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Below is a brief summary of the types of materials typically found in these practices. | Below is a brief summary of the types of materials typically found in these practices. | ||
− | * | + | *Catch basins. A catch basin is an inlet to a stormdrain system that typically includes a grate where stormwater enters the catch basin, and a basin to capture sediment, debris, and associated pollutants. They may also capture floatables and settle some solids. Catch basins act as pretreatment for other treatment practices by capturing large sediments. |
− | * | + | *Grit chambers and oil/grit separators: Grit chambers are tanks designed to slow down water flow so that solids will settle out of the water. Oil/grit separators are underground storage tanks with three chambers designed to remove heavy particulates, floating debris and hydrocarbons from stormwater. |
==Description of material captured== | ==Description of material captured== | ||
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In general, concentrations of metals and organic pollutants are below levels of concern. The following bullets summarize results for these studies. | In general, concentrations of metals and organic pollutants are below levels of concern. The following bullets summarize results for these studies. | ||
− | *[ | + | *[https://floridadep.gov/waste/permitting-compliance-assistance/documents/guidance-management-street-sweepings-catch-basin Florida Department of Environmental Protection] |
**Examined street sweepings and catch basins | **Examined street sweepings and catch basins | ||
**Upper 95% confidence limit concentrations for metals were below Florida criteria except for arsenic in catch basins; and iron, aluminum, and Beta-BHC in street sweepings and catch basins. | **Upper 95% confidence limit concentrations for metals were below Florida criteria except for arsenic in catch basins; and iron, aluminum, and Beta-BHC in street sweepings and catch basins. | ||
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===Catch basins=== | ===Catch basins=== | ||
− | *[https://www | + | *[https://www.iowadnr.gov/Portals/idnr/uploads/waste/swfact_streetsweepingspitwastefactsheet.pdf STREET SWEEPINGS/STORMWATER BASINS AND CAR WASH PIT DISPOSAL] - Iowa Department of Natural Resources |
− | *[https:// | + | *[https://danr.sd.gov/Environment/WasteManagement/SolidWaste/SumpWaste.aspx#:~:text=The%20State%20of%20South%20Dakota,disposing%20of%20sump%20pit%20wastes. Sump Waste Disposal Guidelines] - South Dakota Department of Environment and Natural Resources |
*[https://www.portlandoregon.gov/bes/article/149532 Maintaining Catch Basins] - City of Portland Environmental Services | *[https://www.portlandoregon.gov/bes/article/149532 Maintaining Catch Basins] - City of Portland Environmental Services | ||
*[https://www.mass.gov/files/documents/2018/03/09/catch-basins.pdf Management of Catch Basin Cleanings] - Massachusetts Department of Environmental Protection | *[https://www.mass.gov/files/documents/2018/03/09/catch-basins.pdf Management of Catch Basin Cleanings] - Massachusetts Department of Environmental Protection | ||
*[https://www.michigan.gov/documents/deq/wrd-stormwater-catch-basin-guidance_579858_7.pdf Catch Basin Cleaning Activities Guidance Document] - Michigan Department of Environmental Quality | *[https://www.michigan.gov/documents/deq/wrd-stormwater-catch-basin-guidance_579858_7.pdf Catch Basin Cleaning Activities Guidance Document] - Michigan Department of Environmental Quality | ||
*[https://www.florida-stormwater.org/assets/FSAEF/Research/StreetSweeping/pospaper_sediment.pdf Position Paper Street Sweeping, Stormwater Sediment and Catch Basin Disposal] - Florida Stormwater Association | *[https://www.florida-stormwater.org/assets/FSAEF/Research/StreetSweeping/pospaper_sediment.pdf Position Paper Street Sweeping, Stormwater Sediment and Catch Basin Disposal] - Florida Stormwater Association | ||
− | *[https:// | + | *[https://portal.ct.gov/-/media/DEEP/waste_management_and_disposal/solid_waste/streetsweepingspdf.pdf GUIDELINE FOR MUNICIPAL MANAGEMENT PRACTICES FOR STREET SWEEPINGS & CATCH BASIN CLEANINGS] - Connecticut Department of Environmental Protection |
− | *[https://www | + | *[https://www.wenatcheewa.gov/home/showpublisheddocument/4482/635978488755030000 Waste Disposal protocol] - City of Wenatchee |
===Grit chambers, hydrodynamic separators=== | ===Grit chambers, hydrodynamic separators=== | ||
− | *[ | + | *[https://www.dot.state.mn.us/environment/regulatedmaterials/guidance/grit-chamber.html Cleaning of Grit Chambers] - MnDOT Office of Environmental Stewardship Environmental Investigation Unit |
