New Development

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Post Construction Stormwater Controls
Reduce Pollutants from New Development

What's New? 

1)      C.3 Stormwater Technical Guidance, Version 5.0 (June 2016)

2)      C.3 New Development Flyer (August 2016)

3)      Hydromodification Management Flyer (August 2016)

4)      Notice to Applicants Factsheet (August 2016)

5)      Road Project Requirements Factsheet (August 2016)

6)      Biotreatment Soil Mix Verification Checklist (May 2016)

7)      BASMAA Regional Biotreatment Soil Specification 2016 (April 2016)



 

Urban development is a major contributor to stormwater-caused pollution. Development or redevelopment of property represents an opportunity to incorporate post-construction controls that can reduce water quality impacts over the life of the project. This page provides resources to help project applicants include post-construction stormwater controls in development project designs. These resources are organized in the following sections:

 

 



C.3 Stormwater Technical Guidance

 C.3 Stormwater Technical Guidance, Version 5.0 Handbook (revised in June 2016)

This handbook was designed to help developers, builders, and project sponsors include post-construction stormwater controls in their projects, in order to meet local municipal requirements that reduce the long term impacts of development on stormwater quality and creek channels.

This handbook can be downloaded above as a complete document or by chapters and appendices using the Table of Contents provided below. When using this countywide guidance document, please keep in mind that some requirements may vary from one local jurisdiction to the next. In the very early stages of project planning, contact the local permitting agency to schedule a pre-application meeting to learn how the C.3 requirements will apply to your project.

 

TABLE OF CONTENTS OF THE C.3 TECHNICAL GUIDANCE

 

Chapter/ Appendix No.Section
Title
Last Updated
  Cover Page
06/2016
  Local Contacts and Credits
06/2016
 
Table of Contents
06/2016
  Glossary
06/2016
Chapter 1 Introduction/How to Use this Handbook
06/2016
Chapter 2 Background/Regulatory Requirements
06/2016
Chapter 3 Preparing Permit Application Submittals
06/2016
Chapter 4 Site Design Measures
06/2016
Chapter 5 General Technical Guidance for Treatment Measures
06/2016
Chapter 6Technical Guidance for Specific Treatment Measures

06/2016

 
6.1
Bioretention Area
06/2016
 
6.2
Flow-Through Planter
06/2016
 
6.3
Tree Well Filter
06/2016
 
6.4
Infiltration Trench
06/2016
 
6.5
Extended Detention Basin
06/2016
 
6.6
Pervious Paving
06/2016
 
6.7
Turf Block and Permeable Joint Pavers
06/2016
 
6.8
Green Roof
06/2016
 
6.9
Rainwater Harvesting and Use
06/2016
 
6.10
Media Filter
06/2016
6.11Subsurface Infiltration System
06/2016
Chapter 7 Hydromodification Management Measures
06/2016
Chapter 8 Operation and Maintenance
06/2016
Chapter 9 Alternative Compliance
06/2016
  References
06/2016
Appendix A Plant List and Planting Guidance
06/2016
Appendix B Example Development Scenarios
06/2016
Appendix C Treatment Measure Design Criteria Regions for San Mateo County
06/2016
Appendix D Applicability of Inlet Filters, Oil/Water Separators and Hydrodynamic Separators
06/2016
Appendix E Infiltration Guidelines
06/2016
Appendix F Mosquito Control
06/2016
Appendix G Operation and Maintenance Document Templates
06/2016
  Stormwater Treatment Measure O&M Inspection Report Template
06/2016
  Bioretention Area Maintenance Plan Template
06/2016
  Flow-through Planter Maintenance Plan Template
06/2016
  Tree Well Filter Maintenance Plan Template
06/2016
  Infiltration Trench Maintenance Plan Template
06/2016
  Extended Detention Basin Maintenance Plan Template
06/2016
Pervious Pavement Maintenance Plan Template
06/2016
  Non-proprietary Media Filter Maintenance Plan Template
06/2016
  Manufactured Stormwater Treatment Measure Maintenance Plan Template
06/2016
Rainwater Harvesting
06/2016

