25 Pa. Code § 92a.47 - Sewage permit
(a) Sewage,
except that discharged from a CSO that is in compliance with subsection (b), or
as provided for in subsections (f)-(i), shall be given a minimum of secondary
treatment. Secondary treatment for sewage is that treatment that includes
significant biological treatment and accomplishes the following:
(1) Monthly average discharge limitation for
BOD5 and TSS may not exceed 30 milligrams per liter. If
CBOD5 is specified instead of
BOD5 the limitation may not exceed 25 milligrams per
liter.
(2) Weekly average discharge
limitation for BOD5 and TSS may not exceed 45 milligrams
per liter for POTW facilities. If CBOD5 is specified
instead of BOD5 the limitation may not exceed 40
milligrams per liter.
(3) On a
concentration basis, the monthly average percent removal of
BOD5 or CBOD5, and TSS, must be
at least 85% for POTW facilities.
(4) From May through September, a monthly
average discharge limitation for fecal coliform of 200/100 mL as a geometric
mean and an instantaneous maximum effluent limitation not greater than
1,000/100 mL.
(5) From October
through April, a monthly average discharge limitation for fecal coliform of
2,000/100 mL as a geometric mean and an instantaneous maximum effluent
limitation not greater than 10,000/100 mL.
(6) Provision for the disposal or beneficial
use of sludge in accordance with applicable Department regulations.
(7) Compliance with §
95.2(1) and (2)
(relating to effluent standards for industrial waste).
(8) Compliance with §
92a.48(b)
(relating to industrial waste permit) if chlorine is used.
(b) Dischargers of sewage from a CSO shall
implement, as approved by the Department, nine minimum controls (NMCs) and a
long-term control plan (LTCP) to minimize or eliminate the CSO discharge impact
on the water quality of the receiving surface water.
(c) Discharges from an SSO are
prohibited.
(d) When pollutants
contributed by indirect dischargers result in interference or pass through, and
a violation is likely to recur, a permittee shall develop and implement
specific local limits for indirect dischargers and other users, as appropriate,
that together with appropriate sewerage facility or operational changes, are
necessary to ensure renewed or continued compliance with the plant's NPDES
permit or sludge use or disposal practices.
(e) POTWs that serve indirect dischargers
shall give notice to the Department in accordance with
40 CFR
122.42(b) (relating to
additional conditions applicable to specific categories of NPDES permits
(applicable to State NPDES programs, see § 123.25)).
(f) POTWs with effluent limits that are less
stringent than those specified in subsection (a)(1) and (2) in effect on
October 9, 2010, shall meet the requirements of subsection (a)(1) and (2) when
a new or amended water quality management permit authorizing an increase in the
design flow of the facility is issued under the provisions of Chapter 91
(relating to general provisions).
(g) POTWs subject to this section may not be
capable of meeting the percentage removal requirements established under
subsection (a)(3) during wet weather, where the treatment works receive flows
from combined sewers (that is, sewers which are designed to transport both
storm water and sanitary sewage). For those treatment works, the decision must
be made on a case-by-case basis as to whether any attainable percentage removal
level can be defined, and if so, what the level should be.
(h) POTWs subject to this section may not be
capable of meeting the percentage removal requirements established under
subsection (a)(3) during dry weather, where the treatment works receive flows
from combined sewers. The Department may substitute less stringent removal
requirements than that specified in subsection (a)(3) for any POTW with less
concentrated influent wastewater for combined sewers during dry weather. The
Department may substitute either a lower percent removal requirement or a mass
loading limit for the percent removal requirements specified in subsection
(a)(3) provided that the permittee satisfactorily demonstrates all of the
following:
(1) The treatment works is
consistently meeting, or will consistently meet, its permit effluent
concentration limits, but the percent removal requirements cannot be met due to
less concentrated influent wastewater.
(2) To meet the percent removal requirements,
the treatment works would have to achieve significantly more stringent effluent
concentrations than would otherwise be required by the concentration-based
standards.
(3) The less
concentrated influent wastewater does not result from either excessive
infiltration or clear water indirect dischargers during dry weather periods.
The determination of whether the less concentrated wastewater results from
excessive infiltration is discussed in
40 CFR
35.2005(b)(28) (relating to
definitions), plus the additional criterion that either 40 gallons per capita
per day or 1,500 gallons per inch diameter per mile of sewer may be used as the
threshold value for that portion of the dry weather base flow attributed to
infiltration. If the less concentrated influent wastewater is the result of
clear water indirect dischargers, the treatment works must control these
discharges pursuant to 40 CFR Part 403 (relating to general pretreatment
regulations for existing and new sources of pollution).
(i) The Department may substitute less
stringent removal requirements than that specified in subsection (a)(3) for any
POTW with less concentrated influent wastewater for separate sewers, provided
that the permittee satisfactorily demonstrates all of the following:
(1) The treatment works is consistently
meeting, or will consistently meet, its permit effluent concentration limits
but its percent removal requirements cannot be met due to less concentrated
influent wastewater.
(2) To meet
the percent removal requirements, the treatment works would have to achieve
significantly more stringent limitations than would otherwise be required by
the concentration-based standards.
(3) The less concentrated influent wastewater
is not the result of excessive inflow/infiltration. The determination of
whether the less concentrated wastewater is the result of excessive
inflow/infiltration will be based on the definition of excessive
inflow/infiltration in 40
CFR 35.2005(b)(16), plus the
additional criterion that inflow is nonexcessive if the total flow to the POTW
(that is, wastewater plus inflow plus infiltration) is less than 275 gallons
per capita per day.
Notes
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