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AccreditorsEvaluations of this dataset will be sent to the accreditor(s) listed below using your laboratory's labcode listed above eachaccrediting agency. If any of the information listed below is incorrect, please contact RTC immediately.

RTC is accrediated to perform PT programs for the scope of accredation to ISO/IEC 17043 underACLASS certificate AP-1469

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Minerals

Method:EPA 200.7 [10013408]

Analyte ResultUnits

AssignedValue

Accept.Window Z Evaluation

Bromide 1,2 2.50 mg/L 2.36 1.8 to 2.92 0.75 Acceptable1540 / PE1060-20ML - Lot LRAA0231/Analyst:CR/ Analysis Date: 2014-10-08 Evaluation Criteria - 1 Evalaution Parameter - a:1.0098, b:-0.0533,

c:0.0400, d:0.0912

Total Solids (TS) 1,2 264 mg/L 262 217 to 307 0.13 Acceptable1950 / PE3050-500ML - Lot LRAA0265/Analyst:CR/ Analysis Date: 2014-10-08 Evaluation Criteria - 1 Evalaution Parameter - a:1.00, b:0.00, c:0.00,

d:15.0

Method:EPA 365.2 [10070209]

Analyte ResultUnits

AssignedValue

Accept.Window Z Evaluation

Sodium, Na 1,2 19.8 mg/L 20.6 16.5 to24.7 -0.58 Acceptable

1155 / PE1041-1KT - Lot LRAA1130/Analyst:CR/ Analysis Date: 2014-10-08 Evaluation Criteria - 1 Evalaution Parameter - a:1, b:0, c:0.0666, d:0

Alkalinity as CaCO3 1,2 42.8 mg/L 44.6 37.9 to

51.3 -0.87 Acceptable

1505 / PE1041-1KT - Lot LRAA1130/Analyst:CR/ Analysis Date: 2014-10-08 Evaluation Criteria - 4 Evalaution Parameter - break:40,

highPercentage:0.15, lowPercentage:0.20

Method:SM 3111 B 20th ED (1993) [20055009]

Analyte ResultUnits

AssignedValue

Accept.Window Z Evaluation

Bromide 1,2 2.22 mg/L 2.36 1.8 to 2.92 -0.75 Acceptable1540 / PE1060-20ML - Lot LRAA0231/Analyst:CR/ Analysis Date: 2014-12-09 Evaluation Criteria - 1 Evalaution Parameter - a:1.0098, b:-0.0533,

c:0.0400, d:0.0912

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Nutrients

Method:EPA 200.7 [10013408]

Analyte ResultUnits

AssignedValue

Accept.Window Z Evaluation

Nitrate as N 1,2 20.9 mg/L 21.5 18.1 to 25 -0.52 Acceptable1810 / PE1060-20ML - Lot LRAA0231/Analyst:CR/ Analysis Date: 2014-10-08 Evaluation Criteria - 1 Evalaution Parameter - a:0.9975, b:-0.0005,

c:0.0506, d:0.0642

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Sample Information

MINERALS - WPPE1041-1KT / Lot LRAA1130

Analytes Units GravimetricValue Study Mean Study Std. Dev.

Calcium, Ca 1,2

1035 Minerals mg/L 66.0±0.337 0 0

Magnesium, Mg 1,2

1085 Minerals mg/L 6.85±0.035 0 0

Potassium, K 1,2

1125 Minerals mg/L 29.6±0.151 0 0

Sodium, Na 1,2

1155 Minerals mg/L 20.6±0.105 20.8 2.1

Alkalinity as CaCO3 1,2

1505 Minerals mg/L 44.6±0.228 45.5 2.06

Calcium hardness as CaCO3 1,2

1550 Minerals mg/L 165±0.84 0 0

Specific conductance, Conductivity (25ºC) 1,2

1610 Minerals umhos/cm 640±3.65 0 0

Hardness 2

1750 Minerals mg/L 193±0.984 0 0

Hardness, total as CaCO3 1,2

1755 Minerals mg/L 193±0.984 0 0

Calcium, Ca 1,2

1035 mg/L 66.0±0.337 0 0

Magnesium, Mg 1,2

1085 mg/L 6.85±0.035 0 0

Potassium, K 1,2

1125 mg/L 29.6±0.151 0 0

Sodium, Na 1,2

1155 mg/L 20.6±0.105 20.8 2.1

Alkalinity as CaCO3 1,2

1505 mg/L 44.6±0.228 45.5 2.06

Calcium hardness as CaCO3 1,2

1550 mg/L 165±0.84 0 0

Specific conductance, Conductivity (25ºC) 1,2

1610 umhos/cm 640±3.65 0 0

Hardness, total as CaCO3 1,2

1755 mg/L 193±0.984 0 0

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RESIDUE - WPPE3050-500ML / Lot LRAA0265

Analytes Units GravimetricValue Study Mean Study Std. Dev.

