[Federal Register Volume 59, Number 126 (Friday, July 1, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-16076]


[[Page Unknown]]

[Federal Register: July 1, 1994]


_______________________________________________________________________

Part XII





Environmental Protection Agency





_______________________________________________________________________



40 CFR Parts 141 and 142



Drinking Water; National Primary Drinking Water, Synthetic Organic 
Chemicals and Inorganic Chemicals; National Primary Drinking Water 
Implementation; Monitoring for Unregulated Contaminants; Final Rule
ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 141 and 142

[FRL-4838-6]

 

Drinking Water; National Primary Drinking Water Regulations--
Synthetic Organic Chemicals and Inorganic Chemicals; National Primary 
Drinking Water Regulations Implementation; Monitoring for Unregulated 
Contaminants

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule; technical amendments.

-----------------------------------------------------------------------

SUMMARY: In this document, EPA is amending the National Primary 
Drinking Water Regulations to correct typographical errors, clarify 
language which was unclear, and correct mistakes where the preamble 
correctly indicated the Agency's intent but the language of the 
regulation was in error. These changes are intended to simplify 
implementation of the regulations by reducing confusion about Agency 
requirements.

EFFECTIVE DATE: These amendments are effective July 1, 1994.

FOR FURTHER INFORMATION CONTACT: Richard Reding, Technical Support 
Division, Office of Ground Water and Drinking Water, Environmental 
Protection Agency, Cincinnati, Ohio 45268, (513) 569-7946.

SUPPLEMENTARY INFORMATION: In 1987, EPA promulgated National Primary 
Drinking Water Regulations for eight contaminants (Phase I). In 1991, 
EPA promulgated National Primary Drinking Water Regulations for 38 
contaminants (Phase II). In 1992, EPA promulgated National Primary 
Drinking Water Regulations for 23 contaminants (Phase V). The 
regulations contained errors which are corrected by this document. This 
document also clarifies the intent of the regulatory requirements in 
cases where the language was confusing or contradictory with the 
preamble.
    The Administrative Procedure Act, 5 U.S.C. 553, provides that when 
an Agency finds good cause, it may issue a rule without first providing 
notice and comment and make the rule immediately effective. This 
document corrects errors and omissions in 40 CFR 141 and 142. These 
revisions are so minor that the Agency finds that neither comment nor a 
delayed effective date is necessary or in the public interest. 
Accordingly, EPA finds that there is good cause not to solicit comment 
on this document and to have the revisions immediately effective.

