Urban development is a major contributor to stormwater-caused pollution. Development or redevelopment of properties represents an opportunity to incorporate post-construction controls that can reduce water quality impacts over the life of the project.
The City’s NPDES Permit (MRP) requires that development and redevelopment projects that create or replace impervious areas will have to follow certain stormwater control measures (Section C.3 of the permit). There are resources available to help project applicants incorporate post-construction stormwater controls in development project designs. In addition to these requirements, development projects creating new impervious surface areas will have to meet the Contra Costa County Flood Control District’s Stormwater Drainage area requirements.
- C.3 Requirements: Development
- CCCWP C.3 Stormwater Guidebook 9th Edition (PDF) – April 17, 2024 : This edition reflects Contra Costa Permittees’ adoption of the Bay Area Hydrology Model (BAHM) and updated resources for land development and redevelopment projects. Supersedes the 8th Edition, published in 2022.
- Stormwater Control Plan Template (PDF) – April 17, 2024 : This template helps applicants prepare the required project submittal.
- Development Review Checklist (Excel) – April 17, 2024 : This checklist was adapted from the San Mateo Countywide Pollution Prevention Program’s checklist.
- Bay Area Hydrology Model (BAHM) and BAHM Trainings : BAHM is required to be used for HM compliance demonstration purposes, for applicable projects submitted for review on or after April 17, 2024. BAHM was created by Clear Creek Solutions and was updated in 2023 to incorporate Contra-Costa specific environmental data.
- IMP Calculator Updates – April 17, 2024 : The IMP Calculator was updated per the 9th Edition Guidebook updates, including the adoption of BAHM for HM compliance.
- CCCWP 2023 HM Applicability Map : This map was created for rapid initial determination of whether location-based HM requirements apply to proposed land development projects in jurisdictions across the Contra Costa County.
- MRP 3.0 (PDF)
Operations and Maintenance of Stormwater Facilities
Operation and maintenance of stormwater treatment measures (IMPs) are required for all new and redevelopment projects. The City of Oakley will be reaching out to individual properties with IMPs to verify that these measures are being maintained and operated properly.
For questions related to the new and redevelopment project requirements, contact (926) 625-7154.