Appendix H
 Areas Subject to Hydromodification Management Requirements
06/2016
  Countywide Map
06/2016
  Map Index for HM Control in Selected Areas of San Mateo County
06/2016
  Atherton
06/2016
  Brisbane and South San Francisco
06/2016
  Colma and South San Francisco
06/2016
  Daly City and Brisbane
06/2016
  Daly City and County Unincorporated
06/2016
  Millbrae
06/2016
  Millbrae and Burlingame
06/2016
  Pacifica
06/2016
  Pacifica, San Bruno, and South San Francisco
06/2016
  Redwood City and San Carlos
06/2016
  San Bruno and Millbrae
06/2016
  San Mateo
06/2016
  San Mateo and Hillsborough
06/2016
Appendix I Feasibility Evaluation: Infiltration and Rainwater Harvesting/Use
06/2016
Appendix J Special Projects
06/2016
Appendix K Soil Specifications
06/2016
Appendix LSite Design Requirements for Small Projects
06/2016

 

 

 

FLYERS AND FACT SHEETS

Name of Flyer/ Fact Sheet
Prepared By
Date Last Updated
Changes to Stormwater Quality Requirements for Builders, Developers, and Project ApplicantsSMCWPPPJuly 2016

Model Stormwater Conditions of Approval

(Replaces the former Source Control Model List)

SMCWPPPJuly 2016
New Low Impact Development requirementsSMCWPPPJuly 2016
Rain Gardens (for printing and folding)BASMAANovember 2012
Rain Gardens (for online viewing)BASMAANovember 2012
New Requirements for projects that create and/or replace 2,500 to 10,000 square feet of impervious surfaceSMCWPPPSeptember 2012
Managing Stormwater in Landscaping (for printing and folding)BASMAAAugust 23, 2012
Managing Stormwater in Landscaping (for online viewing)BASMAAAugust 23, 2012
Pervious Paving (for printing and folding)BASMAAAugust 23, 2012
Pervious Paving (for online viewing)BASMAAAugust 23, 2012
Rain Barrels and Cisterns (for printing and folding)BASMAAAugust 23, 2012
Rain Barrels and Cisterns (for online viewing)BASMAAAugust 23, 2012
Requirements for Architectural CopperSMCWPPPFebruary 2012

FORMS AND CHECKLISTS

Name of Form
Date Last Updated
Special Projects WorksheetAugust 2016
Biotreatment Soil Mix Verification ChecklistMay 2016
BASMAA Regional Biotreatment Soil Specification 2016April 2016
C3-C6 Regulated Projects Checklist (Word) (Excel)January 2016
Small Projects ChecklistJanuary 2016
Biotreatment Soil Mix Supplier ListJuly 2015
C.3 Sizing Worksheet - Volume Based CriteriaMarch 2015
C.3 Sizing Worksheet - Combination Based CriteriaMarch 2015
Biotreatment Soil Mix Compliance StatementMarch 2014
Memo - Biotreatment Soil Mix Supplier Spec and Regs ResearchMarch 2014
Flow Chart of C.3 and C.6 Stormwater Review ProcessMarch 2013

The Infiltration Feasibility Worksheet and the Rainwater Harvesting and Use Feasibility Worksheet are included in Appendix I of the C.3 Technical Guidance (above).

 

HYDROMODIFICATION MANAGEMENT (HM) REQUIREMENTS

Name of Document or Link
Date Last Updated
Hydromodification Management Requirements: Information for Developers, Builders and Project ApplicantsAugust 2016
Hydromodification Management Applicability FormMay 2010
Bay Area Hydrology Model software and users manual

 

ADDITIONAL RESOURCES AND INFORMATION

Name of Document or Link
Date Last Updated
List of Consultants Qualified to Design, Review, and/or Inspect Stormwater Treatment Measures and Hydromodification Management MeasuresJanuary 2015
LID Feasibility Report, Prepared by BASMAAApril 2011
Developments Protecting Water Quality : A Guidebook of Low Impact Development ExamplesDecember 2009
Sustainable Green Streets and Parking Lots Design GuidebookJanuary 2009