Total Solids (TS) 1,2

1950 Minerals mg/L 262±1.34 260 8.3

Total Dissolved Solids at 180ºC (TDS) 1,2

1955 Minerals mg/L 227±1.16 0 0

Total Suspended Solids, Non-Filterable Residue (TSS) 1,2

1960 Miscellaneous Analytes mg/L 34.1±0.179 0 0

Total Solids (TS) 1,2

1950 mg/L 262±1.34 260 8.3

Total Dissolved Solids at 180ºC (TDS) 1,2

1955 mg/L 227±1.16 0 0

Total Suspended Solids, Non-Filterable Residue (TSS) 1,2

1960 mg/L 34.1±0.179 0 0

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ANIONS - WPPE1060-20ML / Lot LRAA0231

Analytes Units GravimetricValue Study Mean Study Std. Dev.

Bromide 1,2

1540 Minerals mg/L 2.39±0.0122 2.37 0.33

Chloride 1,2

1575 Minerals mg/L 104±0.532 0 0

Fluoride 1,2

1730 Minerals mg/L 2.64±0.0134 0 0

Nitrate as NO3 1,2

1805 Nutrients mg/L 95.7±0.488 0 0

Nitrate as N 1,2

1810 Nutrients mg/L 21.6±0.11 22.4 1.12

Nitrate+nitrite as N 1,2

1820 Nutrients mg/L 24.6±0.125 0 0

Nitrite as NO2 1,2

1835 Nutrients mg/L 9.92±0.0506 0 0

Nitrite as N 1,2

1840 Nutrients mg/L 3.02±0.0154 0 0

Orthophosphate as P 1,2

1870 Nutrients mg/L 2.39±0.0122 0 0

Sulfate 1,2

2000 Minerals mg/L 18.8±0.0961 0 0

Bromide 1,2

1540 Miscellaneous Analytes mg/L 2.39±0.0122 2.37 0.33

Chloride 1,2

1575 Miscellaneous Analytes mg/L 104±0.532 0 0

Fluoride 1,2

1730 Miscellaneous Analytes mg/L 2.64±0.0134 0 0

Nitrate as N 1,2

1810 Miscellaneous Analytes mg/L 21.6±0.11 22.4 1.12

Nitrate+nitrite as N 1,2

1820 Miscellaneous Analytes mg/L 24.6±0.125 0 0

Nitrite as N 1,2

1840 Miscellaneous Analytes mg/L 3.02±0.0154 0 0

Orthophosphate as P 1,2

1870 Miscellaneous Analytes mg/L 2.39±0.0122 0 0

Sulfate 1,2

2000 Miscellaneous Analytes mg/L 18.8±0.0961 0 0

Bromide 1,2

1540 Anions - Waste Water mg/L 2.39±0.0122 2.37 0.33

Chloride 1,2

1575 Anions - Waste Water mg/L 104±0.532 0 0

Fluoride 1,2

1730 Anions - Waste Water mg/L 2.64±0.0134 0 0

Nitrate as NO3 1,2

1805 Anions - Waste Water mg/L 95.7±0.488 0 0

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Nitrate as N 1,2

1810 Anions - Waste Water mg/L 21.6±0.11 22.4 1.12

Nitrate+nitrite as N 1,2

1820 Anions - Waste Water mg/L 24.6±0.125 0 0

Nitrite as NO2 1,2

1835 Anions - Waste Water mg/L 9.92±0.0506 0 0

Nitrite as N 1,2

1840 Anions - Waste Water mg/L 3.02±0.0154 0 0

Orthophosphate as P 1,2

1870 Anions - Waste Water mg/L 2.39±0.0122 0 0

Sulfate 1,2

2000 Anions - Waste Water mg/L 18.8±0.0961 0 0

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Definitions and Interpretation of Statistical Analysis:

Assigned Value: Value attributed to a particular quantity and accepted, sometimes by convention, ashaving an uncertainty appropriate for a given purpose. See ISO/IEC 17043 for additional information. Ingeneral the assigned value is the value used to assess proficiency and may or may not be the made to value(gravimetric value).

Accept. Window: The range of values that constitute acceptable performance for a laboratory participatingin this PT study.

Z: A Z-Score tells how a single data point compares to normal data. A Z-Score says not only whether a pointwas above or below average, but how unusual the measurement is. Generally, a method result with aZ-Score less than |2| is considered to be in control, a Z-Score between |2| and |3| is considered’Questionable’, but still within control and a Z greater than |3| is considered not acceptable and the methodis out of control. For WS studies, a z-score greater than |2| is unacceptable. Calculated as Z = (ReportedValue - Assigned Value) / Proficiency Std. Dev.

