Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 725 - INTERIM STATUS STANDARDS FOR OWNERS AND OPERATORS OF HAZARDOUS WASTE TREATMENT, STORAGE, AND DISPOSAL FACILITIES
Subpart BB - AIR EMISSION STANDARDS FOR EQUIPMENT LEAKS
Section 725.957 - Standards: Valves in Gas/Vapor or Light Liquid Service
Current through Register Vol. 48, No. 38, September 20, 2024
a) Each valve in gas/vapor or light liquid service must be monitored monthly to detect leaks by the methods specified in Section 725.963(b) and must comply with subsections (b) through (e), except as provided in subsections (f), (g), and (h) and in Sections 725.961 and 725.962.
b) If an instrument reading of 10,000 ppm or greater is measured, a leak is detected.
c) Monitoring Frequency
d) Leak Repair
e) First attempts at repair include, but are not limited to the following best practices where practicable:
f) Any valve that is designated, as described in Section 725.964(g)(2), for no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, is exempt from the requirements of subsection (a) if the valve fulfills the following requirements:
g) Any valve that is designated, as described in Section 725.964(h)(1), as an unsafe-to-monitor valve is exempt from the requirements of subsection (a), if the following conditions are fulfilled:
h) Any valve that is designated, as described in Section 725.964(h)(2), as a difficult-to-monitor valve is exempt from the requirements of subsection (a), if the following conditions are fulfilled: