General Information Party ID Party Name Party Classification Mailing Address Work Phone Email/Website 20332 Highpointe Communities Privately-Owned Business 16501 Scientific Way Irvine, CA 92618 949-472-0800(+) ross.yamaguchi@highpointeinc.com Related Places Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date 883108 Emerald Ridge Tract 36947 Residential Project Riverside 8 Dredge/Fill Site Owner 09/01/2022 null 266100 Tract No. 31269-2 (Phase 2) Riverside 8 Dredge/Fill Site None null null 214776 Clayton Ranch TT#29607 null 9 Dredge/Fill Site Owner 05/23/2003 null 219579 Denha Residential Development null 9 Dredge/Fill Site Owner 05/13/2004 null 266116 Tract No. 31424 Riverside 8 Dredge/Fill Site Owner 05/27/2005 null 893435 Sunset Crossing TTM 38442 Riverside 8 Dredge/Fill Site Owner 02/13/2024 null 896714 Sunset Crossings TTM 38443 Riverside 8 Dredge/Fill Site Owner 09/30/2024 null 718779 Quincy Channel Modification Riverside 8 Dredge/Fill Site None null null Related Parties Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification 634360 Ross Yamaguchi Person Legally Responsible Official 09/01/2022 null null 84420 Steve Ludwig Person Employee 07/07/2010 null 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 458599 WDR 8 332024-18 WDR R8-2025-0007 for Highpointe Communities Active CERFILLEXC R8-2025-0007 02/14/2025 null Discharger 09/30/2024 null 455816 WDR 8 332024-02 R8-2025-0008 Sunset Crossing TTM 38442 Active CERFILLEXC R8-2025-0008 02/14/2025 null Discharger 02/13/2024 null 449098 401 Certification 8 332022-13 401 Cert for Highpointe Communities Active CERFILLEXC null 02/27/2023 null Discharger 09/01/2022 null 261423 WDR 8 8 332777001 WDR R8-2005-0087 for Highpoint Communities, Quincy Channel Historical CERFILLEXC R8-2005-0087 05/27/2005 11/21/2008 Discharger 05/27/2005 null 214298 401 Certification 9 9 000001269 9 000001269 Historical CERFILLEXC null 05/13/2004 null Discharger 09/01/2005 null 214192 401 Certification 9 9 000001141 9 000001141 Historical CERFILLEXC null 05/23/2003 06/10/2003 Discharger 09/01/2005 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 Regulatory Measures linked to Related Parties Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status