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13	13	= Primary =
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15		-The primary fraction is the fraction which is more than 50% of the same material. If this primary faction is anthropogenic the layer gets the name of the anthropogenic substance. The quality of the sample of the primary fraction needs to be QM5 and with organic soil QM4.
	15	+The primary fraction is the fraction which is more than 50% of the same material. If this primary faction is anthropogenic the layer gets the name of the anthropogenic substance. For the name of the primary fraction one can take a look at the category [[soil specification>>url:https://terrapedia.terraindex.com/index.php?title=Soil_specification&action=edit&redlink=1]]. The quality of the sample of the primary fraction needs to be QM5 and with organic soil QM4.
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17	17	== M50 ==
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35	35	= Tertiary =
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37		-This category is used for the indication of a strange or [[special component>>doc:Soil.Special components.WebHome]] present in the layer. In this category many residual materials are present, for example calcium and wood. The fraction present can range from 5 to 50%. At 5% > 25% of the same material one can speak of a weak presence of the material. At 25%>50% of the same material one can speak of a strong presence of the material. Organic components are not accounted in the tertiary category. For other materials present the samples need to be of at least class QM4. Further below some components are explained.
	37	+This category is used for the indication of a strange or [[special component>>url:https://terrapedia.terraindex.com/index.php/Special_component]] present in the layer. In this category many residual materials are present, for example calcium and wood. The fraction present can range from 5 to 50%. At 5% > 25% of the same material one can speak of a weak presence of the material. At 25%>50% of the same material one can speak of a strong presence of the material. Organic components are not accounted in the tertiary category. For other materials present the samples need to be of at least class QM4. Further below some components are explained.
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39	39	== AC 16 base/ AC 16-22 base ==
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