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<li>Soil laboratory reports shall certify the material to be suitable for re-use on residential, parkland, institutional, industrial, commercial, or community landscapes for the germination of seeds and the support of vegetative growth.</li>
<li>Soil laboratory reports shall certify the material to be suitable for re-use on residential, parkland, institutional, industrial, commercial, or community landscapes for the germination of seeds and the support of vegetative growth.</li>
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The factors to consider in determining a suitable soil mix for a vegetated stormwater practice include the following:
Specify that topsoil must be friable, neither heavy clay nor of a very light sandy nature.
An example of sandy loam topsoil is
*60 % sand,
*25 % silt,
*10 % clay,
*organic matter 5 %, and
*pH value of 6 - 7.5.
Topsoil must be capable of sustaining vigorous plant growth and to be free from subsoil, roots, vegetation, debris, toxic materials and stone over 50 mm diameter. Specify that topsoil sample must be provided to the consultant for testing and analysis including herbicide or atrazine content. All topsoil supplied must conform to a sample provided. Minimum topsoil depth is 150 mm for turf areas and ranging to 1.25 m for perennials, shrubs and trees.
[[category: materials]]
[[category: materials]]