What the 2015
Methods Update Rule
Means to You
Presented by Wendy Schultz
Ann Arbor Environmental Services Laboratory
[email protected]
1
Compliance sample testing?
EPA updates the list of
approved methods used for
compliance testing.
3
EPA updates the list of
approved methods used for
compliance testing.
Methods
Update Rule
4
5
Code of Federal
Regulations
(CFR)
6
Code of Federal
Regulations
(CFR)
Title 40 – Protection of Environment
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Safe Drinking Water
Act (SDWA)
40 CFR Part 141
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Clean Water Act
(CWA)
40 CFR Part 136
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2015 Methods Update Rule
EPA
proposed
changes
Feb. 2015
2015
2016
2017
10
2015 Methods Update Rule
EPA
proposed
changes
Comments
closed
Feb. 2015
May 2015
2015
2016
2017
11
2015 Methods Update Rule
EPA
proposed
changes
Comments
closed
Feb. 2015
May 2015
EPA reviewed comments
2015
2016
2017
12
2016 Methods Update Rule
EPA
proposed
changes
Comments
closed
Signed
Final rule
Feb. 2015
May 2015
Dec. 2016
EPA reviewed comments
2015
2016
2017
13
2017? Methods Update Rule
EPA
proposed
changes
Comments
closed
Signed
Final rule
Final rule withdrawn
Jan. 2017
Feb. 2015
May 2015
Dec. 2016
EPA reviewed comments
2015
2016
2017
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Wait, What?
Will it apply to me?
Clean Water Act
(40 CFR Part 136)
18
Drinking Water
Methods that:
•
Reference to 40 CFR
Part 136
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What are the changes?
New and Revised Methods
EPA
ASTM
New
Revised
X
X
Std.
Methods
X
X
USGS
X
22
Approved
Alternate Test Procedures (ATP)
Idexx Colilert-18 with Quanti-tray for Fecal
23
Clarified the ATP procedures.
Corrections to
40 CFR Part 136
25
Changes to required containers,
preservation techniques and
holding times.
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New Method
Detection Limit
(MDL) procedure
40 CFR Part 136
Appendix B
27
MDL Sample Comparison
Current MDL
Revised MDL
Spikes
7/year
2/quarter*
Blanks
0
Use routine method
blanks
*less required if analysis is run infrequently
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MDL Definition Change
Current MDL
Revised MDL
99% confidence that
the measured
concentration is
greater than zero.
99% confidence that
the measured
concentration is greater
than blank.
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Day 1
Day 2
Day 3
blanks
spikes
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MDL Calculation
MDLspike = tSspike
MDLblank = X+tSblank
MDL = whichever is greater
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Ongoing Data Collection
Quarterly
Annually
Spikes
2/quarter
Blanks
Use routine
method blanks
Recalculate MDL
using ongoing
data
32
Look at
the annual
data
Ongoing
Data
Collection
Compare annual data to the existing MDL
• If within a factor of 2 – your choice to update
• If outside a factor of 2 – you must update MDL
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MDL Not Applicable to:
•
•
•
•
•
BOD
Color
pH
WET testing
others
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MDL can be
determined for TSS
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What next?
Start
gathering data
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Use data from
multiple
analysts.
*not real analysts
Use data from
multiple
instruments*.
*not for SDWA
Summary
Contact
Wendy Schultz
Ann Arbor Environmental Services
Laboratory
[email protected]
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