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9 <br /> SCM element: Potential problem: How to remediate the problem: <br /> The bioretention cell: vegetation Best professional practices show Prune according to best professional practices and <br /> that pruning is needed to maintain to maintain lines-of-sight and allow sunlight to <br /> optimal plant health. reach the mulch surface. <br /> Plants are dead,diseased or dying. Determine the source of the problem: soils, <br /> hydrology,disease,etc. Remedy the problem and <br /> replace plants. Provide a one-time fertilizer <br /> application to establish the ground cover if a soil <br /> test indicates it is necessary. <br /> Tree stakes/wires are present six Remove tree stake/wires(which can kill the tree if <br /> months after planting. not removed). <br /> The bioretention cell: Mulch is breaking down or has Spot mulch if there are only random void areas. <br /> soils and mulch floated away. Replace whole mulch layer if necessary. Remove <br /> the remaining much and replace with triple <br /> shredded hard wood mulch at a maximum depth of <br /> three inches. <br /> Soils and/or mulch are clogged Determine the extent of the clogging-remove and <br /> with sediment. replace either just the top layers or the entire media <br /> as needed.Dispose of the spoil in an appropriate <br /> off-site location. Use triple shredded hard wood <br /> mulch at a maximum depth of three inches. Search <br /> for the source of the sediment and remedy the <br /> problem if possible. <br /> An annual soil test shows that pH Dolomitic lime shall be applied as recommended <br /> has dropped or heavy metals have per the soil test and toxic soils shall be removed, <br /> accumulated in the soil media. disposed of properly and replaced with new <br /> planting media. <br /> The underdrain system Clogging has occurred. Wash out the underdrain system. <br /> (if applicable) <br /> The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of the sediment <br /> off-site. <br /> The drop inlet is damaged Repair or replace the drop inlet. <br /> The receiving water Erosion or other signs of damage Contact the Town of Hillsborough Stormwater and <br /> have occurred at the outlet. Environmental Services Division at 919-296-9622 <br /> Page 4 of 6 <br />