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I <br /> USDA United states Natural Resources Conservation Service <br /> Deportment of <br /> Agriculture <br /> Practice Specification <br /> Denitrifying Bioreactor(Code 605) <br /> Scope <br /> The work consists of constructing a denitrifying bioreactor as required by the construction plans. <br /> Utilities <br /> The landowner and/or contractor is responsible for locating all buried utilities in the project area,including <br /> drainage Ule and other structural measures. The landowner will obtain all necessary permissions from <br /> regulatory agencies,or document that no permits are required. <br /> General <br /> Carry out construction operations in a manner and sequence that erosion and air and water pollution are <br /> minimized and held within legal limits. <br /> The completed job must present a workmanlike appearance and conform to the line,grades,and <br /> elevations shown on the drawings or as staked in the field. <br /> Carry out all operations in a safe and skillful manner. Observe safety and health regulations and use <br /> appropriate safety measures. Contractor must be assured that all state laws concerning buried utilities <br /> have been met. <br /> Save documentation of materials used(geotextile tags,seed tags,photographs of pipe labeling,etc)and <br /> provide to NRCS. <br /> Remove all trees,stumps,roots,brush,weeds,and other objectionable materials from work area as <br /> designated on the plans. <br /> Excavation <br /> Excess spoil material must be placed,spread,leveled,shaped,or hauled away as shown on the <br /> construction plans or as staked in the field. Finish the completed job to a degree so the surface can be <br /> traveled with farm-type equipment unless otherwise specified in the construction plans. <br /> All excavations must conform to the lines,grades,elevations,bottom width,and side slopes shown on the <br /> construction plans or as staked in the field. <br /> Media Chamber <br /> Line the chamber with plastic after excavation and before adding the media. If a soil cap is to be <br /> constructed,use geotextile to separate the media from the soil. Geotextile must be non-woven,needle <br /> punched,meeting the minimum criteria shown in the plan. Plastic must have a minimum thickness of 4 <br /> mil. <br /> Carbon source media must be reasonably free of dirt,fines,and other contaminants. If wood chips are <br /> the media,the wood must not be treated or painted. Wood made from high tannin content species such <br /> as cedar or redwood is to be avoided. Oak chips may be used if mixed with other allowable wood <br /> species and do not constitute more than 50%of the mix. Avoid the use of sawdust,bark,leaf litter or <br /> other fine textured media in the wood chips. NRCS will reject any proposed wood chips with more than <br /> trace amounts of the prohibited materials. The contractor is advised to check with NRCS in advance for <br /> acceptance of the media to be used in the bioreactor. <br /> Spread the media evenly around the chamber. There must be no air pockets,bridging,or uneven surface <br /> of the media. Media must be placed in a manner that avoids damage to the distribution and collection <br /> pipes in the chamber. <br /> Mound the top surface of the media chamber with the material specified in the plans to allow for <br /> settlement of the media and to shed water. <br /> NRCS,IL SPECIFICATION-Page 1 of 4 April 2021 <br /> � <br /> # ora <br /> II € CL.AJ (S0N C IERY 200-BIO 12 �'�w�+'�'"� oVWxae <br /> ■� i oval is ute oyWa se <br /> 4• l Oy,teui <br /> ç,. ..P('� �\Clllltlt l• OOCIM It <br /> s u ith',C.,,..,n,u,,,, L NRCS 605 PRACTICE SPECIFICATION „R w <br />