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→Wood derivatives
[[File:Sandy Bioretention Soil Mix.jpg|thumb|Sandy filter media mix.]]
[[File:Sandy Bioretention Soil Mix.jpg|thumb|Sandy filter media mix.]]
[[File:Media hand.jpg|thumb|Filter media being used for an online [[bioswale|bioretention swale]] (also of previous, more sandy specification)]]
{{TOClimit|2}}
{{TOClimit|2}}
!Blend B: Water quality priority
!Blend B: Water quality priority
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!Application
|Higher I/P ratio
|Higher I/P ratio
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*Improved [[heavy metals|metals]] and [[phosphorus]] retention.}}
*Improved [[heavy metals|metals]] and [[phosphorus]] retention.}}
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!Proportions
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3 parts [[sand]]<br>
3 parts [[sand]]<br>
2 parts [[topsoil]]<br>
2 parts [[topsoil]]<br>
1 part sand [[Bioretention: Filter media#Organic components|organic soil components]] and [[Bioretention: Filter media#Additives|additives]]
1 part sand [[Bioretention: Filter media#Organic components|organic soil components]] and [[Bioretention: Filter media#Additives|additives]]
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!
|This mixture may be assumed to have available water storage of [[Bioretention media storage|'''0.4''' unless demonstrated otherwise]]
|This mixture may be assumed to have available water storage of '''0.35''' unless demonstrated otherwise
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![[Texture]]
![[Texture]]
|<20 % fines||Hygrometer
|<15 % fines||Hygrometer
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|-
![[Organic matter]] (OM)
![[Organic matter]] (OM)
===Wood derivatives===
===Wood derivatives===
https://www.unh.edu/unhsc/sites/default/files/media/unhsc_bsm_spec_2-28-17_0.pdf
The 2017 guidance from New Hampshire specifically rules against the inclusion of compost in their bioretention media.<ref>UNHSC Bioretention Soil Specification. (2017). Retrieved from https://www.unh.edu/unhsc/sites/default/files/media/unhsc_bsm_spec_2-28-17_0.pdf</ref> Instead they recommend sphagnum peat or ''"Shredded wood, wood chips, ground bark, or wood waste; of uniform texture and free of stones, sticks"''. The use of wood chip has been common in New Hampshire for some time, in this 2006 thesis 20 % wood chips (not characterized) were incorporated into all of the test cases to match current practices at the time. <ref>Stone, R. M. (2013). Evaluation and Optimization of Bioretention Design for Nitrogen and Phosphorus Removal. University of New Hampshire. Retrieved from https://www.unh.edu/unhsc/sites/unh.edu.unhsc/files/STONE THESIS FINAL.pdf</ref>
https://www.unh.edu/unhsc/sites/unh.edu.unhsc/files/STONE%20THESIS%20FINAL.pdf
Shredded paper has been tested as an additional source of carbon and as an electron-donor to promote denitrification in a number of successful laboratory and field studies.
<ref>
==Additives==
==Additives==