47
www.labsmartservices.com.au PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING PROGRAM REPORT Accredited for compliance with ISO/IEC 17043 Copyright: LabSmart Services Pty Ltd PSD & Moisture Content - Proficiency Testing Program - 2019 (86) Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 1 of 47

PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

  • Upload
    others

  • View
    11

  • Download
    0

Embed Size (px)

Citation preview

Page 1: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

www.labsmartservices.com.au

PSD & Moisture Content - 2019 (86)

PROFICIENCY TESTING

PROGRAM REPORT

Accredited for compliance with ISO/IEC 17043

Copyright: LabSmart Services Pty Ltd

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 1 of 47

Page 2: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Report This report is available on the LabSmart Services website. The issue of this proficiency report was authorised by Peter Young, Director, LabSmart Services Pty Ltd, May 2019. Contact Details

Email: [email protected] Mobile: 0432 767 706 Fax: (03) 8888 4987

Program Coordinator The program coordinator for this program was Peter Young, Director, LabSmart Services Pty Ltd. Contact Details

Email: [email protected] Mobile: 0432 767 706 Fax: (03) 8888 4987

Please note that any technical questions regarding this program are to be directed to the program coordinator.

Z-scores Summary A z-scores summary for this program was issued in 28 April 2019. This technical report supersedes the z-sores summary.

Accredited Proficiency Testing Provider LabSmart Services is accredited by NATA to ISO/IEC 17043, Conformity assessment – General requirements for proficiency testing. Accreditation number 19235. The accreditation provides additional assurance to participants of the quality and importance we place on our proficiency testing programs.

LabSmart Services Further information regarding LabSmart Services proficiency testing programs can be found on our website.

www.labsmartservices.com.au

Copyright This work is copyright. No part of this publication may be reproduced in any form, transmitted or stored in any repository (e.g. mechanical, digital, electronic or photographic) without prior written permission of LabSmart Services Pty Ltd. Please contact LabSmart Services should you wish to reproduce any part of this report.

Amendment History Reports may be downloaded from the LabSmart Services website.

Version 1 – Issued 21 May 2019

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 2 of 47

Page 3: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

CONTENTS PAGE

1. Program Aim

4

2. Performance?

2.1 Identified Outliers 2.2 Overall Performance

4

4 5

3. Technical Comment

3.1 Material less than 75 µm (Washed) 3.2 Particle size distribution 3.3 Moisture content

8

8 10 14

4. Material finer than 75 µm (Washed)

4.1 Z-Scores & Graph

16

16

5. Particle Size Distribution (% Passing)

5.1 Z-scores & graph for 2.36 mm sieve 5.2 Z-scores & graph for 1.18 mm sieve 5.3 Z-scores & graph for 600 μm sieve 5.4 Z-scores & graph for 425 μm sieve 5.5 Z-scores & graph for 300 μm sieve 5.6 Z-scores & graph for 150 μm sieve 5.7 Z-scores & graph for 75 μm sieve

18

18 20 22 24 26 28 30

6. Moisture Content

6.1 Z-Scores & Graph

32

32

7. Program Information

7.1 Z-Score Summary 7.2 Program Design 7.3 Sample Preparation 7.4 Packaging and Instructions 7.5 Quarantine 7.6 Sample Despatch 7.7 Homogeneity Testing 7.8 Participation 7.9 Statistics 7.10 Non-statistical Matters

34

34 34 37 38 38 38 38 40 40 42

Appendix A Instructions for testers Appendix B Results log Appendix C Participant results

43

45

46

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 3 of 47

Page 4: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

1. Program Aim The proficiency program was conducted in March/April 2019 with thirty-three participants throughout Australia. The program involved the performance of AS 1289 3.6.1, Determination of the particle size distribution of a soil and AS 1289 2.1.1, Determination of the moisture content of a soil – Oven drying method.

The program provides confidence to the construction materials testing industry regarding the competency of participants (and the industry) to perform these tests. Each participant’s performance is statistically assessed and used as a measure of competency relative to all those who participated. Other measures of performance may also be used. This report has been prepared using robust statistics. Information regarding the conduct and design of the program can be found in section 7. Comprehensive technical comment (section 3) is provided to assist participants improve the overall performance of these tests. In addition, test data has been reviewed for consistency and additional feedback regarding aspects of the test are provided.

2. How well did we perform? 2.1 Identified Outliers The results and statistical analysis of participant’s; Material less than 75 μm (washed) results, PSD results and moisture content results are detailed in sections 4,5 and 6 respectively. There were 14 outliers identified across the tests performed. These were spread across 5 participants. This represented 15% of the 33 participants (1,2) who returned results in the proficiency program (Table 2.1A). Participant’s test results are tabulated in sections 4, 5 and 6 along with the robust statistics and z-score graphs. The z-score indicates how far away a participant is from the program’s median value. A z-score of zero indicates a strong consensus with respect to all other participants and represents a very good outcome. The z-score graph gives a quick visual indication of how a result compares to others in the program. Outliers are where a z-score value is equal to or greater than 3 or less than or equal to -3. It is strongly recommended that participants with outliers investigate their performance of the test. Participants with outliers are detailed in table 2.1A. Those participants with z-scores greater than 2 or less than -2 should review their testing methodology. Only those approaching a z-score of 3 (i.e. outside ± 2.75) have been specifically identified in table 2.1A as feedback. More detail on the robust statistics used can be found in section 7.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 4 of 47

Page 5: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Technical comment and feedback in section 3 is provided to assist participants investigate or review their results as well for those seeking to improve their testing performance.

Table 2.1A Participant codes where remedial action is recommended based on z-scores. Those with a z-score that was close to 2.75 should review their results. See section 3 for further comments.

2.2 Overall Performance Overall a satisfactory level of performance (1) was achieved by the majority (85%) of participants with 15% having one or more outliers (2). The performance by participants is very good overall and compares favourably with previous proficiency programs. Different soil samples will yield different variation for each fraction according to material quantity and type. The performance by participants is consistent with previous programs. The variation in test results in this program are similar to those of previous programs as summarised in table 2.2A. This is a good outcome. Competency of washing was assessed through the calculation of a ‘washed material finer than 75 μm’ result. Although not a reportable result under the test method the mass of the washed material is still accountable within the test and competency of washing is an important aspect of the test. Most participants completed the washing satisfactorily. The spread in results for ‘washed - material finer than 75 μm’ was very good. There is an opportunity for laboratories to improve. The data indicates that there is considerable room for improvement in the use of ‘check sums’ and the checking process employed by technicians and supervisors.

Sample Test Investigate Review

A

Less than 75 µm (by washing) - -

Particle size distribution (% Passing)

2.36 mm G4 -

1.18 mm G4 -

600 μm G4 -

425 μm G4 B9

300 μm G4, K7 -

150 μm G4, K7, X8 -

75 μm K7, X8 -

B Moisture content K7, B9, X2 -

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 5 of 47

Page 6: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

There was a significant number of errors made by participants in the calculations (based on data provided and assumed to be correct). In many cases this often caused a poorer outcome. In other instance it threw doubt on some outcomes, that when recalculated, may have resulted in outliers. It is something laboratories should continue to work towards improving.

Table 2.2A Comparison of performance outcomes over the last five programs.

The determination of moisture content (Sample B) by participants was very good with a very low standard derivation. A very good outcome. Section 3 provides technical comment which may be useful in identifying possible areas for improvement as well as for investigating outliers. The proficiency program allows many of the laboratories to have greater confidence in their results while for others providing an opportunity to improve their competency with respect to the test in this program.

Sample Test

2015 2016 2017 2018 2019

% CV

A

Less than 75 µm (by washing) 14 15 15 21 22

Particle size distribution (% Passing)

2.36 mm 0.4 0.6 0.4 1.3 2.7

1.18 mm 0.6 1.0 0.9 1.6 4.3

600 μm 1.2 1.7 1.9 3.0 4.6

425 μm 2.3 2.3 3.1 3.4 3.7

300 μm 4.8 4.0 4.5 4.3 4.3

150 μm 9.0 9.3 7.9 7.9 7.1

75 μm 12 14 16 15 20

B Moisture content 2.3 1.5 0.8 1.2 0.9

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 6 of 47

Page 7: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

The following is a summary of some of the statistics for this program.

