KEMRON

Our Recent Projects

Crisp County Coal Combustion Residuals Remediation

KEMRON was contracted by the Crisp County Power Commission to close a coal combustion residuals (CCR) pond in Warwick, GA. This project involved comprehensive design and construction services to ensure safe and effective closure of the site. The project began with the preparation of an Erosion Sedimentation and Pollution Control Plan, which was submitted to the Local Issuing Authority and approved for a Notice of Intent for construction. Best Management Practices (BMP) for stormwater management included installing over 3,000 linear feet of double row silt fencing and a sedimentation basin. To control fugitive dust, KEMRON implemented dust suppression by maintaining appropriate moisture levels and spraying water as needed, along with onsite monitoring of dust levels.

Initially, 10 acres of organic content were removed from the surface material within the pond. Once the stripping operations were complete, the area inside the ash pond was prepared to spread out wet/saturated CCR, allowing it to decant, evaporate, and dry. A blending area and a ready-to-load-out stockpile area were also prepared. Onsite paint filter testing was conducted on CCR and blended materials prior to load-out and disposal to ensure compliance with landfilling criteria. Once the materials met disposal criteria, they were transported for off-site disposal at the Crisp County MSW landfill. Over 117,000 cubic yards of CCR were excavated and disposed of, followed by backfilling with over 20,000 cubic yards of clean material for site restoration. Project activities included 12,000 man-hours without a recordable incident.

KEMRON designed and implemented a wastewater treatment system (WWTS) to treat contact water pumped from the ash pond before discharging it into the Flint River, in compliance with the Georgia Environmental Protection Division NPDES Discharge Permit. The WWTS consisted of 42,000-gallon weir/equalization/sludge tanks, 800-gallon-per-minute suction and discharge pumps, 23 bag filtration units, a pH adjustment unit, 42,000-gallon effluent tanks, a coagulant/flocculent mix system, flow meters, a static mixer, and an aluminum chloride hydroxide sulfate flocculant mix. Water samples were collected from the effluent sampling point weekly and from the Flint River, tested, and submitted to the GA EPD through an online submittal system each month following the sampling period, in accordance with the NPDES Permit.

In addition to the CCR pond closure, KEMRON was contracted to close the Crisp County municipal solid waste landfill in Georgia. Preliminary activities included a comprehensive visual inspection of the landfill surface, side slopes, and adjacent areas. This inspection identified waste, assessed the condition and type of any cap material, detected seeps or leachate outbreaks, and evaluated erosion and drainage pathways. Additionally, landfill control features, including methane monitoring systems, vents, and groundwater monitoring wells, were examined along with environmentally sensitive natural resources.

KEMRON delineated the waste boundaries and assessed the thickness of the existing cover soils through test pits and borings. This evaluation produced a detailed waste limit survey and accurate legal descriptions of both the waste footprint and the property boundary. Using these survey results, KEMRON developed a Construction Quality Assurance (CQA) Plan, Construction Specifications, and Closure and Post-Closure Care Plan Drawings. These documents detailed the construction of a 24-inch thick final cover system, consisting of a 12-inch soil infiltration layer and a 12-inch final soil cover. The plans also included closure and post-closure care construction drawings.

The groundwater and methane monitoring network was inspected according to the Water Well Standards Act. This inspection included analyzing the location and construction details of all onsite groundwater receptors and delineating groundwater receptors within half a mile of the landfill property boundary.

KEMRON completed the construction of the 24-inch thick final cover system and prepared an Erosion, Sedimentation, and Pollution Control Plan. Best Management Practices (BMPs), including 4,000 linear feet of double row silt fencing and a sedimentation basin, were installed to control erosion. The project involved regrading 16,000 cubic yards of the 10-acre landfill to promote positive drainage and prepare it for the cover system. Additionally, 42,000 cubic yards of clean backfill material were imported, placed, and compacted over the waste mass. Erosion control matting and vegetative cover were installed to complete the project and achieve a notice of completion.

KEMRON’s comprehensive approach ensured that both the CCR pond and the municipal solid waste landfill closures met all regulatory requirements, protected the environment, and provided long-term care and monitoring solutions.

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