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<li>The coarse sand for LID construction shall be clean and free free of toxic materials.
<li>The coarse sand for LID construction shall be clean and free free of toxic materials.
<li>The pH of the sand shall be ≤ 7.0. <br> Manufactured sand from limestone or dolostone parent material is not acceptable.</li>
<li>The pH of the sand shall be ≤ 7.0. <br> Manufactured sand from limestone or dolostone parent material is not acceptable.</li>
<li>The coarse sand shall have a fineness modulus index between 2.8 and 3.1 according to ASTM C33/C33M, or otherwise the gradation below.</li>
<li>The coarse sand shall have a fineness modulus index between 2.8 and 3.1 according to [https://www.astm.org/Standards/C33| ASTM C33/C33M], or otherwise the gradation below.</li>
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