[Code of Federal Regulations]
[Title 40, Volume 27]
[Revised as ofJuly 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR435.13]
[Page 303-304]
TITLE 40--PROTECTION OF ENVIRONMENT
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
PART 435--OIL AND GAS EXTRACTION POINT SOURCE CATEGORY--Table of Contents
Subpart A--Offshore Subcategory
Sec. 435.13 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology
economically achievable (BAT).
Except as provided in 40 CFR 125.30-32, any existing point source
subject to this subpart must achieve the following effluent limitations
representing the degree of effluent reduction attainable by the
application of the best available technology economically achievable
(BAT):
BAT Effluent Limitations
------------------------------------------------------------------------
Pollutant BAT effluent
Waste source parameter limitation
------------------------------------------------------------------------
Produced water................... Oil & grease.... The maximum for any
one day shall not
exceed 42 mg/l;
the average of
daily values for
30 consecutive
days shall not
exceed 29 mg/l.
Drilling fluids and drill
cuttings:
(A) For facilities located within ................ No discharge.\1\
3 miles from shore.
(B) For facilities located beyond
3 miles from shore:.
Water-based drilling fluids SPP Toxicity.... Minimum 96-hour
and associated drill LC50 of the SPP
cuttings. Toxicity Test \2\
shall be 3% by
volume.
Free oil........ No discharge.\3\
Diesel oil...... No discharge.
Mercury......... 1 mg/kg dry weight
maximum in the
stock barite.
Cadmium......... 3 mg/kg dry weight
maximum in the
stock barite.
Non-aqueous drilling fluids ................ No discharge.
(NAFs).
Drill cuttings associated with
non-aqueous drilling fluids:
Stock Limitations (C16-C18 Mercury......... 1 mg/kg dry weight
internal olefin). maximum in the
stock barite.
Cadmium......... 3 mg/kg dry weight
maximum in the
stock barite.
Polynuclear PAH mass ratio \5\
Aromatic shall not exceed
Hydrocarbons 1x10-5.
(PAH).
Sediment Base fluid sediment
toxicity. toxicity ratio \6\
shall not exceed
1.0.
Biodegradation Biodegradation rate
rate. ratio \7\ shall
not exceed 1.0.
Discharge Limitations........ Diesel oil...... No discharge.
SPP Toxicity.... Minimum 96-hour
LC50 of the SPP
Toxicity Test \2\
shall be 3% by
volume.
Sediment Drilling fluid
toxicity. sediment toxicity
ratio \8\ shall
not exceed 1.0.
Formation Oil... No discharge.\9\
Base fluid For NAFs that meet
retained on the stock
cuttings. limitations (C16-
C18 internal
olefin) in this
table, the maximum
weighted mass
ratio averaged
over all NAF well
sections shall be
6.9 g-NAF base
fluid/100 g-wet
drill
cuttings.\10\
For NAFs that meet
the C12-C14 ester
or C8 ester stock
limitations in
footnote 11 of
this table, the
maximum weighted
mass ratio
averaged over all
NAF well sections
shall be 9.4 g-NAF
base fluid/100 g-
wet drill
cuttings.
Well treatment, completion, and Oil and grease.. The maximum for any
workover fluids. one day shall not
exceed 42 mg/l;
the average of
daily values for
30 consecutive
days shall not
exceed 29 mg/l.
Deck drainage.................... Free oil........ No discharge.\4\
Produced sand.................... ................ No discharge.
Domestic Waste................... Foam............ No discharge.
------------------------------------------------------------------------
\1\ All Alaskan facilities are subject to the drilling fluids and drill
cuttings discharge limitations for facilities located beyond 3 miles
offshore.
\2\ As determined by the suspended particulate phase (SPP) toxicity test
(Appendix 2 of subpart A of this part).
\3\ As determined by the static sheen test (appendix 1).
\4\ As determined by the presence of a film or sheen upon or a
discoloration of the surface of the receiving water (visual sheen).
[[Page 304]]
\5\ PAH mass ratio = Mass (g) of PAH (as phenanthrene)/Mass (g) of stock
base fluid as determined by EPA Method 1654, Revision A, (specified at
Sec. 435.11(u)) entitled ``PAH Content of Oil by HPLC/UV,'' December
1992, which is published in Methods for the Determination of Diesel,
Mineral, and Crude Oils in Offshore Oil and Gas Industry Discharges,
EPA-821-R-92-008. This incorporation by reference was approved by the
Director of the Federal Register in accordance with 5 U.S.C. 552(a)
and 1 CFR part 51. Copies may be obtained from the National Technical
Information Service, Springfield, VA 22161, 703-605-6000. Copies may
be inspected at the Office of the Federal Register, 800 North Capitol
Street, NW., Suite 700, Washington, DC. A copy may also be inspected
at EPA's Water Docket, 1200 Pennsylvania Ave., NW., Washington, DC
20460.
\6\ Base fluid sediment toxicity ratio = 10-day LC50 of C16-C18 internal
olefin/10-day LC50 of stock base fluid as determined by ASTM E 1367-92
[specified at Sec. 435.11(ee)] method: ``Standard Guide for
Conducting 10-day Static Sediment Toxicity Tests with Marine and
Estuarine Amphipods,'' 1992, after preparing the sediment according to
the method specified in Appendix 3 of subpart A of this part. This
incorporation by reference was approved by the Director of the Federal
Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies
may be obtained from the American Society for Testing and Materials,
100 Barr Harbor Drive, West Conshohocken, PA, 19428. Copies may be
inspected at the Office of the Federal Register, 800 North Capitol
Street, NW., Suite 700, Washington, DC. A copy may also be inspected
at EPA's Water Docket, 1200 Pennsylvania Ave., NW., Washington, DC
20460.
