2014-10-17_PERMIT FILE - C1981035A (3)

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PART R Page No. 14 Permit No. COG - 500000 specific pollutant wasteload allocations (WI.AS), are expected to be met; and b) . if the evaluation shows that additional or modified BMPs are necessary, describe the type and schedule for the BMP additions/revisions. A description of the SWMP changes shall be included with the next Annual Report, or ifrequested by the Division, whichever is sooner. Stormwater discharge monitoring may also be required. The pamittee may maintain coverage under the general permit provided they comply with the applicable requirements outlined above. The Division reserves the right to require individual or alternate general permit coverage. D. DEFINITIONS OF TERMS 1. "Acute Toxicity" means there shall be no acute toxicity in the effluent from this discharge point. The acute toxicity limitation is exceeded if 1) a statistically significant difference in mortality (at the 95% confidence level) is observed for either species between the control and any dilution Iess that or equal to the identified IWC or 2) a species mortality in any dilution of effluent (including 100% effluent) exceeds 501/6. OR "Chronic lethality" occurs when a statistically significant diffaence, at the 95% confidence level, occurs in the chronic test between the mortality of the test species in «IWC»% effluent (the chronic lWC — <dWC » %) and the control. 2. Antidegradation limits apply as the average of all data collected for months in that group during a rolling 24 -month period. These limits become effective after data has been collected for all months in the group during file 24 months following permit issuance. Where antidsgradation groups are not indicated, data from all months will be utilized to determine the reported value and the limit will become effective in the 24th month in which the permit is effective. 3. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides measurements. 4. "Chronic lethality" occurs when a statistically significant difference, at the 95% confidence level, occurs in the chronic test between the mortality of the test species in 1000/9 effluent (the chronic IWC — 100%) and the control. 5. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maxinu nn (or, for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result ofany individualsample. DMR's shall include the maximum ( and /or mimmum) ofall instantaneous values within the calendar month Any instantaaous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit. 6. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002 -31, as that portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 UM (unicxon) membrane filter. Deiatminations of "dissolved" constituents are made using the filtrate. This may include some very small ( colloidal) suspended particks which passed through the membrane filter as well as the amount of substance present in true chemical solution. 7. " Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. 8. "In- situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. 9. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. 10. "New source" is generally defined as a coal mine (or major alteration to a coal mine) the construction of which commenced after May 4, 1984. See 40 CFR 434.11()) for the complete definition. 11. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002 -31, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was first treated with nitric acid to a pH of 2 or less and let stand for 8 to 96 hours prior to sample filtration using a 0.40 or 0.45 -UM (micron) membrane filter. ]dote the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical procedure used for the constituent measured. 12. "Quarterly measurement frequency" :Weans samples may be collected at any time during the calendar quarter if a continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. 13. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters where previously approved) 14. "Settleable solids analytical procedure" is contained in 40 CFR 434.64. The method detection limit for measuring settleable solids under this part shall be 0.4 mYL 15. "Seven CA day average" means. with the excemion of fecal coliform or E. coli bacteria, the arithmetic mean of all samples collected in a