1. Stormceptor Stormwater Quality Systems Update to Cold Climate Design, Use, and Installation
Presented by:
Corky Lambert & Peter Van Tilburg
In cooperation with the Municipality of Anchorage

2. Parties Involved Imbrium Systems / Stormceptor
Pacific Stormwater Consulting / Rinker
D&S Concrete
Municipality of Anchorage
Streets/ maintenance group
Inspection
Engineering Design
Project Oversight
Watershed Management

3. Stormceptor Presence In Anchorage and surrounding cities:
117 – STC 450i’s (48” I.D.)
54 – STC ’s (72” I.D.)
26 – STC ’s (96” I.D.)
9 – STC ’s (120” I.D.)
5 – STC 7200’s (144” I.D.)
6 – STC Series 13,000-16,000’s (2-120” or 144” I.D.)
An Estimated tons of Pollutants captured each year

4. Design Features & Operations

5. Stormceptor® Stormceptor designed for Sediment Capture
Fine Sediment Capture (1 to 1000 micron)
Re-suspension prevention
Validated by 2 University Tests
Oil & Spill Capture
Validated by University %

6. PCSWMM for Stormceptor®TM
Stormceptor is sized by a continuous hydraulic model.
Anchorage Water Quality Objective
50 % TSS Removal of the 20 micron particle size
80% TSS Removal of the 100 micron particle size
Whichever sizes a larger system
Based on an ANC Rainfall station
Drainage area (acres)
Imperviousness (%)
PCSWMM for Stormceptor®TM
Basis of Calculations is a Combination of Physical Models:
1. Pollutant Build-up Model
2. Pollutant Wash-off Model
3. USEPA SWMM Hydrologic Model
4. Mixing Model
5. Settling Equations

8. Constructability & Flexibility
Easy to install
One-inch drop between the inlet and outlet pipes
makes Stormceptor:
compatible with existing infrastructure
ideal for retrofits and new development projects
Multiple pipe inlets
More than one storm drain can connect to a single unit, eliminating the need for additional structures
Stormceptor can be used as an alignment-change structure
No moving parts or filters to maintain

10. STC 2400
2-hole access
(now standard)

11. Typical Sludge / Sediment

12. New Design! Double manhole access opening Sloped Floor
Vactor wand access points
Hatch option for shallow installations
Curb inlet double-access design (STC 750i)

17. Design Review Procedures
A Shop drawing will be created for each System prior to manufacture
The Shop drawing will be reviewed by Streets maintenance
Approved drawings will be necessary for construction on-site
Access for Maintenance trucks will be provided – with and access road if necessary

18. Installation Procedures

19. Fiberglass insert pre-installed at D&S Concrete’s facility.

21. Questions? Comments? peter@pacificstormwater.com
Thank you!
Questions? Comments?