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COLORADO DEPARTMENT OF PUB: HEALTH AND ENVIRONMENT, Water Qv / Cantro! Division <br />Rationale -Page 6, Permit No. CO-0042161 <br />B. Compliance Wuh Terms and Conditions of Previous Permit <br />• 1. Ellluenr Limitntions: The data shown in the preceding tables indicate apparent violations of the permits. In 1993, <br />the permittee began dewatering a portion of the old section of the mine. 7hry expected a higher flow rate, but did <br />not expect iron levels to exceed the permit limitation. When exceedences were noted, the permittee conducted <br />inneased testing at various paints within the system and thry worked with Nalco to determine an effectiue <br />flacculant. The initial flocculant was not completely effectis+e, so two additions! rhemicals were authorized by the <br />Division and added to treatment. This lowered the iron kvrl to within the permit limitation. During the initial <br />period when iron levels were highest, the facility also failed acrue WET tests. In compliance with the permit they <br />performed accelerated testing which passed the criteria, thus allowing than to resume the normal testing frequency. <br />The Division issued notice of violation letters jot the iron exceedencrs and corresponded with the perntitru on theft <br />and the WET failures umil the facility returned to compliance. <br />2. Other Permit Reauiremenrs: The permittee has been in compliance with other terms and conditions of the permit. <br />V/. TERMS AND COND/TIONS OF PERM/T <br />A. Determination of Effluent Limitations <br />1. Efluent Limirarions: The following limitations will apply and are discussed in Sections VLA.2 and VLA.3. <br />Table V/-1 - Effluent Limitations jot Outjall 00/ <br />;.... <br />.:Parameter :. :..::::::::::.:.:.:: ::.::..::"'<: lirnilatibn':.:..: .:..:;..:::; :::- Rahonak `.'.;> :i:::: ;:::.::::: ::. <br />Flow, MCD Repot Design Capacity <br />• TSS, mg/1 35/70 b/ Start Efjlrtent Regulations <br />Oil and Grease, mg/P 10 c/ State Eff/uem Regulations <br />pH, s. u. 6.5-9.0 d/ Water Quality Standards <br />Ammonia, Total, mg/f as N Report Water Quality Stardards <br />7DS, mg/1 Report Salinity Regulations <br />WET, Chronic Lethality Statistical Difference c/ State Permit Regulations <br />Aluminum (Dissolved), mg/Q Report Water Quality Standards <br />/ron 1TR), mg/[ 0.5 a/ Antidtgradation <br /> <br />a/ 30day average ' <br />b/ 30day average/Dmly Manmwn <br />c/ Daily Maeimum <br />d/ Minmum-Manmun <br />Table VI-2 - Ejfluens lmmttations jot Outjall 002 <br />Parameter ::::::....:.:::.::::::::::°.::.:LLtiltatlon•: °:::.:.:: ..:;:::. ::::':::.::Ratiartali:.:;d.:`;.::;. ;:;:' ...:.;;::;.; <br />Flow, MGD 0.015 a/ Design Capacity <br />BODs, mg/l 30/45 b/ State E,~lucnt Limitations <br />ISS, mg/1 75/110 b/ State Effluent Regulations <br />Fecal Colijorm, No./100 mP tS0 0 0/1 20 0 0 c/ Stare FC Policy <br />• <br />a! 30day outrage <br />b/ 30day averagellday avenge <br />c/ 30-day gromemc mtanl7-day grometnc ratan <br />d/ Minimum-Marimam <br />