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BR Ponding Area Examine the entire Bioretention surface and side slopes Problem (Check if Present) Follow-Up Actions Try filling the eroded areas with clean topsoil or sand, and cover with mulch. If the problem recurs, you may have to use stone (e.g., river cobble) to fill in problem areas. If the erosion is on a side slope, fill with clay that can be compacted and seed and mulch the area. Other: There is erosion in the bottom or on the side slopes. Water seems to be carving out rills as it flows across the Bioretention surface or on the slopes, or sinkholes are forming in certain Kick-Out to Level 2 Inspection: The problem persists or the erosion is more areas. than 3-inches deep and seems to be an issue with how water enters and Source: Stormwater Maintenance, LLC. moves through the Bioretention cell. Kick-Out to Level 2 Inspection: The problem does not seem to be caused by flowing water, but a collapse or sinking of the surface (e.g., “sinkhole”) due to some underground problem. If the problem is minor (just small, isolated areas are not covered with water), try raking the surface OR adding mulch to low spots to create a more level surface. You may need to remove and replace plantings in order to properly even off the surface. Check the surface with a string and bubble level to get the surface as flat as possible. Other: Kick-Out to Level 2 Inspection: Ponding water is isolated to less than half The bottom of the Bioretention cell is not flat, of the Bioretention surface area, and there seem to be elevation and the water pools at one end, along an differences of more than a couple of inches across the surface. edge, or in certain pockets. The whole bottom is not uniformly covered with water. See design plan to verify that bioretention surface is intended to be flat. Check during or immediately after a rainstorm. Page 5 of 8 Page 290 of 359