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. See Sec. 435.11(gg).\3\ As determined by the static sheen test. See Sec. 435.11(hh).\4\ As determined by the presence of a film or sheen upon or a
discoloration of the surface of the receiving water (visual sheen).\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 as an appendix to subpart A of this part and
in ``Analytic Methods for the Oil and Gas Extraction Point Source
Category,'' EPA-821-R-11-004. See Sec. 435.11(uu).\6\ Base fluid sediment toxicity ratio = 10-day LC5. of C16-C18 internal
olefin/10-day LC5. of stock base fluid as determined by EPA Method
1644: ``Method for Conducting a Sediment Toxicity Test with
Leptocheirus plumulosus and Non-Aqueous Drilling Fluids or Synthetic-
Based Drilling Muds'' after preparing the sediment according to the
procedure specified in EPA Method 1646, which are published as
appendices to subpart A of this part and in ``Analytic Methods for the
Oil and Gas Extraction Point Source Category,'' EPA-821-R-11-004. See
Sec. 435.11(ee) and (uu).\7\ Biodegradation rate ratio = Cumulative headspace gas production (ml)
of C16-C18 internal olefin/Cumulative headspace gas production (ml) of
stock base fluid, both at 275 days as determined by EPA Method 1647,
which is published as an appendix to subpart A of this part and in
``Analytic Methods for the Oil and Gas Extraction Point Source
Category,'' EPA-821-R-11-004. See Sec. 435.11(e) and (uu).\8\ Drilling fluid sediment toxicity ratio = 4-day LC5. of C16-C18
internal olefin drilling fluid/4-day LC5. of drilling fluid removed
from drill cuttings at the solids control equipment as determined by
EPA Method 1644: ``Method for Conducting a Sediment Toxicity Test with
Leptocheirus plumulosus and Non-Aqueous Drilling Fluids or Synthetic-
Based Drilling Muds'' after sediment preparation procedures specified
in EPA Method 1646, which are published as appendices to subpart A of
this part and in ``Analytic Methods for the Oil and Gas Extraction
Point Source Category,'' EPA-821-R-11-004. See Sec. 435.11(ee) and
(uu).\9\ As determined before drilling fluids are shipped offshore by the GC/
MS compliance assurance method (EPA Method 1655), and as determined
prior to discharge by the RPE method (EPA Method 1670) applied to
drilling fluid removed from drill cuttings. If the operator wishes to
confirm the results of the RPE method (EPA Method 1670), the operator
may use the GC/MS compliance assurance method (EPA Method 1655).
Results from the GC/MS compliance assurance method (EPA Method 1655)
shall supersede the results of the RPE method (EPA Method 1670). EPA
Method 1655 and 1670 are published as appendices to subpart A of this
part and in ``Analytic Methods for the Oil and Gas Extraction Point
Source Category,'' EPA-821-R-11-004. See Sec. 435.11(uu).\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 EPA Method 1674, which is published as an
appendix to subpart A of this part and in ``Analytic Methods for the
Oil and Gas Extraction Point Source Category,'' EPA-821-R-11-004. See
Sec. 435.11(uu). 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 EPA Method 1674, which is published as an
appendix to subpart A of this part and in ``Analytic Methods for the
Oil and Gas Extraction Point Source Category,'' EPA-821-R-11-004. See
Sec. 435.11(uu). 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 LC5. of C12-C14
ester or C8 ester/10-day LC5. of stock base fluid as determined by EPA
Method 1644: ``Method for Conducting a Sediment Toxicity Test with
Leptocheirus plumulosus and Non-Aqueous Drilling Fluids or Synthetic-
Based Drilling Muds'' after sediment preparation procedures specified
in EPA Method 1646, which are published as appendices to subpart A of
this part and in ``Analytic Methods for the Oil and Gas Extraction
Point Source Category,'' EPA-821-R-11-004. See Sec. 435.11(ee) and
(uu);(b) ester biodegradation rate ratio = Cumulative headspace gas
production (ml) of C12-C14 ester or C8 ester/Cumulative headspace gas
production (ml) of stock base fluid, both at 275 days as determined by
EPA Method 1647, which is published as an appendix to subpart A of
this part and in ``Analytic Methods for the Oil and Gas Extraction
Point Source Category,'' EPA-821-R-11-004. See Sec. 435.11(e) and
(uu); and(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; 69 FR 18803, Apr. 9, 2004; 77 FR 29836, May 18, 2012]