Proficiency Std. Dev.: Standard deviation calculated based on Evaluation Criteria.

Study Mean: Statistical study mean calculated using a robust statisitical model (RTC employs the’Biweight Program’). Robust statistical techniques to minimize the influence that extreme results can haveon estimates of the mean and standard deviation. NOTE - These techniques assign less weight to extremeresults, rather than eliminate them from a data set.

Study Std. Dev.: Standard deviation calculated from study data using robust statisicals (Biweight).

Gravimetric Value: The ’prepared to’ value, determined by gravimetric means. The uncertainty associatedto this value is standard uncertainty and based on RTC’s gravimetric tolerances.

Evaluation Criteria:

1 - Regression Equation - Acceptance windows based on TNI adopted equation of proficiency value +/- 3proficiency standard deviations and check limits of proficiency value +/- 2 proficiency standard deviations.Proficiency value and proficiency standard deviation are calculated from gravimetric variables a, b, c, & das proficiency value = a * gravimetric + b and proficiency standard deviation = c * gravimetric + d.

2 - Study Robust Mean and c,d regression - Acceptance windows based on TNI adopted equation ofproficiency value +/- 3 proficiency standard deviations and check limits of proficiency value +/- 2proficiency standard deviations. Proficiency value and proficiency standard deviation calculated from robuststudy mean and variables c & d as proficiency value = robust mean and proficiency standard deviation = c *proficiency value + d.

3 - Fixed Limits - Acceptance windows based on span of gravimetric percentage from gravimetric asgravimetric +/- gravimetric * percentage.

4 - Adjustable Fixed Limits - Acceptance windows base on a span of gravimetric percentage fromgravimetric as gravimetric +/- gravimetric * lowPercentage where gravimetric < break and gravimetric +/-

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gravimetric * highPercentage where gravimetric >= break.

5 - Study Statistics - Acceptance windows based on a number of standard deviations span from the studymean as study mean +/- (deviations * standard deviation).

6 - Log Transform Statistics - Acceptance windows based on lognormal distributed data. Acceptancewindows = mean(lognormal) +/- span * standard deviation(lognormal).

7 - Reserved

8 - Regression Equation 2SD - Acceptance windows based on EPA equation of proficiency value +/- 2proficiency standard deviations. Proficiency value and proficiency standard deviation are calculated fromgravimetric variables a, b, c, & d as proficiency value = a * gravimetric + b and proficiency standarddeviation = c * gravimetric + d. Generally reserved for drinking water studies.

Proficiency Test Item Preparation, Homogeneity and Stability Assessment - RTC uses proprietaryand published methods for the manufacture, homogeneity and stability testing of proficiency test items.RTC’s proficiency test materials meet requirements of ISO Guide 34. For more information contact RTC.Additionally RTC complies with TNI Volume 3 ’General Requirements for Environmental Proficiency TestProviders’, EL-V3-2009, 2009 for all TNI Fields of Proficiency Testing analytes.

Metrological Traceability - All preparations are made using balances calibrated annually traceable toNIST standards. Where appropriate analytical measurements are traceable through an unbroken chain toNIST standards, or a Certified Reference Material manufactured under ISO Guide 34 in conjunction withISO/IEC 17025.

Statistical Analysis - RTC uses robust statistics to calculate study means and standard deviations -Reference - Kafadar, K, A Biweight Approach to the One-Sample Problem, Journal of the AmericanStatistical Association, Vol. 77, No. 378, June, 1982, pp. 416-424.

Additional Information - Go to www.rt-corp.com/reporting for additional information on summarystatistics for specific methods, advice on the interpretation of the statistical analysis, and additionalcomments/recommendations. If you failed an analyte it may be required to perform a corrective actionand/or retest. RTC recommends that you contact your accreditation body for specific instruction.

Program analyte accrediting footnotes1 NELAC Compliant, covered by RTC’s ACLASS Proficiency Testing Provider accreditation, Cert. AP-14692 ISO 17043 Accredited, covered by RTC’s ACLASS Proficiency Testing Provider accreditation, CertAP-1469

Authorizing Officer:

Date: 12/9/2014

Patrick Brumfield, ASQ CQA

QA Manager

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This section of the report is for informational purposes only. If you are unsure aboutspecific accreditation requirements, please contact your state coordinator.

UNACCEPTABLE ANALYTES

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PASS RATE

Number of Reported Results: 6

Number of Passing Results: 6

Pass Rate: 100%

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