\7\ Biodegradation rate ratio = Cumulative gas production (ml) of C16-
C18 internal olefin/Cumulative gas production (ml) of stock base
fluid, both at 275 days as determined by ISO 11734:1995 [specified at
Sec. 435.11(e)] method: ``Water quality--Evaluation of the `ultimate'
anaerobic biodegradability of organic compounds in digested sludge--
Method by measurement of the biogas production (1995 edition)'' as
modified for the marine environment (Appendix 4 of subpart A of this
part). This incorporation by reference was approved by the Director of
the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part
51. Copies may be obtained from the American National Standards
Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036. Copies
may be inspected at the Office of the Federal Register, 800 North
Capitol Street, NW., Suite 700, Washington, DC. A copy may also be
inspected at EPA's Water Docket, 1200 Pennsylvania Ave., NW.,
Washington, DC 20460.
\8\ Drilling fluid sediment toxicity ratio = 4-day LC50 of C16-C18
internal olefin drilling fluid/4-day LC50 of drilling fluid removed
from drill cuttings at the solids control equipment as determined by
ASTM E 1367-92 (specified at Sec. 435.11(ee)) method: ``Standard
Guide for Conducting 10-day Static Sediment Toxicity Tests with Marine
and Estuarine Amphipods,'' 1992, after preparing the sediment
according to the method specified in Appendix 3 of subpart A of this
part. This incorporation by reference was approved by the Director of
the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part
51. Copies may be obtained from the American Society for Testing and
Materials, 100 Barr Harbor Drive, West Conshohocken, PA, 19428. Copies
may be inspected at the Office of the Federal Register, 800 North
Capitol Street, NW., Suite 700, Washington, DC. A copy may also be
inspected at EPA's Water Docket, 1200 Pennsylvania Ave., NW.,
Washington, DC 20460.
\9\ As determined before drilling fluids are shipped offshore by the GC/
MS compliance assurance method (Appendix 5 of subpart A of this part),
and as determined prior to discharge by the RPE method (Appendix 6 of
subpart A of this part) applied to drilling fluid removed from drill
cuttings. If the operator wishes to confirm the results of the RPE
method (Appendix 6 of subpart A of this part), the operator may use
the GC/MS compliance assurance method (Appendix 5 of subpart A of this
part). Results from the GC/MS compliance assurance method (Appendix 5
of subpart A of this part) shall supercede the results of the RPE
method (Appendix 6 of subpart A of this part).
\10\ Maximum permissible retention of non-aqueous drilling fluid (NAF)
base fluid on wet drill cuttings averaged over drilling intervals
using NAFs as determined by the API retort method (Appendix 7 of
subpart A of this part). This limitation is applicable for NAF base
fluids that meet the base fluid sediment toxicity ratio (Footnote 6),
biodegradation rate ratio (Footnote 7), PAH, mercury, and cadmium
stock limitations (C16-C18 internal olefin) defined above in this
table.
\11\ Maximum permissible retention of non-aqueous drilling fluid (NAF)
base fluid on wet drill cuttings average over drilling intervals using
NAFs as determined by the API retort method (Appendix 7 of subpart A
of this part). This limitation is applicable for NAF base fluids that
meet the ester base fluid sediment toxicity ratio and ester
biodegradation rate ratio stock limitations defined as: (a) ester base
fluid sediment toxicity ratio = 10-day LC50 of C12-C14 ester or C8
ester /10-day LC50 of stock base fluid as determined by ASTM E 1367-92
(specified at Sec. 435.11(ee)) method: ``Standard Guide for
Conducting 10-day Static Sediment Toxicity Tests with Marine and
Estuarine Amphipods,'' 1992, after preparing the sediment according to
the method specified in Appendix 3 of subpart A of this part. This
incorporation by reference was approved by the Director of the Federal
Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies
may be obtained from the American Society for Testing and Materials,
100 Barr Harbor Drive, West Conshohocken, PA, 19428. Copies may be
inspected at the Office of the Federal Register, 800 North Capitol
Street, NW., Suite 700, Washington, DC. A copy may also be inspected
at EPA's Water Docket, 1200 Pennsylvania Ave., NW., Washington, DC
20460. (b) ester biodegradation rate ratio = Cumulative gas production
(ml) of C12-C14 ester or C8 ester/Cumulative gas production (ml) of
stock base fluid, both at 275 days as determined by ISO 11734:1995
(specified at Sec. 435.11(e)) method: ``Water quality--Evaluation of
the `ultimate' anaerobic biodegradability of organic compounds in
digested sludge--Method by measurement of the biogas production (1995
edition)'' as modified for the marine environment (Appendix 4 of
subpart A of this part). This incorporation by reference was approved
by the Director of the Federal Register in accordance with 5 U.S.C.
552(a) and 1 CFR part 51. Copies may be obtained from the American
National Standards Institute, 11 West 42nd Street, 13th Floor, New
York, NY 10036. Copies may be inspected at the Office of the Federal
Register, 800 North Capitol Street, NW., Suite 700, Washington, DC. A
copy may also be inspected at EPA's Water Docket, 1200 Pennsylvania
Ave., NW., Washington, DC 20460. (c) PAH mass ratio (Footnote 5),
mercury, and cadmium stock limitations (C16-C18 internal olefin)
defined above in this table.
[58 FR 12504, Apr. 13, 1979, as amended at 66 FR 6898, Jan. 22, 2001]