2016 Stormwater Code SDCI Training Seattle Municipal Tower, Suite 4080 Presented by: Eric Dripps [email protected] Matthew Bateman Drainage Review
Ede Courtenay Drainage Review Supervisor Roger Moore Site Inspection Supervisor Agenda
Introductions Review Thresholds Onsite Stormwater Management Using the calculator Infiltration Testing Standard Plans and Examples Visit the Stormwater Code Page for all of the documents discussed in this presentation http://www.seattle.gov/dpd/codesrules/codes/stormwater
/default.htm 2 Thresholds Based on New Plus Replaced Hard Surface All Projects > 750 SF
>750 SF + New lot >1,500 SF >2,000 >5,000 SF Parcel SF Based
Side Sewer Review Drainage Review Drainage Review and OSM
OSM All Projects FC may apply SS
Conflicts Discharg e Points CSC Sheet DWC Sheet with OSM Project Info Completed Small PIT for no approved
discharge point PE REQ WQ may apply
OSM BMPs Complete Summary Sheet PDF of entire workbook Infiltration Testing
4 On-site Stormwater Management Two Methods to Meet Requirement: On-Site List Approach On-site Performance Standard
Choose BMP in highest category feasible Choose BMPs to meet discharge requirements BMPs are pre-sized except Rainwater Harvesting Continuous RainfallRunoff Modeling
Requires a report and sizing calculations (PE Required) 5 6 7 Onsite Stormwater
Management Calculator http://www.seattle.gov/dpd/cs/groups/pan/@pan/documents /web_informational/p2385087.xlsm Updates periodically. Please use the most up-to-date version from the website. Use the Preliminary Assessment Report (PAR) Enable Content Combine as many surfaces as possible for clarity
8 Infiltration The Manual Volume 3, 3.2. Determine Infiltration Feasibility Appendix D http://www.seattle.gov/dpd/cs/groups/pan/@pan/documents/ web_informational/p2358274.pdf Simple Test Checklist http://www.seattle.gov/dpd/cs/groups/pan/@pan/documents/ web_informational/p2358611.pdf
Pilot Infiltration Test Checklist http://www.seattle.gov/dpd/cs/groups/pan/@pan/documents/ web_informational/p2358612.pdf 9 Infiltration Design Investigation and
Testing Construction 10 Infiltration BMPs On-site Stormwater Management
Infiltration Feasibility Infiltration Eval Not Reqd http://web6.seattle.gov/DPD/Maps/dpdgis.aspx 13 14 15
Subsurface Investigation Simple Map of investigation and testing locations Soil Characteristics Depth to Groundwater
Standard/ Comprehensive Soil Strata Characteristics Detailed Soil Logs Comprehensive by
licensed professional Simple Infiltration Test
Use Checklist Dry Season vs Wet Season Minimum 2-feet deep x 2 across-feet hole Pre-soak Testing
Measured Rate Design Rate Pilot Infiltration Test (PIT) Mimics constructed facility Licensed Professional Required Small vs Large PIT Use Checklist
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