40 CFR Appendix 8 to Subpart A of Part 435, Reference C16-C18 Internal Olefin Drilling Fluid Formulation

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Appendix 8 to Subpart A of Part 435 - Reference C16-C18 Internal Olefin Drilling Fluid Formulation

The reference C16-C18 internal olefin drilling fluid used to determine the drilling fluid sediment toxicity ratio and compliance with the BAT sediment toxicity discharge limitation (see § 435.13) and NSPS (see § 435.15) shall be formulated to meet the specifications in Table 1 of this appendix.

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 § 435.11(ee) and (uu).

Table 1 - Properties for Reference C16-C18 IOs SBF Used in Discharge Sediment Toxicity Testing

Mud weight of SBF discharged with cuttings (pounds per gallon) Reference C16-C18 IOs SBF (pounds per gallon) Reference C16-C18 IOs SBF synthetic to water ratio (%)
8.5-11 9.0 75/25
>11-14 11.5 80/20
>14 14.5 85/15
Plastic Viscosity (PV), centipoise (cP) 12-30
Yield Point (YP), pounds/100 sq. ft 10-20
10-second gel, pounds/100 sq. ft 8-15
10-minute gel, pounds/100 sq. ft 12-30
Electrical stability, V >300
[ 66 FR 6901, Jan. 22, 2001, as amended at 77 FR 29845, May 18, 2012]

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United States Code

Title 40 published on 2015-08-22

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR Part 435 after this date.

  • 2016-12-07; vol. 81 # 235 - Wednesday, December 7, 2016
    1. 81 FR 88126 - Effluent Limitations Guidelines and Standards for the Oil and Gas Extraction Point Source Category—Implementation Date Extension
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      The final rule is effective December 7, 2016. In accordance with 40 CFR part 23, this regulation shall be considered issued for purposes of judicial review at 1 p.m. Eastern time on December 21, 2016. Under section 509(b)(1) of the CWA, judicial review of this regulation can be had only by filing a petition for review in the U.S. Court of Appeals within 120 days after the regulation is considered issued for purposes of judicial review. Under section 509(b)(2), the requirements in this regulation may not be challenged later in civil or criminal proceedings brought by EPA to enforce these requirements.
      40 CFR Part 435