R2026-136 Resolution Authorizing Lake Decatur Watershed Farmland Conservation Program Agreement With Lynn Clarkson for a Bioreactor Drainage Water Treatment Structure

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I USDA Unite titres Natural Resources Conservation Service Department of Agriculture Operation&Maintenance Plan Denitrifying Bioreactor(Code 605) Expected Lifespan The minimum expected lifespan of this practice is at least 10 year(s). Follow the operation and maintenance plan below to keep your denitrifying bioreactor functioning as intended and to accomplish the water quality objectives: • For bioreactors that are designed to be kept at the same setting year round,the settings are: Upstream(diversion)structure: 41 inches below the top of the structure(55 inches above structure bottom.) This can be accomplished with 7-inch(x5),5-inch(x4) boards. Downstream(capacity)structure: 75 inches below the top of the structure(21 inches above structure bottom.) This can be accomplished with 7-inch(x3) boards. • For bioreactors that are designed for seasonal operation,manage water control levels according to the following plan. Use the recordkeeping table on the last page of this O&M plan to keep track of the operation. Stoplog setting Mode Begin Date Upstream(diversion) Downstream(capacity) structure structure Fallow Inches below the Inches below the (After fail harvest activities) top of the structure top of the structure Open (or 2 weeks before spring Fully open Fully open planting) Crop (or 2 weeks after the end of inches below the inches below the spring planting activities) top of the structure' top of the structure' Open (Two weeks before fall Fully open Fully open harvest) During extremely wet periods in the growing season,lower the stoplogs to the Open mode to prevent the water table from rising into the crop root zone. • When water is released from a water control structure,high velocity flow has the potential of damaging the tile line. To prevent damage,lower the water level in the structure gradually. This is most easily achieved by pulling all the boards up no more than 2 inches,resulting in a 2 inch gap at the bottom of the structure. • Inspect after significant storm events and at least twice a year to identify repair and maintenance needs. Monitor surrounding areas for signs of vegetation stress due to prolonged wetness. Contact NRCS if an adjustment in board settings may be necessary. • Check the valves for proper functioning.Lock structures when not in use to prevent tampering and/or vandalism.Promptly repair or replace damaged or inoperable components. • Remove debris that may accumulate on,around or immediately upstream or downstream from the installed structure. • Remove debris from any surface inlets to the drainage system,to prevent excessive clogging of the bioreactor flow path. Keep any surface inlets that are connected to the supply tile in good repair to minimize trash entry into the system. • Repair any settlement or erosion that occurs along buried pipes. If this problem persists,evaluate the pipe for leakage and erosion of the fill material into or along the pipe. • Eradicate or otherwise remove all rodents or burrowing animals.Immediately repair any damage caused by their activity. • Protect the bioreactor from damage by farm equipment and livestock. NRCS,IL O&M-Page 1 of 3 April 2021 (Xora Af1ICSON CEMETERY 200-BIO 12 r � aowrs�uer oVM/2Gae 9 I Jwmy.h•w 1�rrrin•� Jzrhmiy;v 01100110 WI • nwrnpcnusrnaunn OPERATION AND IMA1 (605) iwracv