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Scope of Work:
¨ Decommissioning and dismantlement of a 100’ long lead plating assembly line and support systems inside a battery production building.
¨ Prior to any decommissioning work, the entire building was placed under negative pressure using HEPA equipped air filtration systems. Routine air monitoring was performed inside and outside the production building to confirm proper containment of any lead bearing dust during project operations.
¨ Each piece of machinery was manually dismantled and loaded out using backhoes, forklifts, and related rigging equipment. All waste materials were loaded into roll-offs staged inside the building to prevent dust migration outside the building. The utilization of heavy equipment required that the work area be monitored for carbon monoxide emissions. Air exchange from the HEPA filtration system, exhaust lines, CO scrubbers, and propane-fueled equipment were all utilized to maintain safe CO levels throughout the project.
¨ Manual equipment dismantlement was generally performed with torches. Due to the presence of lead on the equipment surfaces, all hot work was performed in strict compliance with plant hot work permits. Personal protection included Level C PPE and air monitoring. Pre and post construction health monitoring confirmed successful implementation of the health and safety program with no exposures beyond OSHA limits.
¨ After the equipment was removed, decontamination activities were performed on the various concrete pads, pits, and mounts. Where contamination was found to be too extensive, the concrete was broken with a ramhoe and jackhammers and removed for disposal. Subgrade gravel and soil was also removed where necessary until confirmatory sampling indicated complete removal. Some floor excavations encountered groundwater, which was subsequently pumped to the wastewater treatment system (see below). All concrete penetrations were subsequently backfilled with crushed stone and capped with a minimum of 6” of reinforced concrete.
¨ Decontamination activities were also performed on the building structure itself including the floors, walls, and ceiling. All decontamination water generated during this phase was treated in the wastewater treatment system.
¨ The wastewater treatment system consisted of three 10,000 gallon tanks configured in series. The soluble lead was treated with a flocculant in the primary treatment tank. Tank 2 was used as an interim tank to allow confirmatory sampling and a secondary flocculant amendment if necessary. Tank 3 was used for storage pending confirmatory analysis.