25 Pa. Code § 250.309 - MSCs for surface water
(a)
Any regulated discharge to surface waters shall comply with the applicable
provisions of Chapters 91-96, 97 (reserved), 102, 103 and 105, including
antidegradation requirements, and may not cause an exceedance of the applicable
water quality standards for the surface water in question.
(b) For point source discharges to surface
water, compliance shall be measured at the point of discharge in accordance
with limits specified in the NPDES permit.
(c) For purposes of determining compliance
with surface water quality standards from a diffuse surface or groundwater
discharge, the person shall determine the expected instream regulated substance
concentrations, that are attributable to releases at the site, using mass
balance techniques for groundwater/surface water mixing at design flow
conditions.
(1) If the results indicate that
surface water quality standards are being achieved, no action is
required.
(2) If results indicate
that surface water quality standards are not being achieved, additional
sampling may be performed to help evaluate whether surface water quality
standards are being achieved.
(3)
If the results of the sampling indicate surface water quality standards are
being met, no further action is required.
(4) If the results of the modeling, and
sampling if any, indicate that surface water quality standards are not being
met, the person shall perform further remedial action to attain the surface
water quality standards.
(d) Except if an NPDES permit is required,
for purposes of complying with surface water quality standards in a spring, the
point of compliance is the point of first designated or existing use, as
defined in §§
93.1,
93.4 and
93.9 (relating to definitions;
Statewide water uses; and designated water uses and water quality criteria). If
the point of first designated or existing use occurs in a surface water into
which a spring flows, compliance with surface water quality standards shall be
determined in the manner specified in subsection (c).
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