Seattle Public Utilities
CITY OF SEATTLE
2019 NPDES PHASE I MUNICIPAL STORMWATER PERMIT
STORMWATER MANAGEMENT PROGRAM
March 2019
CITY OF SEATTLE
2019 NPDES STORMWATER MA NAGEMENT PROGRAM
Seattle Public Utilities
On the Cover,
Capitol Hill Water Quality Project (Swale on Yale)
CITY OF SEATTLE
2019 NPDES STORMWATER MA NAGEMENT PROGRAM
Seattle Public Utilities
TABLE OF CONTENTS
TABLE OF CONTENTS ……………………………………………………………………………………………………………………………….. I
LIST OF FIGURES…………………………………………………………………………………………………………………………………….. III
LIST OF TABLES ………………………………………………………………………………………………………………………………………. III
I. INTRODUCTION……………………………………………………………………………………………………………………………………. I-1
I.1
Introduction …………………………………………………………………………………………………………………………………. I-1
I.1.1
Background ………………………………………………………………………………………………………………………. I-1
I.1.2
City of Seattle Drainage ……………………………………………………………………………………………………… I-2
II. NPDES STORMWATER MANAGEMENT PROGRAM ………………………………………………………………………………. II-6
II.1 Legal Authority-S5.C.1 ………………………………………………………………………………………………………………. II.1-1
II.1.1 Requirements ……………………………………………………………………………………………………………….. II.1-1
II.1.2 Program description ……………………………………………………………………………………………………….. II.1-1
II.1.3 Responsible City Departments ………………………………………………………………………………………… II.1-1
II.1.4 Completed Activities ………………………………………………………………………………………………………. II.1-2
II.1.5 Current and Planned Activities …………………………………………………………………………………………. II.1-2
II.2 Mapping-S5.C.2 ……………………………………………………………………………………………………………………….. II.2-1
II.2.1 Requirements ……………………………………………………………………………………………………………….. II.2-1
II.2.2 Ongoing Mapping Program ……………………………………………………………………………………………… II.2-1
II.2.3 Responsible City Departments ………………………………………………………………………………………… II.2-2
II.2.4 Current and Planned Mapping Activities ……………………………………………………………………………. II.2-2
II.3 Coordination-S5.C.3 …………………………………………………………………………………………………………………. II.3-1
II.3.1 Requirements ……………………………………………………………………………………………………………….. II.3-1
II.3.2 Coordination Program …………………………………………………………………………………………………….. II.3-1
II.3.3 Responsible City Departments ………………………………………………………………………………………… II.3-1
II.3.4 Current and Planned Coordination Activities ……………………………………………………………………… II.3-3
II.4 Public Participation During SWMP Development – S5.C.4…………………………………………………………….. II.4-1
II.4.1 Requirements ……………………………………………………………………………………………………………….. II.4-1
II.4.2 Public Participation Program ……………………………………………………………………………………………. II.4-1
II.4.3 Responsible City Departments ………………………………………………………………………………………… II.4-1
II.4.4 Current and Planned Public Participation Activities …………………………………………………………….. II.4-1
II.5 Controlling Runoff from New Development, Redevelopment and Construction Sites-S5.C.5 ……………. II.5-1
II.5.1 Requirements ……………………………………………………………………………………………………………….. II.5-1
II.5.2 Development Standards Program …………………………………………………………………………………….. II.5-1
II.5.3 Responsible City Departments ………………………………………………………………………………………… II.5-2
II.5.4 Current and Planned Activities …………………………………………………………………………………………. II.5-2
II.6 Structural SW Controls-S5C.6 ……………………………………………………………………………………………………. II.6-1
II.6.1 Requirements ……………………………………………………………………………………………………………….. II.6-1
II.6.2 Structural Stormwater Control Program …………………………………………………………………………….. II.6-1
City of Seattle 2019 NPDES Stormwater Management Program
Seattle Public Utilities
II.6.3 Responsible City Departments ………………………………………………………………………………………… II.6-1
II.6.4 Current and Planned Activities …………………………………………………………………………………………. II.6-1
II.7 Source Control Program for Existing Development-S5C.7 ……………………………………………………………. II.7-1
II.7.1 Requirements ……………………………………………………………………………………………………………….. II.7-1
II.7.2 Source Control Program …………………………………………………………………………………………………. II.7-1
II.7.3 Responsible City Departments ………………………………………………………………………………………… II.7-2
II.7.4 Current and Planned Activities …………………………………………………………………………………………. II.7-2
II.7.5 Training for Staff Involved in Source Control Program …………………………………………………………. II.7-5
II.8 Illicit Connections and Illicit Discharge Detection and Elimination Program-S5C.8 …………………………… II.8-1
II.8.1 Requirements ……………………………………………………………………………………………………………….. II.8-1
II.8.2 IDDE Program Elements …………………………………………………………………………………………………. II.8-2
