General Information Party ID Party Name Party Classification Mailing Address Work Phone Email/Website S443708 Gonsalves & Santucci Inc Privately-Owned Business 5141 Commercial Cl Concord, CA 94520 N/A N/A Related Places Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date S935710 Lands of Conco Properties Phase I and II Site Improvements Contra Costa 2 Facility Discharger 08/27/2025 null S916920 Nut Tree Business Park Warehouse Solano 5S Facility Discharger 10/17/2023 null S911117 2500A Bates Ave Contra Costa 2 Facility Discharger 02/17/2023 null S901217 Eubanks Drive Warehouse Solano 5S Facility Discharger 01/11/2022 null S901159 Eubanks Drive Warehouse Solano 5S Facility Discharger 01/07/2022 null S878327 Reliable Trucking Yolo 5S Facility Discharger 01/09/2020 null S875767 Conco Interim Stockpile Project Contra Costa 2 Facility Discharger 09/12/2019 null S852635 5129 Commercial Circle Contra Costa 2 Facility Discharger 01/23/2017 null S825680 Reliable Trucking Monterey 5S Facility Discharger 09/10/2013 null S721244 Conco Building G Contra Costa 2 Facility Discharger 07/02/2008 null S718429 2510 Dean Lesher Dr Contra Costa 2 Facility Discharger 05/30/2008 null Related Parties Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification N/A David Koffman Contact Owner Contact null null null N/A Darren Ratekin Contact Owner Contact null 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 S567027 Construction 5S 5S48C402571 Notice Of Intent New Application Active CONSTW 2009-0009-DWQ 11/20/2023 null Discharger 10/17/2023 null S589977 Construction 2 2 07C409090 Notice Of Intent New Application Active CONSTW 2009-0009-DWQ 09/03/2025 null Discharger 08/27/2025 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. S893884 09/02/2025 SW - Failure to Obtain Permit Failure to obtain coverage under the 2022 CGP by 09/01/2025. Violation N Internal Report Conco Interim Stockpile Project S512860 2009-0009-DWQ Y S897876 09/01/2025 SW - Late Report Failure to submit the 2024-2025 Annual Report by 09/01/2025 Violation N Report Nut Tree Business Park Warehouse S567027 2009-0009-DWQ Y Enforcement Actions Enforcement ID Enforcement Type Enf. Order No. Title Program Effective Date Status S462725 Notice of Violation null 5S48C402571 CONSTW 09/05/2025 Active S468910 1st Annual Report Notice of Non-Compliance null 5S48C402571 CONSTW 02/10/2026 Active S458733 Notice of Violation null 2 07C388497 CONSTW 09/05/2025 Active S415345 1st Annual Report Notice of Non-Compliance null 2 07C352505 CONSTW 01/29/2014 Historical S415343 1st Annual Report Notice of Non-Compliance null 2 07C352111 CONSTW 01/29/2014 Historical Regulatory Measures linked to Related Parties Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status