MOJAVE DESERT AIR QUALITY MANAGEMENT DISTRICT
RULE 464 - OIL-WATER SEPARATORS
(Adopted: May 7, 1976, Amended: August 24, 1994)
For the purposes of this rule only, the following definitions shall apply:
metallic carbides or carbonates,
1,1,1- trichloro-2,2,2-trifluoroethane (CFC-113),
2-chloro-1,1,1,2-tetrafluoroethane (HCFC 124),
and the following four classes of perfluorocarbon (PFC) compounds:
(i) cyclic, branched, or linear, completely fluorinated alkanes,
(ii) cyclic, branched, or linear, completely fluorinated ethers with no unsaturations,
(iii) cyclic, branched, or linear, completely fluorinated tertiary amines with no unsaturations, and
(iv) saturated perfluorocarbons containing sulfur with sulfur bonds only to carbon and fluorine.
(C) GENERAL REQUIREMENTS
(a) A person shall not use any oil-water separator subject to the provisions of Section (A)(2), unless it has been equipped with one of the following vapor loss control devices:
(i) A fixed cover with all openings sealed and totally enclosing the liquid contents of the compartment, except for such breathing vents as are structurally necessary; or
(ii) a floating cover, equipped with seals to enclose any space between the cover's edge and compartment wall or
(iii) Route all vapors to a control device with an overall control efficiency (collection and control efficiencies) of at least 90 percent by weight of VOCs, measured according to the test method specified in Section (G)(4).
(b) Any oil-water separator subject to this rule shall provide the following vapor loss control device:
(i) a fixed cover for all forebays, such that no liquid surface is exposed to the atmosphere.
(a) Covers for oil-water separators shall meet the following requirements:
(i) The cover material shall be impermeable to VOCs, and free from holes or openings.
(ii) Any gauging or sampling devices on the compartment cover shall be covered. The latter cover shall be kept closed, with no visible gaps between the cover and the compartment, except when the sampling device is being used.
(iii) Hatches on covers shall be kept closed and free of gaps, except when opened for inspection, maintenance or repair.
(iv) The perimeter of a cover, except for a floating cover, shall form a seal free of gaps with the foundation to which it is installed.
(a) When an instrument reading of 10,000 parts per million [ppm] or greater is measured, a leak has been detected and the reading shall constitute a violation of this rule.
(a) segregated storm water runoff drain systems or to non-contact cooling water systems, where applicable.
(a) Date of the inspection.
(b) Findings, (statement of no leaks or the location, nature and severity of the leak(s)) including instrument readings.
(c) Leak determination method (shall be in accordance to the test method specified in Section (G)(1), using an appropriate hydrocarbon analyzer).
(d) Corrective action (date of leak repair and a written justification for any repair interval in excess of 15 calendar days).
(e) Inspector's name and signature.
(G) TEST METHODS FOR COMPLIANCE VERIFICATION
A violation determined by any one of these test methods shall constitute a violation of the rule:
for systems utilizing add-on control equipment, EPA Method 25 or 25A, as applicable.
for incinerators or catalytic incinerators, EPA Method 25, unless the concentration of VOC in the outlet stream is below 50 ppm as carbon, in which case EPA Method 25A shall be used.