A wastewater treatment plant odor event occurs when odors
released from the wastewater treatment plant site are easily
recognized by the average person and reported to Regional San
No more than 8 wastewater treatment plant odor events per year.
This service level reflects the effectiveness of our odor control
equipment and practices at the wastewater treatment plant.
A wastewater treatment plant odor event can be caused by the
failure or over exceeding the capacity of odor control equipment;
process upsets; overloading the solids storage basins; inadequate
injection of solids under the soil at the dedicated land disposal
facilities; scheduled maintenance of process equipment (prolonged
diversion of wastewater to emergency storage basins); failing to
adequately clean emergency storage basins; and uncovering
wastewater tanks, vaults or manholes for prolonged periods. These
events can also be caused by the Biosolids Recycling Facility and
are highly influenced by weather conditions.
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