Corrections to the Regulation

    This document corrects errors in the regulatory language. These 
corrections are described below.
    This document corrects the definition of ``Initial compliance 
period'' in Sec. 141.2 by inserting the ``Sec. '' before 141.61 and 
141.62 which was mistakenly omitted. This document also corrects 
141.62(b) (11)-(16) to (11)-(15), as the table only lists 15 
contaminants.
    Secs. 141.23(d), (d)(4), (e), and (e)(3) and Sec. 141.62(b) 
establish monitoring frequencies for transient non-community water 
systems (TWSs) for nitrate and nitrite. A definition for transient non-
community water system was not included in the promulgation of the 
final rule. This document amends Sec. 141.2 to include a definition of 
a transient non-community water system.
    This document adds the effective dates for the regulations 
promulgated July 17, 1992, and the regulations contained in Subpart I--
Control of Lead and Copper, to Sec. 141.6, the general section on 
effective dates for part 141.
    This document corrects a reference in Sec. 141.6(h) from 
Sec. 141(f)(16) to Sec. 141.24(f)(16).
    This document corrects errors in Sec. 141.23(a)(1) and (2) by 
revising Sec. 141.23(a)(1) and (2) and Sec. 141.23(c)(1) by replacing 
the starting dates with the term ``initial compliance period.'' The 
January 1, 1993 starting date listed in the current regulations will 
not be valid for future regulations. The ``three year cycle'' in the 
current regulations in Sec. 141.23(c) predates the Standardized 
Monitoring Framework compliance cycle and needs to be explicitly 
consistent with it.
    This document adds the Phase V inorganic contaminants (antimony, 
beryllium, cyanide, nickel and thallium) to paragraphs 
Sec. 141.23(a)(5), Sec. 141.23(f)(1) and Sec. 141.23(i)(2), which refer 
to monitoring requirements. The Phase V Federal Register Notice, 
specifically 57 FR 31819, indicates that the monitoring requirements 
for these contaminants conform to those already listed for the 
inorganic contaminants in these paragraphs, and that the intention was 
to add them to these paragraphs. These additions were inadvertently 
omitted.
    This document puts the method title ``Atomic Absorption; Platform'' 
in the table in Sec. 141.23(a)(4)(i) to be consistent with the way 
Table 11 appeared on page 31798 of the preamble to the final Phase V 
rule (July 17, 1992). It also deletes footnote 1 which referred to 
Appendix A of EPA Method 200.7 since the appendix has been incorporated 
in the text of the method; this change is also consistent with how 
Table 11 appeared in the preamble.
    This document clarifies that States may grant a monitoring waiver 
for cyanide if the State determines the system is not vulnerable by 
virtue of no proximity to an industrial source of cyanide. The preamble 
to the final rule said this clarification was contained in the final 
rule but it was omitted.
    This document corrects a typographical error in 
Sec. 141.23(c)(5)(iii). This document clarifies a statement in 
Sec. 141.23(i) (1) and (2) that compliance for each contaminant is 
determined separately.
    This document corrects a typographical error in Sec. 141.23(i)(1) 
by changing the term ``our'' to ``out.''
    This document eliminates the paragraph numbered Sec. 141.23(k)(1), 
replaces it with the paragraph currently numbered Sec. 141.23(k)(4), 
and then renumbers the remaining paragraphs. It also corrects a 
typographical error in a table heading in the new Sec. 141.23(k)(1) and 
a typographical error in the method applicable to antimony (``Method 
220.9'' should be ``Method 200.9'').
    The document corrects misspelled words in Sec. 141.23 (q)(3) and 
(q)(4), which should both read ``Coupled'', not ``Coupledd'' or 
``Couple''.
    This document deletes sections describing sampling and analytical 
requirements (Sec. 141.24 (a) through (e)), which refer to endrin. 
Phase V amended the existing regulations for endrin by deleting the MCL 
for endrin from Sec. 141.12 and adding the MCL to Sec. 141.61(c), and 
by including sampling and analytical requirements for endrin in 
Sec. 141.24(h). These requirements were immediately effective (August 
17, 1992). Accordingly, it is clear that the provisions of 141.24 (a) 
through (e) were superfluous; they were unintentionally retained and 
are now deleted.
    This document corrects a typographical error in the designation of 
``21'' to ``(21)'' in Sec. 141.24(f)(4).
    This document corrects references to ``approved laboratories'' 
which should refer to ``certified laboratories'' in several sections.
    This document corrects Sec. 141.24(f)(7) and Sec. 141.24(f)(10) by 
inserting the term ``non-community'' which was mistakenly omitted after 
the term ``non-transient''. NTNCWS is a defined term in the regulations 
(Sec. 141.2); ``non-transient'' is not a term used in NPDWRs.
    This document corrects an omission in Sec. 141.24 (f)(14)(i) and 
(h)(10)(i) by specifying the follow-up procedures to be taken when 
composite samples exceed the specified level. The paragraph currently 
states that, if the results of the composite sample are above specified 
levels, a follow-up sample from each of the composite sites must be 
taken within 14 days. The paragraph then needs to state that the 
follow-up samples need to be analyzed for the contaminants which were 
above specified levels. The correct follow-up language appears in 
Sec. 141.23(a)(4)(i) for inorganic contaminants but was inadvertently 
omitted in Sec. 141.24 on organic contaminants.
    This document corrects Sec. 141.24 (f)(14)(iii) by replacing the 
text with text consistent with Sec. 141.24(h)(10)(iii), which was the 
