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Catawissa Tunnel
The Catawissa Tunnel is a mine drainage tunnel in Schuylkill County, Pennsylvania, in the United States. The tunnel discharges into Catawissa Creek further upstream than any other mine drainage tunnel in the watershed. The tunnel was constructed in the 1930s and a passive treatment system may or may not be installed at the site of the tunnel. The tunnel is several hundred feet long.
==Dissolved chemicals==
The concentration of iron in the water discharged from the Catawissa Tunnel is 1.01 milligrams per liter and the daily load of iron is . The iron load requires a 43 percent reduction to meet its total maximum daily load requirements. The concentration of manganese is 0.31 milligrams per liter and the load of manganese is per day. The load of manganese requires no reduction to meet its total maximum daily load requirements. The concentration of aluminum in the tunnel's waters is 1.27 milligrams per liter and the daily load is . The aluminum load requires a 69 percent reduction to meet its total maximum daily load requirements.〔 The concentrations of metals in the tunnel are lower than other mine drainage tunnels in the watershed of Catawissa Creek. Construction was planned to occur some time after 2010 if at all.〔
On April 15, 1975, the concentration of nitrogen in the form nitrates was measured to be 0.08 milligrams per liter in the waters of the Catawissa Tunnel. The concentration of organic carbon was measured to be 13.0 milligrams per liter.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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