Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

Chapter 3runoff reduction first (even if not required) will result in a reduced volume or flow ofrunoff that needs to be treated.Step 3: Evaluate Best Approach toProtect Stormwater QualityEvaluate the best approach to protecting stormwater quality considering the siteconditions, required controls, and the principles outlined in Chapter 2. As explainedin Chapter 2:• Identify opportunities and constraints given the site conditions• Preserve valuable site features where possible (and where required) and workwith the topography• Seek to integrate stormwater controls throughout the site design, such asincorporating them into landscaping and reducing runoff close to its source• Look for cost-effective, aesthetically-pleasing ways to treat runoff (if treatment isneeded)Step 4: Select Source Control Measures (Chapter 4)Based on step 3, Chapter 4 and Table 4-1, select appropriate source controlmeasures. Source controls are intended to keep pollutants from mixing with runoffand traveling off the site. All projects require permanent “no dumping-drains tocreek/river” markings to be applied to storm drain inlets. In addition, source controlmeasures are required for the following areas where there is the potential forpollutants to be exposed to stormwater runoff:• Fueling areas• Loading areas• Outdoor storage areas• Outdoor work areas (e.g., processing, manufacturing)• Vehicle and equipment wash areas• Waste management areas (garbage, recycling,restaurant food waste)Source controlmeasures keeppollutants frommixing with runoffand traveling offthe siteStep 5: Select Runoff Reduction Measures (Chapter 5)Include runoff reduction measures in your project design if any of the followingapply:• The project requires treatment controls (see Step 6) and you want to reduce theneeded size (and associated cost) of required treatment.• You conclude it is cost-effective to incorporate runoff reduction measures andyou would like to provide the environmental benefit of doing so.• They are required by the local permitting agency for the particular project.Stormwater Quality Design Manual for the Sacramento and South Placer Regions3-4 May 2007