original intent of the regulations, as discussed on page 31826, column 
2 line 1 of the FR, July 17, 1992.
    This document completes the citation of a manual in 
Sec. 141.24(f)(16) by adding the date of publication of the manual. It 
also updates the toll-free telephone number cited in the paragraph.
    This document deletes Sec. 141.24(g). These paragraphs are from the 
Phase I rule (1987) and refer to the original eight volatile organic 
chemicals (VOCs). The preamble from the Phase II rule (1991) states our 
intention was to have identical monitoring requirements for all 18 
VOCs, as discussed on page 3561, column 2, paragraph c. of the FR, 
January 30, 1991. The paragraphs in Sec. 141.24(g) were replaced and 
superseded by those in Sec. 141.24(f), but were inadvertently left in 
the text and are now deleted.
    This document clarifies the intent of Sec. 141.24(h)(4) to specify 
that monitoring begins in the ``Initial compliance period.'' Currently, 
the regulations specify January 1, 1993, a date which will not be valid 
for the next set of regulations.
    This document reinserts subparagraphs Sec. 141.24(h)(10)(i), (ii), 
and (iii) which were inadvertently deleted by the Phase V FR, July 17, 
1992, which did not state that only the introductory text was to be 
replaced.
    This document corrects an omission in Sec. 141.24(h)(12) to add the 
citation to the July 1990 methods manual, which contains the methods 
promulgated new with Phase V: Methods 547, 548, 549, 550, and 550.1. 
This document also adds a new subparagraph in Sec. 141.24(h)(12) to 
cite Method 506 which was discussed in the preamble but omitted from 
the rule.
    This document corrects Sec. 141.32(e)(62) by replacing the number 
``0.004'' with the correct value of ``0.006'', the maximum contaminant 
level as established by Sec. 141.61(c).
    This document corrects several typographical errors in 
Sec. 141.32(e) (30), (33), (35) and (41).
    This document corrects the title of Sec. 141.40 to read 
``contaminants'' rather than ``chemicals''.
    This document makes corrections to Sec. 141.40(e) as 
``Chlorobenzene'' is currently regulated as ``Monochlorobenzene'', and 
``Dibromomethane'' was mistakenly omitted.
    This document corrects an error in Sec. 141.40(g) to cite the 
correct version of the methods manual. By deleting the specific 
reference to the manual in this paragraph, and referring instead to 
Sec. 141.24(f)(16) where the manual is also listed, EPA reduces the 
chance in the future that the reference will be updated in one 
paragraph but not the other. The telephone number at the end of the 
paragraph is also updated.
    This document replaces references which have been superseded by 
Phase II and Phase V and which should have been revised.
    This document deletes 1,2,4-Trichlorobenzene from the list of 
unregulated contaminants in Sec. 141.40(j). This contaminant became a 
regulated contaminant in regulations promulgated on July 17, 1992 (57 
FR 31776) and, therefore, no longer is an unregulated contaminant. 
Other contaminants which had previously been listed in Sec. 141.40(j) 
were deleted in the July 17, 1992, regulation but 1,2,4-
Trichlorobenzene was overlooked.
    This document corrects several typographical errors in the ``List 
of Unregulated Organic Contaminants:'' in Sec. 141.40(n)(11) and adds a 
reference to where the manuals containing the methods can be found.
    This document corrects the effective date of the regulation of 
endrin discussed in Sec. 141.60(a)(3) to be consistent with the date 
shown in the effective date section at the beginning of the regulation.
    This document corrects the table in Sec.  141.61(b), which lists 
best available technology for the organic contaminants. The changes 
made to Table Sec.  141.61(b) in 57 FR 31846 of July 17, 1992 should 
have specified by asterisks that the new table was to be added to the 
existing table, and was not to supersede it. The asterisks were 
inadvertently omitted, and consequently the rest of the table is 
presented as ``superseded text'' in the CFR 40 1993 Edition. This 
document merges the two tables and includes all the contaminants in 
both tables and the ``OX'' column. The word ``synthetic'' is removed, 
since the merged table will include contaminants referred to as 
``VOCs'' (volatile organic contaminants) as well as ``SOCs'' (synthetic 
organic contaminants).
    This document corrects the best available technology listing for 
toxaphene and toluene in Sec. 141.61(b) to make them consistent with 
the listing in Sec. 142.62(a). It also corrects a typographical error 
in the CAS number for glyphosate.
    This document corrects the MCL for aldicarb sulfone listed in 
Sec. 141.61(c).
    This document corrects a typographical error in the spelling of 
``ultraviolet'' in Sec. 141.62(c).
    This document corrects the best available technology listing for 
alachlor and hexachlorobenzene in Sec. 142.62 to be consistent with the 
technology listed for these two contaminants in Sec. 141.61, and 
corrects the spelling of ``dalapon.''
    This document corrects typographical errors in the table headings 
identifying best available technologies for achieving compliance with 
the maximum contaminant levels for organic chemicals. Packed Tower 
Aeration was incorrectly abbreviated as ``PAT'' and Granular Activated 
Carbon was incorrectly abbreviated as ``GAO'' in Sec. 142.62(a).
    This document corrects a typographical error in the ``Key to BATS 
in Table'' in the table entitled ``BAT for Inorganic Compounds Listed 
in Section 141.62(B)'' in Sec. 141.62(c). The table title currently has 
a superscript ``6'' rather than the word ``Section.''

