General Information Party ID Party Name Party Classification Mailing Address Work Phone Email/Website 37401 Ridgemont Development Company Privately-Owned Business 207 Fair Gate Drive Vacaville, CA 95687 null null Related Places Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date 236880 Leona Heights Sulfur Mine Alameda 2 Waste Pile Owner 03/18/1992 null Related Parties Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification 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 142347 WDR 2 2 019279001 WDR 92-105 for LEONA HEIGHTS QUARRY Active LNDISPOTH 92-105 08/19/1992 null Discharger 08/19/1992 null 142287 WDR 2 2 019279001 WDR 92-028 for RIDGEMONT DEVELOPMENT CO. Historical LNDISP 92-028 03/18/1992 null Discharger 03/18/1992 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 319609 Clean-up and Abatement Order R2-2003-0028 Enforcement- CAO R2-2003-0028 for Leon Heights Sulfur Mine LNDISP 02/21/2003 Active 243943 Clean-up and Abatement Order R2-2003-0028 Enforcement - 2 019279001 LNDISP 04/04/2003 Active 239620 13267 Letter UNKNOWN Enforcement - 2 019279001 LNDISP 03/18/2002 Historical 239619 13267 Letter UNKNOWN Enforcement - 2 019279001 LNDISP 03/18/2002 Historical 239618 13267 Letter UNKNOWN Enforcement - 2 019279001 LNDISP 03/18/2002 Historical 227517 13267 Letter UNKNOWN Enforcement - 2 019279001 LNDISP 10/29/1999 Historical 225405 Clean-up and Abatement Order R2-1998-0004 Enforcement - 2 019279001 LNDISP 01/30/1998 Active 222063 Clean-up and Abatement Order 98-004 Enforcement - CAO 98-004 for Leona Heights Sulfur Mine, 2 019279001 LNDISP 01/30/1998 Active Regulatory Measures linked to Related Parties Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status