Sample Test Units Participants Median Normalised

IQR

A

Less than 75 µm (by washing) % 31 2.3 0.5

Particle size distribution (% Passing)

% 33

2.36 mm 77.2 2.1

1.18 mm 52.1 2.2

600 μm 32.1 1.5

425 μm 23.4 0.9

300 μm 16.0 0.7

150 μm 6.3 0.4

75 μm 2.7 0.5

B Moisture content % 33 19.0 0.17

Table 2.2A Summary of test result statistics from the 2019 program. Results have been rounded.

(1) Overall performance outcomes can vary from one program to another and should not be

taken as either an improvement or deterioration in industry performance. Variation in program outcomes may be attributed to the difficulty of the material under test or where participants overall in one program may have more experience or greater skill levels than those in another program. Evaluation of industry performance endeavours to balance these issues. Industry outcomes and individual performance outcomes are detailed in section sections 3 through 6.

(2) Statistics relating to the number of outliers or participation rates are intended as an overview only for the program. They are calculated based on the total number of participants, however not all participants perform each test or return all results.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 7 of 47

Page 8: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

3 Technical comment Please note that the feedback in this section is aimed at providing information that can assist participants and laboratories to improve laboratory operations. All participants identified below are considered to have successfully completed the program unless otherwise identified in section 2. Each submission was assessed to provide additional feedback to participants. Results submitted by participants (Appendix C) were checked and in many cases recalculated. The data submitted on the program log sheet should agree with the results provided. In other words, the ‘mass retained’ value should match the reported ‘% passing’ value. Much of the technical comment deals with inconsistencies around the submitted data. It is apparent that many participants did not perform sufficient checks such as ‘Check Sums”. There is sufficient material provided for ‘Sample A’ to perform the test more than once. In many instances checks, had they been performed, would have indicated that retesting may have been warranted. In checking participant’s data, it is often difficult to determine exactly what may be incorrect. The following comments should be taken as guide towards reviewing submitted results. Incorrect results do not necessarily mean they will be an outlier. Many of the participants identified below may not have shown up as outliers but the results may still be incorrect. In some cases participants did not submit all the data requested so results for these participants could not be fully checked. Those with outliers or those that are mentioned on more than one occasion below would benefit from reviewing their results. Note: In the following sections I2I is used as a shorthand way of indicating a positive and negative z-score e.g. -2 and 2 and similarly I1I indicates a z-score of -1 and 1. 3.1 Material less than 75 µm (Washed) Washing is important as it can have a large impact on accuracy of the results obtained. The more material washed through the 75 µm the greater the influence. The ‘material less than 75 µm -washed’, ‘% Passing the 75 µm’ and the pan data are all linked. Reviewing them together is one indicator of how well the sieving-wash process has been performed. Washing It is important that laboratories can wash a sample thoroughly and not loose material. The particle size distribution test method incorporates both washed and unwashed samples. The test method does not specifically calculate the amount of material ‘washed out’ of the sample. However, it is relevant to

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 8 of 47

Page 9: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

include the mass of the material obtained from the washing process in the ‘check sum’ determination. Loss of material, incomplete washing or inaccurate drying will significantly affect the results obtained. For this proficiency program the calculation of a ‘washed - less than 75 μm’ result has been used as a measure of competency for the ‘washing’ process.

• It is expected that the material retained in the pan should be small and therefore the ‘% Passing the 75µm’ sieve amount should be very similar to the ‘Material passing the 75µm sieve’ obtained from the PSD determination.

Also, it would be expected in most situations that the ‘% passing the 75 µm sieve’ should be greater than the % washed by a slight amount. Such comparison should be incorporated into the ‘check sum’ process. The following participants had results that appeared at odds with these checks.

‘Material finer than 75µm – washed’ was greater than ‘% Passing the 75µm’ results. Calculation error?

K7 & X8

There were some others identified but due to insufficient decimal places reported further comment was not possible.

• Difference between ‘% Passing the 75µm’ and ‘Material finer than 75µm – washed’ is greater than 1%. Incomplete washing? Calculation error?

G6, K7 & X8 Two other participants E2 & K2 were approaching the 1%

There were no outliers identified for “Material less than 75 um (washed)” which is a very good outcome. Section 4.1 details the statistical analysis performed on participant’s results. The participants identified above with results that were at odds with other participants did not have outliers from the washing process but did so for the PSD part of the program. The standard deviation of participants is around 0.5%. Overall all participants were within 1 standard deviation, except G4, which is a good outcome. Pan The amount of material left in the pan after sieving can be used as an indication of how well the washing process has been performed. It is also an indication as to how much some of the material breaks down during sieving. The soil sample may contain both hard and soft particles. If a high pan weight is obtained, then how much of the material broke down needs to be considered and why. Did it break down easily because that was

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 9 of 47

Page 10: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

the type of material it was? Feeling the hardness of individual particles in larger fractions can help with this. Observing what sort of particles pass through when hand sieving also helps. It could also be due to too rough a washing process. If it was felt that the material did not break down sufficiently to account for the pan weight obtained, then incomplete washing may need to be considered. There was a registerable and consistent amount of fine material in this sample requiring careful washing. Based on the homogeneity data the material appeared to break down slightly during sieving with some making its way as far as the pan. Homogeneity pan weights were below 0.5% retained or 05 to 2g for a 425g sample. Most participants had realistic pan amounts. The following participants had pan amounts > 0.5% retained and may wish to review the result obtained. G6 & E2 Participants with z-scores between -1 and 1 performed the washing process very well compared to other participants. Those with z-scores above 1 may have lost material in the washing process or have a damaged/worn sieve (K5). There were some that rounded to the nearest 1% that showed up as a z-score greater than 1. These were recalculated based on the data supplied as shown in table 3.1A.

Code Submitted Recalculated Difference

P4 3 2.30 -0.70

C8 3 3.90 0.90

B5 3 3.82 0.82

G4 1.3 2.46 1.16

Table 3.1A Recalculated – Material finer than 75 um (%)

P4 without rounding would have had a much better z-score. Participants C8 and B5 appear to have not rounded correctly and if the recalculated results are correct may have come close to being outliers in the program. Those with a z-score less than -1 may not have washed sufficiently or a calculation error (E2 & G4). From table 3.1A, participant G4 may have a result that may have been satisfactory. Overall the washing process was very well done with most participants under a z-score of 1. 3.2 Particle size distribution There were 11 outliers identified involving 3 participants (9%) for the combined washing and PSD participants. Those with outliers had more than one outlier. The outliers are summarised in table 3.2A.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 10 of 47

Page 11: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Start Weight Participants were asked to use a 400g sample. Nominating a start mass helps ensure that participants are not disadvantaged using too little material or too much. Too small a subsample is less forgiving should there be any separation or loss in the material being sieved. There were 4 participants that used a starting weight that was either less than 350g or greater than 450g. Sieving a ‘split’ sub-sample Most participants (615) used 200 mm diameter sieves with less than 10% using 300 mm diameter sieves. One participant used 150 mm diameter sieve set and 8 (24%) used a combination (300/200 mm). For some fractions the mass retained would have overloaded the sieve and the material needed to be sieved in two passes or split. Often it is better to sieve in two passes material that is close to the nominated overload weights. The sieving method refers to AS 1289.1.1 for the appropriate sample size. As previously explained above this program required a 400g sample to be used.

Code Washing 2.36 1.18 600 425 300 150 75

G4 K7 X8

Table 3.2A Summary of outliers (Shaded) for PSD.

