Common use of POLLUTION CONTROL EQUIPMENT Clause in Contracts

POLLUTION CONTROL EQUIPMENT. Scrubber System The air pollution control facilities employed on Units #3 and #4 consist of a complete scrubber system, including duct work, plenums, scrubber vessels, reheaters and induced draft fans, together with infrastructures, monitoring and electrical controls and instrumentation therefore, for the purpose of removing the sulfur dioxide (SO2) and particulate matter from the flue gas. The scrubber system also includes a scrubber maintenance facility, including a machine shop and laboratory dedicated to the scrubber system and an environment monitoring laboratory for the pollution control facilities. The scrubber system utilizes the Wet Venturi Principle and consists of eight modules for each unit through which the steam generator gases from the burned coal must pass. The gases in the scrubber are contacted with finely atomized scrubber slurry. Within the stated performance of the system, fly ash particulates are removed by the slurry droplets. The sulfur dioxide reacts with the alkali contained in the slurry which results from the mixing of water, fly ash particulates, hydrated high calcium lime and hydrated dolomitic lime. A major portion of the sulfur dioxide is converted to solid sulfate compounds which are retained in the scrubber liquid and can, therefore, be piped to and deposited in an ash pond together with the particulate. After the flue gas passes through the venturi section, absorption sprays and wash trays, it is processed through a demister which removes any entrained slurry and is then reheated and discharged through the stack. The slurry system in the Units #3 and #4 scrubber system consists of recycle tanks, regenerators, agitators, pumps and pipelines. The slurry from the Units #3 and #4 scrubber system is transported to an effluent holding pond and involves the use of effluent holding tanks, agitators, pumps and pipelines. A separate wash tray pond System is used to store the suspended solids collected from the wash tray system. Reclaimed water from the clear water section of these ponds is circulated back to the scrubber system.

POLLUTION CONTROL EQUIPMENT. Scrubber System The air pollution control facilities employed on Units #3 and #4 consist of a complete scrubber system, including duct work, plenums, scrubber vessels, reheaters and induced draft fans, together with infrastructures, monitoring and electrical controls and instrumentation therefore, for the purpose of removing the sulfur dioxide (SO2) and particulate matter from the flue gas. The scrubber system also includes a scrubber maintenance facility, including a machine shop and laboratory dedicated to the scrubber system and an environment monitoring laboratory for the pollution control facilities. The scrubber system utilizes the Wet Venturi Principle and consists of eight modules for each unit through which the steam generator gases from the burned coal must pass. The gases in the scrubber are contacted with finely atomized scrubber slurry. Within the stated performance of the system, fly ash particulates are removed by the slurry droplets. The sulfur dioxide reacts with the alkali contained in the slurry which results from the mixing of water, fly ash particulates, hydrated high calcium lime and hydrated dolomitic lime. A major portion of the sulfur dioxide is converted to solid sulfate compounds which are retained in the scrubber liquid and can, therefore, be piped to and deposited in an ash pond together with the particulate. After the flue gas passes through the venturi section, absorption sprays and wash trays, it is processed through a demister which removes any entrained slurry and is then reheated and discharged through the stack. The slurry system in the Units #3 and #4 scrubber system consists of recycle tanks, regenerators, agitators, pumps and pipelines. The slurry from the Units #3 and #4 scrubber system is transported to an effluent holding pond and involves the use of effluent holding tanks, tanks agitators, pumps and pipelines. A separate wash tray pond System Lime Storage The sole purpose of the lime system is used to store supply the suspended solids collected from lime slurry requirements of the wash tray scrubber regeneration system. Reclaimed There is one lime system that serves the sixteen scrubbers for Units #3 and #4. Major components of the system include four slakers, in which calcined high calcium lime is reacted with water from to produce a hydrated lime slurry, slurry transfer tanks, where the clear water section of these ponds slurry is circulated back to diluted with water, slurry feed storage tanks, where the scrubber systemslurry will be held for use by the regenerators as needed, and agitators.

