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We invite you to comment on the draft wastewater permit for the The Amrize Midwest Inc. Nelson Sand and Gravel facility.
The Amrize Midwest Inc. Nelson Sand and Gravel facility mines, screens, and washes sand and gravel by open-pit methods, including a floating dredge, at average and maximum rates of 2.0 million and 2.5 million tons per year. Wastewater from this facility is created when Mississippi River water is used for washing aggregate from plant and conveyor leaks, stormwater from the plant and stockpile areas, and stockpile drain-tile water. After treatment this facility may discharge to Mooers Lake, a Mississippi River backwater, at SD 001, and to Baldwin Lake at SD 002 (shipyard discharge) and SD 003. The facility has a maximum design (MD) flow of 20.36 million gallons per day (mgd).
The draft water quality permit includes limits for total suspended solids (TSS) and pH, and monitoring for flow, nitrite plus nitrate, total kjeldahl nitrogen, total nitrogen and sulfate.
In conjunction with the reissuance of Amrize Midwest Inc-Nelson Plant wastewater permit, the MPCA is proposing to modify the South Metro Mississippi Turbidity TMDL total suspended solids waste load allocation, or the maximum load of pollutants each discharger of waste is allowed to release into a particular waterway, for this facility. The maximum load of pollutants in the TMDL, approved by the EPA in April 26, 2016, was 2,271 kg/day. The allocation was calculated using only the SD 001 maximum design flow. The correction will not result in an impairment for total suspended solids.
Wastewater from industrial and commercial sources may contain pollutants at levels that could adversely affect the water quality in area wetlands, streams, rivers, and lakes. Water quality permits - or National Pollutant Discharge Elimination System (NPDES) permits - establish specific limits and requirements to protect Minnesota's surface and groundwater quality. All wastewater must be treated before it goes into surface water to protect human health and aquatic life. Permits are regularly reviewed and updated as they expire, allowing the MPCA to incorporate new information about the impacts of pollutants on the environment in future permits.
We invite you to comment on the draft wastewater permit for the The Amrize Midwest Inc. Nelson Sand and Gravel facility.
The Amrize Midwest Inc. Nelson Sand and Gravel facility mines, screens, and washes sand and gravel by open-pit methods, including a floating dredge, at average and maximum rates of 2.0 million and 2.5 million tons per year. Wastewater from this facility is created when Mississippi River water is used for washing aggregate from plant and conveyor leaks, stormwater from the plant and stockpile areas, and stockpile drain-tile water. After treatment this facility may discharge to Mooers Lake, a Mississippi River backwater, at SD 001, and to Baldwin Lake at SD 002 (shipyard discharge) and SD 003. The facility has a maximum design (MD) flow of 20.36 million gallons per day (mgd).
The draft water quality permit includes limits for total suspended solids (TSS) and pH, and monitoring for flow, nitrite plus nitrate, total kjeldahl nitrogen, total nitrogen and sulfate.
In conjunction with the reissuance of Amrize Midwest Inc-Nelson Plant wastewater permit, the MPCA is proposing to modify the South Metro Mississippi Turbidity TMDL total suspended solids waste load allocation, or the maximum load of pollutants each discharger of waste is allowed to release into a particular waterway, for this facility. The maximum load of pollutants in the TMDL, approved by the EPA in April 26, 2016, was 2,271 kg/day. The allocation was calculated using only the SD 001 maximum design flow. The correction will not result in an impairment for total suspended solids.
Wastewater from industrial and commercial sources may contain pollutants at levels that could adversely affect the water quality in area wetlands, streams, rivers, and lakes. Water quality permits - or National Pollutant Discharge Elimination System (NPDES) permits - establish specific limits and requirements to protect Minnesota's surface and groundwater quality. All wastewater must be treated before it goes into surface water to protect human health and aquatic life. Permits are regularly reviewed and updated as they expire, allowing the MPCA to incorporate new information about the impacts of pollutants on the environment in future permits.
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