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California Integrated Water Quality System Project (CIWQS)
   Facility At-A-Glance Report

  
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Place ID 241610 		  
  
  
  
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General Information
Region Place ID Place Name Place Type Place Address Place County
6B 241610 Mountain Pass Mine & Mill Ops Metal Mining 67750 Bailey Rd Mountain Pass, CA, 92366 San Bernardino
Expand/Contract Related Parties
Related Parties
Party Party Type Party Name Role Classification Relationship Start Date Relationship End Date
487446 Organization MP Mine Operations LLC Owner Privately-Owned Business 07/12/2017
605017 Person John F. Espinoza Contact 07/12/2017
563163 Person Shelby Barker Case Worker 07/01/2017
139322 Person Christy Hunter Case Worker 10/09/2007 06/30/2017
399199 Organization Chevron Mining Inc R6 Owner Privately-Owned Business 09/10/2007 04/14/2009
29096 Organization Molycorp Inc Owner Privately-Owned Business 09/17/1981 09/09/2007
Total Related Parties: 6
Expand/Contract Regulatory Measures
Regulatory Measures
Reg Measure ID Reg Measure Type Region Program Order No. WDID Effective Date Expiration Date Status Amended?
160533 Unregulated 6V NPDMINING 6B362098001 Historical N
377626 WDR 6V LNDISPOTH R6V-2010-0047 6B362098001 10/14/2010 10/14/2025 Active N
145895 WDR 6V LNDISP 91-836 6B362098001 06/13/1991 06/13/2015 Historical N
147928 WDR 6V LNDISP 81-073 6B362098001 09/17/1981 07/01/1989 Historical N
Total Reg Measures: 4
Expand/Contract Violations
Violations
Violation ID Occurred Date Violation Type (-) Violation Description Corrective Action Status Classification Source
1144261 03/17/2025 UAUTHDISC 325 gallons of sodium hydroxide spilled. Release was stopped for line repair. On site personnel and equipment including vacuum truck cleaned up solution, impacted soil removed. A line carrying 32% sodium hydroxide ruptured and impacted the ground. The line was turned off, while repairs were being made. The spill was contained and vacuumed up onsite, impacted soil was remediated. ECM Doc handle # 11563968 Violation B Report
1144258 09/06/2024 UAUTHDISC Cal-OES 24-5040 Line failure caused 32% sodium hydroxide spill onto ground. MPMO staff called Lahontan on Friday for clean up input. Material being pumped into sump and neutralized with weak acid until neutral pH achieved.Reporting party stated that there was a line failure from a line that leads to a tank causing the release onto the ground. The release has been stopped and contained. No storms drains or waterways impacted Violation B Report
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
Total Violations: 2 Priority Violations: 0
*Click the "(+/-) Violation Description" link to expand and contract the violation description.
*As of 5/20/2010, the Water Board's Enforcement Policy requires that all violations be classified as 1, 2 or 3, with class 1 being the highest. Prior to this, violations were simply classified as Yes or No. If a 123 classification has been assigned to a violation that occurred before this date, that classification data will be displayed instead of the Yes/No data.
Violation Types
UAUTHDISC = Unauthorized Discharge
Expand/Contract Enforcement Actions
Enforcement Actions
Enf Id Enf Type Enf Order No. Effective Date Status
428308 Oral Communication 01/03/2019 Historical
423519 Oral Communication 08/14/2018 Historical
423514 Oral Communication 08/14/2018 Historical
423561 Oral Communication 07/23/2018 Historical
402399 Oral Communication null 07/29/2015 Historical
401788 Oral Communication null 06/29/2015 Historical
399866 Oral Communication 01/28/2015 Historical
397425 Clean-up and Abatement Order R6V-2014-0062 07/22/2014 Active
397332 Oral Communication 07/09/2014 Historical
397331 Oral Communication 07/03/2014 Historical
397308 Oral Communication 06/09/2014 Historical
397002 Oral Communication 06/09/2014 Historical
396143 Oral Communication 05/05/2014 Historical
395610 Oral Communication 04/04/2014 Historical
393507 Notice of Violation null 10/10/2013 Active
396973 Oral Communication 09/20/2013 Historical
392999 Staff Enforcement Letter 08/08/2013 Historical
390181 Oral Communication 04/11/2013 Historical
390179 Oral Communication 03/08/2013 Historical
389493 Oral Communication 03/05/2013 Historical
390178 Oral Communication null 02/28/2013 Historical
388942 Notice of Violation null 01/29/2013 Historical
390177 Oral Communication null 01/16/2013 Historical
388247 Oral Communication 11/27/2012 Historical
