General Information Party ID Party Name Party Classification Mailing Address Work Phone Email/Website 48117 US Borax Inc Privately-Owned Business 14486 Borax Road Boron, CA 93516 760-762-7222(+) richard.cohen@riotinto.com Related Places Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date 857400 Lang Mine Los Angeles 4 Salt Mining Owner and Operator 04/02/2019 null 246358 Owens Lake Trona Processing Inyo 6B Salt Mining Owner 01/22/2003 null 226707 Gangue/Overburden/Ref Waste Kern 6B Salt Mining Owner 11/28/1994 null 210080 Boron Mine Facility Kern 6B Salt Mining Owner 06/24/1976 null Related Parties Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification 605985 Richard Cohen Person Legally Responsible Official 01/21/2020 null null 596367 Nathan Francis Person Legally Responsible Official 04/02/2019 01/21/2020 null Regulatory Measures(non-enforcement) Reg. Measure ID Regulatory Measure Type Region WDID Title Status Program Order No. RM Effective Date RM Termination Date Relationship Relationship Start Date Relationship End Date 429730 13267 Letter (Non-Enforcement) 4 null 13267 Letter (Non-Enforcement) R4-2019-0012 for U.S. Borax Historical LFNONOPER R4-2019-0012 03/29/2019 07/21/2020 Discharger 04/02/2019 null 403003 WDR 6V 6B152004001 WDR R6V-2015-0057 for US Borax Inc Active LNDISPOTH R6V-2015-0057 09/17/2015 null Discharger 09/17/2015 null 376452 WDR 6V 6B152004002 Revision for US Borax Inc Active LNDISPOTH R6V-2010-0048 10/14/2010 null Discharger 04/13/1989 null 306715 WDR 6V 6B152004001 WDR R6V-2006-0025 for US BORAX INC Historical LNDISPOTH R6V-2006-0025 06/14/2006 09/17/2015 Discharger 04/11/2001 null 148008 WDR 6V 6B152004001 WDR 01-019 for US BORAX INC Historical LNDISP 01-019 04/11/2001 04/11/2006 Discharger 04/11/2001 null 147899 WDR 6V 6B152004001 WDR 80-025 for US BORAX INC Historical LNDISP 80-025 03/13/1980 null Discharger 03/13/1980 null 147882 WDR 6V 6B152004001 WDR 78-075 for US BORAX INC Historical LNDISP 78-075 12/07/1978 null Discharger 12/07/1978 null 147859 WDR 6V 6B152004001 WDR 76-070 for US BORAX INC Historical LNDISP 76-070 06/24/1976 null Discharger 06/24/1976 null 147194 WDR 6V 6B152004001 WDR 84-014 for US BORAX INC Historical LNDISP 84-014 01/12/1984 null Discharger 01/12/1984 null 147168 WDR 6V 6B152004001 WDR 90-037 for US BORAX INC Historical LNDISP 90-037 05/10/1990 null Discharger 05/10/1990 null 146444 WDR 6V 6B152004001 WDR 89-078 for US BORAX INC Historical LNDISP 89-078 04/13/1989 null Discharger 04/13/1989 null 146443 WDR 6V 6B152004002 WDR 89-059 for US BORAX INC Historical LNDISP 89-059 04/13/1989 10/14/2010 Discharger 04/13/1989 null 146150 WDR 6V 6B152004001 WDR 93-017 for US BORAX INC Historical LNDISP 93-017 03/11/1993 04/10/2001 Discharger 03/11/1993 null 132919 WDR 6V 6B140202001 US BORAX Active LNDISPOTH 04-035 09/09/2004 null Discharger 09/09/2004 null Violations within the past calendar year Violation ID Occurrence Date Violation Type Violation Description Violation Status Priority Source Facility Name Violated Reg. Meas. ID Violated Reg. Meas. Order No. Linked To Enf. Enforcement Actions Enforcement ID Enforcement Type Enf. Order No. Title Program Effective Date Status 252162 Staff Enforcement Letter UNKNOWN Enforcement - 6B152004001 LNDISP 08/02/2004 Historical 394166 Staff Enforcement Letter null SEL 11/26/2013 for US Borax Inc LNDISP 11/26/2013 Historical 449819 Oral Communication null Oral Com 11/08/2022 for US Borax Inc LNDISPOTH 05/25/2022 Historical 248961 Oral Communication UNKNOWN Enforcement - 6B152004002 LNDISP 07/01/2002 Historical 248691 Oral Communication UNKNOWN Enforcement - 6B152004001 TPCA 08/27/2002 Historical 235356 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 07/10/2001 Historical 397542 Oral Communication null Oral Com 12/11/2013 for EIF Mojave, LLC LNDISP 12/11/2013 Historical 452351 Oral Communication null Oral Com 04/20/2023 for US Borax Inc LNDISPOTH 04/20/2023 Active 243819 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 03/20/2000 Historical 244384 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 09/28/2000 Historical 238820 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 12/27/2001 Historical 241177 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 03/18/2002 Historical 245548 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 11/04/2002 Historical 234683 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 03/28/2001 Historical 243824 Oral Communication UNKNOWN Enforcement - 6B152004002 LNDISP 04/20/2000 Historical 238716 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 10/22/2001 Historical 395155 Oral Communication null Oral Com 12/11/2013 for EIF Mojave, LLC LNDISP 12/11/2013 Historical 244391 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 11/08/2000 Historical 244341 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 09/24/2000 Historical 244126 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 06/22/2000 Historical 244032 Notice to Comply UNKNOWN Enforcement - 6B152004001 LNDISP 06/06/2000 Historical 243775 Notice of Violation UNKNOWN Enforcement - 6B152004001 LNDISP 03/06/2000 Historical 244388 Notice of Violation UNKNOWN Enforcement - 6B152004001 LNDISP 10/13/2000 Historical 449592 Notice of Violation null NOV 03/30/2022 for US Borax Inc LNDISPOTH 03/30/2022 Historical 441057 Notice of Violation null NOV 10/20/2020 for US Borax Inc LNDISPOTH 10/20/2020 Historical 377136 Notice of Violation R6V-2006-0025 NOV - RIO TINTO MINERALS (12/24/2010) LNDISP 12/24/2010 Active 371430 Notice of Violation R6V-2006-0025 NOV - RIO TINTO MINERALS (09/14/2009) LNDISP 09/14/2009 Active 441506 Notice of Violation null NOV 12/03/2020 for US Borax Inc LNDISPOTH 12/03/2020 Active 356611 Notice of Violation R6V-2006-0025 Notice of Violation for US Borax Inc LNDISP 04/14/2008 Historical 441069 Notice of Violation null NOV 09/11/2017 for US Borax Inc LNDISPOTH 09/11/2017 Historical 219702 Clean-up and Abatement Order 85-016 Enforcement - 6B152004001 LNDISP 12/31/1985 Historical 219576 Clean-up and Abatement Order 90-03701 Enforcement - 6B152004001 LNDISP 05/10/1990 Historical 223144 Admin Civil Liability R6V-1998-0022 Enforcement - 6B152004001 LNDISP 04/16/1998 Historical 455401 13267 Letter null 13267 Letter 12/04/2023 for US Borax Inc LNDISPOTH 12/04/2023 Active Regulatory Measures linked to Related Parties Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status