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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Planning Field and adjacent lands The overall planned area is 99.0 acres. The land is owned by Lynn Clarkson. The projected area of impact of the project is expected to have little to no effect on adjacent lands outside of the planning area. Crops and soils The cropping rotation consists of corn and soybeans. A complete soils description, including capability class,representative slope and drainage class are included in Table 1. Table 1.Soils summary of planned area Approximate Land Representative Saturated Hydraulic Drainage Soil Name Symbol Capability Slope Conductivity Class Acres Class (%) (inlhr,0-36 inches) (Dominant) Elburn silt loam,0 Somewhat to 2 percent 198A 38.7 1 1.0 1.3 poorly slopes drained Plano silt loam,2 to 5 percent 199B2 25.8 2e 3.5 1.3 Well drained slopes,eroded Drummer silty Poorly clay loam,0 to 2 152A 19.2 2w 0.5 1.3 drained percent slopes Proctor silt loam, 2 to 5 percent 148B2 14.2 2e 4.0 1.3 Well drained slopes,eroded Flanagan silt Somewhat loam,0 to 2 154A 0.8 1 0.9 1.0 poorly percent slopes drained Dana silt loam,2 — —--- --— Moderately to 5 percent 56B2 0.2 2e 4.0 1.3 slopes,eroded well drained Drummer-Milford silty clay foams,0 to 2 percent 7722A 0.1 2w 0.5 1 3 Poorly slopes,rarely drained flooded Topography and hydrology The planned area generally slopes from southeast to northwest. An existing grass waterway cuts through the west portion of the planned area and a roadside ditch(CR 950N)along the northern boundary. There do not appear to be any isolated surface depressions within the planned area. Based on SSURGO records,the Drummer silty clay loam soil types are classified as having frequent, brief shallow ponding. These concerns are likely to be alleviated by the existing subsurface drainage.No soil types within the planned area are classified as having flooding concerns. If not already completed by the local NRCS,an NRCS wetland determination should be completed prior to implementation. Existing or planned drainage and/or irrigation systems There is an existing subsurface drainage system in the planned area. Two submain drains parallel the existing grass waterway, culminating in an 12-inch corrugated plastic pipe(CPP)dual wall main drain, flowing west and paralleling the roadside ditch along CR 950N. The 12-inch CPP dual wall outlets to a headwall at the southeast corner of the intersection of CR 950N and CR 200E. Parallel 4-inch CPP laterals drain to the associated submains,spaced at approximately 100-ft spacing.A map of the existing subsurface drainage system is attached. No irrigation is currently planned for this field. Page 3 of 14