388275 Notice of Violation 11/20/2012 Active
388134 Oral Communication 11/06/2012 Historical
389534 Oral Communication 09/24/2012 Historical
389533 Oral Communication 09/14/2012 Historical
387562 Oral Communication 09/12/2012 Historical
387074 Notice of Violation null 06/08/2012 Active
380390 Staff Enforcement Letter null 07/20/2011 Historical
352256 Notice of Violation 10/24/2007 Historical
239197 Oral Communication 12/10/2001 Historical
244909 Clean-up and Abatement Order 6-98-19A1 03/08/2001 Active
244524 Staff Enforcement Letter 09/18/2000 Historical
243264 Settlement - Court Order 07/09/1998 Historical
223040 Clean-up and Abatement Order R6V-1998-0019 03/25/1998 Active
243734 Clean-up and Abatement Order 6-98-019 03/25/1998 Active
223044 Admin Civil Liability R6V-1998-0007 03/04/1998 Historical
219137 Cease and Desist Order 89-03602 02/09/1989 Historical
219357 Cease and Desist Order 86-101 08/14/1986 Historical
219358 Time Schedule Order 85-116 10/03/1985 Historical
Total Enf Actions: 42
Expand/Contract Inspections
Inspections
Inspection ID Inspection Type Lead Inspector Actual End Date Planned Violations Attachment
60590203 B Type compliance inspection Andrew Robinson 04/30/2025 N 0 N/A
59935644 B Type compliance inspection Andrew Robinson 01/31/2025 N 0 N/A
53851294 B Type compliance inspection Andrew Robinson 11/16/2023 N 0 N/A
51321986 Field Oversight Christina Guerra 04/17/2023 N 0 Download
51311564 B Type compliance inspection Christina Guerra 04/17/2023 N 0 Download
51323383 Field Oversight Christina Guerra 04/17/2023 N 0 Download
45231895 B Type compliance inspection Shelby Barker 08/31/2021 N 0 Download
37526881 B Type compliance inspection Shelby Barker 09/03/2019 N 0 N/A
36597413 B Type compliance inspection Shelby Barker 05/29/2019 N 0 N/A
34653669 B Type compliance inspection Shelby Barker 11/28/2018 N 0 N/A
31919597 B Type compliance inspection Shelby Barker 02/21/2018 N 0 Download
26702613 B Type compliance inspection Christy Hunter 12/07/2016 N 0 Download
26702379 B Type compliance inspection Christy Hunter 12/07/2016 N 0 [Attachments]
21296956 B Type compliance inspection Christy Hunter 07/28/2015 N 0 [Attachments]
18208104 B Type compliance inspection Christy Hunter 10/28/2014 N 1 Download
16595437 B Type compliance inspection Christy Hunter 06/04/2014 N 1 [Attachments]
13474553 B Type compliance inspection Christy Hunter 08/15/2013 N 0 Download
11177313 Follow-up inspection (noncompliance) Christy Hunter 08/07/2012 N 0 N/A
11177274 B Type compliance inspection Christy Hunter 08/02/2012 N 0 Download
8355698 Field Oversight Christy Hunter 05/18/2012 N 0 Download
6768207 Field Oversight Christy Hunter 11/15/2011 N 0 N/A
5782295 B Type compliance inspection Christy Hunter 09/27/2011 N 0 Download
3329287 B Type compliance inspection Christy Hunter 12/16/2010 N 0 Download
2333431 B Type compliance inspection Jan Zimmerman 05/19/2010 Y 0 N/A
2362835 B Type compliance inspection Christy Hunter 05/19/2010 N 0 Download
1966251 B Type compliance inspection Christy Hunter 12/14/2009 N 0 N/A
1503951 B Type compliance inspection Christy Hunter 10/16/2008 N 0 Download
1206240 B Type compliance inspection Christy Hunter 10/04/2007 N 0 Download
793279 B Type compliance inspection Christy Hunter 09/26/2006 N 0 N/A
336701 B Type compliance inspection Christy Hunter 10/18/2004 Y 0 N/A
334041 B Type compliance inspection Christy Hunter 02/18/2004 Y 0 N/A
330341 B Type compliance inspection Curt Shifrer 05/29/2003 Y 0 N/A
296146 B Type compliance inspection Curt Shifrer 10/03/2001 Y 0 N/A
296147 B Type compliance inspection Curt Shifrer 04/19/2001 Y 0 N/A
296145 A Type compliance inspection Curt Shifrer 04/04/2000 Y 0 N/A
296144 A Type compliance inspection Tim Post 09/15/1999 Y 0 N/A
296148 Miscellaneous inspection Curt Shifrer 03/30/1999 Y 0 N/A
296167 A Type compliance inspection Curt Shifrer 01/20/1999 Y 0 N/A
296168 B Type compliance inspection Curt Shifrer 10/06/1998 Y 0 N/A
296165 Miscellaneous inspection Curt Shifrer 12/17/1997 Y 0 N/A
296164 B Type compliance inspection Curt Shifrer 05/22/1996 Y 0 N/A
296163 B Type compliance inspection Curt Shifrer 05/31/1995 Y 0 N/A
296166 B Type compliance inspection Curt Shifrer 08/17/1994 Y 0 N/A
296162 B Type compliance inspection Curt Shifrer 06/17/1994 Y 0 N/A
296161 Prerequirement inspection Curt Shifrer 04/12/1994 Y 0 N/A
Total Inspections: 45 Last Inspection: 04/30/2025
  
The current report was generated with data as of: 07/01/2025
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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