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

Chapter 6For projects using any of the treatment control measures in this chapter, verificationof long-term maintenance provisions is required. This is mandated by the agencies’State-issued stormwater permits. The local permitting agencies in the Sacramentoand South Placer areas require execution of a maintenance agreement, covenant orpermit with the property owner. Typically maintenance agreements and covenantsare recorded with the deed for the property and follow property ownership. Suchmaintenance agreements require reconstruction or replacement of the feature whenit fails to function properly. For informational purposes, Appendix B presentsprojected lifespan information for the various control measures.Check with the local permitting agency about the maintenance submittalrequirements and timing for execution of the agreement. See Appendix B foradditional information and a sample maintenance agreement .Treatment Control Measure Fact SheetsThe remainder of this chapter includes fact sheets for various treatment controlmeasures. Each fact sheets describe siting, design, construction considerations, andmaintenance requirements to ensure optimal performance of the measures.Proprietary Treatment Control MeasuresProprietary stormwater quality treatment measures are manufactured devicesintended to capture and treat post-construction site runoff to remove pollutants. Thepermitting agencies in Sacramento County and the City of Roseville allow certainproprietary devices for treatment of runoff, under certain conditions, as describedbelow.Agencies in Sacramento. Since the late 1990's, the Sacramento StormwaterQuality Partnership has been conducting a study to investigate and verify the fieldperformance of proprietary stormwater quality devices. In November 1999, thePartnership published a report that describes the protocol that must be followed inorder for a particular device to be accepted for use in the Sacramento area. Theprotocol is based on a comparison of the performance of the proprietary device tothat of widely- accepted public domain measures, such as vegetated swales.Manufacturers are invited to submit data that can be reviewed for conformance withthe protocol. In addition to devices accepted using the Sacramento area protocol, thePartnership will consider technologies with the Washington State Department ofEcology's General Use Level Designation for Basic (TSS) Treatment on a case by casebasis.For an updated list of accepted devices and more details on the Sacramentoproprietary study, see www.sacramentostormwater.org (new development). Inselect cases, the local permitting agency may allow the use of other proprietarytreatment measures as a "pilot study." In such cases, the property owner and/ormanufacturer will be required to fund and complete a monitoring study to verify thedevice's performance. Since approval is not guaranteed, site designers proposing touse an alternative technique should coordinate with the permitting agency early inthe site design process.Stormwater Quality Design Manual for the Sacramento and South Placer Regions6-4 May 2007