POLLUTION CONTROL EQUIPMENT. Scrubber System SCRUBBER SYSTEM The air pollution control facilities employed on Units #3 and #4 consist of a complete scrubber system, including duct work, plenums, scrubber vessels, reheaters and induced draft fans, together with infrastructures, monitoring and electrical controls and instrumentation therefore, for the purpose of removing the sulfur dioxide (SO2SO(2)) and particulate matter from the flue gas. The scrubber system also includes a scrubber maintenance facility, including a machine shop and laboratory dedicated to the scrubber system and an environment environmental monitoring laboratory for the pollution control facilities. The scrubber system utilizes the Wet Venturi Principle and consists of eight modules for each unit through which the steam generator gases from the burned coal must pass. The gases in the scrubber are contacted with finely atomized scrubber slurry. Within the stated performance of the system, fly ash particulates are removed by the slurry droplets. The sulfur dioxide reacts with the alkali contained in the slurry which results from the mixing of water, fly ash particulates, hydrated high calcium lime and hydrated dolomitic lime. A major portion of the sulfur dioxide is converted to solid sulfate compounds which are retained in the scrubber liquid and can, therefore, be piped to and deposited in an ash pond together with the particulate. After the flue gas passes through the venturi section, absorption sprays and wash trays, it is processed through a demister which removes any entrained slurry and is then reheated and discharged through the stack. The slurry system in the Units #3 and #4 scrubber system consists of recycle tanks, regenerators, agitators, pumps and pipelines. The slurry from the Units #3 and #4 scrubber system is transported to an effluent holding pond and involves the use of effluent holding tanks, agitators, pumps and pipelines. A separate wash tray pond System system is used to store the suspended solids collected from the wash tray system. Reclaimed water from the clear water section of these ponds is circulated back to the scrubber system.

POLLUTION CONTROL EQUIPMENT. Scrubber System SCRUBBER SYSTEM The air pollution control facilities employed on Units #3 and #4 consist of a complete scrubber system, including duct work, plenums, scrubber vessels, reheaters and induced draft fans, together with infrastructures, monitoring and electrical controls and instrumentation therefore, for the purpose of removing the sulfur dioxide (SO2) and particulate matter from the flue gas. The scrubber system also includes a scrubber maintenance facility, including a machine shop and laboratory dedicated to the scrubber system and an environment environmental monitoring laboratory for the pollution control facilities. The scrubber system utilizes the Wet Venturi Principle and consists of eight modules for each unit through which the steam generator gases from the burned coal must pass. The gases in the scrubber are contacted with finely atomized scrubber slurry. Within the stated performance of the system, fly ash particulates are removed by the slurry droplets. The sulfur dioxide reacts with the alkali contained in the slurry which results from the mixing of water, fly ash particulates, hydrated high calcium lime and hydrated dolomitic lime. A major portion of the sulfur dioxide is converted to solid sulfate compounds which are retained in the scrubber liquid and can, therefore, be piped to and deposited in an ash pond together with the particulate. After the flue gas passes through the venturi section, absorption sprays and wash trays, it is processed through a demister which removes any entrained slurry and is then reheated and discharged through the stack. The slurry system in the Units #3 and #4 scrubber system consists of recycle tanks, regenerators, agitators, pumps and pipelines. The slurry from the Units #3 and #4 scrubber system is transported to an effluent holding pond and involves the use of effluent holding tanks, agitators, pumps and pipelines. A separate wash tray pond System system is used to store the suspended solids collected from the wash tray system. Reclaimed water from the clear water section of these ponds is circulated back to the scrubber system. LIME STORAGE The sole purpose of the lime system is to supply the lie slurry requirements of the scrubber regeneration system. There is one lime system that serves the sixteen scrubbers for Units #3 and #4. Major components of the system include four slakers, in which calcined high calcium lime is reacted with water to produce a hydrated lime slurry, slurry transfer tanks, where the slurry is diluted with water and mixed with dry hydrated dolomitic lime, slurry feed storage tanks, where the slurry will be held for use by the regenerators as needed, hydrators, for mixing calcined dolomitic lime with water, and agitators. SCRUBBER SLUDGE DISPOSAL Effluent slurry is pumped from the plant to the sludge disposal pond located approximately three miles southeast of the plant. The suspended solids settle to the pond bottom and the clear water is pumped back to the plant. There are two phases in the development of this pond. The first phase requires the construction of one dam 108 feet high and 1,100 feet in length. A saddle dam must also be added. The saddle dam will vary in height with a maximum height for this phase of 36 feet and be approximately 2,800 feet in length. The capacity of Phase 1 will be 6,650 acre-feet and it will last approximately 10 years. The development of the second phase will require that the original dam be raised to 138 feet in height and increased to a length of 2,500 feet. The saddle dam will be raised to a maximum height of 66 feet and a total length of 3,500 feet. The capacity of the second phase will be an additional 7,000 acre-feet and it will last approximately 12 years, for a total life of 22 years. The construction of the second phase is not included in cost reported at this time. The sludge disposal pond design takes into account a permit requirement for minimum seepage, by providing low permeability plastic concrete filled trenches around the periphery of the pond constructed during the course of Phase 1 work. COAL DUST CONTROL SYSTEM The coal dust control system is designed to collect, store and treat coal dust resulting from mining, crushing, handling and storing coal in the course of normal Units #3 and #4 operations. To control coal dust air pollution the points where coal is transferred between conveyors or placed in coal piles have been enclosed. The coal transfer stations between conveyors are enclosed with steel framed structures with metal siding. The structures are equipped with vacuum filtration systems, consisting of ducts, blowers, dust removal filters and associated equipment, to remove coal dust from exhaust air from the structures, and are also equipped with mechanical dust collectors. The main line 45,000 ton coal storage pile is enclosed with a 340' long A-frame precast panel concrete structure designed to contain coal dust, thereby allowing its removal and treatment. COOLING TOWER DRIFT CONTAINMENT CONTROL FACILITY Operation of the cooling towers produces exhaust air emissions containing circulating water, particulates and other pollutants generally known as cooling tower drift. To control release of these air pollutants, the cooling towers are provided with high efficiency drift eliminators, located at the top of the cooling tower structures, which remove drift from the cooling tower exhaust air.

