See something we could improve on this page? Give website feedback.
Label:
Information
The Oldcastle BioPod™ Biofilter System with StormMix™ Media meets the pollution reduction requirements of the City of Portland’s Stormwater Management Manual. It is approved for use in the City of Portland. See conditions.
Conditions of use
- All configurations covered in the Washington State Department of Ecology Technology Assessment Protocol approval for the Oldcastle BioPod™ Biofilter are approved for Total Suspended Solids (TSS) removal. Selection of a specific configuration is the responsibility of the project designer.
- Use of the Oldcastle BioPod Biofilter does not exempt a project or site from required flow control requirements, operations and maintenance requirements, or other applicable requirements of the Stormwater Management Manual.
- For use in the public right-of-way, the following conditions must be met:
- Units must meet City of Portland street design requirements, including but not limited to H-20 vehicle load rating, non-slip surface, and American with Disabilities Act tolerances specific to surface grates or vault lids.
- The Operations & Maintenance Plan must call for an assessment during the two-year warranty period of project-specific maintenance requirements and frequencies.
- Oldcastle-certified providers should be utilized for activation, inspection and maintenance of the system.
Project designer responsibilities
- Ensuring that the Conditions of Use are met.
- Ensuring that the project meets all applicable requirements of the Portland Stormwater Management Manual, including the Stormwater Infiltration and Discharge Hierarchy.
- Ensuring that the design and installation of the units are appropriate for the project goals, site conditions, long-term maintenance requirements, and any other site-specific design requirements on private property or for use in the public right-of-way.
- Sizing units to meet the current Portland Stormwater Management Manual presumptive design approach and pollution reduction requirements. The pollution reduction capacity is flow-based and assumes a treatment flow intensity of 0.19 inches per hour, 5 minute time of concentration, and a 0.90 runoff coefficient using the Rational Method with treatment rates based upon the Washington State Department of Ecology General Use Level Designation approved flow rates. The treatment capacities for the Oldcastle BioPod Biofilter, based on those assumptions, are provided in Table 1. For sites with different times of concentration, different rainfall intensities may be appropriate.
| Model size | Internal bypass Biofilter area (ft2) | Internal bypass design flow rate (cfs) | Internal bypass maximum drainage area per unit (ac) | External bypass Biofilter area (ft2) | External bypass design flow rate (cfs) | External bypass maximum drainage area per unit (ac) |
|---|---|---|---|---|---|---|
| 4' x 4' * | - | - | - | 16.0 | 0.06 | 0.33 |
| 4' x 6' * | 20.9 | 0.07 | 0.43 | 24.0 | 0.08 | 0.50 |
| 4' x 12' * | 44.9 | 0.16 | 0.93 | 48.0 | 0.17 | 0.99 |
| 4' x 16' * | 60.9 | 0.22 | 1.26 | 64.0 | 0.23 | 1.32 |
| 4' x 20' * | 76.9 | 0.27 | 1.59 | 80.0 | 0.28 | 1.66 |
| 6' x 6' | 32.9 | 0.12 | 0.68 | 36.0 | 0.13 | 0.75 |
| 6' x 8' | 44.9 | 0.16 | 0.93 | 48.0 | 0.17 | 0.99 |
| 6' x 12' | 68.9 | 0.24 | 1.43 | 72.0 | 0.25 | 1.49 |
| 8' x 16' | 124.9 | 0.44 | 2.58 | 128.0 | 0.45 | 2.65 |
*Availability of these model sizes varies depending on configuration; see drawings for specifics.
- Each site plan must be reviewed by Oldcastle before the City of Portland can approve the unit(s) for site installation. A letter certifying the project has been designed to the manufacturer's specification must be submitted to the Bureau of Environmental Services prior to the appropriate design milestone. For public improvements, including public works permits, the letter must be submitted to the Bureau of Environmental Services prior to the 60% plan review. For installation on private property, the letter must be submitted prior to building permit plan approval. The project designer is highly encouraged to work with Oldcastle prior to the appropriate review milestone to optimize placement and performance of the unit(s).
- If the project designer wishes to vary from these conditions of approval, the project designer must use the Performance Design Approach required by the Stormwater Management Manual.
Approval conditions
- The Bureau of Environmental Services may at any time suspend or revoke approval if the performance of the technology does not meet performance criteria, if there are changes to the Technology Assessment Protocol certification, or the performance criteria change due to local, state, or federal pollution reduction standards.
- If any changes, updates, or revisions occurred to the BioPod Biofilter, the applicant must obtain Washington State Department of Ecology Technology Assessment Protocol General Use Level Designation certification and re-apply following submission guidelines in effect at the time of application.
More information on the product can be found on the manufacturer's product website.
Approved: February 2019 under the requirements of the 2016 Stormwater Management Manual.