The test method does not indicate when it is appropriate to split a sample. Many laboratories used 200mm sieves and most likely split the sample as this is the most efficient sieving approach (based on time taken). It may not necessarily be the most accurate approach. Quartering a sample down needs to be done carefully to obtain a representative sample. Splitting could under some situations decrease the overall accuracy if there has been a significant loss of material (or gain). In any sieving operation, the smaller the amount of material sieved the greater the effect of any loss or gain in material has on the result. Some participants indicated that a 200mm diameter sieve was used but it was not split perhaps indicating that it was sieved over more than one pass. Calculation of ‘% Passing’ Most participants returned results for ‘mass retained’ and ‘% Passing’ as requested. This was very good.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 11 of 47

Page 12: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

The calculation of percent passing was checked by recalculating from the submitted ‘mass retained’ data for each fraction. There were 33 participants, 67% whose results matched the recalculated value. Results that differed by more than 0.5 % were identified. The remaining participants (30%) had recalculated results that did not match the results shown. N6, M8, J6, C8, B5, F6, X8, L5, G4, L7 & X2 The ‘mass retained’ is primary data (i.e. not calculated) and hence participants should be able to transfer this data accurately to the proficiency testing log sheet. Participants need to understand the calculation process from primary data to ‘final’ result. It is suspected that there were errors in the data supplied in some cases while for others better performance would have resulted had the calculations been accurate. % Passing the 75 μm sieve There were two outliers identified for ‘% Passing the 75 μm sieve’. K7 & X8 G4 had a z-score greater than I2I and should review this outcome as well. See also comments under “Material less than 75 um (washed)”, section 3.1. Check Sums AS 1289 3.6.1, Clause 5.4(b) (i) Note 3 indicates that the sieved fractions plus washed material and pan should equal the starting mass to within ± 1 % retained. The ‘mass retained’ results were used to check how well participants met this requirement. The following participants appear to have an overall check sum greater than 1% and should review the calculations. N6, M8, J6, K7 & L5 It is suspected that there were errors in the data supplied in some cases while for others better performance would have resulted had the calculations been accurate. It is important to noted that ‘Check Sums’ can be (and should be) applied to other aspects of the calculation process. Incomplete sieving, lost material or excessive sieving Not easy to identify based on a single result. Obtaining nothing in the pan may be an indication. A proficiency program provides some feedback assuming the result has been calculated correctly.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 12 of 47

Page 13: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

If the sieving for a fraction is incomplete there would be more retained on a sieve and hence a larger ‘mass retained’ value. Less passes a sieve so a lower value for ‘% Passing’ is likely to be obtained compared to the median value shown for that fraction. This corresponds to a negative z-score. A positive z-score indicates that less was retained on the sieve (due to more complete sieving, too vigorous sieving or material was lost etc.) giving a higher ‘% Passing’ value compared to the median. Lost material shows up in the ‘check sum’ process. This material had a large amount of angular material that tended to bind in the sieves. Careful cleaning was needed to obtain accurate result. Not cleaning sieves is like losing material and should in most cases (i.e. sieves clean to start with) show up in the ‘check sum’ calculation. The above is an indication only as natural variation of each fraction within the proficiency sample supplied occurs. Very high or low z-scores are less affected by sample variation. This can provide a reasonable indication for ‘% Retained’ results but less effective for ‘% Passing’ as gains and loss can accumulate. Mechanical Sieving Of the 33 participants who performed the particle size distribution, 17 participants (52%) used a mechanical shaker. The time used varied from 7 to 15 minutes. Decimal places used The decimal places in use indicates broadly the accuracy and is related to the LOP. Understanding what is required and reporting on the log sheet correctly indicates a reasonable understanding of the test method. Most participants performed well on this aspect. A small number of participants had difficulty with the concept as indicated by the following:

• Did not putting anything on the log sheet

• LOP not matching the decimal places used

• Entering ‘balance resolution’ instead of LOP

The proficiency program requested results to be recorded to two decimal places (nearest 0.01) on the log sheet where possible. If you have a balance that reads only to 0.1g then the nearest 0.1g is reasonable. The proficiency program requests results to 0.01 where it is possible as it helps improve the quality of the feedback that can be given. There was a random change in the number of decimal places reported within some of the participant’s set of results. The most common were:

• Start mass to 1 decimal place the rest of the weights to 2 decimal places

• Weights to 1 decimal place while ‘% passing’ was to 2 decimal places

• Dropped numbers, most likely zeros at end of a number

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 13 of 47

Page 14: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

None of these are likely to have a significant impact on the results but it is preferable that participants understand the correct number of decimal places to use. The LOP of the balance indicates how many decimal places can reasonably be reported. The test method indicates the minimum requirements. Laboratories of course can use more accurate balances than this.

Test method

Max LOP Implied

Resolution Typical balance calibration

LOP

Course/Intermediate ±5g 1g ±2.4g

Fine ±0.5g 0.1g ±0.37g

More accurate ±0.05g 0.01g ±0.046g

For this program, the LOP was requested. Either the maximum LOP as per the standard or the actual balance calibration LOP was acceptable. Several participants would benefit from reviewing this aspect of the test. 3.3 Moisture content Sample B was double bagged, and each bag heat sealed. All participants indicated that the bag was satisfactorily sealed when received. Any loss of moisture during transit was therefore very unlikely. The sample was prepared with a moisture content of 19.48 ± < 0.02 %. A moisture content value less than this for the program could be expected due to evaporation during weighing and possible moisture adhering to the sample bag and other potential losses. Participants could elect to test the whole sample or a subsample. All the participants selected to test the whole sample. Participants were requested to report the ‘wet mass’ of the sample. Participants C8, F6 and X8 report weights more than the weight of sample sent indicating that the wet mass reported probably contained the weight of the “tray” used as well. These participants should review the process used. Depending on the weight of the sample used the test method allows a range of balance LOPs to be used. Many opted for a balance with a smaller LOP then required by the test method. It is recognised that most laboratories have an assigned balance and associated LOP allocated to this test. Sample A had a low MC and would show up if a participant accidently tested sample A instead of sample B. There were three outliers identified (K7, B9 & X2) for moisture content (9% of participants). Outliers need to be investigated and those above a z-score of I 2 I should review the result obtained as well (R9, U3).

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 14 of 47

Page 15: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Participants with high moisture content results (i.e. greater than 19.8%) should review results for transcription and calculation errors. This corresponds approximately to z-scores greater than 2.00. In this instance incorrect sampling (i.e. taking a subsample) would not have been an issue as all participants used all the sample provided to determine the moisture content. Participants with low moisture content results (i.e. z-score less than -2.00) should review results for transcription and calculation errors. Incomplete drying to constant mass may also contribute to a low result. A lengthy delay between opening the sample bag and recording the weight could lead to loss of moisture and a low moisture content result. Similarly, if wet material was left in the sample bag this could also affect the outcome achieved. Most participants had z-scores between ± 2 standard deviations. Overall participants outcomes were very good and similar to previous programs. The test method indicates rounding to the nearest 0.1% when reporting. The proficiency testing programs s.d of 0.17% is reasonable and within the expected range.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 15 of 47

Page 16: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 2.7 0.69 X2 2.0 -0.69

K5 3.14 1.56 U3 2.46 0.22

E3 2.3 -0.10 V6 1.85 -0.98

P8 2.72 0.73 K2 1.80 -1.08

N6 2.5 0.30 Q7 NR

Q2 2.7 0.69

W9 2.38 0.06

M8 2.61 0.51

R9 2.67 0.63

G6 2.00 -0.69

A8 2.55 0.39

T2 2.1 -0.49

J6 1.89 -0.91

G9 2.25 -0.20

P7 NR

Q8 2 -0.69

P4 3 1.28

C8 3 1.28

B5 3 1.28

K7 2.86 1.00

J2 1.918 -0.85

B9 2.35 0.00

F6 2.22 -0.26

X8 1.85 -0.98

L5 2.00 -0.69

E2 1.66 -1.36

G4 1.3 -2.07

L7 2.56 0.41

Number of results 31

Median 2.35

Median MU 0.11

First Quartile 2.00

Third Quartile 2.69

IQR 0.69

Normalised IQR 0.51

CV (%) 21.6

Minimum 1.30 ()

Maximum 3.14 ()

Range 1.84 ()

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

4.1 Sample A - Material finer than 75 µm (Washed): Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 16 of 47

Page 17: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

4.1 Sample A - Material finer than 75 µm (Washed): Z - Score Graph

K5

P4

C8

B5

K7

P8

Q9

Q2

R9

M8

L7

A8

N6

U3

W9

B9

E3

G9

F6

T2

G6

Q8

L5

X2

J2

J6

X8

V6

K2

E2

G4

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 17 of 47

Page 18: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 75 -1.05 X2 78.4 0.60

