CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM – Page 1

(Electronic Format)

I. GENERAL INFORMATION

District: Mojave Desert Air Quality Management District

Rule No(s): 464 Date adopted/Amended/Rescinded: Amended June 23, 2014

Rule Title(s): Oil-Water Separators

Date Submitted to ARB: August 26, 2014

If an Amended Rule, Date Last Amended (or Adopted): Last amended August 24, 1994

Is the Rule Intended to be Sent to the U.S. EPA as a SIP Revision? Yes No (If No, do not complete remainder of form)

District Contact: Tracy M Walters Phone Number: (760) 245-1661 x6122 E-mail Address: twalters@mdaqmd.ca.gov

Narrative Summary of New Rule or Rule Changes: New Rule Amended Rule

Rule 464 was amended to satisfy 42 U.S.C. §§7511a (Federal Clean Air Act §182) which requires ozone 

nonattainment areas implement RACT for sources subject to CTGs and for major sources of ozone precursers. 

The MDAQMD has an oil-water separator rule which was approved as RACT into the SIP in 1995 (60 FR 49772). 

This rule is subject to the CTG titled Control of Refinery Vacuum Producing Systems, Wastewater Separators and 

Process Unit Turnarounds (EPA-450/2-77-025 October, 1977). While this CTG specifically states applicability to 

petroleum refinery sources, the current rule does not specify the refinery industry, but applies instead to similar 

equipment. Although the refinery industry is nonexistent in the MDAQMD, Rule 464 has been incorporated in the 

SIP with applicability for the type of oil-water separators that exist in the District. The proposed amendments 

update rule applicability, definitions, floating cover seal tolerances, control device efficiency, storage of skimmed 

oil and tar, recordkeeping, and test methods. 

Pollutant(s) Regulated by the Rule (Check): ROG (NOx) SO2

(CO) PM TAC (name):

II. EFFECT ON EMISSIONS

Complete this section ONLY for rules that, when implemented, will result in quantifiable changes in emissions. Attach reference(s) for emission factor(s) 

and other information. Attach calculation sheet showing how the emission information provided below was determined.

Net Effect on Emissions: Increase Decrease N/A

Emission Reduction Commitment in SIP for this Source Category: N/A

Inventory Year Used to Calculate Changes in Emissions: N/A Area Affected: N/A

Future Year Control Profile Estimate (Provide information on as many years as possible):

N/A
CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM - Page 2

(Electronic Format)

Baseline Inventory in the SIP for the Control Measure: N/A

Emissions Reduction Commitment in the SIP for the Control Measure: N/A

Revised Baseline Inventory (if any): N/A

Revised Emission Reduction Estimate (if developed): N/A

Note that the district’s input to the Rule Evaluation Form will not be used as input to the ARB’s emission forecasting and 

planning.

III. SOURCES/ATTAINMENT STATUS

District is: Attainment Nonattainment Split

Approximate Total Number of Small (<100 TPY) Sources Affected by this Amendment: None. 

Percent in Nonattainment Area: 0%

Number of Large (> 100 TPY) Sources Controlled: None Percent in Nonattainment Area: 0%

Name(s) and Location(s) (city and county) of Large (> 100 TPY) Sources Controlled by Rule (Attach additional sheets as 

necessary): N/A

IV. EMISSION REDUCTION TECHNOLOGY

Does the Rule Include Emission Limits that are Continuous? Yes No

If Yes, Those Limits are in Section(s) N/A of the Rule.

Other Methods in the Rule for Achieving Emission Reductions are: Fugitive vapor control devices, monitoring.

V. OTHER REQUIREMENTS

The Rule Contains:

Emission Limits in Section(s): N/A Work Practice Standards in Section(s): (C), (E)

Recordkeeping Requirements in Section(s): (F) Reporting Requirements in Section(s): N/A
CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM - Page 3

(Electronic Format)

VI. IMPACT ON AIR QUALITY PLAN

 No Impact Impacts RFP Impacts attainment

Discussion: There are no potential adverse environmental impacts of compliance with the adoption of Rule 464. Rule 

464 will impose additional controls on VOCs, seal tolerances, and control device efficiency.

5/1/2002