2011-112 DEAPR - Hillsborough for Fairview Park Bio-Retention and Grassed Swale BMP Operation and Maintenance Agreement $n/a

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Bio-retention Basin Operation and Maintenance • Immediately after the bio-retention cell is established, the plants will be watered twice weekly if needed until the plants become established (commonly 6 weeks). • Snow, mulch or any other material wi1FNEVER be piled on the surface of the bio-retention cell. • Heavy equipment will NEVER be driven over the bio-retention cell. • Special care will be taken to prevent sediment from entering the bio-retention cell. • Once a year, a soil test of the soil media will be conducted. • Replace mulch annually as needed or at a minimum replace and/or add 2to 4 inches every 2 years. After the bio-retention cell is established, the property owner will inspect it once a month and within 24 hours after every storm event greater than 1.0 inches. Records of operation and maintenance will be kept in a known set location on the project site and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP Element: Potential Problem: How Property Owner Will Remediate the Problem: The Entire BMP Trash/Debris is present. Remove the trash/debris The Perimeter of the Bio- Areas of bare soil and/or erosive gullies Re-grade the soil if necessary to remove the retention Cell have formed. gully, and then plant a ground cover and water until it is established. Provide lime application onl . The Inlet Device: Pipe, Stone The pipe is clogged (if applicable). Unclog the pipe. Dispose of the sediment off- Verge or Swale site. The pipe is cracked or otherwise damaged Replace the pipe. if a licable . Erosion is occurring in the Swale (if Re-grade the Swale if necessary to smooth it applicable). over and provide erosion control devices such as reinforced turf matting or riprap to avoid future roblems with erosion. Stone verge is clogged or covered in Remove sediment and clogged stone and replace sediment (if a licable . with clean stone. The Pretreatment Area Flow is bypassing pretreatment area Re-grade if necessary to route all flow to the and/or gullies have formed. pretreatment area. Re-stabilize the area after radin . Sediment has accumulated to a depth Search for the source of the sediment and greater than 3 inches. remedy the problem if possible. Remove the sediment and re-stabilize the retreatment area. Erosion has occurred. Provide additional erosion protection such as- reinforced turf matting or riprap if needed to revent future erosion roblems. Weeds are resent. Remove the weeds, referabl b hand. The Bio-retention Cell: Best professional practices show that Prune according to best professional practices. Vegetation pruning is needed to maintain optimal lant health. Plants are dead, diseased or dying. Determine the source of the problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide lime application to establish the ground cover and other nutrients if a soil test indicates it is necessa Tree stakes/wires are present 6 months Remove tree stake/wires (which can kill the after lantin . trees if not removed . Page 2 of 4