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Table 2. Timeline for Implementing Maintenance <br />Condition <br />Timeframe for Implementation <br />Maintenance of stabilized <br />construction entrance (SCE) <br />When sediment has substantially clogged the void <br />area between the aggregate, either add new <br />aggregate on top of the existing surface or remove <br />the aggregate and collected soil material and <br />reconstruct the stabilized entrance. <br />Maintenance of outlet protection <br />(OP) -rock <br />Inspect after heavy rains to see if any erosion <br />around the structure has taken place or if any <br />stones have been dislodged. Immediately make all <br />needed repairs to prevent further damage. <br />Maintenance of concrete <br />washout pit <br />Remove hardened concrete on a regular basis to <br />provide more room for liquid wastes and dispose of <br />properly. Clean out the pit when 2/3 full and <br />dispose of the waste properly. Ensure that the <br />signage is up and visible to concrete drivers. <br />Maintenance of soil retention <br />blankets (SRB) <br />Inspect after significant rainstorm events for <br />erosion and undermining. Repair any failures <br />immediately. <br />Repair damage to the slope or channel if washout or <br />breakage has occurred. Re- install the blanket or <br />mat. Ensure that matting is uniformly in contact <br />with the soil; erosion can occur under the soil <br />retention blanket if it is not. Check that all lap joints <br />are secure. Check staples to make sure they are <br />flush with the ground. <br />Maintenance of sediment basin <br />(SB) <br />Sediment accumulated in the basin shall be <br />removed when sediment depth is one foot, i.e., 2 <br />feet below the spillway crest. Dispose of the <br />removed sediment in such a manner that it will no <br />erode from the site. The sediment shall not be <br />placed downstream from the embankment. <br />Maintenance of sediment trap <br />(ST) <br />Sediment accumulated upstream of rip rap shall be <br />removed when the upstream depth is within one - <br />half the height of the rip rap outlet structure. <br />Dispose of the removed sediment in such a manner <br />that it will not erode from the site. The sediment <br />shall not be placed downstream from the <br />embankment or in drainage. <br />Animas Glacier SWMP February 2012 <br />p. 22 <br />