Permits, Records, and Reports - Wastewater Operators - page 410

average hourly limitation —The highest allowable average for a
60-minute period, calculated by adding all of the values measured
during the period and dividing the sum by the number of values
determined during the period.
average monthly limitation —The highest allowable average over a cal-
endar month, calculated by adding all of the daily values measured
during the month and dividing the sum by the number of daily val-
ues measured during the month.
average weekly limitation —The highest allowable average over a cal-
endar week, calculated by adding all of the daily values measured
during the calendar week and dividing the sum by the number of
daily values determined during the week.
daily discharge— The discharge of a pollutant measured during a cal-
endar day or any 24-hour period that reasonably represents the cal-
endar for the purpose of sampling. For pollutants with limitations
expressed in units of weight, the daily discharge is calculated as
the total mass of the pollutant discharged over the day. For pollut-
ants with limitations expressed in other units, the daily discharge
is calculated as the average measurement of the pollutant over the
day.
discharge monitoring report —Forms used to report self-monitoring
results of the permittee.
discharge permit —State Pollutant Discharge Elimination System
(SPDES) permit that specifies the terms and conditions under which
a point source discharge to state waters is permitted.
effluent limitation —Any restriction by the state board on quantities,
discharge rates, or concentrations of pollutants discharged from
point sources into state waters.
maximum daily discharge —The highest allowable value for a daily
discharge.
maximum discharge —The highest allowable value for any single
measurement.
minimum discharge —The lowest allowable value for any single
measurement.
Point source— Any discernible, defined, and discrete conveyance,
including but not limited to any pipe, ditch, channel, tunnel,
conduit, well, discrete fissure, container, rolling stock, vessel,
or other floating craft from which pollutants are or may be dis-
charged. This definition does not include return flows from irri-
gated agricultural land.
11.2 nPdes PerMiTs
In the United States, all treatment facilities that discharge to state
waters must have a discharge permit issued by the state water control
board or other appropriate state agency. This permit is known on the
national level as the National Pollutant Discharge Elimination System