This WQMP template shall be used for projects that create and/or replace between 2500 and 5000 square feet of impervious surface; and for detached single family residence projects that create or replace ≥ 2500 sq. ft., and are not part of a larger plan of development consistent with Section E.12.b of the MS4 Permit. Do not be confuse this template with the “Regulated Project” WQMP template or the Phase I WQMP for the Santa Ana Watershed area of San Bernardino County.
Projects must provide all information requested below. The information provided for a Preliminary WQMP should give sufficient detail to identify the major proposed site design measures that impact site planning. The Final Project WQMP must identify all site design measures and source control BMPs incorporated into the final site design, and provide other detailed information as described herein.
This information will document the project’s site design measures, source control BMPs, and establish performance criteria and long term maintenance responsibilities for the project.
Describe the ownership/management of all portions of the project and site. State whether any infrastructure will transfer to public agencies (City, County, Caltrans, etc.) after project completion. State if a homeowners or property owners association will be formed and be responsible for the long-term maintenance of project stormwater facilities. Describe any lot-level stormwater features that will be the responsibility of individual property owners.
In the space above, describe property ownership/management responsible for long-term maintenance of the site design.
Describe project site conditions relevant to the selection of Site Design Measures through an analysis of the physical conditions and limitations of the site. Identify distinct drainage areas (DA) that collect flow from each portion of the site and describe how runoff from each DA is conveyed to the site outlet(s).
A map presenting the DAs must be included as an appendix to the WQMP. Small sites may have only one DA.
Take GPS measurement at approximate centroid of site.
In the spaces below, briefly describe on-site drainage features to convey runoff that is not retained within a DA.
Provide a brief description.
Site design measures are project design methods that help reduce runoff generation and transport of pollutants offsite.
Projects must evaluate site conditions such as soil type(s), existing vegetation, and flow paths, which will influence the overall site design.
Please provide a narrative of site design practices utilized or rationale for not using practices.
Please provide a narrative of how site plan incorporates preventive site design practices.
Include an attached Site Plan layout which shows how preventative site design practices are included in the WQMP.
Projects shall implement one or more of the following site design measures to reduce project site runoff. ROOFTOP REQUIRED.
In the spaces below, provide description of proposed implementation/rationale for no implementation. Only complete spaces for your site's proposed plan.
A vegetated area including trees, shrubs, and herbaceous vegetation, that exists or is established to protect a stream system, lake, reservoir, or coastal estuarine area.
Improvement and maintenance soil through soil amendments and creation of microbial community.
Planting and preservation of healthy, established trees that include both evergreens and deciduous, as applicable.
Rerouting of rooftop drainage pipes to drain rainwater to rain barrels, cisterns, or permeable areas instead of the storm sewer. Required for all projects.
Pavement that allows runoff to pass through it, thereby reducing the runoff from a site and surrounding areas and filtering pollutants.
A vegetative layer grown on a roof (rooftop garden); not recommended.
Open-channel management practice designed specifically to treat and attenuate storm water runoff.
System that collects and stores storm water runoff from a roof or other impervious surface.
Project proponents shall use the State Water Board SMARTS Post-Construction Calculator, or equivalent, to quantify the runoff reduction resulting from implementation of site design measures.
If none of the above site design measures are applicable or appropriate, provide proposed alternative BMP/approach and supporting rationale below.
Projects with pollutant-generating activities and sources are required to implement standard permanent and/or operation source control measures as applicable. Form 4.2-1 and 4.2-2 are used to describe specific source control BMPs used in the Site Design WQMP, or to explain why specific BMPs are not applicable. Table 7-3 of the TGD for WQMP provides a list of applicable source control BMP for projects with specific types of potential pollutant sources or activities. The source control BMPs in this table must be implemented for projects with these specific types of potential pollutant sources or activities.
The site owner shall review the source control BMP requirements for development projects, and the specific BMPs required for this project as specified in Forms 4.2-1 and 4.3-2. All applicable non-structural and structural source control BMPs shall be implemented in the project.
The identified list of source control BMPs correspond to the CASQA Stormwater BMP Handbook for New Development and Redevelopment may be found at the link above.
Projects with pollutant-generating activities and sources as described below shall implement all applicable standard permanent and/or operational source control measures to minimize pollutant discharges for these sources.
Source Control Measures for the following pollutant generating activities and sources shall be designed consistent with recommendations from the CASQA Stormwater BMP Handbook for New Development and Redevelopment or equivalent manual, and include:
Spill contingency plan; cleanup materials on site.
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