K5 78 0.41 U3 77 -0.08

E3 75 -1.05 V6 78.01 0.41

P8 73.15 -1.95 K2 76.80 -0.17

N6 74 -1.53 Q7 73.97 -1.55

Q2 79 0.89

W9 79.35 1.06

M8 75.37 -0.87

R9 81.16 1.94

G6 77.69 0.26

A8 77.16 0.00

T2 75.8 -0.66

J6 72.04 -2.48

G9 77.17 0.00

P7 78.15 0.48

Q8 77.6 0.21

P4 76 -0.56

C8 78 0.41

B5 78 0.41

K7 76.94 -0.11

J2 78.83 0.81

B9 79.88 1.32

F6 78.53 0.66

X8 79.64 1.20

L5 75 -1.05

E2 75.98 -0.57

G4 68.37 -4.27 #

L7 76.6 -0.27

Number of results 33

Median 77.16

Median MU 0.45

First Quartile 75.37

Third Quartile 78.15

IQR 2.78

Normalised IQR 2.06

CV (%) 2.7

Minimum 72.04 (68.37)

Maximum 81.16 (81.16)

Range 9.12 (12.79)

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

5.1 Sample A - % Passing 2.36 mm: Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 18 of 47

Page 19: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

5.1 Sample A - % Passing 2.36 mm: Z - Score Graph

R9

B9

X8

W9

Q2

J2

F6

X2

P7

V6

K5

C8

B5

G6

Q8

G9

A8

U3

K7

K2

L7

P4

E2

T2

M8

Q9

E3

L5

N6

Q7

P8

J6

G4

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 19 of 47

Page 20: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 51 -0.49 X2 52.3 0.09

K5 53 0.40 U3 52 -0.04

E3 50 -0.94 V6 52.87 0.35

P8 48.27 -1.72 K2 50.76 -0.60

N6 50 -0.94 Q7 48.48 -1.63

Q2 54 0.85

W9 54.01 0.86

M8 49.98 -0.95

R9 55.78 1.65

G6 51.65 -0.20

A8 52.81 0.32

T2 50.5 -0.72

J6 48.05 -1.82

G9 52.29 0.09

P7 52.70 0.27

Q8 53.0 0.40

P4 50 -0.94

C8 53 0.40

B5 54 0.85

K7 51.10 -0.45

J2 53.49 0.63

B9 54.70 1.17

F6 54.09 0.89

X8 53.70 0.72

L5 50 -0.94

E2 50.82 -0.58

G4 45.20 -3.10 #

L7 52.1 0.00

Number of results 33

Median 52.10

Median MU 0.48

First Quartile 50.00

Third Quartile 53.00

IQR 3.00

Normalised IQR 2.22

CV (%) 4.3

Minimum 48.05 (45.20)

Maximum 55.78 (55.78)

Range 7.73 (10.58)

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

5.2 Sample A - % Passing 1.18 mm: Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 20 of 47

Page 21: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

5.2 Sample A - % Passing 1.18 mm: Z - Score Graph

R9

B9

F6

W9

Q2

B5

X8

J2

K5

Q8

C8

V6

A8

P7

X2

G9

L7

U3

G6

K7

Q9

E2

K2

T2

E3

N6

P4

L5

M8

Q7

P8

J6

G4

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 21 of 47

Page 22: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 31 -0.74 X2 32.5 0.27

K5 33 0.61 U3 32 -0.07

E3 31 -0.74 V6 33.25 0.78

P8 30.54 -1.05 K2 32.48 0.26

N6 32 -0.07 Q7 30.42 -1.13

Q2 34 1.28

W9 33.47 0.92

M8 30.64 -0.98

R9 36.08 2.68

G6 31.44 -0.45

A8 33.63 1.03

T2 31.7 -0.27

J6 29.71 -1.61

G9 32.56 0.31

P7 32.25 0.10

Q8 32.1 0.00

P4 30 -1.42

C8 32 -0.07

B5 33 0.61

K7 30.64 -0.98

J2 32.84 0.50

B9 33.32 0.82

F6 33.81 1.15

X8 32.21 0.07

L5 30 -1.42

E2 31.16 -0.63

G4 27.21 -3.30 #

L7 33.5 0.94

Number of results 33

Median 32.10

Median MU 0.32

First Quartile 31.00

Third Quartile 33.00

IQR 2.00

Normalised IQR 1.48

CV (%) 4.6

Minimum 29.71 (27.21)

Maximum 36.08 (36.08)

Range 6.37 (8.87)

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

5.3 Sample A - % Passing 600 µm: Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 22 of 47

Page 23: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

5.3 Sample A - % Passing 600 µm: Z - Score Graph

R9

Q2

F6

A8

L7

W9

B9

V6

K5

B5

J2

G9

X2

K2

P7

X8

Q8

N6

C8

U3

T2

G6

E2

Q9

E3

M8

K7

P8

Q7

P4

L5

J6

G4

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 23 of 47

Page 24: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 23 -0.47 X2 23.4 0.00

K5 24 0.70 U3 23 -0.47

E3 23 -0.47 V6 24.76 1.58

P8 22.62 -0.91 K2 24.72 1.54

N6 23 -0.47 Q7 22.86 -0.63

Q2 25 1.86

W9 24.56 1.35

M8 22.94 -0.53

R9 25.62 2.58

G6 23.23 -0.20

A8 24.79 1.62

T2 23.0 -0.47

J6 21.70 -1.98

G9 24.10 0.81

P7 22.84 -0.65

Q8 24.0 0.70

P4 23 -0.47

C8 24 0.70

B5 25 1.86

K7 22.14 -1.47

J2 23.92 0.60

B9 21.01 -2.78

F6 24.53 1.31

X8 23.90 0.58

L5 22 -1.63

E2 23.66 0.30

G4 18.69 -5.48 #

L7 23.6 0.23

Number of results 33

Median 23.40

Median MU 0.19

First Quartile 22.94

Third Quartile 24.10

IQR 1.16

Normalised IQR 0.86

CV (%) 3.7

Minimum 21.01 (18.69)

Maximum 25.62 (25.62)

Range 4.61 (6.93)

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

5.4 Sample A - % Passing 425 µm: Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 24 of 47

Page 25: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

5.4 Sample A - % Passing 425 µm: Z - Score Graph

R9

Q2

B5

A8

V6

K2

W9

F6

G9

K5

Q8

C8

J2

X8

E2

L7

X2

G6

Q9

E3

N6

T2

P4

U3

M8

Q7

P7

P8

K7

L5

J6

B9

G4

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 25 of 47

Page 26: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 16 0.00 X2 16.2 0.29

K5 17 1.45 U3 16 0.00

E3 15 -1.45 V6 16.25 0.36

P8 15.48 -0.75 K2 16.12 0.17

N6 16 0.00 Q7 15.21 -1.15

Q2 17 1.45

W9 16.55 0.80

M8 15.54 -0.67

R9 17.01 1.47

G6 16.18 0.26

A8 16.34 0.49

T2 15.9 -0.15

J6 14.92 -1.57

G9 16.87 1.26

P7 15.27 -1.06

Q8 15.8 -0.29

P4 15 -1.45

C8 16 0.00

B5 16 0.00

K7 13.51 -3.61 #

J2 16.20 0.29

B9 16.07 0.10

F6 16.26 0.38

X8 14.89 -1.61

L5 15 -1.45

E2 15.81 -0.28

G4 11.95 -5.87 #

L7 16.2 0.29

Number of results 33

Median 16.00

Median MU 0.15

First Quartile 15.27

Third Quartile 16.20

IQR 0.93

Normalised IQR 0.69

CV (%) 4.3

Minimum 14.89 (11.95)

Maximum 17.01 (17.01)

Range 2.12 (5.06)

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

5.5 Sample A - % Passing 300 µm: Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 26 of 47

Page 27: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

5.5 Sample A - % Passing 300 µm: Z - Score Graph

R9

K5

Q2

G9

W9

A8

F6

V6

J2

L7

X2

G6

K2

B9

Q9

N6

C8

B5

U3

T2

E2

Q8

M8

P8

P7

Q7

E3

P4

L5

J6

X8

K7

G4

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 27 of 47

Page 28: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 7 1.64 X2 6.6 0.74

K5 7 1.64 U3 6 -0.61

E3 6 -0.61 V6 6.47 0.45

P8 6.57 0.67 K2 6.43 0.36

N6 6 -0.61 Q7 6.27 0.00

Q2 7 1.64

W9 6.22 -0.11

M8 6.26 -0.02

R9 7.01 1.66

G6 6.75 1.08

A8 6.37 0.22

T2 6.3 0.07

J6 5.65 -1.39

G9 6.74 1.06

P7 5.81 -1.03

Q8 6.2 -0.16

P4 6 -0.61

C8 6 -0.61

B5 6 -0.61

K7 3.94 -5.24 #

J2 6.09 -0.40

B9 6.46 0.43

F6 6.93 1.48

X8 4.80 -3.31 #

L5 6 -0.61

E2 6.68 0.92

G4 3.90 -5.33 #

L7 6.4 0.29

Number of results 33

Median 6.27

Median MU 0.10

First Quartile 6.00

Third Quartile 6.60

IQR 0.60

Normalised IQR 0.44

CV (%) 7.1

Minimum 5.65 (3.90)

