( Adopted: 05/07/76; CARB Ex. Ord. G-73: 02/01/77; Readopted: 07/25/77; Amended: 08/24/94; Amended: mm/dd/yy)

MDAQMD Rule 464 464-1 Oil-Water Separators D1: 05/21/14 

## RULE 464

Oil-Water Separators

(A) General (1) Purpose : (a) The purpose of this rule is to reduce emissions of Vv olatile Oo rganic Cc ompounds (VOCs) from Oo il- Ww ater Ss eparators. (2) Applicability : (a) This rule applies to Oil-Water Separators including Air Flotation Units as defined in this rule, and process units or containe rs used to store skimmed oil or tar from Oil-Water Separators. any structure or system which collects process effluent water contaminated with o il or other petroleum products and recovers 760 liters (201 gallons) a da y or more of any petroleum products with a Reid vapor pressure of 25 mm Hg (0.5 pound per square inch) or greater. [Derived from SJVUAPCD Rule 4625. Size limitation moved to exemption section (D)(1)(b).]



### (B) Definitions For the purposes of this rule only, the following d efinitions shall apply: (1) “Air Flotation Unit” – Equipment used to remove sus pended matter, both oil and solid, from water by dissolving air under pressure and then releasing the air at atmospheric pressure in a tank or basin. [Derived from SJVUAPCD Rule 4625 §3.1.] (2) “Air Pollution Control Officer” (APCO) - The person appointed to the position of Air Pollution Control Officer of the District pursuant to the provisions of California Health & Safety Code §40750 and his or her designee

. [Derived from MDAQMD Rule 1113.] (3) “California Air Resources Board (CARB)” - The C alifornia State Air Resources Board, the Executive Officer of CARB and his or her authorized representative, the powers and duties of which are described in Par t 2 of Division 26 of the California Health & Safety Code (commencing with Se ction 39500). [Derived from MDAQMD Rule 1113.] (4) “Control Device” - Any device for reducing emission s of VOC to the atmosphere.464-2 MDAQMD Rule 464 Oil-Water Separators D1: 05/21/14 ( 52 ) “Effluent Water” - Any wastewater generated as a byproduct of industrial processes and containing dissolved, particulate org anic materials. Consists of a mixture of water with a petroleum product, includin g but not limited to the following: gasoline, kerosene, distillate fuel oils , residual fuel oils and lubricants. ( 63 ) “Fixed Cover” - Any cover made out of metal(s), p olymer(s) or other material, and installed in a permanent position over the liqu id. ( 74 ) “Floating Cover” - Any cover made out of metal(s) , polymer(s) or other material, which is in contact with a liquid surface at all ti mes. ( 85 ) “Forebay” - That section of a gravity-type separa tor which (a) receives the untreated, contaminated Ee ffluent Ww ater from the preseparator flume, and (b) acts as a header which distributes the influent to the separator channels. ( 96 ) “Fugitive Vapor Leak (Leak)” - The detection of 10,000500 ppm or greater above background (expressed as methane) , measured at the interface of the component using an appropriate hydrocarbon analyzer when sampling is performed according to the procedures specified in EPA Method 21. [Derived from BAAQMD Rule 8- 8-204 definition for “vapor-tight.”] ( 107 ) “Non-Contact Water Cooling Systems” - Any system which involves the cooling of organic vapors via coolant injected through pipi ng. There is no contact between the cooling fluid and the vapors being cool ed. ( 118 ) “Oil-Water Separator” - Any device or piece of eq uipment, which utilizes the difference in density between oil or petroleum prod ucts and water to remove the oil or associated chemicals from the water , or any device, such as a flocculation tank, clarifier, etc. that removes petroleum-derive d compounds from wastewater

. [Definition updated to match SJVUAPCD Rule 4624 def inition for “Wastewater Separator” more closely.] (12) “Operator” – Includes, but is not limited to, any person who owns, leases, supervises, or operates a facility and/or equipment

. [Derived from SJVUAPCD Rule 4625 §3.7.] ( 139 ) “Organic Materials” - Chemical compounds of carbo n, excluding carbon monoxide, carbon dioxide, metallic carbides, metall ic carbonates and ammonium carbonate. (1 40 ) “Organic Vapors” - Chemical compounds of carbon, excluding carbon monoxide, carbon dioxide, metallic carbides, metallic carbona tes and ammonium carbonate in their gaseous state. (1 51 ) “Overall Control Efficiency” - Is tT he product of the capture efficiency multiplied by the control efficiency; the weight per unit time of VOC removed by a control device divided by the weight per unit time of VOC e mitted by an emission source, expressed as a percentage.MDAQMD Rule 464 464-3

