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

Appendix ASubmittal RequirementsThe submittal related to post-construction stormwater quality control measures for the project shall bemade in the format specified by the permitting agency. The submittal shall include sufficient design detailand calculations to demonstrate the adequacy of the design to meet the agency requirements, and shallconsist of the following information, at a minimum:• Total site acreage• Project density (residential projects only)• Impervious areas: existing & proposed buildings and other structures; pavement• Pervious areas: landscaped, open space, other areas• Grades/contours (agency may specify contour interval)• Drainage systems, including pipe materials, sizes, slopes and invert elevations• Contributing drainage shed(s) – delineate and give acreage of the sheds contributing runon and runoffto and from the project; identify those sheds associated with the proposed stormwater quality controlmeasures• Location(s) where site discharges to municipal storm drain system and/or receiving waters• Existing tree canopies and locations of proposed new evergreen/deciduous trees (if interceptor treecontrol measure is being proposed)• Type and location of proposed post-construction stormwater quality control measures*, indicating foreach measure: size/label of contributing shed(s); amount of contributing impervious and perviousarea; and WQV or WQF to be treated.• Design parameters used to determine size of proposed control measures, including runoff reductionworksheets, if applicable. Include calculations where appropriate/required (permitting agency mayallow cross-reference to Drainage Study). Record this information on the “Design Data SummarySheet” provided at the end of each fact sheet in Chapter 6.• Details for post-construction control measures, including the following information, whereapplicable:o Dimensions and setbacks from property lines and structureso Profile view, including typical cross-sections with dimensionso Water surface elevations/freeboardo Inlets, outlet structures, and release pointso Vegetation & growing medium specifications, incl. provisions for temporary irrigation ifneededo Specifications for construction materials, such as filter fabric and infiltration materialso Installation requirements• Maintenance requirements shall be submitted separately. See Appendix B in Design Manual.*Control measures may be those included in the Stormwater Quality Design Manual for Sacramento and SouthPlacer Regions or alternative measures. For projects proposing use of control measures not specified in the DesignManual, the review and approval process may take longer. Also, slight variations to design criteria stated in themanual may be approved on occasion, provided the agency determines that performance of the facility itself or othersite structures/features is not compromised. For agencies in Sacramento County, proposals of alternative proprietarystructural devices may be accepted if the manufacturer can satisfy the agencies’ protocol or the property owneragrees to conduct a pilot scale monitoring study.To avoid delays, all alternative proposals should be discussed with the stormwaterquality staff at the permitting agency as early as possible in the planningstages of the project, preferably at the pre-application meeting.