25 Pa. Code § 92a.27 - Sewage discharges
(a) The
following additional application requirements apply to new and existing sewage
dischargers (including POTWs and privately owned treatment works), as
applicable:
(1) The following sewage
dischargers shall provide the results of whole effluent toxicity testing to the
Department:
(i) Sewage dischargers with design
influent flows equal to or greater than 1.0 million gallons per day.
(ii) Sewage dischargers with approved
pretreatment programs or who are required to develop a pretreatment
program.
(2) In addition
to the sewage dischargers in paragraph (1), the Department may require other
sewage dischargers to submit the results of toxicity tests with their permit
applications, based on consideration of the following factors:
(i) The variability of the pollutants or
pollutant parameters in the sewage effluent (based on chemical-specific
information, the type of treatment facility and types of industrial
contributors).
(ii) The dilution of
the effluent in the receiving water (ratio of effluent flow to receiving stream
flow).
(iii) Existing controls on
point or nonpoint sources, including calculations of TMDLs for the waterbody
segment, and the relative contribution of the sewage discharger.
(iv) Receiving surface water characteristics,
including possible or known water quality impairment, and whether the sewage
discharges to an estuary, one of the Great Lakes or a surface water that is
classified as a High Quality Water or an Exceptional Value Water under Chapter
93 (relating to water quality standards).
(v) Other considerations including, but not
limited to, the history of toxic impact and compliance problems at the sewage
discharge facility, which the Department determines could cause or contribute
to adverse water quality impacts.
(3) For sewage dischargers required under
paragraph (1) or (2) to conduct toxicity testing, the EPA's methods or other
protocols approved by the Department, which are scientifically defensible and
sufficiently sensitive to detect aquatic toxicity and approved by the
Department, shall be used. The testing shall have been performed since the last
NPDES permit reissuance, or when requested by the Department, whichever
occurred later.
(b) CSO
dischargers shall submit the following information:
(1) The results of an evaluation determining
the frequency, extent and cause of the CSO discharge, including identifying the
points of inflow into combined systems.
(2) An evaluation of the water quality
impacts of the CSO discharge on receiving waters.
(3) A description of the nine minimum
controls (NMCs) described in the EPA publication entitled "Combined Sewer
Overflows-Guidance for Nine Minimum Controls" (EPA publication number
832-B-95-003 (September 1995) as amended or updated) used at the facility to
minimize or eliminate the CSO discharge impact on receiving water
quality.
(4) A long-term control
plan (LTCP) to minimize or eliminate the CSO discharge with an implementation
schedule.
(5) An update on the
progress made with the implementation of the LTCP and future activities with
schedules to comply with water quality standards.
Notes
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