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Table 2. Timeline for Implementing Maintenance <br />Condition <br />Timeframe for Implementation <br />Maintenance of sediment barrier: <br />silt fence (SF), straw bale (StB), or <br />sediment control log (SCL) <br />Sediment should be removed when sediment <br />accumulation reaches one -half the designated <br />sediment storage depth, usually one -half the height <br />of the straw bale, silt fence, or sediment control log. <br />Move sediment to a location where it cannot wash <br />back into any ditches, drainages, or other receiving <br />waters. <br />Retrench any barrier that has been undercut. Fill in <br />and tamp down any gullies that have formed. <br />For silt fence: <br />1. Replace any broken or bent over stakes. <br />2. Inspect end posts of adjacent sections of silt <br />fence to make sure there is no gap between <br />them. Securely join the two sections <br />together if necessary. <br />3. Re- attach fence fabric as necessary. <br />Maintenance of check dams (CD): <br />sediment control log (CD -SCL), <br />straw bale (CD -StB), or rock <br />Sediment should be removed when it has <br />accumulated to one half of the original height of the <br />dam. Move sediment to a location where it cannot <br />wash back into any drainage, ditches, or other <br />receiving waters. <br />Re- entrench check dams that have been undercut. <br />Fill in and tamp down any gullies that have formed. <br />If the channel above or below the check dam is <br />eroding, it may be appropriate to install an <br />additional check dam in the eroded channel. <br />Alterations to a check dam may be needed it runoff <br />is bypassing the dam by flowing around the <br />structure. To stop the bypassing and any side <br />cutting, the ends of the check dam may need to <br />extend farther up the channel slope. Check that the <br />center of the dam is lower than the sides. <br />Maintenance of rock filter dam <br />(RFB) <br />Sediment should be removed when it has <br />accumulated to one half of the original height of the <br />dam. Replace the filter rock as is becomes clogged <br />with mud. <br />Animas Glacier SWMP February 2012 <br />p. 20 <br />