Siting and Monitoring of Waste Facilities Projects
Countywide Landfill: We completed a hydrogeologic investigation to support a PTI Application for an expansion that was approved by Ohio EPA to an existing site in northeastern Ohio. The permitted site was 88 acres and the expansion area was 170 additional acres (70,300,000 cubic yards). The geologic setting included a Pennsylvanian-age coal sequence with overlying surface mine spoils. In order to demonstrate conformance to siting criteria and to characterize the hydrogeology, we used data from a total of 216 borings. There were 10 continuous rock coreholes and packer tests were performed at six locations. There were 18 piezometers installed within the expansion footprint, and 16 slug tests and 10 short-term pumping tests were performed. The landfill floor was placed on a bedrock aquitard and we worked closely with the design engineers to integrate hydrogeologic and geotechnical characterization into the final design. The Permit was appealed by a citizen's group and we provided expert testimony in a hearing in support of the landfill. The Director's approval was affirmed by the appeals commission. We continue to perform semiannual groundwater monitoring and reporting for the site.
Stony Hollow Landfill: This project involved a hydrogeologic investigation of a greenfield site for a proposed solid-waste landfill in Dayton, Ohio in an area of glacial geology overlying Silurian bedrock. The site is located on an upland area adjacent to a buried valley aquifer which is classified as a Sole Source Aquifer. The primary siting issue was the question of whether or not part of the landfill was above an unconsolidated deposit which could produce 100 gpm at locations within 1,000 feet of the footprint. The depth to bedrock varied considerably across the site and deepened toward the buried valley. A seismic survey was performed to define the bedrock configuration and several test holes were drilled off site to determine the hydraulic properties of unconsolidated deposits within 1,000 feet of the footprint. Pumping tests also were performed and computations were made that demonstrated the materials would not produce 100 gpm. The results verified that the siting criteria were met. Separately, site design required extensive excavation and reconstruction beneath part of the footprint and a groundwater control system to handle seepage from the upgradient side. We developed a groundwater flow model to evaluate inflows and worked closely with the engineering firm during the final design. The site was successfully permitted and we have provided consultation during construction activities, subsequent expansion, and we continue to perform semiannual groundwater monitoring and reporting for the site.
Carbon Limestone Landfill: Eagon & Associates was hired to resolve compliance issues, maintain the existing groundwater monitoring program, complete an assessment investigation, and conduct a hydrogeologic site investigation in support of a 49 million cubic yard landfill expansion Permit-to-Install (PTI). The site is located in a limestone strip mine with complex hydrogeology. Eagon completed the assessment rate and extent investigation, prepared an exemption request, and resolved Ohio EPA concerns regarding landfill siting and the expansion PTI Application was approved. The permit application included several unique features including a 2,200 foot long groundwater collection trench connected to a four acre groundwater treatment wetland, as well as an 18,000 foot long passive drainage system that controls groundwater levels by passive flow into a reconstructed mine cut. Eagon also interacted with Ohio EPA to complete the corrective measures program for the site that incorporates the design features in the PTI.
American Landfill: This project involved a hydrogeologic investigation to support an expansion PTI application that was approved by Ohio EPA for an existing site in northeast Ohio. In addition to the extensive site investigation, we provided expert testimony during an ERAC appeal in which the Director's decision to approve the permit was subsequently affirmed. The expansion was for an 84,401,358 cubic yard expansion to an existing 234 acre (37,205,184 cubic yards) permitted landfill. The investigation consisted of 60 borings (including rock core, soil borings, monitoring wells, and piezometers), yield testing, pumping tests, slug tests, and packer testing; and redefining the Uppermost Aquifer System. We continue to provide semiannual groundwater monitoring and reporting services for the site.
Geneva Landfill: Eagon & Associates completed a hydrogeologic investigation to support a PTI Application for an expansion to an existing site in northeastern Ohio. The PTI application was approved by Ohio EPA and added an additional 14,300,000 cubic yards to the previously permitted 48.6 acres (6,100,000 cubic yards). The investigation was conducted to characterize the geology and hydrology of the expansion area and determined that the expansion area was suitable for permitting as a solid-waste disposal facility. A total of 35 borings were drilled as part of the investigation and included piezometers and monitoring wells. Hydraulic properties were determined from the borings by conducting numerous slug tests and pumping tests. We continued to work with the design engineers to integrate hydrogeologic and geotechnical characterization into the final design. The characterization of groundwater quality in the expansion area was accomplished for permitting purposes with sample collection from 38 monitoring wells and evaluation of that data. We continue to perform semiannual groundwater monitoring and reporting for the site.
Powell Road RI/FS: This project involved responsibility for the hydrogeologic requirements of a RI/FS at a Superfund site near Dayton, Ohio. The work scope included installation of 22 monitoring wells and seven piezometers, site characterization, sampling of 39 on and off-site wells (including 29 residential wells), and completion of the RI report. Eagon & Associates developed the hydrogeologic components of the sampling and analysis plan and supervised all of the drilling and sampling. The drilling program lasted about three months and included as many as three rigs on site. The extent and migration rate of contamination were determined and a risk assessment was completed. A groundwater flow model was used to develop water budgets and remediation plans. The Ohio EPA and USEPA accepted the proposed decision in the ROD. Five-year reviews have been accepted by USEPA and concentrations of parameters of concern have been decreasing. We continued to perform O&M monitoring activities at the Site.
Montgomery County Ash Monofill: Eagon & Associates has provided hydrogeologic consulting services regarding the Montgomery County Ash Monofill. Eagon has performed numerous tasks related to characterizing, monitoring, reporting, and remediating groundwater at the facility. The facility is located in a glaciated outwash terrace setting adjacent to the Great Miami River and a major metropolitan water-supply wellfield in a Sole Source Aquifer. The facility has been monitored under each of the Ohio EPA solid-waste regulatory programs including detection, assessment, and corrective measures. Eagon performed assessment and remedial investigations at the facility before conceptualizing and implementing the existing corrective measures groundwater extraction system. Eagon is responsible for groundwater monitoring and reporting, in addition to monitoring and maintaining the groundwater extraction system. The project requires ongoing multi-agency coordination with Montgomery County Solid Waste Services, Montgomery County Environmental Laboratory, Montgomery County Environmental Services, and the City of Dayton – Water Supply and Treatment.
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