National Fuel Gas Supply Corporation

Fourth Revised Volume No. 1

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Effective Date: 10/01/2001, Docket: RP00-399-004, Status: Effective

Original Sheet No. 477C Original Sheet No. 477C : Effective

GENERAL TERMS AND CONDITIONS

33. OPERATIONAL FLOW ORDERS (Cont'd)

33.5 Degrees of Severity of OFO's

If Transporter determines that it is necessary to issue an OFO,

Transporter will classify the OFO within one of the following three

levels of severity, with Level 1 representing the least severe

operational condition and Level 3 representing the most severe

operational condition:

Level 1: Transporter experiences a condition covered by Section

33.2(a) that is not a Level 2 or Level 3 condition.

Level 2: Transporter experiences a condition covered by Section

33.2(a) during the non-heating season (May-October) that threatens

service to local markets directly connected to Transporter's

system.

Level 3: Transporter experiences a condition covered by Section

33.2(a) during the heating season (November-April) that threatens

service to local markets directly connected to Transporter's

system.