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

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Source Control Measure Fact SheetOutdoor Storage AreasTable OS-1.Design Requirements for Outdoor Storage Areas to Protect Water QualityDesign FeatureCriteriaSize and Location Size the storage area large enough for the expected materials and plan for segregation.Considering planned activities and traffic flow, locate the storage area where it will be convenientbut not in the way of truck and vehicle traffic.Locate storage in a secure place to protect against vandalism and minimize accidents.PavingCoverGrading/DrainageSecondarycontainment forBulk Liquids 1Construct the storage area base with a material impervious to leaks and spills. Contact your localpermitting agency to determine if gravel surfaces are acceptable under certain conditions (e.g.,storage of inert bulk materials).Install a roof or other cover acceptable to the local permitting agency that extends beyond thestorage area (enough to keep rain out), or use a storage shed or cabinet.If solid bulk materials (such as, wood chips and other landscaping materials, sand, lumber, scrapmetal) will be stored and it isn’t feasible to cover the storage area, then omit the cover and followthe drainage requirements for uncovered storage areas (see the next section.)Direct runoff from downspouts/roofs away from storage areas.Hydraulically isolate the area using grades, berms or interceptor drains, to prevent run-on fromsurrounding areas or the runoff of spills. Refer to other fact sheets in this chapter for variousoptions on how to accomplish this.Drainage Options for uncovered storage areas: (discharge to the storm drain system is notallowed)1) If liquids (non-flammable, non-combustible) will be stored in the area, gently slope the storagearea to drain to a dead-end sump. Accumulated water in the sump must be pumped to thesanitary sewer, an on-site stormwater quality treatment control measure, or land disposal, asappropriate based on the quality of the water and the sanitary sewer permit requirements.2) If solid bulk materials will be stored in the area: Slope and arrange the storage area to minimizecontact between stormwater and stored materials (such as wood chips, plant materials, andcompost) that can leach potential pollutants.See notes above for liquids.As a general rule, size the secondary containment to accommodate at least 110% of the volumeof the largest container or 10% of the volume of all the containers.If liquids will be stored in tanks, UL approved double-walled tanks can generally be used in lieu ofother secondary containment. Verify this with the local permitting agency.1 Secondary containment is simply a structure/facility (such as a second container or bermed area) that would catch any spills or leaks from theprimary storage container. Think of secondary containment as spill insurance.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsOS-2 May 2007
Source Control Measure Fact SheetOutdoor Work AreasPhoto: CASQA, 2003PurposeThis fact sheet pertains to work areas that areoutdoors or that open to the outdoors. It specifieshow to design such work areas to keep pollutantsfrom contacting stormwater runoff and being carriedinto the storm drain system or receiving waters.Potential pollutants addressed depend on the workarea but include any materials used on site or thatcould leak from vehicles or equipment. This includes:oil and grease, toxic substances, caustic or acidicsubstances, heavy metals, sediment, organic matter(depletes oxygen levels as it decays in water) and litter.ApplicabilityRefer to Table 4-1 regarding the project land use types that need to comply with this fact sheet. This factsheet addresses outdoor processing and manufacturing areas, as well as general “work” areas. Also, thisfact sheet includes some requirements specific to vehicle repair areas, since auto repair shops are one ofthe priority project categories identified by the stormwater regulations (see Table 3-2 in Chapter 3).However, note that the most appropriate location for vehicle repair is indoors. All outdoor facilities willbe subject to the approval of the local permitting agency.Design RequirementsTo protect water quality, use the requirements shown in Table OW-1 when designing work areas that areoutdoors or open to the outdoors. The requirements are intended to keep such pollutants from soaking intothe ground or reaching the storm drainage system and creeks and rivers. Alternative designs may beapproved provided water quality is protected to an equal or greater extent. Check with the local permittingagency for verification.Design requirements on this fact sheet are intended to supplement (not supercede) those in other codes(such as the Building, Fire, and Zoning Codes and the hazardous waste requirements in Title 22,California Code of Regulations, as applicable). Discuss any potential conflicts with the local permittingagency early in the planning process before proceeding with design. In addition, certain industries aresubject to the State’s Industrial Stormwater General Permit, which is also intended to protect stormwaterquality: see www.waterboards.ca.gov/stormwtr/industrial.html regarding industries subject to the rulesand applicable requirements.Operation and MaintenanceThe design features required by this fact sheet need to be maintained and properly operated. This includesproper handling and disposal of materials which may accumulate in containment devices/areas, ensuringthat covers are not removed from outdoors work areas, and drains do not become disconnected. Inaddition, features may be subject to inspections by local fire and/or sanitary sewer agencies, depending onthe configuration.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007OW-1
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Page 5 and 6: Table of contentsOutdoor Work Areas
Page 7 and 8: Table of contentsSF-1.SF-2.SF-3.SF-
Page 9 and 10: Other Development Community Reviewe
Page 11 and 12: 1 IntroductionPurposeThis Stormwate
Page 13 and 14: IntroductionIn July 2003, the permi
Page 15 and 16: IntroductionFor redevelopment proje
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Page 19 and 20: 2 An Integrated Approach toEffectiv
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Page 31 and 32: Chapter 3As the name implies (and a
Page 33 and 34: Chapter 3Step 9: Establish Long Ter
Page 35 and 36: Chapter 4Source Control Fact Sheets
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Page 51 and 52: 5 Runoff Reduction Control Measures
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Runoff Reduction Control Measure Fa
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Chapter 6• What are pollutants of
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Chapter 6For projects using any of
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Runoff Treatment Control Measure Fa
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Design Data Summary SheetConstructe
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Technical RequirementsInfiltration
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Technical RequirementsSand FilterSa
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Technical RequirementsVegetated Swa
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Glossaryexposure of construction ma
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GlossaryLow Impact Development (LID
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GlossaryRegional Stormwater Quality
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Appendix ASubmittal RequirementsThe
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Sacramento County Supplemental Appl
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Example Post Construction Stormwate
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Typically maintenance agreements an
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Example Maintenance Covenant(Sacram
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Device in accordance with the maint
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[attach]DECLARANT’S ACKNOWLEGEMEN
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Recorded at the request of:CITY OF
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9. The obligations herein undertake
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EXHIBIT B[Map/Illustration]
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City of FolsomThe City of Folsom ow
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Appendix D-1: Residential Sites: Ru
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Form D-1d: Alternative Driveway Des
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Form D-2a: Disconnected Pavement Wo
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Appendix D-3Runoff Reduction Credit
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These tables refer to runoff reduct
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Mature TreeShape Canopy (dia.) Heig
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Appendix D4LID Credits Background R
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unoff from the driveway by 60% whil
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The designer must determine how man
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Or the ASCE-WEF method (Sacramento)
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Table 3 - Multipliers Based on Rati
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Using the Effective Area Managed in
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SMRC, The Stormwater Manager’s Re
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Flow-based control measure design s
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4. Apply the Rational Formula to ca
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5. Enter the capture curve selected
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1.201.000.80STORAGE (in)0.600.4024-
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1.201.000.80STORAGE (in)0.600.4048
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Subject: VEGETATED SWALE EXAMPLEPLA
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PART II:Routing Excess Runoff throu
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4. Design the OutletThe outlet shou
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Exhibit 1Water Quality Orifice Outl
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3. Calculate Planter Surface Area A
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• Bottom slopes of 0.01 to 0.05%
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Appendix HDrainage Design and Storm
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