Oil-Water Separators D1: 05/21/14 (1 62 ) “Petroleum Products” - Any crude oil or oil disti llate derived from tar sands, shale or coal, including, but not limited to gasoline, ke rosene, distillate fuel oils, residual fuel oils and lubricants. (1 73 ) “Reid Vapor Pressure” - The absolute vapor pressu re of volatile crude oil and volatile nonviscous petroleum liquids, except liqui fied petroleum gases, as determined by ASTM D 323-89. (18) “United States Environmental Protection Agency ” (USEPA) - The United States Environmental Protection Agency, the Administrator of the USEPA and his or her authorized representative. [Derived from MDAQMD Rule 1113.] (1 94 ) “Vapor Recovery System” - A vapor-gathering syste m capable of collecting VOC vapors and gases emitted during the operation of eq uipment. ( 2015 ) “Volatile Organic Compound (VOC)” - Any volatile compound containing at least one atom of carbon, excluding methane, carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate, and those compounds listed in 40 CFR 51.100(s). contain ing at least one atom of carbon, except for the following: [Derived from MDAQMD Rule 1113 for consistency.]

methane carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, ammonium carbonate, 1,1,1-trichloroethane, methylene chloride, trichlorofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), chlorodifluoromethane (HCFC-22), trifluoromethane (HFC-23) 1,1,1- trichloro-2,2,2-trifluoroethane (CFC-113),464-4 MDAQMD Rule 464 Oil-Water Separators D1: 05/21/14 1-chloro-1,1-difluoro-2-chloro-2,2-difluoroethane ( CFC-114), chloropentafluoroethane (CFC-115), 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123), 2-chloro-1,1,1,2-tetrafluoroethane (HCFC 124), pentafluoroethane (HFC-125), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1-dichloro-1-fluoroethane (HCFC-141b), 1-chloro-1,1-difluoroethane (HCFC-142b), 1,1,1-trifluoroethane (HFC-143a), 1,1-difluoroethane (HFC-152a), and the following four classes of perfluorocarbon ( PFC) compounds: (i) cyclic, branched, or linear, completely fluorin ated alkanes, (ii) cyclic, branched, or linear, completely fluori nated ethers with no unsaturations, (iii) cyclic, branched, or linear, completely fluor inated tertiary amines with no unsaturations, and (iv) saturated perfluorocarbons containing sulfur w ith sulfur bonds only to carbon and fluorine

. 

### (C) General Requirements (1) Fugitive Vapor Control Devices (a) A person shall not use any Oo il- Ww ater Ss eparator subject to the provisions of Section (A)(2), unless it has been eq uipped with one of the following vapor loss control devices , except when gauging or sampling is taking place : (i) A Ff

ixed Cc over with all openings sealed and totally enclosing the liquid contents of the compartment, except for such breathing vents as are structurally necessary; or (ii) Aa Ff

loating Cc over

or double-deck type cover , equipped with with closure seals that have no holes or tears, installed andMDAQMD Rule 464 464-5

Oil-Water Separators D1: 05/21/14 maintained so that gaps between the compartment wal l and seal shall not exceed one-eighth inch for an accumulativ e length of 97 percent of the perimeter of the tank, and shall not exceed one-half inch for an accumulative length of the remaining th ree percent of the tank. No gap between the compartment wall and the seal shall exceed one-half inch; to enclose any space between the cover's edge and compartment wall or (iii) Route all vapors to a Cc ontrol Dd evice with an Oo verall Cc ontrol Ee fficiency (collection and control efficiencies) of at least 9 50 percent by weight of VOCs, measured according to th e test method specified in Section (G)( 34 ). [Overall control efficiency increased to meet RACT limit in SJVUAPCD Rule 4625 §5.1.3. U pdated rule citation.] (b) Any oil-water separator subject to this rule sh all provide the following vapor loss control device: (i) Aa Ff

ixed Cc over for all Ff

orebays, such that no liquid surface is exposed to the atmosphere. (c) Skimmed oil or tar removed from Oil-Water Separ ators shall be either charged to process units with feed or transferred t o a container with a control system with at least 90 percent control eff iciency by weight. A Control Device must be under District permit. [Control efficiency added to meet RACT requirement in SJVUAPCD Rule 4625 §5.4.] (2) Requirements for Covers (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 compart ment 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 fr ee of gaps, except when opened for inspection, maintenance or repair. (iv) The perimeter of a cover, except for a Ff loating Cc over, shall form a seal free of gaps with the foundation to which it is installed. (3) Fugitive Vapor Leak Monitoring (a) When an instrument reading of 10,000500 parts per million [( ppm )] or greater is measured, a leak has been detected and t he reading shall constitute a violation of this rule. [Updated for RACT.]464-6 MDAQMD Rule 464 Oil-Water Separators D1: 05/21/14 

### (D) Exemptions (1) The provisions of this rule shall not apply to: (a) Ss egregated storm water runoff drain systems or to no n-contact cooling water systems, where applicable. (b) Any system which collects and processes effluen t or process water contaminated with oil or other petroleum products a nd recovers less than 760 liters (201 gallons) a day or more of oil or ot her petroleum products (c) Oils, tars and petroleum products with a Reid V apor Pressure of less than 25 mm Hg (0.5 pound per square inch). [(D)(1)(b) and (c) relocated from applicability sec tion and separated to address comment from Searles Valley Minerals of 4/9/14.]



