Contra Costa Clean Water Program

Stormwater C.3 Guidebook 3rd Edition (October 2006, 5.2 MB .pdf)

Updates and Errata, (latest is May 30, 2007; 85KB .pdf)

Additional Appendices and Attachments

Most appendices are included in the downloadable version of the Guidebook. The following material is not included in that file:

Appendix A: Local Exceptions and Requirements

Follow the link to the local municipality website:

Appendix B: Plant List

The Alameda County Clean Water Program has prepared a detailed Plant List and Planting Guidance for Landscape-Based Treatment Measures. It is in Appendix B to that Program’s C.3 Technical Guidance. (8.49 MB .pdf)

Attachment C-2—Infiltration Feasibility Screening Tool

The Contra Costa Clean Water Program has developed a simple way to obtain relevant available data for any particular location with the County. In response to input of an Assessor’s Parcel Number (APN) for a site or coordinates for a particular location, the Program’s query tool will produce a brief text report summarizing: Soil groups, land-use categories, heavily trafficked roadways, slopes, geologic hazards, potential soil and/or groundwater contamination, and vulnerable groundwater areas or existing water supply wells.

For access to the screening tool please contact Michelle McCauley, Administrative Analyst, @ (925) 313-2194.

Attachments to Appendix D: Flow Control

Attachment D-2: Guidance for HSPF Modeling (763 KB .pdf)
Attachment D-3: Stream Classification Methodology (1.5 MB .pdf)

For the stream stability handbook sheets referenced in Attachment D-3, see the Hydrograph Modification Management Plan (HMP) on the page of submittals to the Regional Water Quality Control Board

Appendix G: Example Stormwater Control Plans

Stormwater Control Plan for Rose Garden (Report), 668 KB .pdf
Stormwater Control Plan for Rose Garden (Exhibit), (42" x 30", 1.4 MB .pdf)
Stormwater Control Plan for Seal Island Estates (Report), 210 KB .pdf
Stormwater Control Plan for Seal Island Estates (Exhibit), (11" x 17", 1.9 MB .pdf)
Stormwater Control Plan for Subdivision 8938—Nove Property (Report), 158 KB .pdf
Stormwater Control Plan for Subdivision 8938—Nove Property (Exhibit), (42" x 30", 3.7 MB .pdf)
Stormwater Control Plan for Subdivision 8880—Almondridge East (Report and Exhibit), 748 KB .pdf

Appendix H: Contra Costa Hydrology Data

Isohyetal Map (Drawing B-166), 11" x 17", Low Resolution, 630 KB .pdf
Isohyetal Map (Drawing B-166), 11" x 17", High Resolution, 10.6 MB .pdf
Chart: Unit Basin Storage Size for 80% Capture. 8½" x 11", 17 KB .pdf
Contra Costa Hourly Rainfall Data (for continuous runoff simulation modelers) 1 MB .zip

Appendix I: Integrated Management Practices Sizing Calculations

Appendix I: Sizing Integrated Management Practices (November 21, 2006, 470 KB .pdf) contains instructions for sizing Integrated Management Practices (IMPs) by manual calculations.
IMP Sizing Calculator, including documentation (December 18, 2006 version 0.9.0.0, help file notes mislabeled swale dimensions in Summary Report, 1.5 MB .zip file). Documentation only (753 KB .pdf file). The IMP Sizing Calculator requires Microsoft .NET Framework 2.0, which can be downloaded here (may require administrative privileges to install on your computer).

Appendix J: Example Stormwater Control Operation and Maintenance Plans

Stormwater Control Operation and Maintenance Plan for Pine Hollow Estates, (Partial Draft, December 2005, 213 KB .pdf)

Appendix K: Local BMP Operation and Maintenance Verification Program

Follow links to open local municipality web page in a new window:

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