CFR > Title 30 - Mineral Resources > CHAPTER II—MINERALS MANAGEMENT SERVICE, DEPARTMENT OF THE INTERIOR > SUBCHAPTER B—OFFSHORE (parts 250 to 285) > PART 250—OIL AND GAS AND SULPHUR OPERATIONS IN THE OUTER CONTINENTAL SHELF > SUBPART B—Plans and Information (§250.200 to §250.299) > 250.245—What hydrogen sulfide (H2S) information must accompany the DPP or DOCD?

250.245—What hydrogen sulfide (H2S) information must accompany the DPP or DOCD?

The following H2 S information, as applicable, must accompany your DPP or DOCD:
(a) Concentration. The estimated concentration of any H2 S you might encounter or handle while you conduct your proposed development and production activities.
(b) Classification. Under § 250.490(c), a request that the Regional Supervisor classify the area of your proposed development and production activities as either H2 S absent, H2 S present, or H2 S unknown. Provide sufficient information to justify your request.
(c) H 2 S Contingency Plan. If you request that the Regional Supervisor classify the area of your proposed development and production activities as either H2 S present or H2 S unknown, an H2 S Contingency Plan prepared under § 250.490(f), or a reference to an approved or submitted H2 S Contingency Plan that covers the proposed development and production activities.
(d) Modeling report. (1) If you have determined or estimated that the concentration of any H2 S you may encounter or handle while you conduct your development and production activities will be greater than 500 parts per million (ppm), you must:
(i) Model a potential worst case H2 S release from the facilities you will use to conduct your proposed development and production activities; and
(ii) Include a modeling report or modeling results, or a reference to such report or results if you have already submitted it to the Regional Supervisor.
(2) The analysis in the modeling report must be specific to the particular site of your development and production activities, and must consider any nearby human-occupied OCS facilities, shipping lanes, fishery areas, and other points where humans may be subject to potential exposure from an H2 S release from your proposed activities.
(3) If any H2 S emissions are projected to affect an onshore location in concentrations greater than 10 ppm, the modeling analysis must be consistent with the EPA's risk management plan methodologies outlined in 40 CFR part 68.