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| 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]] |
| |- | | |- |
− | |This mixture may be assumed to have a porosity of [[0.4 unless demonstrated otherwise|Bioretention media storage]] | + | ! |
− | |This mixture may be assumed to have a porosity of 0.35 unless demonstrated otherwise | + | |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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| |- | | |- |
| ![[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. |
| |- | | |- |
| ![[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> |
| |- | | |- |
| ![[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. |
| |- | | |- |
| ![[Hydraulic conductivity]] | | ![[Hydraulic conductivity]] |
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| ===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. |
| + | <ref> |
| | | |
| ==Additives== | | ==Additives== |