EPA/821/F-98/005
SEPA
United States
Environmental Protection
Agency
Office of Water (4303)
Office of Solid Waste (5307W)
EPA-821-F-98-005
February 1999
Fact Sheet
Approval of EPA Methods 1664, Revision A, and
9071B for Determination of Oil and Grease and Non-
polar Material in EPA's Wastewater and Hazardous
Waste Programs
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Summary
EPA announces publication of a final rule approving use of EPA Methods 1664, Revision A, and
9071B for determination of oil and grease and non-polar material (NPM) in EPA's wastewater
program (40 CFR part 136) and hazardous waste program (40 CFR part 260). Approval of
these methods supports EPA's effort to protect Earth's ozone layer by reducing dependency on
use of chlorofluorocarbons (CFCs). Methods 1664 and 9071B employ n-hexane as the
extraction solvent in place of 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113), a Class 1 CFC.
Background
The U.S. Environmental Protection Agency
(EPA) publishes analytical testing methods that
are used by industrial and municipal facilities to
analyze chemical and biological components of
wastewater, drinking water, sediment, and other
environmental samples (for the purpose of data
gathering and compliance monitoring under the
Clean Water Act and the Safe Drinking Water
Act.)
EPA is approving Method 1664, Revision A,
for use under the Clean Water Act and as an
additional analytical method for the
determination of oil and grease and non-polar
material in aqueous matrices in EPA's
wastewater and hazardous waste programs.
EPA Method 1664, Revision A: N-Hexane
Extractable Material (HEM; Oil and Grease) and
Silica Gel Treated N-Hexane Extractable
Material (SGT-HEM; Non-polar Material) by
Extraction and Gravimetry\s being approved as
part of EPA's effort to reduce dependency on
use of chlorofluorocarbons (CFCs). EPA is also
approving Method 9071B for use in the
hazardous waste program for solid and semi-
solid materials.
Method 1664, Revision A
Method 1664, Revision A, is a liquid/liquid
extraction (LLE), gravimetric procedure that
employs normal hexane (n-hexane) as the
extraction solvent, in place of 1,1,2-trichloro-
1,2,2-trifluoroethane (CFC-113; Freon-113), a
Class 1 CFC, for determination of the
conventional pollutant oil and grease. Because
the nature and amount of material determined is
defined by the solvent and by the details of the
method used for extraction, oil and grease and
NPM are "method-defined analytes."
Method 1664, Revision A is capable of
measuring HEM and NPM in the range of 5 to
1000 mg/L, and may be extended to higher
levels by analysis of a smaller sample volume
collected separately. The method detection
limit (MDL) for HEM in Method 1664, Revision A
is 1.4 mg/L and the minimum level of
quantitation (ML) is 5.0 mg/L.
Method 1664, Revision A may be modified to
reduce interferences and take advantage of
advances in technology or to lower the costs of
measurements, provided that all method
equivalency and performance criteria are met.
This performance-based approach is consistent
with the Agency's streamlining proposal and the
Agency's performance-based measurement
system policy.
Improvements and Changes Included in
Revision A of Method 1664
Revision A to Method 1664 is based on
comments and analytical data received during
both comment periods for the proposed rule (61
FR 1730; January 23,1996 and 61 FR 26149;
May 24, 1996) and the comment period for the
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notice of data availability (62 FR 51621;
October 2, 1997). The significant improvements
include: (1) the term "total petroleum
hydrocarbons" (TPH) has been replaced by
"non-polar material" (NPM) to avoid confusion
with TPH measurements by other methods; (2)
the requirement for a matrix spike duplicate
(MSD) has been changed to a suggestion; (3)
the size of an analytical batch has been
increased to a maximum of 20 samples per
discharge or waste stream; and (4) use of solid-
phase extraction (SPE) has been allowed
without a demonstration of equivalency,
provided that the discharger/generator assumes
the risk associated with any disparity in results
from liquid-liquid extraction (LLE).
Timing of Required Use of Method 1664,
Revision A and Phaseout of Use of CFC-113
EPA proposed to withdraw the currently
approved methods six months after publication
of the final rule in the Federal Register in an
effort to provide for use and depletion of
existing laboratory stocks of CFC-113. EPA has
decided not to withdraw the CFC-113 based on
EPA's and commenters' concerns about
potentially differing results using the new
method that could bring a permittee into
noncompliance under certain circumstances.
However, EPA believes that direct replacement
of the new method is warranted in most cases.
Therefore, EPA strongly encourages
dischargers/permittees to use Method 1664
rather than the CFC-113 methods for existing
permits. EPA also recommends the use of the
new method for all new permits and reissued
permits.
Method 9071B
EPA is also approving the use of Method
9071B for use in EPA's hazardous waste
program. This method is for solid and semi-
solid materials. Method 9071B also uses n-
hexane instead of CFC-113 as the extraction
solvent. This method is not required by any
hazardous waste program regulation but it can
be included as part of a hazardous waste
delisting demonstration.
Additional Information and Copies
For further information concerning the final
rule approving use of Method 1664, Revision A,
please contact Dr. Maria Gomez-Taylor, in
EPA's Office of Water (4303), USEPA Office of
Science and Technology, 401 M Street, SW,
Washington, DC 20460, (Phone: 202-260-
1639); E-mail: gomez-taylor.maria@epa.gov).
For information regarding the use of Method
1664, Revision A in the Office of Solid Waste,
contact Gail Hansen, in EPA's Office of Solid
Waste (5307W), USEPA, 401 M Street, SW,
Washington, DC 20460, (703-308-8855; E-mail:
hansen.gail@epamail.epa.gov).
The final rule published in the Federal
Register contains instructions on how to obtain
additional information and how to review the
public record for this rulemaking.
The complete text of the Federal Register
notice containing this final rule may be
accessed through the Internet and the
Superintendent of Documents homepage at
http://www.access.gpo.gov/su_docs/. The full
text of EPA Method 1664, Revision A may be
viewed or downloaded from the Internet at
http://www.epa.gov/OST/Methods.
You may also obtain copies of Method 1664,
Revision A through the U.S. EPA National
Service Center for Environmental Publications
(NSCEP), 11029 Kenwood Road, Cincinnati,
OH 45242, telephone: (800) 490-9198, Internet:
http://www.epa.gov/ncepi. Method 1664,
Revision A will also be made available at the
National Technical Information Service (NTIS),
5285 Port Royal Road, Springfield, VA 22161,
(703) 605-6000 or (800) 553-6847. The NTIS
number is PB99-121949.
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