Maximum 7.01 (7.01)

Range 1.36 (3.11)

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

5.6 Sample A - % Passing 150 µm: Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 28 of 47

Page 29: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

5.6 Sample A - % Passing 150 µm: Z - Score Graph

R9

Q9

K5

Q2

F6

G6

G9

E2

X2

P8

V6

B9

K2

L7

A8

T2

Q7

M8

W9

Q8

J2

E3

N6

P4

C8

B5

L5

U3

P7

J6

X8

K7

G4

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 29 of 47

Page 30: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 3 0.67 X2 2.7 0.10

K5 3 0.67 U3 3 0.67

E3 2 -1.25 V6 2.56 -0.17

P8 2.81 0.31 K2 2.68 0.06

N6 3 0.67 Q7 2.64 -0.02

Q2 3 0.67

W9 2.61 -0.08

M8 2.61 -0.08

R9 3.03 0.73

G6 2.95 0.58

A8 2.65 0.00

T2 2.5 -0.29

J6 2.08 -1.10

G9 2.65 0.00

P7 2.27 -0.73

Q8 2.3 -0.67

P4 3 0.67

C8 3 0.67

B5 3 0.67

K7 0.13 -4.86 #

J2 2.15 -0.96

B9 2.74 0.17

F6 2.82 0.33

X8 0.29 -4.55 #

L5 2 -1.25

E2 2.63 -0.04

G4 1.27 -2.66

L7 2.9 0.48

Number of results 33

Median 2.65

Median MU 0.11

First Quartile 2.30

Third Quartile 3.00

IQR 0.70

Normalised IQR 0.52

CV (%) 19.6

Minimum 1.27 (0.13)

Maximum 3.03 (3.03)

Range 1.76 (2.90)

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

5.7 Sample A - % Passing 75 µm: Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 30 of 47

Page 31: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

5.7 Sample A - % Passing 75 µm: Z - Score Graph

R9

Q9

K5

N6

Q2

P4

C8

B5

U3

G6

L7

F6

P8

B9

X2

K2

A8

G9

Q7

E2

W9

M8

V6

T2

Q8

P7

J2

J6

E3

L5

G4

X8

K7

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 31 of 47

Page 32: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

% %

Q9 19.0 0.00 X2 16.2 -16.42 #

K5 19.2 1.17 U3 18.6 -2.35

E3 19.02 0.12 V6 18.93 -0.41

P8 19.11 0.65 K2 18.91 -0.53

N6 19.09 0.53 Q7 18.87 -0.76

Q2 19.2 1.17

W9 18.94 -0.35

M8 19.04 0.23

R9 18.61 -2.29

G6 18.81 -1.11

A8 19.34 1.99

T2 19.24 1.41

J6 19.13 0.76

G9 19.18 1.06

P7 18.80 -1.17

Q8 18.8 -1.17

P4 19.10 0.59

C8 19.0 0.00

B5 19.04 0.23

K7 18.36 -3.75 #

J2 19.20 1.17

B9 20.20 7.04 #

F6 18.99 -0.06

X8 18.88 -0.70

L5 18.94 -0.35

E2 19.10 0.59

G4 19.0 0.00

L7 19.1 0.59

Number of results 33

Median 19.00

Median MU 0.04

First Quartile 18.88

Third Quartile 19.11

IQR 0.23

Normalised IQR 0.17

CV (%) 0.9

Minimum 18.60 (16.20)

Maximum 19.34 (20.20)

Range 0.74 (4.00)

Note: A # indicates an outlier where the z-score obtained is either greater then

3 or less than -3. Codes for all participates are shown. The results column

shows a blank entry or 'NR' for those participants that did not submit a result for

this test. Results in green have been calculated by the program coordinator.

Minimum, Maximum and Range are calculated with outliers excluded, those in

brackets include outliers.

6.1 Sample B - Moisture Content: Z - Scores

Code Z Score Code Z Score

Statistic Value

Test

Result

Test

Result

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 32 of 47

Page 33: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

ReviewWeak

Consensus

Weak

ConsensusReview

Z-score

Strong Consensus

6.1 Sample B - Moisture Content: Z - Score Graph

B9

A8

T2

K5

Q2

J2

G9

J6

P8

P4

E2

L7

N6

M8

B5

E3

Q9

C8

G4

F6

W9

L5

V6

K2

X8

Q7

G6

P7

Q8

R9

U3

K7

X2

-3 -2 -1 0 1 2 3

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 33 of 47

Page 34: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

7. Program Information

7.1 Z-score Summary The proficiency program was conducted over March/April 2019. A ‘Z-score Summary’ was issued on the 28 April 2019 and posted on the LabSmart Services web site. The summary was also e-mailed to participants. The summary is intended as an early indicator of participant performance. The proficiency testing program report supersedes the z-score summary. Further information can be found in section 7.9 ‘Statistics’.

7.2 Program Design 7.2.1 Design

The program has been designed so that the level of experience/skill need to perform these tests will present a reasonable assessment of the overall competency of the tester and industry performance. Sample A - PSD

Part of the design of each program involves determining what information needs to be requested to allow for the correct analysis of the data collected. This allows the best possible feedback to be offered to enable participants to improve in the performance of this test. The ‘retained mass’ for PSD is used for this purpose. In designing a proficiency program, it is sometimes necessary to minimise the effect of some inherent test method variability. Sufficient sample was provided to allow a larger sample size than required by the test method. In addition, the sample size to be used was stipulated to also reduce the variability associated with using variable sample size. Unaccounted material losses or gains (lost material, binding, material break down etc) have a greater effect the smaller the sample size. There was sufficient material provided to allow retesting should the participant need to do so. Laboratories performance is based on the ‘% Passing’ results. Sample B – Moisture Content

Calculations were undertaken to ensure that an accurate moisture content was achieved across all samples prepared. The accuracy needed to be sufficiently small as to have only an insignificant influence on the testing performed by participants i.e. Less than 0.02%. The program was designed to provide technical feedback regarding performance as well as possible improvements in performance. Further considerations involving the design of the program are detailed below.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 34 of 47

Page 35: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

7.2.2 Selection of material used in the program

Sample A - PSD

A soil sample was selected for the PSD test (sample A) with a significant amount of material passing the 0.75 µm sieve. The material breaks down only slightly under test. The sample also had particles covering all sieve sizes requiring a reasonable level of skill to test. The sieving determination has been designed to allow accurate comparisons between laboratories to be made. The sample used contains sufficient material at each fraction size to produce a result suitable for comparative purposes. The number of significant places that results are required to be submitted has been increased to facilitate comparison. The test method allows for a moisture correction to be performed. For this program, it was desirable to focus as much as possible on the sieving outcome. Consequently, the material was dried prior to commencement by each participant to eliminate any variability due to moisture. The sieving standard does not cover material passing the 75 μm sieve as it is covered by the hydrometer test. It is however desirable to record this information. It allows “check sums” to be performed on the sieving analysis and as a measure as to how well the washing operation may have been performed. A sample was selected to ensure there was overloading of some sieves to simulate typical sieving operations and to fully cover the PSD process. The sample size was restricted to a set starting mass to reduce the variability associated with variable sample size. Unaccounted material losses or gains (lost material, binding, material break down etc.) have a greater effect the smaller the sample size. Sample B – Moisture Content

Moisture content is a common test performed by soil laboratories. Sand was used for the moisture content test to reduce variability in testing. Samples of accurately known moisture were provided to ensure that homogeneity would be satisfactory for the program. The samples were prepared so that the moisture contend would be 19.48 ± 0.02 %. Homogeneity samples were tested to ensure integrity of the samples sent and validate the integrity of the preparation process. 7.2.3 Role of proficiency testing

The determination of outliers is an important task of this proficiency program. A secondary function is to provide feedback that can help those with outliers identify possible areas to investigate as well as assist all participants to improve. In addition to the statistics, proficiency programs often obtain other information that is not normally available to a laboratory. It allows for a better understanding of the testing and can provide information that can lead to improvements in the testing process or test method.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 35 of 47

