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Basin F was constructed by the United States Army in 1956 at the Rocky Mountain Arsenal, to provide for the disposal of contaminated liquid wastes from the chemical manufacturing operations of the Army and its lessee Shell Chemical Company. As originally constructed, Basin F was equipped with a catalytically blown asphalt liner (approximately 3/8-inch (10 mm) thick) covered with a protective soil blanket. Basin F had a maximum capacity of and covered approximately . Throughout the operation of Basin F, the saline concentration increased as water evaporated. The liquid formerly stored in Basin F is very salty water that contains some metals, hydrazine, wastewater, and toxic organics, which are only about 1 percent of the liquid. ==Interim response== The Basin F Interim Response Action began in March 1988 and involved the transfer by tank truck of of Basin F liquid to three holding tanks and approximately to a double-lined holding pond. The Interim Response Action at Basin F was not without some major obstacles that caused delays and challenged the Army's engineers. In May 1988, near the start of the project, a heavy rainfall classified as a 25-year/24-hour event occurred which increased the volume of Basin F liquid. In June 1988, a tornado touched down near the tanks and ponds. The need to inspect and repair structures and equipment affected by the twister caused a minor schedule delay. The increased volume of liquid in Basin F caused by the heavy rainfall in May 1988 required additional storage capacity. Two double-lined holding ponds were constructed: a pond (Pond B) and an pond (Pond A). The of basin overburden, liner, and subsoils were excavated and placed in a waste pile located within the basin area. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Basin F」の詳細全文を読む スポンサード リンク
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