GBUAPCD RULE 424 GEOTHERMAL EMISSIONS STANDARDS
LAST REVISED 11/11/11

RULE 424. Geothermal Emissions Standards

A. No person shall discharge into the atmosphere from any geothermal operation, sulfur compounds, calculated as sulfur dioxide (SO2), in excess of 1,000 ppm.

B. No person shall discharge into the atmosphere from any geothermal power plant more than 100 grams/MwHr of hydrogen sulfide, H2S.

C. No person shall discharge into the atmosphere from any geothermal well, including well drillings, well reworking and well testing, more than 2.5 kg/hr/well of hydrogen sulfide H2S.

D. No person shall discharge into the atmosphere from any miscellaneous steam supply operation more than 2.5 kg/hr/ source of hydrogen sulfide H2S.

E. Upon an unscheduled outage, an operator shall, within four (4) hours or less, reduce H2S emissions: (1) by 90% or more for dual units or, (2) by 65% or more for single units or when both units of a dual unit system have a simultaneous outage or, (3) to not more than 15 kg/hr. For scheduled outages, the same emissions standards shall be met within one (1) hour or less.

F. A summary of the data required to determine compliance with applicable provisions of this rule shall be submitted to the Air Pollution Control Officer. This summary shall be presented in the manner, frequency and form as prescribed by the Air Pollution Control Officer.

G. Definitions

1. Gross Megawatt Hour (MwHr) means the gross amount of electrical generating capacity of a power plant as guaranteed by the turbine generator manufacturer, prior to internal plant requirements, expressed in megawatt hours.

2. Miscellaneous Steam Supply Operation means any operation associated with providing steam for a geothermal power plant, excluding well drilling, well reworking, and well testing.