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Representative Subsampling at the Laboratory: New Guidance From USEPA Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 Jeffrey C. Myers August 18, 2004

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RepresentativeSubsampling at theLaboratory:New Guidance From USEPA

Jeffrey C. MyersAugust 18, 2004Jeffrey C. MyersAugust 18, 2004

Page 3: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

John Wiley & Sons 1997

Page 4: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

THE SEVEN “DEADLY” SAMPLING ERRORS

FUNDAMENTALERROR

INCREMENTEXTRACTIONERROR EE

PREPARATIONERROR PE

INCREMENTDELIMITATION

ERROR DE

GROUPING &SEGREGATION

ERROR GE

LONG-RANGEFLUCTUATION

ERROR CE2

PERIODICFLUCTUATION

ERROR CE3

Page 5: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

John Wiley & Sons 1997

Page 6: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

COMPOSITIONAL CH

DISTRIBUTIONAL DH

FORMS OF HETEROGENEITYFORMS OF HETEROGENEITY

Page 7: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

ZERO DIMENSIONAL LOTZERO DIMENSIONAL LOTZERO DIMENSIONAL LOT

DEFINITIONOF CH

DEFINITIONOF DH

Page 8: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

THE TRIAD APPROACH FROM EPA

Page 9: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

Uncertainties add as vectors (aUncertainties add as vectors (a22 + b + b22 = c = c22))

3 X3 X

Total Uncertainty AnalyticalUncertainty

Sampling Uncertainty

CC1/3 X1/3 X

AACCBB

Page 10: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

Sampling = 95%

Analytical = 5%Analytical = 5%

39,800 On-site41,400 Lab

500 On-site416 Lab

164 On-site136 Lab

27,800 On-site42,800 Lab

24,400 On-site27,700 Lab

1,280 On-site1,220 Lab

6 3

331 On-site 286 Lab

Page 11: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

Page 12: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

John Wiley & Sons 1997

Page 13: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

John Wiley & Sons 1997

Page 14: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

John Wiley & Sons 1997

Page 15: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

MASSDFE ))(5.22( 3

2 =

� FE = FUNDAMENTAL ERROR� D = DIAMETER OF LARGEST

PARTICLE� MASS = MASS OF ANALYZED PORTION

Page 16: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

SAMPLE MASS APPROX. ERROR 1 gm 40% 2 gm 30% 5 gm 20% 10 gm 15% 20 gm 10% PARTICLE SIZE = 2mm

RELATIVE FUNDAMENTAL ERROR: PARTICLESIZE REPRESENTATION

(RAMSEY 1990)

RELATIVE FUNDAMENTAL ERROR: PARTICLESIZE REPRESENTATION

(RAMSEY 1990)

Page 17: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

John Wiley &

Sons 1997

Page 18: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

Page 19: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

� CONING & QUARTERING� ALTERNATE SHOVELING� FRACTIONAL SHOVELING� RIFFLE SPLITTERS

� CHUTE� ROTARY

� CONING & QUARTERING� ALTERNATE SHOVELING� FRACTIONAL SHOVELING� RIFFLE SPLITTERS

� CHUTE� ROTARY

SUBSAMPLING METHODSSUBSAMPLING METHODSSUBSAMPLING METHODS

Page 20: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

CONING&

QUARTERING

CONING&

QUARTERING

Page 21: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

RIFFLE SPLITTERSRIFFLE SPLITTERS

Page 22: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

CORRECT ANDINCORRECTSAMPLINGDEVICES

Page 23: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

SCOOPSCOOP

Page 24: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

SPATULASPATULA

Page 25: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

JAPANESESLABCAKE

Page 26: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

CORRECT DELIMITATION WITH JAPANESE SLAB CAKES

Page 27: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

Page 28: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

SUMMARY

- PIERRE GY’S SAMPLING THEORY- EPA/600/R-03/027- http://cluin.org/publications/db/db_search.cgi?new=1&title=1&submit_search=1

Page 29: Representative Subsampling at the Laboratory...Representative Subsampling at the Laboratory: New Guidance From USEPA Jeffrey C. Myers August 18, 2004 2 3 John Wiley & Sons 1997 4 THE

Jeff MyersWashington Safety Management Solutions

[email protected]://www.gemdqos.com

APPENDIX F LABORATORY SUBSAMPLING - US EPAFrench geologist Pierre Gy has developed a theory of particulate sampling for applications in mining exploration and development (Gy, 1992),

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