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MS4 Permit Library
The MS4 Permit requires the posting of guiding documents:
- The current MS4 Permit is posted here.
- The current Stormwater Management Program (SWMP) is posted here.
Library documents relate to best management programs for:
- Illicit Discharge Detection and Elimination
- Regulation of Industrial and Commercial Facilities
- Construction Site Runoff Control
- Education and Outreach
- Public Involvement and Participation
- Post Construction Site Runoff
- Pollution Prevention for Municipal Operations
- Stormwater Management Facility Operation and Maintenance
- Hydromodification Assessments
- Stormwater Retrofit Strategies
- Water Quality Monitoring and Reporting
- Annual Reporting
Library Documents
2022-2026 MS4 Permit Updated 20252022 OLWS SWMP UPDATED for FY24Industrial/Commercial Stormwater Inspection Program (2023)Water Quality Monitoring.pdfErosion Prevention Manual (2020)Erosion Control Draft Checklist (2022)Surfacewater Draft Checklist (2022)Illicit Discharge Detection and Elimination Standard Operating Procedure (2023)Clackamas County Comprehensive Monitoring Plan (2022)Stormwater Implementation Guide (2013)Erosion Prevention and Planning and Design Manual.pdfHydromodification and Retrofit Strategy Update (2023)Hydromodification Report (2015)Surface Water Quality Facilities Technical Guidance Handbook.pdfStormwater Retrofit Strategy June 30 2015.pdfLiving With the American Beaver..pdfOLSD Macroinvertebrate Assessment Jan 2013.pdfZone Cleaning MapOutreach, Education and Public Involvement Framework (2022)MS4 Annual Report (2023-24)MS4 Annual Report (2022-23)MS4 Annual Report (2021-22)2022_Vegetated Stormwater Facility_Inspection SOP.pdf