Page 36: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Proficiency testing enables participants to measure competency against others. It is also a measure of staff performance and the equipment used. Apart from ‘measurement uncertainty’ it is the most useful tool a laboratory has in better understanding the performance of a test. 7.2.4 Participant assessment

Assessment of each participant is based on a z-score that is related to the program consensus value (median). This is used to determine any statistical outliers. Compliance to proficiency program requirements including the correct calculation of results and adherence to program and test method requirements may also be used as part of the assessment process. Participants may also be asked to investigate any discrepancies detected with the paperwork submitted. See section 7.10 for more detail. 7.2.5 Reporting of results - Significant figures

The number of decimal places (significant figures) reported for a test has a bearing on the statistical analysis and therefore the interpretation of the results. There is a need to strike a balance between what is desirable from a statistical viewpoint while recognising how the results are used in practice. Too few decimal places (e.g. due to rounding) can cause an increase in the observed spread of results. Increasing the number of decimal places (with respect to normal reporting) can distort the observed spread of results compared to that encountered in actual practice. Large numbers of similar, rounded results can also cause a distortion in the analysis. For example, rounding to 0.5 % means that any number between 10.75 and 11.25 will be 11.0%. If the largest value is 10.75 in a set of results it is pushed out to 11.0 through rounding. Rounded results are useful from “an end user” perspective but are not as useful when considering laboratory performance. For this program, it was decided that the benefits of using additional decimal places would complement the aim of the proficiency program. Participants results were analysed as received regardless of whether there were ‘more or less’ significant figures than the number requested by the program. 7.2.6 Additional information requested

This program requested additional information as detailed in Appendix C not usually reported. The additional information is however consistent with the performance of the test and the records the test method requires laboratories to maintain. The additional information is used to interpret participant’s performance and assist with providing technical comment including feedback on outliers and possible participant improvement.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 36 of 47

Page 37: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

7.2.7 PSD data checks

A secondary function of proficiency testing programs is to provide feedback that can help those with outliers identify possible areas to investigate as well as assist all participants to improve. This information also helps with identifying any random or systematic errors associated with the test methodology. As observed in other proficiency programs ‘operator errors’ can often creep into the result calculation process. Assessment of participant’s data was incorporated into this program to ensure data was comparable. Every participant’s PSD results are recalculated. Any inconsistencies identified during this process do not need to be investigated (as do outliers) but are identified as possible feedback for participant improvement. 7.2.8 Role of % Retained

The sieving component of this proficiency program is based on ‘% Passing’ results as normally reported by laboratories. The ‘% Passing’ involves a cumulative calculation which can at times give rise to misleading outliers, particularly on smaller aperture sieves. In such cases an outlier may not necessarily be attributed to the sieve size on which the outlier occurred. Participants need to be aware of this should they need to undertake any investigation. To provide feedback ‘Mass Retained’ is normally requested for each participant (Appendix C). Increasing the number of significant numbers that results are reported also aids accurate analysis and feedback. The calculated ‘% Retained” results may be provided as an appendix to the report where relevant. It should be noted that if the mass retained results submitted are themselves not correct then this will most likely show as z-scores greater than 3 or less than -3. This may be the case even if no outlier was obtained for the ‘% Passing’ results. To perform a comparison there needs to be a ‘one for one’ test result i.e. a ‘Mass Retained / % Passing’ correspondence for the analysis to be statistically valid. That is the accuracy of the analysis is dependent on all of participants supplying accurate mass retained results. 7.3 Sample Preparation Sample A - PSD

Sample A consisted of approximately 1.7 kg of a sandy moist soil. Samples for the program were drawn and packaged from a single, well mixed, lot. Each sample was number consecutively and placed in a plastic bag and heat sealed. Ten samples were drawn evenly spaced throughout the lot for homogeneity testing. Each participant received randomly drawn samples from the remainder. A unique participation code was assigned to each participant sample.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 37 of 47

Page 38: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Sample B – Moisture Content

Sample B consisted of approximately 1 kg of a light coloured sandy soil. A single lot of bulk sample was oven dried and well mixed. A known weight of soil was added to a sample bag. A known amount of water was added to each sample. Bags were immediately heat sealed placed into a second bag and heat sealed again. Bags were consecutively numbered. Ten samples were drawn evenly spaced throughout the lot for homogeneity testing. Each participant received randomly drawn samples from the remainder. A unique participation code was assigned to each participant sample. Sample A and B were packed into a sturdy box prior to dispatch. 7.4 Packaging and Instructions Each sample was sealed in a plastic bag, labelled with the program name. Sample A and B were packed into a sturdy box. Participants were instructed to test according to the nominated test method and report to the accuracy indicated on the ‘results log’ sheet. See ‘Appendix A’ for a copy of the instructions issued to participants and ‘Appendix B’ for the log sheet used. A set of instructions and log sheet were placed in the box prior to sealing and despatch. 7.5 Quarantine Samples sent to Western Australia (WA) are subject to quarantine regulations that require treatment of the soil prior to importation into WA. Samples sent to WA are heat treated and compliance certificates enclosed with samples. Additional information regarding handling and preparation of the sample were included. 7.6 Sample Dispatch Samples were dispatched to participants in March 2019 using Toll Priority. Dispatched samples are tracked from despatch to delivery to each participant by LabSmart Services. 7.7 Homogeneity Testing Samples for homogeneity testing were packed in the same way as those for participants. Ten samples were selected at approximately equal intervals throughout the set of participant samples. The same instructions were given to the laboratory performing the homogeneity testing. Analysis of the homogeneity testing results indicated that the variability associated with the proficiency samples was satisfactory (Table 7.7A). The larger apertures did give greater variation then is normally obtained. The average value for each homogeneity test lies within or close to 1 s.d of the participant’s median value. The assessment of the homogeneity provides confidence that any outliers identified in the program represent statistically valid outliers.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 38 of 47

Page 39: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Sample Test Units

% Passing

Average s.d

Coefficient of

Variation

H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 (%)

A

Less than 75 μm by washing % 2.49 2.34 2.26 2.22 2.32 2.29 2.45 2.42 2.17 2.22 2.32 0.11 4.6

PSD

2.36 mm % 78.56 76.78 78.37 79.05 76.50 75.69 76.42 76.67 74.08 72.44 76.46 2.04 2.7

1.18 mm % 53.85 51.70 53.62 54.33 51.74 50.90 51.49 51.56 49.07 47.15 51.54 2.19 4.3

600 μm % 32.83 31.84 32.97 33.20 31.94 31.26 31.64 31.27 30.41 29.00 31.64 1.27 4.0

425 μm % 24.76 24.15 24.80 25.09 24.11 23.64 23.96 23.51 23.10 22.07 23.92 0.90 3.8

300 μm % 16.71 16.43 16.80 16.96 16.28 16.08 16.31 15.72 15.94 15.12 16.24 0.55 3.4

150 μm % 6.66 6.61 6.68 6.80 6.67 6.40 6.60 5.94 6.55 6.12 6.50 0.27 4.2

75 μm % 2.70 2.74 2.67 2.88 2.90 2.49 2.75 2.06 2.90 2.51 2.66 0.26 9.6

B Moisture Content % 18.65 18.59 18.59 18.65 18.64 18.69 18.65 18.62 18.73 18.62 18.64 0.04 0.2

Table 7.7A Homogeneity results for sample A & B

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 39 of 47

Page 40: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

7.8 Participation Thirty-three participants entered the program. The nominated date for participants to return their results was 2 April 2019. All participants were able to return their results in time for inclusion in the final report. 7.9 Statistics Z-Scores were calculated for each test and used to assess the variability of each participant relative to the consensus median. A corresponding z-score graph was produced for each test. The use of median and quartiles reduces the effect that outliers have on the statistics and other influences. Consequently, z-scores provide a more realistic or robust method of assessment. Some results were reported by participants to more decimal places than requested as part of the proficiency program and by others to fewer decimal places. In all instances test results have been used as submitted by participants. Assessment of participant’s data is undertaken to ensure results are statistically comparable. Checks are undertaken to ensure the results calculated matches that reported by the participant and that the appropriate corrections etc. have been applied if required. The level of checking required varies from program to program. If significant inconsistencies are identified the results may be removed (Rejected) or amended with the discrepancy highlighted.

