Historical monitoring ofthe non-contact cooling water discharges show that those discharges have been within the pH range between 6.0 and 9.0 standard units (s.u.). The boiler blowdown, on the other hand, has been documented to have a pH as high as 11.9 s.u.. The pH ofthe boiler blowdown discharge is adjusted prior to entering the storage pond.
TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended,
PROCEDURES AND REQUIREMENTS FOR THE DISCHARGE OF WASTE…
boiler is secured. 1 Waste heat boiler bottom blowdowns can be conducted while the boiler is operating. The four boiler blowdown procedures are conducted in the following ways: • Surface blowdowns discharge approximately five percent of the total volume of water in the boiler. 4,5 During a surface blowdown, the water level in the boiler is
waters, including condensate, open loop geothermal well returns, boiler blowdown from non-chemically treated boilers, building and pavement power washing, stormwater, and swimming pool wastewater, may be authorized for discharge onto or into ground. Sufficient absorptive capacity must be available to avoid run-off. Discharge Permits
discharge, on a routine or frequent basis, of any toxic pollutant which is not limited in the permit, if that discharge will exceed the highest of the following "notification levels": i. One hundred micrograms per liter (100 ug/l); ii. Five (5) times the maximum concentration value reported for that pollutant
Discharges to surface water and groundwater: environmental
! low volume waste (floor drains, boiler blowdown, boiler seal water, laboratory wastewater, demineralizing and condensate waste water) and ! storm water. Under CWA §§ 301(a), 316 and 402, Canal Station's pollutant discharges and cooling water withdrawals must receive authorization from a National Pollutant Discharge Elimination System