NEW REQUIREMENTS EFFECTIVE SEPTEMBER 28, 2017
Water Quality regulations for Priority Projects include Low Impact Design (LID) on-site retention requirements and Hydromodification Management measures which can be significant elements in the site design of your project and therefore it is crucial that they be considered early in the design process.
Please note that the documents provided below reflect the current requirements, as of September 28, 2017. Please disregard all previous versions, as they will not be acceptable.
The City encourages all applicants to contact Lisa Zawaski, Senior Water Quality Engineer at (949) 248-3584 or by email at firstname.lastname@example.org, to discuss the water quality requirements for your project early in the planning phase to ensure that your design will meet applicable requirements.
All development/redevelopment projects, regardless of priority, shall implement the site design and source control principles, where applicable and feasible, to maximize infiltration, provide retention, slow runoff, and reduce pollutants at the sources. The Non-Priority Project Water Quality Checklist will be required as part of the grading plan submittal.
All priority projects shall meet Water Quality Management Plan (WQMP) and Hydromodification Management Plan (HMP) requirements as described in the documents and tools below. The project's WQMP is a plan for minimizing the adverse effects of urbanization on site hydrology, runoff flow rates and pollutant loads. Hydromodification management measures address the changes in the magnitude and frequency of stream flows and associated sediment load due to urbanization or other changes in the watershed land use and hydrology and the resulting impacts on receiving channels, such as erosion, sedimentation and potentially degradation of in-stream habitat.
To determine if your project is a Priority Development Project and requires a WQMP, use the Priority Development Project (PDP) Criteria List.
Note: The Preliminary WQMP (pWQMP) is required as part of the Project Application. An application will not be deemed complete without a pWQMP. It should be noted that the pWQMP is not a "conceptual" document in the normal sense of the word and requires detailed engineering sizing calculations and location details for selected BMPs.
The following updated documents and tools will assist you in preparing an acceptable Water Quality Management Plan (WQMP), including appropriate hydromodification management measures, for your project. Please note that these are the current documents, dated September 28, 2017. Please disregard previous literature.
Documents and Tools for WQMP/HMP Preparation:
South Orange County Model WQMP, dated September 28, 2017. This document describes the water quality requirements.
Technical Guidance Document (49 MB) for South Orange County, dated September 28, 2017. This document is the technical resources companion to the Model WQMP and the WQMP Template and is the "how" to meet the requirements in the Model WQMP and how to use the WQMP Template to prepare your project's WQMP. This document is bookmarked and internally linked for easy navigation.
WQMP Template (MS Word), dated September 28, 2017. This WQMP template is the framework for preparing your project's WQMP. The use of this template is highly encouraged and will facilitate acceptable preparation and City' review and approval of your project's WQMP.s
Dana Point O&M Plan Template (MS Word), dated September 28, 2017. This O&M Plan template will help you prepare an acceptable O&M Plan as part of the Final WQMP. Please note that the O&M will be a separate, stand-alone, user-friendly document and includes a BMP site plan.
Worksheets from the TGD. The below worksheets are identical to those contained in the TGD, however they are available in editable MS Word so that they can be created for your project and included in your project's WQMP.
- Worksheet 01 - Infiltration Feasibility Categorization
- Worksheet 02 - Summary of Groundwater-Related Feasibility Criteria
- Worksheet 03 - Factor of Safety and Design Infiltration Rate
- Worksheet 04 - Hydrologic Source Control Calculation Form
- Worksheet 05 - Simple Design Capture Volume Sizing Method
- Worksheet 06 - Capture Efficiency Method for Full Infiltration
- Worksheet 07 - Biofiltration Routing Method
- Worksheet 08 - Static Volume Method for Sizing Bioretention BMPs
- Worksheet 09 - Flow-Based Compact Biofiltration Method
- Worksheet 10 - Nomograph Method for Determining Capture Efficiency
- Worksheet 11 - Capture Efficiency and Multiplier Method
Hydromodification Management Plan, dated April 1, 2015. This document describes the hydromodification requirements and the process to develop the project's hydromodification management measures, when applicable.
Note: South Orange County has submitted to the San Diego Regional Water Quality Control Board a Watershed Management Area Analysis (WMAA) that proposes additional exemptions to the Hydromodification Management Requirements. Once the WMAA is accepted, the additional exemptions may be effective, however until then, the current exemptions only include:
- Existing underground storm drains discharging directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean; and
- Conveyance channels whose bed and bank are concrete lined all the way from the point of discharge to water storage reservoirs, lakes.
Please contact Lisa Zawaski at email@example.com to get the current status in order to properly plan for your project.
For all food service facilities undergoing remodel, transfer of ownership and/or requiring Certificate of Occupancy:
- WQ Grease Management & Expanded Polystyrene (EPS) Ban Certification Form (PDF)
- NEW! WQ Grease Management & (EPS) Form INSTRUCTIONS (PDF)
For existing food service facilities: Grease Management Rebate Program