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NTL Classification:NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;
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Abstract:From May 2009 through June 2010, Herrera Environmental Consultants conducted hydrologic
and water quality monitoring of a compost-amended biofiltration swale and a standard (control)
biofiltration swale in the median of State Route 518 for the Washington State Department of
Transportation. Herrera conducted this monitoring to obtain performance data that supports the
issuance of a General Use Level Designation (GULD) for the compost-amended biofiltration
swale from the Washington State Department of Ecology. This monitoring was performed in
accordance with procedures described in Guidance for Evaluating Emerging Stormwater
Treatment Technologies; Technology Assessment Protocol – Ecology (TAPE) (Ecology 2008).
This document is a technical evaluation report on the compost-amended biofiltration swale,
prepared by Herrera and based on results of the monitoring described above. The goal of this
report is to demonstrate satisfactory performance of the compost-amended biofiltration swale for
issuance of a GULD for basic, enhanced (dissolved metals removal) and oil treatment.
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