A z-score is one way of measuring the degree of consensus with respect to the grouped test results. The z-scores in this report approximate standard deviations. For each test, a z-score graph is shown. Use the graph to visually check statistically how you compare to other participants. The following bar (Figure 7.9A) is shown at the bottom of each graph. This helps to quickly visualize where each participant’s result falls.

Review Weak

Consensus Strong Consensus

Weak Consensus

Review

Figure 7.9A Z-score interpretation bar

For example:

• A strong consensus (i.e. agreement) means that your test result is close i.e. within 1 standard deviation of the median.

• A weak consensus means that your test result is satisfactory and is within 2 standard deviations of the median.

• If you have obtained a test result that is outside 2 standard deviations, then it

may be worth reviewing your testing processes to ensure that all aspects are satisfactory. Only those obtaining a z-score approaching 3 (I.e. outside 2.75 range) have been highlighted in the report for review.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 40 of 47

Page 41: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

If you have obtained a test result that is outside 3 standard deviations then you will need to investigate your testing processes to ensure that all aspects are satisfactory. For further details on the statistics used in this proficiency program can be obtained from LabSmart Services or download the ‘Participant Guide’ from the LabSmart Services website. 7.9.1 Z-score summary

A “Z-Scores Summary” is issued soon after most results are received. It gives participants early feedback as to any program outliers. The summary is usually available on the LabSmart Services website up until the final report is issued. The final report supersedes the z-score summary. The final report contains detailed technical feedback regarding the performance of tests and revised z-scores. The inclusion of late results or corrections are at the discretion of the program coordinator. In some instances, this may change some of the z-scores slightly but generally the performance outcome remains the same. If there is any impact it will be discussed within section 7.1 of the report. 7.9.2 Comparing statistics from one program to another

The statistics generated from one proficiency program are not usually comparable to those from another proficiency testing program. Only very general comparisons may be possible. The reason statistics from one program may not be compared to another is due to the range of variables that differ from one proficiency program to another. These variables include:

• Type of material selected

• Variability of the sample

• The number of participants

• Experience of participants

• Test methodology variations

• Number of organisations represented

• Equipment used

• Range of test methods used

• Experience of supervisors

• Range of organisations involved

• Program design

• Type of statistics employed

The program outcome represents a ‘snap shot’ of the competency within the industry and hence provides an overview of the industry. The more participants involved in the program then the more representative the overview. 7.9.3 Measurement uncertainty

The statistics detailed in this program do not replace the need for laboratories to separately calculated measurement uncertainties associated with each test when required by the client or NATA. The proficiency program does give information useful for calculating the MU and bench marking the MU calculated.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 41 of 47

Page 42: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

7.9.4 Metrological traceability

The assigned median value used in this proficiency testing program is derived from participant performance and is not metrologically traceable. 7.10 Non-statistical Matters One of the issues faced by proficiency testing providers is what to do with an incorrect result even if its z-score is satisfactory. In many cases they cannot be detected but still can have a significant impact on the statistics calculated. This can cause biased (or unfair) outcomes for other participants. To limit the effect that erroneous results may have on a program additional information is requested to allow the main results to be recalculated. In some cases, results shown to be erroneous may be reject for inclusion in the program. If the result does not add any significant statistical bias it is left in the program. The result however is incorrect even though it may have a satisfactory z-score. To highlight that the participant needs to investigate erroneous results it is considered a ‘non-statistical’ matter. This may also be applied to non-compliance to program requirements e.g. incorrect reporting of results etc or incorrect partial calculations/data. Non-statistical matters were not used as part of the assessment process for this program.

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 42 of 47

Page 43: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

LabSmart Services

Soil Grading & Moisture Content Proficiency Testing Program – 2019 (86)

INSTRUCTIONS FOR TESTERS

1. Please check that the package you have received contains the following:

• Instructions (for testers)

• Results Log

• Sample A – PSD sample, approximately 1.7 kg

• Sample B – Moisture content sample, approximately 1 kg

Contact LabSmart Services if the bag is damaged or any item is missing. Phone 0432 767 706.

2. Please do not discuss aspects of this program with other organisations or other staff within your own organisation who may also be testing a sample from this program. Confidentiality is important to ensure statistically valid measures of participant performance.

3. Before testing please read and examine the results log sheet. Follow these

instructions carefully.

4. Use AS 1289.3.6.1 and AS 1289.2.1.1 test methods unless you are unable to do so. You may perform a test even if you are not NATA accredited for the test.

Sample A - PSD

5. Mix the contents of the bag marked ‘Sample A – PSD’. Ensure the whole sample is thoroughly mixed and breakup any clumps that may have formed during transit.

6. Screen the sub-sample using the 4.75mm sieve. Use only the material passing the

4.75mm.

7. Split to obtain a sub-sample of approximately 400g.

8. Dry the sub sample (of around 400g) as per the standard.

Testing

9. Record the mass obtained in step 8 above as the start mass for the PSD.

10. Wash the sample and dry as per AS1289.3.6.1. Record the washed dry mass.

11. Calculate the “% passing 75µm” using the mass recorded under step 9 and 10.

12. Perform the remaining grading and calculate the “% passing” using the start mass recorded under step 9.

13. Some sieves may become overloaded. If needed there are two columns on the log sheet to record the mass of each split portion.

14. It is recommended that the entire sample A following testing be retained until the technical report has been issued.

Instructions continued over page Page 1 of 2

PT Instructions V5 (86) Copyright LabSmart Services Pty Ltd

Appendix A

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 43 of 47

Page 44: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Sample B – Moisture Content

15. Do not open the bag marked ‘Sample B – Moisture Content’. 16. The moisture in the sample will be unevenly spread throughout the sample during

transit due to vibration, gravity and differences in temperature.

17. The sample should be kneaded while in the plastic bag to help spread the moisture. This needs to be performed several times a day for at least two days. Alternating how the bag is left on the bench to cure will also help promote an even spread of moisture. Curing at around 200 C will reduce condensation and promote even dispersion of the moisture.

18. The whole sample may be used or a subsample as per the test method AS 1289.2.1.1

to determine the moisture content. If whole sample is used, then no need to perform step 17.

19. Record the wet mass of the sample used to determine the moisture content. Make

sure it is the wet mass and not the wet mass plus container.

20. Determine the moisture content.

21. Record all information and calculations as per the proficiency testing results log sheet and to the accuracy shown on the results log sheet if possible. In many cases a greater reporting accuracy is required compared to that nominated by the standard.

22. Have a query? Contact Peter at LabSmart Services. Phone 0432 767 706.

23. Please fax or e-mail the “Results Log” to LabSmart Services by 2 April 2019

Fax: (03) 8888 4987 OR E-mail: [email protected]

24. Please retain the completed “Results Log” as this contains your participation code

that will identify your results in the technical report covering the proficiency testing program. It is also recommended that a copy of completed worksheets be kept with the results log in your proficiency file.

Thank you for participating in this proficiency testing program.

Page 2 of 2

PT Instructions V5 (86) Copyright LabSmart Services Pty Ltd

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 44 of 47

Page 45: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

LabSmart Services

Soil Grading & Moisture Proficiency Testing Program – 2019 (86)

RESULTS LOG Participation Code: xx Laboratory: xx

Please fax (03) 8888 4987 or E-mail ([email protected]) the completed results log by 2 April 2019

Date samples received:

Condition of Samples as received: A: B:

Sample A - PSD Report

to:

Results

Method

AS 1289

Tick or enter

method used

Start Mass (g) (Instructions, step 9)

Nearest

0.01

(Where possible)

Use this as your start mass

3.6.1

Dry Washed Mass (g) (Instructions, step 10)

“% passing 75 um” (Instructions, step 11)

Particle Size Distribution (Instructions, step 12) Mass Retained per sieve (g)

Instructions, step 13 %

Passing

2.36 mm

1.18 mm

600 µm

425 µm

300 µm

150 µm

75 µm

Pan

Diameter of sieves used:

Was a mechanical shaker used: If so for how long: mins

Balance LOP from calibration report:

Tested by:

Date Tested:

Sample B - Moisture Content Report

to:

Results

Method

AS 1289

Tick or enter

method used

Wet mass of sample (g) (Instructions, step 19) Nearest

0.01 (Where

possible)

2.1.1

Moisture content (%) (Instructions, step 20)

Balance LOP from calibration report:

Tested by:

Date Tested:

COMMENTS:…………………………………………..............………………………

------------------------------------ ---------------------------------- --------------- Supervisor Name (Please Print) Signature Date

In signing the above, I acknowledge that the above results have been approved and have been checked. I will also ensure that the results are kept confidential both internal and external to the laboratory until the issue of the final technical report covering this proficiency program.

