SJVUAPCD 12/15/11 4625 - 1 RULE 4625 WASTEWATER SEPARATORS (Adopt ed April 11, 1991; Amended May 21, 1992; Amended December 17, 1992; Amended December 15, 2011)

1.0 Purpose

The purpose of this rule is to limit VOC emissions from wastewater separators by requiring vapor loss control devices, recordk eeping, inspection and test methods.

2.0 Applicability

This rule applies to wastewat er separators including air flota tion units as defined in this rule. The requirements of this rule only apply to the sepa ration of crude oil and water after custody transfer.

3.0 Definitions

3.1 Air flotation unit: equipment used to remove suspended matter, both oil and solid, from water by dissolving air under pr essure and then re leasing the air at atmospheric pressure in a tank or basin.

3.2 APCO: the Air Pollution Control Officer of the San Joaquin Valley Unified Air Pollution Control District, or any person au thorized to act on behalf of the APCO.

3.3 ARB: California Air Resour ces Board as estab lished by the California Health and Safety Code Section 39510, or any person au thorized to act on its behalf.

3.4 Custody transfer: the physical and contractual owne rship transfer of produced fluids from an oil produ cer to another entity.

3.5 District: San Joaq uin Valley Unified Air Po llution Control District.

3.6 EPA: United St ates Environmental Protection Agency.

3.7 Operator: includes but is not lim ited to any person who owns, leases, supervises, or operates a fa cility and/or equipment.

3.8 Volatile Organic Compound (VOC): as defined in Rule 1020 (Definitions).

3.9 Wastewater Separator: any device or piece of equipmen t that is used to remove oil and associated chemicals from water, or any device, such as a flocculation tank, clarifier, etc. that remove s petroleum-derived compounds from

wastewater.SJVUAPCD 12/15/11 4625 - 2 3.10 Wastewater Separator Forbay: th at section of a gravity-type wastewater separator which receives the untreated, o il-water waste from the preseparator flume; and acts as a head er which distributes the in fluent to the separator

channels.

4.0 [Reserved]

5.0 Requirements

5.1 A person shall not use any compartmen t of any vessel or device operated for the recovery of oil or tar from effluent water, from any equipment which processes, refines, stores or handles petroleu m or coal tar products unless such compartments are equipped with one of th e following vapor loss control devices, except when gauging or sa mpling is taking place:

5.1.1 A solid cover with all openings sealed and to tally enclosing the liquid contents of the compartment, except for such breathing vents as are structurally necessary; or

5.1.2 A floating pontoon or double-deck type cove r, equipped with closure

seals that have no holes or tears, installed and maintained so that gaps between the compartment wall and seal shall not exceed one-eighth inch for an accumulative length of 97 per cent of the perimeter of the tank,

and shall not exceed one -half inch for an accu mulative length of the remaining three percent of the perime ter of the tank. No gap between the compartment wall a nd the seal shall exc eed one-half inch; or

5.1.3 A vapor recovery system w ith a combined colle ction and control efficiency of at least 95 percent by weight.

5.2 Any gauging and sampli ng device in the compartmen t cover shall be equipped

with a cover or lid. The cover shall be in a closed position at all times, except

when the device is in actual use.

5.3 All wastewater separato r forbays shall be covered.

5.4 Skimmed oil or tar rem oved from wastewater separati ng devices shall be either charged to process units with feed or transferred to a container with a control system with at least 90 percent control efficiency by weight . A control device must be under District permit.SJVUAPCD 12/15/11 4625 - 3 5.5 Inspection

On and after January 1, 2013:

5.5.1 An operator complying with Section 5.1.1 shall v isually inspect, the manholes, roof hatches, or other openings on the fixed roof, at least once every 12 months after the tank is initia lly filled with an organic liquid. No holes, tears, or other openings are allowed that would permit the escape of hydrocarbon va pors. Any defects found ar e violations of this

rule.

5.5.2 An operator complying with Sect ion 5.1.2 shall visually inspect, the internal floating roof a nd its appurtenant parts, fittings, etc., and the primary seal and/or secondary seal at least once every 12 months after the tank is initially filled with an organic liquid. Other than the gap criteria specified by this rule, no hol es, tears, or other openings are allowed that would permit the escap e of hydrocarbon vapors. Any

defects found are violat ions of this rule.

5.5.3 An operator complying with Sec tion 5.1.3 shall visually inspect the manholes, roof hatches, ot her openings, fittings, et c., at least once every 12 months after the tank is initially f illed with an organic liquid. No holes, tears, or other openings are a llowed that would permit the escape of hydrocarbon vapors. Any defects f ound are violations of this rule.

6.0 Administrati ve Requirements

6.1 Test Methods

Compliance with the requiremen ts of Section 5.0 shall be determined in accordance with the following test methods or their equivalents as approved by the EPA and the

APCO:

6.1.1 Efficiency of VOC control de vice shall be determined by EPA Test Method 25 and analysis of halogenated exempt compounds shall be by

ARB Method 422.

6.1.2 Where add-on control equipment is utilized, collection ef ficiency shall be determined by the EPA document "Model Regulator y Language for Capture Efficiency Tes ting," August 3, 1990.SJVUAPCD 12/15/11 4625 - 4 6.2 Recordkeeping

Any operator subject to Sec tion 5.0 of this rule shall:

6.2.1 Maintain records of the type a nd location of each wast ewater separator.

6.2.2 Record the date of insp ections pursuant to Section 5.5.

6.2.3 Maintain required records for at least five years and made available to the APCO, ARB, and EPA upon request.