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Home My WebLink About19_Internal Post-Construction Plan Review ChecklistIZck ►t✓� Stormwater Plan Submittal Check List N/A SD DID CD Plans General North Arrow, Scale, Legend, Construction Limits Property Lines Horizontal Datum (NAD 83 State Plane Survey Feet) Jordan Lake Buffer Zones Town of Chapel Hill RCD Buffer Floodplains Streams and Wetlands Significant Natural Heritage Areas Existing Plans Original Survey with Date and Surveyor Information Existing Contours; Vertical Datum Used (NAVD 88) Existing storm structures to remain with location size material and invert elevations Existing storm conduit, swales, or channels to remain with inverts, dimensions, length, and material Existing BMPs with their location, size, surface area, and type Trees with type and diameter at breast height Existing Topographic Info Demolition Plans Any Storm Drain or BMP being removed or abandoned Impervious Area to be Removed Proposed Site Plan Existing Contours Proposed Contours Existing storm drainage infrastructure to remain Proposed storm structure location Size, material, and invert elevations Proposed storm conduit, swales, or channels Inverts, Dimensions, length, and materials Proposed storm conduit and channel schedule Proposed BMPs location and type Size, Surface Area Maintenance Access Proposed other utilities and existing utilizes to remain Proposed land cover shown VERY clearly on plans Proposed Trees and Mature Root Zone Proposed Project Phasing Walls and other grade change locations Storm Drain Profile Sheets with HGL (Can be shown in report instead) Stormwater Detail Sheets Storm Drainage System Details BMP Details in plan, cross-section, and profile views BMP invert, weir, and orifice elevations Version 1 Appendix A 1of3 July 18,2016 Stormwater Plan Submittal Check List I BMP Elevations Consistent through all views BMP surface area at key elevations Emergency Spillways Energy Dissipaters Any Landscape or Architectural drawings related to Storm (PDF Only) Showing roof, landscape and sock drain connections to storm General Plumbing showing roof drainage, elevator sumps, area and floor drains Plan view and details of Green Roofs Stormwater Management Report and Drainage Calculations Short Narrative Identify applicable stormwater management requirements and address how they will be met Identify the types of BMPs proposed Describe the condition of any existing storm drainage infrastructure to remain Describe any proposed changes to the storm drainage system Identify any potential conflicts with existing utilities and indicate an additional site exploration work needed Address the ways in which the Jordan Lake Rules are satisfied For Underground Storage : What happens when storage leaks? How can leaks be found and repaired? What is acceptable leakage rate? Summary Tables Table Summarizing the drainage areas including label and acreage Summary of each BMP, and its drainage area Water Quality Table (Provided Treatment vs. Required) Pre Post Peak Discharge Table Pre Post Volume Table Drainage Area Maps (Pre and Post) Drainage area(s) shall cover the entirety of the project limits, and any offsite areas draining through the project site A drainage area shall be defined for each point where concentrated flow exits the site A drainage area shall be defined for each pipe, channel, or other conveyance mechanism within the site (Post only) All design points shall be clearly shown and labeled All drainage areas shall be clearly labeled Existing and Proposed Land Cover Tables Land cover in square feet for each drainage area Runoff Coefficients used for each drainage area Jordan Lake Accounting Tool worksheets Calculations for BMP Sizing In -Situ Infiltration Test Results (If Infiltration type) Geotechnical Investigation which shall include water table and seasonal high water table (If Applicable) Version 1 Appendix A 2 of 3 July 18, 2016 Stormwater Plan Submittal Check List Hydrology and Hydraulics Calculations (Input and Output Print Outs) Curve Number Calculations Time of Concentration Calculations Water Quality Volume Calculations 2-year volume reduction calculations inside Chapel Hill Peak discharge calculations Existing conditions modeling includes de facto detention For Detention Ponds and Wetlands: X-Section through embankment and compaction requirements Anti -flotation Calculations Stage -Storage Discharge Curves Summary of outlets and elevations Peak Discharges through 1% Chance Storm Peak Water Surface Elevations through 1% Chance Storm Extents of 1% Chance Storm overland Flow Infiltration Calculations for Infiltration BMP's For Cisterns: Demand projection calculations Input/Output from the NCSU rainwater harvester model Storm Drainage Calculations Calculations for each proposed and existing drainage pipe, inlet, and channel. Calculations follow performance criteria in this document Video of Existing Storm Drainage to Remain Specifications Soil Testing for Bioretention and Soil Specifications Permeable Pavement Specifications Green Roof Media Specifications BMP Operation and Maintenance Plan Use NCDENR BMP Operations and Maintenance forms as a starting point Delete agreement portion of form Proprietary product specific operation and maintenance plans Mechanical and Electrical components preventative maintenance requirements Version 1 Appendix A 3of3 July 18,2016