II.8.3 Responsible City Departments ………………………………………………………………………………………… II.8-2
II.8.4 Current and Planned Activities …………………………………………………………………………………………. II.8-2
II.8.5 Field Screening ……………………………………………………………………………………………………………… II.8-6
II.8.6 Source Tracing ……………………………………………………………………………………………………………… II.8-8
II.9 Operation and Maintenance-S5C.9 …………………………………………………………………………………………….. II.9-1
II.9.1 Requirements ……………………………………………………………………………………………………………….. II.9-1
II.9.2 O&M Program ……………………………………………………………………………………………………………….. II.9-2
II.9.3 Responsible City Departments ………………………………………………………………………………………… II.9-2
II.9.4 Current and Planned Activities …………………………………………………………………………………………. II.9-2
II.10 Education and Outreach-S5C.10 ………………………………………………………………………………………………. II.10-1
II.10.1 Requirements ……………………………………………………………………………………………………………… II.10-1
II.10.2 Education and Outreach Program ………………………………………………………………………………….. II.10-1
II.10.3 Responsible City Departments ………………………………………………………………………………………. II.10-2
II.10.4 Current and Planned Activities ……………………………………………………………………………………….. II.10-2
III. REFERENCES…………………………………………………………………………………………………………………………………… III-1
IV. LIST OF DEFINITIONS AND ACRONYMS …………………………………………………………………………………………… IV-1
IV.1 Definitions and Acronyms …………………………………………………………………………………………………………… IV-2
APPENDIX 1 ……………………………………………………………………………………………………………………………………………… 1
Mayor’s Executive Order ………………………………………………………………………………………………………………………… 1
City of Seattle 2019 NPDES Stormwater Management Program
Seattle Public Utilities
iii
LIST OF FIGURES
Figure I.1-1 Map of City Drainage Systems …………………………………………………………………………………………….. I-4
Figure I.1-2 Diagrams of Combined, Partially Separated and Separated Sewer Systems ……………………………… I-5
Figure II.1-1 Timeline Showing Progress and Next Steps ……………………………………………………………………… II.1-3
Figure II.2-1 Timeline Showing Progress and Next Steps ……………………………………………………………………… II.2-3
Figure II.3-1 City Organizational Chart ……………………………………………………………………………………………….. II.3-2
Figure II.3-2 Timeline Showing Progress and Next Steps ……………………………………………………………………… II.3-4
Figure II.4-1 Timeline Showing Progress and Next Steps ……………………………………………………………………… II.4-2
Figure II.5-1 Timeline Showing Progress and Next Steps ……………………………………………………………………… II.5-6
Figure II.6-1 Major Receiving Water Bodies ………………………………………………………………………………………… II.6-2
Figure II.6-2 Artist depiction of Capitol Hill Water Quality Project ……………………………………………………………. II.6-5
Figure II.6-3 Street Views of Capitol Hill Water Quality Project ………………………………………………………………. II.6-6
Figure II.6-3 Street View of Venema Natural Drainage System Project …………………………………………………… II.6-7
Figure II.6-3 Street Sweeper ……………………………………………………………………….. Error! Bookmark not defined.
Figure II.7-1 Audit Process ……………………………………………………………………………………………………………….. II.7-3
Figure II.7-2 Stormwater Compliance Inspection Process……………………………………………………………………… II.7-3
Figure II.7-3 Enforcement Process …………………………………………………………………………………………………….. II.7-4
Figure II.7-4 Timeline Showing Progress and Next Steps ……………………………………………………………………… II.7-5
Figure II.8-1 IDDE Field Screening Flow Chart ……………………………………………………………………………………. II.8-7
Figure II.8-2 Timeline Showing Progress and Next Steps ……………………………………………………………………… II.8-9
Figure II.9-1 Timeline Showing Progress and Next Steps ……………………………………………………………………… II.9-7
Figure II.10-1 Timeline Showing Progress and Next Steps ………………………………………………………………….. II.10-9
LIST OF TABLES
Table II.1-I Components of the Stormwater Code and Directors’ Rules …………………………………………………… II.1-2
Table II.6-I Structural Stormwater Control Project List ………………………………………………………………………….. II.6-4
Table II.8-I IDDE Screening Parameters …………………………………………………………………………………………….. II.8-6
Table II.10-I Education and Outreach Activities …………………………………………………………………………………. II.10-3
Table IV.1-I Definitions ……………………………………………………………………………………………………………………… IV-2
Table IV.1-II Acronyms ……………………………………………………………………………………………………………………… IV-5
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CITY OF SEATTLE NPDES STORMWATER MANAGEMENT
PROGRAM
Prepared in compliance with the 2013 Phase I Municipal Stormwater National
Pollutant Discharge Elimination System and State Discharge General Permit
for discharges from Large and…