Economic Analysis

    Under Executive Order 12866 (58 FR 51735 (October 4, 1993)), the 
Agency must determine whether the regulatory action is ``significant'' 
and therefore subject to OMB review and the requirements of the 
Executive Order. The Order defines ``significant regulatory action'' as 
one that is likely to result in a rule that may:
    (a) Have an annual effect on the economy of $100 million or more or 
adversely affect in a material way the economy, a sector of the 
economy, productivity, competition, jobs, the environment, public 
health or safety, or State, local, or tribal governments or 
communities;
    (b) Create a serious inconsistency or otherwise interfere with an 
action taken or planned by another agency;
    (c) Materially alter the budgetary impact on entitlements, grants, 
user fees, or loan programs or the rights and obligations of recipients 
thereof; or
    (d) Raise novel legal or policy issues arising out of legal 
mandates, the President's priorities, or the principles set forth in 
the Executive Order.
    Because this rule makes only technical corrections to previous 
rules, it is not a ``significant regulatory action'' under the terms of 
Executive Order 12866 and is, therefore, not subject to OMB review.

Other Requirements

A. Regulatory Flexibility Analysis

    The Regulatory Flexibility Act requires EPA to consider the effect 
of regulations on small entities (5 U.S.C. 602 et seq.). If there is a 
significant economic effect on a substantial number of small entities, 
the Agency must prepare a Regulatory Flexibility Analysis (RFA) 
describing alternatives that would minimize the impact. The impact of 
the requirements corrected and clarified in this rule was assessed at 
the time the requirements were imposed. Thus, there is no additional 
impact imposed by these regulations, and a Regulatory Flexibility 
Analysis is not required.

 B. Paperwork Reduction Act

    The information collection requirements contained in the Phase I, 
II, and V rules were approved by OMB under the Paperwork Reduction Act 
(44 U.S.C. 3501 et seq.) at the time the rules were promulgated. No 
additional requirements are imposed by these technical amendments.

 C. Federalism Review

    Executive Order 12612 requires all Federal agencies to consider 
legislative and regulatory proposals and other major policy actions to 
determine if they have substantial effects on federalism goals and 
principles as set forth in the Executive Order. According to EPA's 
Guideline for Implementing Executive Order 12612: Federalism, ``[i]f an 
EPA action is mandated or the necessary means to carry it out are 
implied by statute, then no further federalism assessment is 
required.'' The regulations which are being corrected by today's rule 
were required by statute. Thus, no federalism assessment was required 
to support the original rules or these technical amendments.

List of Subjects in 40 CFR Parts 141 and 142

    Environmental protection, Administrative practice and procedure, 
Chemicals, Reporting and recordkeeping requirements, Water supply.

    Dated: June 21, 1994.
Robert Perciasepe,
Assistant Administrator for Water.

    Parts 141 and 142 of Chapter I of Title 40 of the Code of Federal 
Regulations are amended as follows:

PART 141--[AMENDED]

    1. The authority citation for part 141 continues to read as 
follows:

    Authority: 42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 300g-
5, 300g-6, 300j-4, and 300j-9.


Sec. 141.2  [Amended]

    2. In Sec. 141.2, in the definition of Initial compliance period, 
before ``141.61'' and ``141.62,'' add ``Sec. ''. Also, change the 
designation ``Sec. 141.62(b) (11)-(16)'' to ``Sec. 141.62(b) (11)-
(15)''.
    3. Sec. 141.2 is amended by adding, in alphabetical order, a 
definition for ``Transient non-community water system'' to read as 
follows:


 Sec. 141.2  Definitions.

* * * * *
    Transient non-community water system or TWS means a non-community 
water system that does not regularly serve at least 25 of the same 
persons over six months per year.
* * * * *


Sec. 141.6   [Amended]

    4. In Sec. 141.6, revise paragraph (a) to read as follows:


 Sec. 141.6   Effective dates.

    (a) Except as provided in paragraphs (a) through (h) of this 
section, and in Sec. 141.80(a)(2), the regulations set forth in this 
part shall take effect on June 24, 1977.
* * * * *
    5. In Sec. 141.6(h), revise the reference ``Sec. 141(f)(16)'' to 
read ``Sec. 141.24(f)(16)''.


Sec. 141.23   [Amended]

    6. In Sec. 141.23 revise paragraphs (a)(1), (a)(2) including the 
note, and (a)(5) to read as follows:


 Sec. 141.23   Inorganic chemical sampling and analytical requirements.

