Public Notice: ASARCO LLC Mission Complex - San Xavier; Proposed Title V Federal Operating Permit Renewal

Publish Date: 05/25/2017


The Region 9 office of the United States Environmental Protection Agency (EPA) requests public comment on a proposed Operating Permit renewal for ASARCO LLC Mission Complex – San Xavier, a facility that mines and processes copper sulfide ore, located on the reservation of the Tohono O’odham Nation in Sahuarita, Arizona.

This facility is required to renew its Clean Air Act Title V Operating Permit in accordance with 40 CFR Part 71.  The permit contains all the Clean Air Act requirements that apply to the source and requires that the source conduct monitoring sufficient to enable US EPA and the public to determine whether the source is complying with the applicable air quality requirements.  This proceeding is subject to the administrative requirements of 40 CFR 71.11.

A copy of the proposed permit prepared by EPA, the statement of basis for the proposed permit, the application, and all supporting materials submitted by the source are available for review by the public at the following locations:

  1. By contacting the permit writer, Khoi Nguyen (, at 415-947-4120, or by writing to:
    US EPA, Region 9
    Attn: Khoi Nguyen (AIR-3)
    75 Hawthorne Street
    San Francisco, CA  94105
  2. At the US EPA Region 9 office (address above), Monday through Friday, from 9:00 a.m. until 4:00 p.m., excluding federal holidays
  3. Online at Title V Permits Issued by Region 9
  4. Online at under Docket ID No. EPA-R09-OAR-2017-0252

Pursuant to 40 CFR § 71.11(f), EPA shall hold a Public Hearing if the Regional Administrator finds, on the basis of requests, a significant amount of public interest in a proposed permit. Any person may request a public hearing during the public comment period. Requests for a Public Hearing must contain the reasons for requesting a hearing. If a Public Hearing is granted, a public notice stating the date, time and place of the hearing will be made at least 30 days prior to the hearing and the comment period will be extended through the hearing date.

If you would like to be added to the mailing list for updates on a particular facility or for updates on EPA’s Title V Operating Permit program, please contact EPA at the address listed above, visit Region 9's Public Notice Distribution List for CAA Permits or send an email to

All comments that are received via email or through will be included in the public docket without change and will be available to the public, including any personal information provided, within a few days of receipt.

Comments submitted to the EPA through U.S. Mail or other another non-electronic delivery method will also be included in the public docket without change and will be available to the public, including any personal information provided, unless the comment includes Confidential Business Information (CBI) or other information the disclosure of which is restricted by statute. Information that is considered to be CBI or otherwise protected should be clearly identified as such and should be submitted only through U.S. Mail or a non-electronic delivery method; such information should not be submitted through or e-mail. If a commenter sends e-mail directly to the EPA, the e-mail address will be automatically captured and included as part of the public comment. Please note that an e-mail or postal address must be provided with comments if the commenter wishes to receive direct notification of the EPA’s final decision regarding the proposed permit following the public comment period.

***Please bring the foregoing notice to the attention of all persons who would be interested in this matter.***

Applicant or Respondent

ASARCO LLC Mission Complex – San Xavier

Docket Number: 

Permit #: TO-ROP 15-01