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0 0 <br />FART I <br />Page 2d of 17 <br />Permit No, GO-0027154 <br />b. Effective during periods of precipitation less than or equal to the <br />10-year, 24-hour event for this facility. <br />Ar.y discharge or increase in the volume of a discharge caused by <br />precipitation within anv 24-hour period less than or equal to the <br />10-year, 24-hour precipitation event (or snowmelt of equivalent <br />volume) may comply with the following limitations instead of the <br />limitations of Parts I. A.S.a, <br />Effluent Parameter Discharge Limitations <br />30 day Avg. a/ Daily Ma::imum b( <br />Settleable Solids (ml/1) 1J i/ N!A 0.5 <br />Total Iron (mg/1) 1.0 2,0 <br />He~:avalent Chromium (mg/1) .025 ,OS <br />Total Copper (mg/1) .O1 ,02 <br />To[a1 Silver (mg/1) .0001 .0002 <br />Total Mercury (mg/1) .00005 .0001 <br />Total Zinc (mg/1) .OS ,10 <br />Salinity iJ/F. N/A <br />pH - (Standard Units) shall remain between 6.5 and 9.0 b/. <br />Oil and grease shall not exceed 10 mg/1 b/ in any grab sample <br />nor shall there be a visible sheen. <br />1/ - Pursuant to 40 CFR 434.63 (a) <br />a/ b/ - See Page 4d. <br />c. Effective during periods of precipitation greater than the 10-year, <br />24-hour event Eor this facility. <br />Any discharge or increase in volume of a discharge caused by <br />precipitation within any 24 hour period in excess of the 10-~~ear, 24 <br />precipitation event (or snowmelt of equivalent volume) may comply <br />with the following limitations instead of the limitations of Parts <br />I.A.S.a and b. ~/ <br />Effluent Parameter <br />Discharge Limitations <br />30-day Avg, a/ Daily Maximum b/ <br />Total Iron (mg/1) 1.0 2.0 <br />Nexavalent Chromium (mg/1) .025 .OS <br />Total Copper (mg/1) .O1 .0_' <br />Total Silver (mg11) .0001 .0002 <br />Total Mercury (mg/1) ,00005 .0001 <br />Total Zinc (mg/1) .OS .10 <br />Salinity N/A N/A <br />pH - (Standard Units) shall remain between 6.5 and 9.0 bJ. <br />Oil and grease shall not es:ceed 10 mg/1 b/ in any grab sample nor shall <br />there be a visible sheen. <br />Modified ~ ~ ~~ <br />(Added) <br />