Post-Construction BMPs


Countywide Stormwater Pollution Prevention Program

Foam Pollution (Stormwater)

Post-Construction BMPs

The following is a list of resources available for developers, builders and other project applicants with information on the use of site design, source control and treatment control BMPs to control the quality and quality of runoff during the use of development projects.  

 BASMAA Post Construction Manual for Phase II Municipalities


BASMAA Post-Construction Manual_cover page

 This manual is intended to help development project applicants design and submit their projects for approval.  It applies to projects in all the municipalities in the NCSPPP service area including the cities of Napa, American Canyon, St. Helena, and Calistoga, the Town of Yountville and the County of Napa.  To help applicants calculate the size of bioretention features, download the Post Construction Sizing Calculator.

 Appendix C and Appendix D of the Manual are Stormwater Control Plan (SCP) Templates, provided to assist project applicants in writing their own SCPs.  For convenience, these documents are provided in Microsoft Word format.

Appendix F of the Manual is a Bioretention Plant Matrix. For convenience, it is provided in Excel format.

2 Hypothetical Example Projects were developed (residential subdivision and commercial project) for the assistance of project applicants.  Example SCPs and O&M plans for these projects, along with completed sizing calculator spreadsheets, can be found below.

Residential Subdivision

Example SCP for residential

Example O&M Plan for residential

Example Bioretention Sizing Calculator for residential

Commercial Project

Example SCP for commercial

Example O&M Plan for commercial

Example Bioretention Sizing Calculator for commercial 

Soil Media Specifications and Suppliers

Bioretention Soil Media Specification - all projects installing bioretention facilities must use a special soil mix in the installation

Bioretention Soil Suppliers - a list of vendors of bioretention soil media in the greater San Francisco Bay Area


Non-LID Treatment Facilities

Pages 3-5 of the Manual list circumstances in which non-LID treatment facilities are allowed

Technical Criteria for non-LID treatment facilities describes conditions to achieve permit requirements


To view the slides from the 2nd Annual Post Construction Training held on January 21, 2016, click here


Stormwater Best Management Practice Handbook - New Development and Redevelopment.
This is one of a series of handbooks developed by the California Association of Stormwater Quality Agencies (CASQA) to provide guidance on selecting and implementing BMPs to reduce the discharge of pollutants from construction sites.  Click here for download.


 Start at the Source, 1999 Edition and May 2003 Companion Document, Bay Area Stormwater Management Agencies Association (BASMAA)
 This document is intended for use in the planning and design phases of residential, commercial, institutional and industrial development and redevelopment.  It recognizes that one of the best opportunities to reduce the generation of urban runoff or “nonpoint source pollution” from development is through planning and design.

Post-Construction Stormwater BMPs in Action

This guidebook provides examples of Post-Construction BMPs that have been incorporated into the design of development projects in the northern half of the San Francisco Bay.  Click here for download.

Slow It, Spread It, Sink It

 This user-friendly manual describes simple ways homeowners can incorporate features into their landscape that treat stormwater runoff and recharge groundwater.