Accepted Proprietary Devices 

Low impact development (LID) has been found to be feasible for nearly all development sites. However, if you believe LID design may be infeasible for part of or your entire development site, you should consult with municipal staff and seek additional technical assistance for incorporating LID into your site before considering non-LID options.

If infeasible to use LID to treat 100% of the runoff, the use of a Proprietary Stormwater Quality Device will be allowed that meets the following conditions for the drainage management area where LID is infeasible.

• The proposed BMP meets the Technology Assessment Protocol – Ecology (TAPE) General Use Level Designation (GULD)  Basic Treatment performance evaluation criteria for Total Suspended Solids (TSS) through a certified through third-party, field scale evaluation. An Active General Use Level Designation Basic Treatment under the Washington State Technology Acceptance Protocol-Ecology Tape program is an acceptable method of demonstrating that the performance standard has been met. The list of certified technologies is updated as new technologies are approved (link below).  Technology listed with Pilot Use Level Designation and Conditional Use Level Designation are not acceptable.

Refer to: http://www.ecy.wa.gov/programs/wq/stormwater/newtech/technologies.html

• The proposed proprietary stormwater quality device is designed and maintained consistent with its performance certifications.  The applicant must demonstrate that the proposed application of the proprietary stormwater quality device is consistent with the basis of its certification/verification.  Certifications or verifications issued by the Washington TAPE program are accompanied by a set of guidelines regarding appropriate design and maintenance conditions that would be consistent with the certification/verification.  It is common for these approvals to specify the specific model of proprietary stormwater quality device, design capacity for given unit sizes, type of media that is the basis for approval, maintenance frequency and/or other parameters.

• The proposed proprietary stormwater quality device is acceptable at the discretion of the Sacramento Stormwater Quality Partnership or any individual Partnership agency.  The applicant may be required to provide additional studies and/or required to meet additional design criteria beyond the scope of this document to demonstrate that criteria are met.  The Partnership will review any application for acceptance based on the current regulatory requirements.  If an application is rejected, the Partnership will provide a written explanation describing the rationale for the rejection of any proposed device(s).

• The Sacramento Stormwater Quality Partnership may at any time suspend or revoke approval of any proprietary stormwater quality device for future development projects. If the performance of the technology does not meet the performance criteria at the time the device was approved, or if the Partnership’s criteria changes due to local, state or federal requirements, or maintenance considerations, SSQP reserves the right to suspend or revoke approval of any device.  SSQP may also limit the approval of a device in certain applications, if field observations or operational experience support a change.

Technology Assessment Protocol – Ecology (TAPE) “General Use Level Designation (GULD)” is distinguished from a pilot or conditional use designation. Basic treatment is intended to achieve 80 percent removal of total suspended solids (TSS) for influent concentrations from 100 mg/L to 200 mg/L TSS and achieve 20 mg/L TSS for less heavily loaded influents.

Technologies previously accepted by the Sacramento Stormwater Quality Partnership not currently listed on the Washington TAPE approval list shall be honored.  This includes the Contech StormFilter with ZPG media with a treatment rate of 2 gpm/ft2, the Jensen PreCast Stormvault and the Filterra Tree In-a-Box.