Guidance for Improving Monitoring and Analysis Methods for Stormwater-borne Solids

A large portion of impaired waterways are located in or near urban areas and are adversely influenced by stormwater-borne solids. The current methods in the United States for sampling, handling, and analyzing stormwater solids do not lead to a good understanding of these effects on receiving waters. Common definitions and standardized analytical procedures are recommended in this report to aid in understanding solid impacts and selection of stormwater best management practices. Stormwater solids can first be classified based on size into Dissolved, Fine, Coarse and Gross Solids. These solids can further be classified as settleable or suspended by allowing a settling time in the analytical procedure. An improved analytical protocol is recommended in order to standardize research and stormwater monitoring efforts.

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