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*[https://owl.cwp.org/mdocs-posts/elc_pwp80/ Pollutant Dynamics of Pond Muck] - Schueler (2000) | *[https://owl.cwp.org/mdocs-posts/elc_pwp80/ Pollutant Dynamics of Pond Muck] - Schueler (2000) | ||
*[https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwiw7MWMz_jhAhUIlawKHSQTD5oQFjABegQIBBAC&url=https%3A%2F%2Frosap.ntl.bts.gov%2Fview%2Fdot%2F19525%2Fdot_19525_DS1.pdf%3F&usg=AOvVaw2YVEIn2s9ktI2uiiX-lf0B TESTING OF ULTRA-URBAN STORMWATER BEST MANAGEMENT PRACTICES] - Yu and Stopinski (2001) | *[https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwiw7MWMz_jhAhUIlawKHSQTD5oQFjABegQIBBAC&url=https%3A%2F%2Frosap.ntl.bts.gov%2Fview%2Fdot%2F19525%2Fdot_19525_DS1.pdf%3F&usg=AOvVaw2YVEIn2s9ktI2uiiX-lf0B TESTING OF ULTRA-URBAN STORMWATER BEST MANAGEMENT PRACTICES] - Yu and Stopinski (2001) | ||
+ | |||
+ | <noinclude> | ||
+ | ==Related pages== | ||
+ | *[https://igeowater.com/mpca/#/intro Pretreatment selection tool] | ||
+ | *[[Overview and methods of pretreatment]] | ||
+ | *Overviews for different types of pretreatment practices | ||
+ | **[[Overview for pretreatment settling devices]] | ||
+ | **[[Overview for pretreatment screens]] | ||
+ | **[[Overview for pretreatment vegetated filter strips]] | ||
+ | *Information for specific types of pretreatment practices | ||
+ | **[[Design, construction, operation and maintenance specifications for pretreatment vegetated filter strips]] | ||
+ | ** [[Pretreatment - Hydrodynamic separation devices]] | ||
+ | **[[Pretreatment - Screening and straining devices, including forebays]] | ||
+ | **[[Pretreatment - Above ground and below grade storage and settling devices]] | ||
+ | **[[Pretreatment - Filtration devices and practices]] | ||
+ | **[[Pretreatment - Other pretreatment water quality devices and practices]] | ||
+ | |||
+ | :To see the above pages as a single page, [[Pretreatment practices combined single page|link here]] | ||
+ | |||
+ | [[Pretreatment sizing for basins and filters strips]] | ||
+ | |||
+ | [[Guidance for managing sediment and wastes collected by pretreatment practices]] | ||
+ | |||
+ | '''Tables''' | ||
+ | *[[Pretreatment tables]] - link to tabled information for pretreatment practices | ||
+ | *[https://stormwater.pca.state.mn.us/index.php?title=Hydrodynamic_separator_tables_combined Hydrodynamic separator tables] | ||
+ | *[https://stormwater.pca.state.mn.us/index.php?title=Screening_and_straining_devices_tables_combined Screening and straining devices tables] | ||
+ | *[https://stormwater.pca.state.mn.us/index.php?title=Above_ground_and_below_grade_storage_and_settling_tables_combined Above ground and below grade storage and settling tables] | ||
+ | *[https://stormwater.pca.state.mn.us/index.php?title=Filtration_tables_combined Filtration tables] | ||
+ | *[https://stormwater.pca.state.mn.us/index.php?title=Other_water_quality_devices_tables_combined Other water quality devices tables] | ||
+ | |||
+ | '''Other information and links''' | ||
+ | *[[Pretreatment - Additional considerations]] | ||
+ | *[[Case studies for pretreatment]] | ||
+ | *[[References for pretreatment]] | ||
+ | *[[Links for pretreatment]] | ||
+ | *[[Definitions for pretreatment]] | ||
+ | *[[Supporting material for pretreatment]] | ||
+ | *[[Photo gallery for pretreatment]] | ||
+ | |||
+ | [[Category:Pretreatment]] | ||
+ | </noinclude> |
This discussion focuses on pretreatment practices. Pretreatment reduces maintenance and prolongs the lifespan of structural stormwater BMPs by removing trash, debris, organic materials, coarse sediments, and associated pollutants prior to entering structural stormwater BMPs. Implementing pretreatment devices also improves aesthetics by capturing debris in focused or hidden areas.
Because pretreatment practices remove material from stormwater runoff, they must be periodically cleaned to maintain their function. This page provides information on management of material collected in pretreatment practices, including disposal options.
For information on pretreatment, link here.
Below is a brief summary of the types of materials typically found in these practices.
The type of material collected in a pretreatment practice depends on the source of stormwater runoff. Primary constituents include sand, salt, leaves, and other litter and debris washed off streets, parking lots and sidewalks.
See the discussion below for results of sampling for materials collected by these practices.
There is limited information for sampling of sediments and other materials captured by pretreatment practices. The Excel spreadsheet below summarizes results from sampling studies. NOTE: This spreadsheet may be updated periodically and includes a date at the top of the spreadsheet.
File:Pretreatment sampling data.xlsx
In general, concentrations of metals and organic pollutants are below levels of concern. The following bullets summarize results for these studies.
Comparisons of results from these studies with Minnesota criteria, maximum concentrations of all metals except arsenic and lead are below industrial soil reference values.
Analysis of stormwater runoff and sediments collected by pretreatment practices indicate that "typical" concentrations of pollutants do not warrant testing and the material can be disposed at a permitted landfill.
The following steps are typically found in guidance for handling these materials.
Visual screening of water in a sump is recommended for the following.
For more information on screening, link here
Testing is recommended for the following.
The following links generally align with the section heading, although there may be some overlap at a specific site. For a summary of our literature review, [File:Pretreatment waste disposal literature review.docx link here].
Pretreatment sizing for basins and filters strips
Guidance for managing sediment and wastes collected by pretreatment practices
Tables
Other information and links