Changes

[[File:Sandy Bioretention Soil Mix.jpg|thumb|Sandy filter media mix.]]

[[File:Sandy Bioretention Soil Mix.jpg|thumb|Sandy filter media mix.]]

{{TOClimit|2}}

{{TOClimit|2}}

!Blend B: Water quality priority

!Blend B: Water quality priority

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|Application

!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

!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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![[Organic matter]] (OM)

![[Organic matter]] (OM)

|5 - 10 %||ASTM D2974-14, Standard test methods for moisture, ash and organic matter of peat and other organic soils.

|5 - 10 %||ASTM F1647, Standard test methods for organic matter content of athletic field rootzone mixes.

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![[Phosphorus]]

![[Phosphorus]]

|12 - 40 ppm||As measured by the 'Bray' method. Alternatives include 'Mehlich I or III', or 'Olsen'. Results from these are not directly translatable.<ref>Sawyer JE, Mallarino AP. Differentiating and Understanding the Mehlich 3, Bray, and Olsen Soil Phosphorus Tests 1. http://www.agronext.iastate.edu/soilfertility/info/mnconf11_22_99.pdf. Accessed August 1, 2017.</ref>

|12 - 40 ppm||As measured by the 'Olsen' method for alkaline and calcareous soils (common in Ontario). Alternatives include 'Mehlich I or III', or 'Bray', better suited to acidic to slightly alkaline and non-calcareous soils. Results from these are not directly translatable.<ref>Sawyer JE, Mallarino AP. Differentiating and Understanding the Mehlich 3, Bray, and Olsen Soil Phosphorus Tests 1. http://www.agronext.iastate.edu/soilfertility/info/mnconf11_22_99.pdf. Accessed August 1, 2017.</ref>

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![[Cationic exchange capacity(CEC)]]

![[Cationic exchange capacity(CEC)]]

|10 meq/100 g||ASTM D7503-10, Standard test method for measuring the exchange complex and cation exchange capacity of inorganic fine grained soils.  

|10 meq/100 g||ASTM D7503-10, Standard test methods for measuring the exchange complex and cation exchange capacity of inorganic fine grained soils.  

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![[Hydraulic conductivity]]

![[Hydraulic conductivity]]

===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

 

https://jbioleng.biomedcentral.com/articles/10.1186/s13036-017-0057-4 (focus on denitrification)

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.

==Additives==

==Additives==