Thank you for participating. Please retain this sheet for your records

PT Results Log V5 (86) Copyright LabSmart Services Pty Ltd

Appendix B

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 45 of 47

Page 46: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

Appendix C - Participant Results

CO

DE

Particle Size Distribution

Pan

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Reta

ined (

g)

Q9 409.3 398.4 2.7 102 75 98.81 51 80.28 31 35.16 23 28.59 16 37.76 7 13.94 3 0.6 200 mm

K5 398.48 385.96 3.14 87.5 78 99.84 53 77.9 33 36.4 24 28.54 17 39.64 7 14.88 3 1.25 200 mm

E3 476.3 465.4 2.3 118 75 119.7 50 92.6 31 37.5 23 35 15 44.9 6 17.6 2 0.9 200/300 mm

P8 394.54 383.8 2.72 106 73.15 98.14 48.27 69.96 30.54 31.27 22.62 28.14 15.48 35.15 6.57 14.86 2.81 0.3 200 mm

N6 805.7 785.8 2.5 208 74 46.06 50 35.45 32 16.8 23 13.58 16 18.55 6 6.95 3 0.45 200/300 mm

Q2 390.5 379.9 2.7 83.1 79 97.3 54 77.25 34 36.5 25 29.69 17 40 7 14.97 3 1.03 200 mm 10

W9 402.28 392.69 2.38 83.1 79.35 101.9 54.01 81.64 33.47 35.85 24.56 32.23 16.55 41.56 6.22 14.53 2.61 0.77 200 mm 10

M8 402.8 392.3 2.61 99.2 75.37 102.3 49.98 77.9 30.64 21 22.94 29.8 15.54 37.4 6.26 14.7 2.61 0 200 mm 15

R9 452.8 440.7 2.67 85.3 81.16 115 55.78 89.19 36.08 47.36 25.62 38.98 17.01 45.28 7.01 18.01 3.03 0.86 200 mm

G6 409.94 401.76 2 91.5 77.69 106.7 51.65 82.87 31.44 33.62 23.23 28.93 16.18 38.66 6.75 15.54 2.95 3.65 200 mm

A8 360.08 350.91 2.55 82.4 77.16 87.68 52.81 69.07 33.63 31.82 24.79 30.44 16.34 35.9 6.37 13.48 2.65 0.11 200/300 mm 12

T2 405.8 397.3 2.1 98.4 75.8 102.6 50.5 76.1 31.7 35.2 23 29.1 15.9 38.9 6.3 15.5 2.5 1.3 200 mm 10

J6 422.76 414.79 1.89 118 72.04 107.4 48.05 77.53 29.71 33.88 21.7 28.66 14.92 39.2 5.65 15.09 2.08 0.69 200/300 mm 10

G9 412.61 403.34 2.25 94.2 77.17 102.7 52.29 81.42 32.56 34.9 24.1 29.82 16.87 41.79 6.74 16.88 2.65 1.65 200/300 mm 7

P7 440.9 431.71 NR 96.3 78.15 112.2 52.7 90.17 32.25 41.48 22.84 33.38 15.27 41.72 5.81 15.59 2.27 0.61 200 mm

Q8 460.9 451.5 2 103 77.6 113.1 53 96.5 32.1 37.4 24 37.7 15.8 44.2 6.2 18.1 2.3 0.9 150 mm

P4 418.3 408.7 3 101 76 109.3 50 81.8 30 28.4 23 33.7 15 36.7 6 14.9 3 0.7 200 mm 15

C8 410.2 394.2 3 87.9 78 103.2 53 84.1 32 30.6 24 34.1 16 38.2 6 14.6 3 0.5 200 mm 10

B5 421.4 405.3 3 91.5 78 100.6 54 87 33 32.4 25 36.5 16 40.4 6 15.1 3 0.8 NR 10

K7 397.3 385.92 2.86 98 76.94 99.72 51.1 78.93 30.64 32.81 22.14 33.32 13.51 36.91 3.94 14.7 0.13 0.32 200 mm

J2 403.8 396.2 1.918 85.5 78.83 102.3 53.49 83.4 32.84 36 23.92 31.2 16.2 40.8 6.09 15.9 2.15 0.9 300 mm 8

B9 404.6 395.3 2.35 81.4 79.88 101.9 54.7 86.5 33.32 49.8 21.01 20 16.07 38.9 6.46 15 2.74 0.2 300 mm

F6 433 423.6 2.22 93.3 78.53 105.5 54.09 87.8 33.81 40.2 24.53 35.8 16.26 43.3 6.93 17.8 2.82 0.5 300 mm 8

X8 391.85 384.72 1.85 78.3 79.64 99.79 53.7 82.68 32.21 31.98 23.9 34.64 14.89 38.85 4.8 17.36 0.29 1.04 200 mm

L5 443.83 433.27 2 111 75 55.96 50 42.62 30 18.74 22 15.4 15 20 6 7.75 2 0.15 200/300 mm

E2 393.41 386.89 1.66 94.5 75.98 99 50.82 77.36 31.16 29.52 23.66 30.89 15.81 35.91 6.68 15.93 2.63 3.61 200 mm 15

G4 431.22 420.61 1.3 111 68.37 106.8 45.2 82.94 27.21 39.27 18.69 31.07 11.95 37.11 3.9 12.15 1.27 0.09 200 mm

300 um 150 um 75 mm

Sie

ve D

iam

ete

r

Shaker

Tim

e (

min

)

Note 1 : Blank entries indicate no result was supplied. Shaded entries indicate a result not supplied but calculated by the program coordinator from mass retained

values submitted. Particpants that used a mechanical shaker have the time used shown.

CO

DE

Sta

rt M

ass (

Dry

)

Dry

Washed M

ass

Washed %

P

assin

g

75 u

m

2.36 mm 1.18 mm 600 um 425 um

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 46 of 47

Page 47: PSD & Moisture Content - 2019 (86) PROFICIENCY TESTING ... LabS… · 2.1.1, Determination of the moisture content of a soil – Oven drying method. The program provides confidence

CO

DE

Particle Size Distribution

Pan

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Ma

ss r

eta

ined (

g)

% P

assin

g

Reta

ined (

g)

L7 409.5 399 2.56 93.5 76.6 100.1 52.1 76.2 33.5 40.7 23.6 30.2 16.2 40 6.4 14.6 2.9 0.9 200 mm

X2 443.9 434.9 2 95.9 78.4 105.9 52.3 87.9 32.5 40.5 23.4 31.8 16.2 42.7 6.6 17.2 2.7 NR 200 mm 10

U3 422 411.6 2.46 95.7 77 106.2 52 84.5 32 36.8 23 30.2 16 42.21 6 14.3 3 0.13 200 mm

V6 426.5 418.2 1.85 93.8 78.01 107.2 52.87 83.7 33.25 36.2 24.76 37.3 16.25 41.7 6.47 16.7 2.56 1.3 200 mm 12

K2 421.2 413.6 1.8 97.7 76.8 109.7 50.76 77 32.48 32.7 24.72 36.2 16.12 40.8 6.43 15.8 2.68 1.4 200/300 mm 12

Q7 435.2 427.3 NR 113 73.97 110.9 48.48 78.6 30.42 32.9 22.86 32.3 15.21 38.9 6.27 15.8 2.64 1.7 200/300 mm 12

150 um 75 mm

Sie

ve D

iam

ete

r

Shaker

Tim

e (

min

)

Note 1 : Blank entries indicate no result was supplied. Shaded entries indicate a result not supplied but calculated by the program coordinator from mass retained

values submitted. Particpants that used a mechanical shaker have the time used shown.

CO

DE

Sta

rt M

ass (

Dry

)

Dry

Washed M

ass

Washed %

P

assin

g

75 u

m

2.36 mm 1.18 mm 600 um 425 um 300 um

PSD & Moisture Content - Proficiency Testing Program - 2019 (86)

Copyright: LabSmart Services Pty Ltd Issued - May 2019 Page 47 of 47