 Lebanon Rd

Mt. Juliet, TN 37122

USA

Contact: Mrs. Rebecca King

615-773-9657

Lot #: 9085-24Pesticides (PT-PEST-WS)

NELAC

Code

Analyte Units Study Mean Study

Standard

Deviation

Low Acceptance

Limit %

High Acceptance

Limit %

7005 µg/L Alachlor 15.6 2.48 54.9 145

7025 µg/L Aldrin 0.885 0.109 44.6 128

7065 µg/L Atrazine 5.74 1.06 54.9 145

7160 µg/L Butachlor 4.82 0.783 55.0 145

7470 µg/L Dieldrin 1.91 0.239 55.0 145

7540 µg/L Endrin 0.632 0.133 70.0 130

7685 µg/L Heptachlor 1.78 0.213 55.0 145

7690 µg/L Heptachlor…

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