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|Gravel for the underdrain should be clean and washed; no fines should be present in the material
|Gravel for the underdrain should be clean and washed; no fines should be present in the material
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|Underdrain pipe material should be perforated and of the correct size (when specified in design)
|Underdrain pipe material should be perforated and of the correct size (when specified in design)
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|A cap should be placed on the upstream (but not the downstream) end of the underdrain (when specified in design)
|A cap should be placed on the upstream (but not the downstream) end of the underdrain (when specified in design)
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|Biomedia should be tested to confirm that it meets specifications
|Biomedia should be tested to confirm that it meets specifications
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|Mulch composition should be correct
|Mulch composition should be correct