* * * * *
    (a) * * *
    (1) Groundwater systems shall take a minimum of one sample at every 
entry point to the distribution system which is representative of each 
well after treatment (hereafter called a sampling point) beginning in 
the initial compliance period. The system shall take each sample at the 
same sampling point unless conditions make another sampling point more 
representative of each source or treatment plant.
    (2) Surface water systems shall take a minimum of one sample at 
every entry point to the distribution system after any application of 
treatment or in the distribution system at a point which is 
representative of each source after treatment (hereafter called a 
sampling point) beginning in the initial compliance period. The system 
shall take each sample at the same sampling point unless conditions 
make another sampling point more representative of each source or 
treatment plant.

    Note: For purposes of this paragraph, surface water systems 
include systems with a combination of surface and ground sources.
* * * * *
    (5) The frequency of monitoring for asbestos shall be in accordance 
with paragraph (b) of this section: the frequency of monitoring for 
antimony, barium, beryllium, cadmium, chromium, cyanide, fluoride, 
mercury, nickel, selenium and thallium shall be in accordance with 
paragraph (c) of this section; the frequency of monitoring for nitrate 
shall be in accordance with paragraph (d) of this section; and the 
frequency of monitoring for nitrite shall be in accordance with 
paragraph (e) of this section.
* * * * *
    7. In the table in Sec. 141.23(a)(4)(i), add immediately below 
``Atomic Absorption; Furnace'' in the third column for ``Antimony'' 
``Nickel'' and ``Thallium'' the words ``Atomic Absorption; Platform''; 
in the third column for ``Beryllium'' remove ``xl'' and add the words 
``Atomic Absorption; Platform''; remove footnote 1; and redesignate 
footnotes 2 through 6 as footnotes 1 through 5.
    8. In Sec. 141.23(c)(1), delete the phrase ``once every three 
years'' and substitute ``during each compliance period''.
    9. In Sec. 141.23, add a sentence to the end of paragraph (c)(2) to 
read as follows:
* * * * *
    (c)* * *
    (2) * * * States may grant a public water system a waiver for 
monitoring of cyanide, provided that the State determines that the 
system is not vulnerable due to lack of any industrial source of 
cyanide.
* * * * *
    10. In Sec. 141.23(c)(5)(iii), revise the word ``prcoedures'' to 
read ``procedures''.
    11. In Sec. 141.23, revise paragraph (f)(1) to read as follows:
* * * * *
    (f) * * *
    (1) Where the results of sampling for asbestos, antimony, barium, 
beryllium, cadmium, chromium, cyanide, fluoride, mercury, nickel, 
selenium or thallium indicate an exceedance of the maximum contaminant 
level, the State may require that one additional sample be collected as 
soon as possible after the initial sample was taken (but not to exceed 
two weeks) at the same sampling point.
* * * * *
    12. In Sec. 141.23(i)(1), in the first sentence revise the phrase 
``and thallium'' to read ``or thallium'' and, in the second sentence 
revise the word ``our'' to read ``out''.
    13. In Sec. 141.23(i)(2), revise the first sentence to read:
    (i) * * *
    (2) For systems which are monitoring annually, or less frequently, 
the system is out of compliance with the maximum contaminant levels for 
asbestos, antimony, barium, beryllium, cadmium, chromium, cyanide, 
fluoride, mercury, nickel, selenium or thallium if the level of a 
contaminant at any sampling point is greater than the MCL. * * *
* * * * *
    14. Sec. 141.23 is amended by removing paragraph (k)(1) and 
redesignating paragraph (k)(4) as paragraph (k)(1), paragraph (k)(5) as 
paragraph (k)(4), and paragraph (k)(6) as paragraph (k)(5).
    15. In the table headings in newly designated Sec. 141.23(k)(1), in 
the second column, revise the word ``Methodogy'' to read 
``Methodology''. In the table, in the third column, for Antimony, 
Atomic Absorption; Platform revise ``220.9'' to read ``200.9''.
    16. In Sec. 141.23(q)(3), remove the second ``d'' at the end of the 
word ``Coupledd''. In Sec. 141.23(q)(4), add a ``d'' to the end of the 
word ``Couple''.


