25 Pa. Code § 88.511 - Baseline determination and compliance monitoring for pre-existing discharges at remining operations
(a) The
procedures in this section shall be used for determining site-specific baseline
pollutant loadings, and for determining whether discharge loadings during coal
remining operations have exceeded the baseline loading. A monthly
(single-observation) procedure and an annual procedure shall be
applied.
(b) At least one sample
result per month shall be obtained for 12 months to characterize pollutant
loadings for:
(1) Baseline
determination.
(2) Each annual
monitoring period. It is required that at least one sample be obtained per
month for 12 months.
(c)
Calculations described in this subchapter shall be applied to pollutant
loadings.
(d) Each loading value
shall be calculated as the product of a flow measurement and pollutant
concentration taken on the same date at the same discharge sampling point using
standard units of flow and concentration.
(e) If the baseline concentration in a
baseline sample is below the daily maximum effluent limits established in
§
88.92, §
88.187 or §
88.292 (relating to hydrologic
balance: effluent standards), the baseline sample concentration may be replaced
with daily maximum effluent limit for the purposes of some of the statistical
calculations in this subchapter.
(f) The substituted values should be used for
all methods in this subchapter except for:
(1)
The calculation of the interquartile range (R) in Method 1 for the annual
trigger (Step 3).
(2) Method 2 for
the single observation trigger (Step 3).
(g) The interquartile range (R) is calculated
as the difference between the quartiles M-1 and
M1; the values for quartiles M-1
and M1 should be calculated using actual loadings (based
on measured concentrations) when they are used to calculate the interquartile
range (R).
Notes
The provisions of this § 88.511 issued under section 5 of The Clean Streams Law (35 P.S. § 691.5); sections 4(a) and 4.2 of the Surface Mining Conservation and Reclamation Act (52 P.S. §§ 1396.4(a) and 1396.4b); and section 1920-A of The Administrative Code of 1929 (71 P.S. § 510-20).
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