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Envirocon executed a contract for the Public Works division of the Army. The Building 64 RCRA Closure Project was located on the Rock Island Arsenal in Rock Island, Illinois. The base contract consisted of demolition and removal of hazardous and non-hazardous concrete and soil remediation. Building 64 was constructed in the late 1800s and served many functions for the military, most recently as a chrome plating facility. Work activities included the use of power washers and aerial lifts for washing the building interior, the removal of all interior concrete floors and pits, excavation of the contaminated soils, and the placement and compaction of backfill to original grade. The contaminants of concern in the concrete and soils were chromium and cadmium. The bulk of the project was completed in approximately 4 1/2 months. The final phase of the job, site restoration and reseeding, was completed in the spring of 2007.
Approximately 55, 000 square feet of wall surface area required pressure washing. About 10,000 linear feet of concrete was saw-cut to facilitate removal efforts producing 4,500 gallons of non-hazardous wastewater and 4,880 gallons of hazardous wastewater. Over 2,633 tons of non-hazardous contaminated concrete and 614 tons of hazardous contaminated concrete were removed and disposed. Envirocon excavated and disposed of 3,808 tons of contaminated soil and provided placement and compaction of 8,471 tons of backfill. Over 880 pounds of sodium lactate were placed in two separate areas and buried as directed by the engineer.
Several concrete pits and channels limited access within the building and created obstacles for equipment as well as ground personnel. Access doors to the building were small, which made it very difficult for equipment and trucks to enter and exit the building. A live service tunnel containing pressurized steam lines, electrical, communication, and fiber optic lines ran under the building through two areas requiring demolition and remediation work. The construction and age of the tunnel required engineered removal of concrete structures and careful removal of soils in order to avoid damaging the tunnel and its contents. Live high pressure steam and electrical utilities existed within the building at floor level and overhead as well. This also required special attention in order to avoid potential damage or personal injury. The building itself is a historical structure and was not to be damaged in any way. Finally, all material load out was required to take place within the building.
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