Since 1991, Barr has assisted a confidential client with its industrial landfill in the Ozark Plateau region of Missouri. The original landfill contains non-hazardous industrial waste and has operated since the 1970s. Barr prepared permitting documents for more than 500,000 cubic yards of vertical expansion capacity and eventually completed the closure and final cover construction as well as gas management and monitoring of this 40-acre landfill. The permitting activities consisted of waste characterization, detailed hydrogeologic evaluation, leachate investigation, groundwater modeling, engineering design, soil source report, and closure and post-closure care plans. Barr also designed and oversaw construction of an innovative leachate extraction system (LES). The landfill is currently in post-closure monitoring and has maintained continuous compliance for over five decades.
Barr provided additional assistance at this site by evaluating waste-disposal alternatives, providing stormwater management, rapid response to an extreme rainfall erosion event, NPDES Permitting support; performing several groundwater quality assessments, geophysical mapping, groundwater conceptual site model development, sampling, reporting, developing waste-management reporting systems, waste consolidation, gas management exclusion areas for gas monitoring, and negotiating permit conditions with the state of Missouri. Barr also developed a groundwater flow model that demonstrated that the leachate in the landfill would be reduced by the LES and would not impact groundwater.