POLLUTION CONTROL EQUIPMENT. Scrubber System SCRUBBER SYSTEM The air pollution control facilities employed on Units #3 and #4 consist of a complete scrubber system, including duct work, plenums, scrubber vessels, reheaters and induced draft fans, together with infrastructures, monitoring and electrical controls and instrumentation thereforeinstrumentation, therefor, for the purpose of removing the sulfur dioxide (SO2) and particulate matter from the flue gas. The scrubber system also includes a scrubber maintenance facility, including a machine shop and laboratory dedicated to the scrubber system and an environment monitoring laboratory for the pollution control facilities. The scrubber system utilizes the Wet Venturi Principle and consists of eight modules for each unit through which the steam generator gases from the burned coal must pass. The gases in the scrubber are contacted with finely atomized scrubber slurry. Within the stated performance of the system, fly ash particulates are removed by the slurry droplets. The sulfur dioxide reacts with the alkali contained in the slurry which results from the mixing of water, fly ash particulates, hydrated high calcium lime and hydrated dolomitic lime. A major portion of the sulfur dioxide is converted to solid sulfate compounds sulfur components which are retained in the scrubber liquid and can, therefore, be piped to and deposited in an ash pond together with the particulate. After the flue gas passes through the venturi section, absorption sprays and wash trays, it is processed through a demister which removes any entrained slurry and is then reheated and discharged through the stack. The slurry system in to the Units #3 and #4 scrubber system consists of recycle tanks, regenerators, agitators, pumps and pipelines. The slurry from the Units #3 and #4 scrubber system is transported to an effluent holding pond and involves the use of effluent holding tanks, agitators, pumps and pipelines. A separate wash tray pond System system is used to store the suspended solids collected from the wash tray system. Reclaimed water from the clear water section of these ponds is circulated back to into the scrubber system.