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<br /> <br />COLORADO DEPARTMENT OF HEALTH <br />Water Qudiry Conrro! Division <br />WQCD-PE-B2 <br />Cherry Crest Drive South <br />Denver, Cabrado 80222-1530 <br />RATIONALE <br />STORMWAIER DISCHARGES ASSOCUTED WITH <br />METAL MlMNG OPERATIONS <br />GENERAL PERM17' JN COLORADO <br />COLORADO DISCHARGE PERMIT NUMBER COR-040000 <br /> CONTENTS PAGE <br />/. INTRODUCTION 1 <br />^. BACKGROUND I <br />III. STORMWATER DISCILIRGES ASSOCIATED WI1H <br /> MINING OPERA77ONS 3 <br />/V. COVERAGE UNDER IIdIS PERMIT S <br />V. CRITERIA FOR REQUIRING AN INDIVIDUAL PERMIT S <br />VI. APPLICA77ON AND CERTTFJCA77ON 5 <br />VI/. STORMWATER MANAGEMENT PLAN 6 <br />VIII. TERMS AND CONDI77ONS OF PERMIT 8 <br />11L PUBLIC NO17CE CHANCES 11 <br />I. /NTRODUCTION <br />The pmnir U for the regulation of srormwater runoff associated with mend mining operations. The term 'meld' is used <br />to distinguish rids pnmit from the general permit jot coal mining with surface ducharge only, and the generd <br />srormwarer permit jot Bard and gravel mining and processing (and other nonmaaLie minerals). The tam 'mining <br />operations' includes the work or other activiry related to the turaction, ranoval or recovery of metd ore. It incbrda <br />active and inactive operatlons. 'Stormwatcr' is preripitarbn-induced surface runoff. 'Stornrwater associated with <br />.. mining operartonr,' regulated by this permit, is surfaot runoff whirfi has mme Into contact with any overburden, raw <br />mattrid, lntemiediatt products, byproducts, finished prodaas or waste products boated err the mining operation. This <br />Rationale will espbin the background of the rrormwater program, activities wJtich arc mvered under this permit, how to <br />. apply jot oo.rrage order rhls permit, and the reyuiremenrs ojrhis permit. <br />II. BACKGROUND <br />A: required order the Ckan Werra Act amadmenu of 1987, the Environmentd Protection Agrncy (EPA) has <br />established a framework jot regulating muniripd and industrid stormwater ditdtarga. This framework it order the <br />Narbnal PoBurant Dirdrarge Elimination Syston (NPDESJ program. On Novonber l6, I990, the EPA publirhr7d final <br />regulations shat establish application rcquiremenlt for ttormwater permits. Iht regulations (40 CFR 122.26) nquin <br />rperific types ojirdusrrid facilirier which discharge srormwarcr associated with industrial activiry frdusnid <br />srormwarer), ro obtain an NPDES permit. the regulations specifically include mining operations when stormwater has <br />mme into mmact with any ovnburden, raw materiel, imtrmediate products, byproducts, fitished products or waac <br />products, as industrd facilities which must obtain stormwater discharge permits. <br />Ocher regularionr, specifically 40 CFR subchapter N (mining operations an covered in sections 434, 436 a~ 440), were <br />dtvebped to rnmrol the quality ojdischarges from mills and mine drainage. Mine drainage is warn drdnnd, pumped, <br />