Temperature - European Investment Bank

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WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD. Mount Coffee HPP ESIA and RAP 2012-09-18 ESIA Report Page 142 Issue Project component Impact Mitigation measures Related Sub Monitoring and Management Plans (S-MMP) Construction area, quarries, burrows and dumping areas Contamination of soil The maintenance of machinery and lorries has to be done in workshops, liquids including cleaning water should be collected in tanks. Storage of fuel and lubricants has to be in tight containers placed on sealed surfaces undernice a roof. The storage has to be equiped with all safety measures to prevent oil spilling including fire fighting equipment. The area needs to be marked. In the case of an oil spill sufficient quantities of oil absorbent have to be stocked. The contaminated absorbent has to be disposed of properly. Hazardous waste has to be stored in designated closed tanks or areas. Solid waste generated during construction and at campsites will be properly treated and safely disposed of only in demarcated waste disposal sites. All activities which could contaminate the soil have to be carried on a sealed surface and if accidental spillage occurs that the contaminated soil has to be excavated and disposed properly. Awareness has to be raised within the workforce to properly dispose of the waste. Climate Reservoir Not required No S-MMP Hydrology Dam, reservoir, turbine operation; reservoir filling Small impact due to change of water discharge pattern A minimum of 8 m³/s should be released from the spillway structure as the required residual flow. The possibility of installing a small unit at the spillway for turbining this water should be investigated (for technical and economic feasibility). This would reduce the loss in energy production due to allocating this residual flow, and it might be possible to use the energy generated there for electrification of the surrounding villages. A preliminary analysis shows that this would have an overall positive effect. EH&S Management and Monitoring of the Contractor Equipment Maintenance Management Plan Wastewater Management Plan Waste Management Plan Pollutant Spill Contingency Plan
WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD. Mount Coffee HPP ESIA and RAP 2012-09-18 ESIA Report Page 143 Issue Project component Impact Mitigation measures Related Sub Monitoring and Management Plans (S-MMP) Water quality Reservoir Change from river to lake ecosystem. Water quality Construction activities Possible greenhouse gas emission Increased load in suspended solids stemming from the construction site. Contamination with concrete, resulting in a higher pH which could potentially be toxic for fish. Contamination with hydrocarbons (fuel, lubricants etc.) and other toxic substances used on site. Contamination with human waste from the worker's camp. Cutting of trees which can be used, either for timber or for producing charcoal. The local population should be encouraged to use all timber resources within the reservoir to the extent possible. Cutting and burning of all trees which cannot be used, before impoundment to reduce obstacles and dangers for boats and fishing gear. Shortly before impounding cutting of as much vegetation as possible, and burning it. In general all equipment, machinery, trucks and camp installations have to be located in a distance of more than 250 m to water used for human consumption and at least 150 m to any body of surface water. Strict measures must be taken to prevent oil pollution of the river. The most important are: � Storage of fuel and lubricants away from the river, in tight containers placed on sealed surfaces. � Storage areas shall be designed such that they will contain 110 % of the largest container/ vessel stored in the storage area and waterproof; have available on site equipment and materials to execute clean-up (sufficient absorband). � Good maintenance of vehicles and machines to prevent oil losses. � No cleaning or maintenance of vehicles or machines in close proximity to the river. This must be done on specially prepared places (workshops) equipped with oil skimmers. Unnecessary dangerous chemicals and/or toxic substances are forbidden to use. Do not install a deposit even for uncontaminated gravel from the quarry near any body of surface water All the water draining down from the quarry needs to be lead to sedimentation and neutralisation tanks and has to be treated before releasing it to the river. All the waters from the batching plants, the concrete mixer washing facilities and the crusher plants needs to be collected and treated before releasing to the environment. Waste water from the camp site must be collected in portable latrines or septic tanks and has to be treated before releasing into a river. Water Quality Management Plan during operation Waste Water Management Plan during operation Waste Management Plan during Operation EH&S Management and Monitoring of the Contractor Equipment Maintenance Management Plan Wastewater Management Plan Waste Management Plan Pollutant Spill Contingency Plan
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Temperature - European Investment Bank

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