Changes

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!Application

!Application

|Impervious area to pervious area (I:P) ratio greater than 20:1

|Impervious area to pervious area (I:P) ratio of 15:1 or greater

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{{Plainlist|1=

{{Plainlist|1=

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!Porosity

!Porosity

|This mixture may be assumed to have a porosity of [[Bioretention media storage|'''0.4''' unless demonstrated otherwise]]

|This mixture may be assumed to have a porosity of [[Bioretention media storage|'''0.4''']] unless demonstrated otherwise

|This mixture may be assumed to have a porosity of '''0.35''' unless demonstrated otherwise

|This mixture may be assumed to have a porosity of [[Bioretention media storage|'''0.35''']] unless demonstrated otherwise

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Filter media should be obtained premixed from a vendor and meet all municipal, provincial and federal environmental standards. Mixing of sand, topsoil and compost should be done in a manner that preserves topsoil peds.

Filter media should be obtained premixed from a vendor and meet all municipal, provincial and federal environmental standards. Topsoil used to produce the mix should be passed through a 5 centimetre (2 inch) screen to remove large rocks, roots and other debris, while retaining soil peds. Samples of the filter media should be dried, ground and tested by a certified soil testing laboratory to ensure they meet the following specifications:

The mixture should be free of stones, stumps, roots, or other debris larger than 50 mm diameter. Samples of the filter media should be dried, ground and tested to ensure they meet the following specifications:

{|class="wikitable"

{|class="wikitable"

!Recommended test method

!Recommended test method

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![[Particle-size distribution]]

![[Grain size analysis| Particle-size distribution (PSD)]]

|< 25% silt- and clay-sized particles (smaller than 0.05 mm) combined; <br> 3 to 12% clay-sized particles (0.002 mm or smaller)||ASTM D7928, Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis.

|< 25% silt- and clay-sized particles (smaller than 0.05 mm) combined; <br> 3 to 12% clay-sized particles (0.002 mm or smaller)||ASTM D7928, Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis.

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![[Organic matter (OM)]]

![[Organic matter| Organic matter (OM)]]

|3 to 10% by dry weight||ASTM F1647, Standard Test Methods for Organic Matter Content of Athletic Field Rootzone Mixes.

|3 to 10% by dry weight||ASTM F1647, Standard Test Methods for Organic Matter Content of Athletic Field Rootzone Mixes.

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![[Phosphorus, plant-available]]

![[Phosphorus| Phosphorus, plant-available or extractable]]

|12 to 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>

|12 to 40 ppm||As measured by the 'Olsen' method for alkaline and calcareous soils (common in Ontario). Alternatives include 'Mehlich I or III', or 'Bray', which is better suited to acidic to slightly alkaline and non-calcareous soils. NB: Results from different test methods are not directly comparable.<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)| Cationic exchange capacity (CEC)]]

|> 10 meq/100 g||ASTM D7503, Standard Test Methods for Measuring the Exchange Complex and Cation Exchange Capacity of Inorganic Fine-Grained Soils.  

|> 10 meq/100 g||ASTM D7503, Standard Test Methods for Measuring the Exchange Complex and Cation Exchange Capacity of Inorganic Fine-Grained Soils.  

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![[Hydraulic conductivity, saturated (KSAT)]]

!Hydraulic conductivity, saturated (K_f)

|> 25 mm/h <br> < 300 mm/h||ASTM D2434, Standard Test Method for Permeability of Granular Soils (Constant Head), when the sample is compacted to 85% of its maximum dry density in accordance with ASTM D698, Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort.

|> 75 mm/h; Blend A <br> > 25 mm/h; Blend B <br> < 300 mm/h; Blend A and B||ASTM D2434, Standard Test Method for Permeability of Granular Soils (Constant Head), when the sample is compacted to 85% of its maximum dry density in accordance with ASTM D698, Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort.

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|Doesn't leach phosphorus||Must be imported

|Doesn't leach phosphorus||Must be imported

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!Wood chip

!Wood chips

|Doesn't leach phosphorus<br>Promotes nitrogen removal from water||

|Doesn't leach phosphorus<br>Promotes nitrogen removal from water||

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!Peat Moss

!Peat moss

|Doesn't leach phosphorus||Must be extracted from natural wetlands

|Doesn't leach phosphorus||Must be extracted from natural wetlands

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!Shredded paper (e.g., Pittmoss)

!Shredded paper (e.g., Pittmoss)

|Doesn't leach phosphorus<br>Promotes denitrification

|Doesn't leach phosphorus<br>Promotes denitrification

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===Wood derivatives===

===Wood derivatives===

==Additives==

==Additives==

Typically these components would make up 5- 10% by volume of the filter media mixture.  

Typically these components would make up 5 to 10% by volume of the filter media mixture.  

{{:Additives}}

{{:Additives}}

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