### (E) Monitoring (1) Monitoring for Ff ugitive Vv apor Ll eaks shall be performed on a monthly basis and in accordance to test method specified in Secti on (G)(1). Monitoring records shall be kept on file as prescribed in Section (F)( 1). (2) Monitoring of the control device shall be perfo rmed on an annual basis and in accordance to the test method specified in Section (G)(4).



### (F) Record Keeping (1) A log of the monthly leak inspection shall be k ept on file at the facility. The log shall record, at a minimum, the following informati on: (a) Date of the inspection. (b) Findings, (statement of no leaks or the location, n ature and severity of the leak(s)) including instrument readings.Documentatio n of all written or machine recorded operator inspections, VOC measurem ents including corresponding background levels, source tests, repa irs, replacements, and reinspection records. [Updated to more comprehensive recordkeeping requirements in SCAQMD Rule 1176 §(g)(C)(i).] (c) Leak determination method (shall be in accordan ce to the test method specified in Section (G)(1), using an appropriate h ydrocarbon analyzer). (d) Corrective action (date of leak repair and a wr itten justification for any repair interval in excess of 15 calendar days).MDAQMD Rule 464 464-7

Oil-Water Separators D1: 05/21/14 (e) Inspector's name and signature. (2) Any person using an emission control device/sys tem pursuant to Section (C)(1) as a means of complying with provisions of this rule s hall maintain records of key system operating and maintenance data for the purpo se of demonstrating continuous compliance during periods of emission pr oducing activities. The data shall be recorded in a manner as prescribed by the District. (3) Any facility claiming exemption pursuant to Sec tions ( D ) (1) (a) or ( DA )( 12 ) (b) of this rule shall keep records to substantiate the cl aimed exempt status. [Rule citations updated.] (4) Any record required or produced pursuant to thi s rule shall be retained on site for a minimum of two five (5) years and shall be made available to the APCO upon request. [Updated to meet SJVUPACD Rule 4625 §6.2.3.]



### (G) Test Methods For Compliance Verification A violation determined by any one of these test met hods shall constitute a violation of the rule: (1) Fugitive Vapor Leaks - Detection of VOCs - EPA Method 21 shall be used to determine compliance with this rule in regards to f ugitive or VOC leaks. Instrument shall be calibrated with Method 21 using zero air (less than 10 parts per million ([ ppm )] of hydrocarbon in air) with a mixture of methane o r n-hexane. (2) Determination of Exempt Compounds Content - Det ermination of the content of exempt compounds in solvents or any diluents shall be determined by ASTM D 4457-85. Perfluorocarbon compounds shall be assume d to be absent from a product or process unless a manufacturer or facilit y operator identifies the specific individual compounds (from the broad classes of per fluorocarbon compounds) and the amounts present in the product or process a nd identifies a validated test method which can be used to quantify the specific c ompounds. [Removed test method as superfluous. If test method for determin ation of exempt compounds is needed, it can be determined under §(G)(4).] ( 23 ) Determination of Reid Vapor Pressure - Shall be d etermined by measuring the Reid Vapor pressure in accordance with Test Method for Vapor Pressure for Petroleum Products (Reid Method) , ASTM D 323-82 (April 8, 1987)

. ( 34 ) Control Device Efficiency - Determining the destr uction or removal efficiency of a control device shall be: (a) Ff or systems utilizing add-on control equipment, EPA Method 25 or 25A, as applicable and analysis of halogenated exempt compounds shall be by ARB Method 22

. [Additional test method from SJVUAPCD Rule 4625 §6.1.1.]464-8 MDAQMD Rule 464 Oil-Water Separators D1: 05/21/14 (b) Ff or incinerators or catalytic incinerators, EPA Meth od 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. (c) Where add-on control equipment is utilized, col lection efficiency shall be determined by EPA document “Model Regulatory Langua ge for Capture Efficiency Testing,” August 3, 1990. [Derived from SJVUAPCD Rule 4625 §6.1.2.] (4) Any applicable alternative test method may be u sed so long as such method has been approved by USEPA, CARB and the APCO. [Derived from AVAQMD Rule 1124 §(E)(3)(f). This provision allows the Distric t to use the most recent approved ASTM method and allows use of other offici al test methods if necessary.]

[SIP: See SIP Table at http://www.mdaqmd.ca.gov/Modules/ShowDocument.aspx? documentid=45 ] [SIP: Approved 9/27/95, 60 FR 49722, 40 CFR 52.220( c)(202)(i)(D)(1); Approved 9/8/78, 43 FR 40011, 40 CFR 52.220(c)(39)(iv)(C); Approved 6/1 4/78, 43 FR 25684, 40 CFR 52.220 (c)(32)(iv)(A)]