*[https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=22&cad=rja&uact=8&ved=2ahUKEwjOv9rBuPjhAhURUa0KHe3ICpEQFjAVegQIBBAC&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=22&cad=rja&uact=8&ved=2ahUKEwjOv9rBuPjhAhURUa0KHe3ICpEQFjAVegQIBBAC&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://nepis.epa.gov/Exe/ZyNET.exe/P1000ZQX.TXT?ZyActionD=ZyDocument&Client=EPA&Index=1995+Thru+1999&Docs=&Query=&Time=&EndTime=&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDay=&IntQFieldOp=0&ExtQFieldOp=0&XmlQuery=&File=D%3A%5Czyfiles%5CIndex%20Data%5C95thru99%5CTxt%5C00000021%5CP1000ZQX.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=1&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=hpfr&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x&ZyPURL# Stormwater O&M Fact Sheet] - EPA | *[https://nepis.epa.gov/Exe/ZyNET.exe/P1000ZQX.TXT?ZyActionD=ZyDocument&Client=EPA&Index=1995+Thru+1999&Docs=&Query=&Time=&EndTime=&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDay=&IntQFieldOp=0&ExtQFieldOp=0&XmlQuery=&File=D%3A%5Czyfiles%5CIndex%20Data%5C95thru99%5CTxt%5C00000021%5CP1000ZQX.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=1&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=hpfr&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x&ZyPURL# Stormwater O&M Fact Sheet] - EPA | ||
− | *[https://www | + | *[https://www.wenatcheewa.gov/home/showpublisheddocument/4482/635978488755030000 Waste Disposal protocol] - City of Wenatchee |
===Monitoring studies=== | ===Monitoring studies=== | ||
− | *[ | + | *[https://www.semanticscholar.org/paper/CHARACTERIZATION-OF-STREET-SWEEPINGS-%2C-STORMWATER-%2C-Townsend/4d6d864da21782a6cc8fb4b37caa321a21b597c8 EVALUATION OF ANALYTICAL DATA CHARACTERIZING STREET SWEEPINGS, STORMWATER SEDIMENTS AND CATCH BASIN SEDIMENTS] - Florida Department of Environmental Protection |
*[https://www.semanticscholar.org/paper/CHARACTERIZATION-OF-STREET-SWEEPINGS-%2C-STORMWATER-%2C-Townsend/4d6d864da21782a6cc8fb4b37caa321a21b597c8 CHARACTERIZATION OF STREET SWEEPINGS , STORMWATER SEDIMENTS , AND CATCH BASIN SEDIMENTS , IN FLORIDA FOR DISPOSAL AND REUSE Final Report] - Townsend, 2003. | *[https://www.semanticscholar.org/paper/CHARACTERIZATION-OF-STREET-SWEEPINGS-%2C-STORMWATER-%2C-Townsend/4d6d864da21782a6cc8fb4b37caa321a21b597c8 CHARACTERIZATION OF STREET SWEEPINGS , STORMWATER SEDIMENTS , AND CATCH BASIN SEDIMENTS , IN FLORIDA FOR DISPOSAL AND REUSE Final Report] - Townsend, 2003. | ||
*[https://www.ncbi.nlm.nih.gov/pubmed/20163826 Characterization of roadway stormwater system residuals for reuse and disposal options.] - Jang et. al,; Sci Total Environ. 2010 Mar 15;408(8):1878-87. | *[https://www.ncbi.nlm.nih.gov/pubmed/20163826 Characterization of roadway stormwater system residuals for reuse and disposal options.] - Jang et. al,; Sci Total Environ. 2010 Mar 15;408(8):1878-87. | ||
− | *[https://www. | + | *[https://www.semanticscholar.org/paper/CHARACTERIZATION-OF-STREET-SWEEPINGS-%2C-STORMWATER-%2C-Townsend/4d6d864da21782a6cc8fb4b37caa321a21b597c8 CHARACTERIZATION OF STREET SWEEPINGS, STORMWATER SEDIMENTS, AND CATCH BASIN SEDIMENTS, IN FLORIDA FOR DISPOSAL AND REUSE] - Florida Center for Solid and Hazardous Waste Management |
*[https://www.oregon.gov/deq/FilterDocs/phCatchBasinSedFS.pdf Portland Harbor: Characterizing and Managing Catch Basin and In-line Sediments] - Oregon Department of Environmental Quality | *[https://www.oregon.gov/deq/FilterDocs/phCatchBasinSedFS.pdf Portland Harbor: Characterizing and Managing Catch Basin and In-line Sediments] - Oregon Department of Environmental Quality | ||
*[https://www.sandiego.gov/sites/default/files/sdcatchbasinpilotstudy_final_060812_0.pdf Catch Basin Inlet Cleaning Pilot Study: Final Report] - City of San Diego | *[https://www.sandiego.gov/sites/default/files/sdcatchbasinpilotstudy_final_060812_0.pdf Catch Basin Inlet Cleaning Pilot Study: Final Report] - City of San Diego | ||
− | *[https:// | + | *[https://www.stormwatercenter.net/Library/Practice/80.pdf 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> | <noinclude> | ||
+ | |||
==Related pages== | ==Related pages== | ||
*[https://igeowater.com/mpca/#/intro Pretreatment selection tool] | *[https://igeowater.com/mpca/#/intro Pretreatment selection tool] | ||
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*[[Photo gallery for pretreatment]] | *[[Photo gallery for pretreatment]] | ||
− | [[Category:Pretreatment]] | + | [[Category:Level 2 - Best management practices/Pretreatment practices]] |
</noinclude> | </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
This page was last edited on 17 January 2023, at 15:00.