Sec. 141.24   [Amended]

    17. In Sec. 141.24, remove and reserve paragraphs (a) through (e).
    18. In Sec. 141.24(f)(4), revise the number ``21'' to read 
``(21)''.
    19. In Sec. 141.24(f)(7) and (f)(10), in the first sentence after 
the word ``non-transient'', add ``non-community''.
    20. In Sec. 141.24(f)(20), revise the reference to ``approved 
laboratory'' to read ``certified laboratory''.
    21. In Sec. 141.24, revise paragraphs (f)(14)(i) and (f)(14)(iii) 
to read as follows:
* * * * *
    (f) * * *
    (14) * * *
    (i) If the concentration in the composite sample is greater than or 
equal to 0.0005 mg/l for any contaminant listed in Sec. 141.61(a), then 
a follow-up sample must be taken within 14 days at each sampling point 
included in the composite, and be analyzed for that contaminant.
* * * * *
    (iii) If the population served by the system is > 3,300 persons, 
then compositing may only be permitted by the State at sampling points 
within a single system. In systems serving  3,300 persons, 
the State may permit compositing among different systems provided the 
5-sample limit is maintained.
* * * * *
    22. In Sec. 141.24(f)(16), after ``EPA/600/4-88/039,'' add 
``December 1988, Revised July 1991''. Also, revise the toll-free 
telephone number at the end of the paragraph from ``800-336-4700'' to 
read ``800-553-6847''.
    23. In Sec. 141.24, remove and reserve paragraph (g).
    24. In Sec. 141.24, revise paragraph (h)(4)(i) to read as follows:
* * * * *
    (h) * * *
    (4) * * *
    (i) Each community and non-transient non-community water system 
shall take four consecutive quarterly samples for each contaminant 
listed in Sec. 141.61(c) during each compliance period beginning with 
the initial compliance period.
* * * * *
    25. In Sec. 141.24, add paragraphs (h)(10)(i), (h)(10)(ii), and 
(h)(10)(iii) to read as follows:
* * * * *
    (h) * * *
    (10) * * *
    (i) If the concentration in the composite sample detects one or 
more contaminants listed in Sec. 141.61(c), then a follow-up sample 
must be taken within 14 days at each sampling point included in the 
composite, and be analyzed for that contaminant.
    (ii) If duplicates of the original sample taken from each sampling 
point used in the composite are available, the system may use these 
duplicates instead of resampling. The duplicate must be analyzed and 
the results reported to the State within 14 days of collection.
    (iii) If the population served by the system is >3,300 persons, 
then compositing may only be permitted by the State at sampling points 
within a single system. In systems serving  3,300 persons, 
the State may permit compositing among different systems provided the 
5-sample limit is maintained.
* * * * *
    26. In Sec. 141.24, revise paragraph (h)(12) introductory text and 
add paragraph (h)(12)(xv) to read as follows:
* * * * *
    (h) * * *
    (12) Analysis for the contaminants listed in Sec. 141.61(c) and for 
endrin in Sec. 141.12(a) shall be conducted using the following EPA 
methods or their equivalent as approved by EPA. These methods are 
contained in ``Methods for the Determination of Organic Compounds in 
Drinking Water,'' EPA/600/4-88/039, December 1988, Revised July 1991 
and in ``Methods for the Determination of Organic Compounds in Drinking 
Water--Supplement I'', EPA/600/4-90/020, July 1990, and ``Supplement 
II'', EPA/600/R-92/129, August 1992, Environmental Monitoring Systems 
Laboratory, Cincinnati, OH 45268. These documents are available from 
the National Technical Information Service (NTIS) NTIS PB91-231480, 
PB91-146027 and PB92-207703, U.S. Department of Commerce, 5285 Port 
Royal Road, Springfield, Virginia 22161. The NTIS toll-free number is 
1-800-553-6847.
* * * * *
    (xv) Method 506, ``Determination of Phthalate and Adipate Esters in 
Drinking Water by Liquid-Liquid Extraction or Liquid-Solid Extraction 
and Gas Chromatography with Photoionization Detection.'' Method 506 can 
be used to measure di(2-ethylhexyl) adipate and di(2-ethylhexyl) 
phthalate.
* * * * *


 Sec. 141.28   [Amended]

    27. In Sec. 141.28, remove ``Approved laboratories'' in the heading 
and add ``Certified laboratories'', and remove ``laboratory approved'' 
in paragraph (a) and add ``laboratory certified''.


Sec. 141.32   [Amended]

    28. In Sec. 141.32(e)(30), the second sentence should be revised to 
read ``This organic chemical is a pesticide used to control 
termites.''.
    29. In Sec. 141.32(e)(33), the last sentence should be revised to 
read ``Drinking water that meets the EPA standard is associated with 
little to none of this risk and is considered safe with respect to cis-
1,2-dichloroethylene.''.
    30. In Sec. 141.32(e)(35), the word ``ruroff'' in the third 
sentence should be revised to read ``runoff''.
    31. In Sec. 141.32(e)(41), the word ``eposure'' in the first 
sentence should be revised to read ``exposure''.
    32. In Sec. 141.32(e)(62), before the word ``parts'', revise the 
number ``0.004'' to read ``0.006''.


