| Autor: |
Buckler, James, Skelly, Thomas, Luepke, Michael, Wilken, Gary |
| Zdroj: |
Lake and Reservoir Management; July 1988, Vol. 4 Issue: 1 p143-152, 10p |
| Abstrakt: |
Lake Springfield is a 1,635 hectare reservoir located in central Illinois. The lake is important to the City of Springfield since it serves as a cooling lake for two municipal coal-fired power plants and is the chief water supply source for the area. Accumulation of 13 million cubic yards of sediment in the upper reaches of the lake threatened its adequacy to meet the City's future water supply requirements. Moreover, effects of agricultural runoff into the lake reduced recreational opportunities and contaminated several species of fish to the extent that the Illinois Environmental Protection Agency (IEPA) issued an advisory limiting their consumption. As a result, a three-phase, $9 million lake rehabilitation project was initiated consisting of shoreline stabilization, watershed soil conservation, and sediment removal. The major portion of the project required hydraulic removal of nearly 2.7 million cubic yards of sediment from the upper reaches of the lake. Unexpectedly, the possibly toxic nature of the dredged silt because of the presence of dieldrin and chlordane in the lake sediment, complicated approval of disposal site permits. Also, opponents claimed that the project was subject to Resource Conservation and Recovery Act (RCRA) regulation. It was demonstrated that concentrations of dieldrin and chlordane in the sediment were near detection limits and substantially below ambient levels found in farmland soils. The first phase of the project included development of a 79-hectare sediment retention site for removal of 1.2 million cubic yards of silt. Project costs for the first phase were $4.1 million, or $3.01 per cubic yard of dredged sediment. Early information gained from the project reinforced the need for extensive baseline data for material characterization to avoid project delays or unnecessary costs for similar projects. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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