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Except for the ends, the difference in elevation between the highest and lowest point. along the top of the silt fence shall not exceed one-third the fence height. Posts should be spaced a maximum of 6 feet (1.9 m) apart and driven securely into the. ground a minimum of 30 inches (0.8 m).
DTp1 has, in theory, a maximum particle size of 37Â½mm, so using this 'rule of thumb', the min layer thickness would be 3Â½ Ã 2 = 75mm. If a fill layer or sub-base layer was using a 50mm crusher run material, then the minimum layer thickness/depth would be 50 Ã 2 = 100mm, and so on and so forth.ou should only exclude a sub-base if there is good reason to do so. So, if maximum particle size is x, then minimum layer thickness is 2x, as shown opposite. Conversely, if we know that we have space for only 50mm of fill material, then the maximum particle size would be 50 Ã· 2 = 25mm.