Sec. 141.40   [Amended]

    33. In the title of Sec. 141.40, revise the word ``chemicals'' to 
read ``contaminants''.
    34. In Sec. 141.40(e)(5), revise the word ``Chlorobenzene'' to read 
``Dibromomethane''.
    35. In Sec. 141.40, revise paragraph (g) to read as follows: 
Sec. 141.40 Special monitoring for inorganic and organic contaminants.
* * * * *
    (g) Analysis for the organic contaminants in paragraphs (e) and (j) 
of this section shall be conducted using the recommended EPA methods, 
or their equivalent as determined by EPA. These methods are contained 
in the reference at Sec. 141.24(f)(16).
* * * * *
    36. In Sec. 141.40(h), remove ``laboratories approved'' and add 
``laboratories certified''; remove ``Sec. 141.24(g)(11)'' and add 
``Sec. 141.24(f)(17)''.
    37. In 141.40, remove paragraph (j)(2) and redesignate the 
remaining paragraphs (j)(3) through (j)(15) as paragraphs (j)(2) 
through (j)(14).
    38. In Sec. 141.40, revise paragraph (n)(11) to read as follows:
* * * * *
    (n) * * *
    (11) The listed methods are in the manuals cited at 
Sec. 141.24(h)(12). List of Unregulated Organic Contaminants: 

------------------------------------------------------------------------
        Organic contaminants                EPA analytical method       
------------------------------------------------------------------------
Aldicarb...........................  531.1                              
Aldicarb sulfone...................  531.1                              
Aldicarb sulfoxide.................  531.1                              
Aldrin.............................  505, 508, and 525.1                
Butachlor..........................  507, 525.1                         
Carbaryl...........................  531.1                              
Dicamba............................  515.1                              
Dieldrin...........................  505, 508, 525.1                    
3-hydroxycarbofuran................  531.1                              
Methomyl...........................  531.1                              
Metolachlor........................  507, 525.1                         
Metribuzin.........................  507, 525.1                         
Propachlor.........................  508, 525.1                         
------------------------------------------------------------------------

 * * * * *


Sec. 141.60   [Amended]

    39. In Sec. 141.60, revise paragraph (a)(3) to read as follows:


 Sec. 141.60   Effective dates.

    (a) * * *
    (3) The effective date for paragraphs (a)(19) through (a)(21), 
(c)(19) through (c)(25), and (c)(27) through (c)(33) of Sec. 141.61 is 
January 17, 1994. The effective date of Sec. 141.61(c)(26) is August 
17, 1992.
* * * * *


Sec. 141.61   [Amended]

    40. In the text preceding the table in Sec. 141.61(b), remove the 
word ``synthetic''.
    41. In Sec. 141.61(b), revise the table to read as follows:


Sec. 141.61   Maximum contaminant levels for organic contaminants.

* * * * *
    (b) * * *

                         BAT for Organic Contaminants Listed in Sec. 141.61 (a) and (c)                         
----------------------------------------------------------------------------------------------------------------
             CAS No.                                 Contaminant                       GAC       PTA       OX   
----------------------------------------------------------------------------------------------------------------
15972-60-8......................  Alachlor........................................      X     ........  ........
116-06-3........................  Aldicarb........................................      X     ........  ........
1646-88-4.......................  Aldicarb sulfone................................      X     ........  ........
1646-87-3.......................  Aldicarb sulfoxide..............................      X     ........  ........
1912-24-9.......................  Atrazine........................................      X     ........  ........
71-43-2.........................  Benzene.........................................      X         X     ........
50-32-8.........................  Benzo[a]pyrene..................................      X     ........  ........
1563-66-2.......................  Carbofuran......................................      X     ........  ........
56-23-5.........................  Carbon tetrachloride............................      X         X     ........
57-74-9.........................  Chlordane.......................................      X     ........  ........
75-99-0.........................  Dalapon.........................................      X     ........  ........
94-75-7.........................  2,4-D...........................................      X     ........  ........
103-23-1........................  Di (2-ethylhexyl) adipate.......................      X         X     ........
117-81-7........................  Di (2-ethylhexyl) phthalate.....................      X     ........  ........
96-12-8.........................  Dibromochloropropane (DBCP).....................      X         X     ........
95-50-1.........................  o-Dichlorobenzene...............................      X         X     ........
106-46-7........................  para-Dichlorobenzene............................      X         X     ........
107-06-2........................  1,2-Dichloroethane..............................      X         X     ........
75-35-4.........................  1,1-Dichloroethylene............................      X         X     ........
156-59-2........................  cis-1,2-Dichloroethylene........................      X         X     ........
156-60-5........................  trans-1,2-Dichloroethylene......................      X         X     ........
75-09-2.........................  Dichloromethane.................................  ........      X     ........
78-87-5.........................  1,2-Dichloropropane.............................      X         X     ........
88-85-7.........................  Dinoseb.........................................      X     ........  ........
85-00-7.........................  Diquat..........................................      X     ........  ........
145-73-3........................  Endothall.......................................      X     ........  ........
72-20-8.........................  Endrin..........................................      X     ........  ........
100-41-4........................  Ethylbenzene....................................      X         X     ........
106-93-4........................  Ethylene Dibromide (EDB)........................      X         X     ........
1071-83-6.......................  Gylphosate......................................  ........  ........      X   
76-44-8.........................  Heptachlor......................................      X     ........  ........
1024-57-3.......................  Heptachlor epoxide..............................      X     ........  ........
118-74-1........................  Hexachlorobenzene...............................      X     ........  ........
77-47-3.........................  Hexachlorocyclopentadiene.......................      X         X     ........
58-89-9.........................  Lindane.........................................      X     ........  ........
72-43-5.........................  Methoxychlor....................................      X     ........  ........
108-90-7........................  Monochlorobenzene...............................      X         X     ........
23135-22-0......................  Oxamyl (Vydate).................................      X     ........  ........
87-86-5.........................  Pentachlorophenol...............................      X     ........  ........
1918-02-1.......................  Picloram........................................      X     ........  ........
1336-36-3.......................  Polychlorinated biphenyls (PCB).................      X     ........  ........
122-34-9........................  Simazine........................................      X     ........  ........
100-42-5........................  Styrene.........................................      X         X     ........
1746-01-6.......................  2,3,7,8-TCDD (Dioxin)...........................      X     ........  ........
127-18-4........................  Tetrachloroethylene.............................      X         X     ........
108-88-3........................  Toluene.........................................      X         X     ........
8001-35-2.......................  Toxaphene.......................................      X     ........  ........
93-72-1.........................  2,4,5-TP (Silvex)...............................      X     ........  ........
120-82-1........................  1,2,4-Trichlorobenzene..........................      X         X     ........
71-55-6.........................  1,1,1-Trichloroethane...........................      X         X     ........
79-00-5.........................  1,1,2-Trichloroethane...........................      X         X     ........
79-01-6.........................  Trichloroethylene...............................      X         X     ........
75-01-4.........................  Vinyl chloride..................................  ........      X     ........
1330-20-7.......................  Xylene..........................................      X         X     ........
----------------------------------------------------------------------------------------------------------------

* * * * *
    42. In Sec. 141.61(c), in the table, revise the number ``0.003'' in 
the MCL column for the entry ``(4) 1646-87-4 Aldicarb sulfone'' to read 
``0.002''.


Sec. 141.62   [Amended]

    43. In Sec. 141.62(c), in key 11 under the table, revise 
``Ultraviolent'' to read ``Ultraviolet''.

PART 142--[AMENDED]

    44. The authority citation for part 142 continues to read as 
follows:

    Authority: 42 U.S.C. 300g, 300g-1, 300g-2, 300g-3, 300g-4, 300g-
5, 300g-6, 300j-4, and 300j-9.


Sec. 142.62  [Amended]

    45. The table in Sec. 142.62(a) is amended as follows:
    a. In the Best available technologies subheadings, revise ``PAT'' 
to read ``PTA'' and revise ``GAO'' to read ``GAC'';
    b. In the entry for ``(19) Alachlor'', remove the ``X'' in the 
``PTA'' column;
    c. In entry (38), in the contaminant column, revise ``Dalapone'' to 
read ``Dalapon''; and
    d. In the entry for ``(47) Hexachlorobenzene'', remove the ``X'' 
from the ``OX'' column and add the ``X'' to the ``GAC'' column.
[FR Doc. 94-16076 Filed 6-30-94; 8:45 am]
BILLING CODE 6560-50-P