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COLORADO DEPARTMENT OFPUBLIC HFef.TN AND ENVD701JMEN7: Water QuaGry fomro! Division Rationate • Page I. Permit No. COG-SaaaW RATIONALE SAND AND ('TRAVEL PRODUCTION OPERATIONS (AND OTHER NONMETALLlCMINERALSEXCEPT FUELJ GENERAL PERMIT IN COLORADO COLORADO D/SCHARGE PERMIT NUMBER COG-500000 FOURTHRENEWAL CONTENTS PAGE !. UPDATE I f!. STORMWATER PROGRAM' I ill. COVERAGE UNDER THIS PERMlT 2 !V. CERTlFfCAT/ON Z Y. TERMSAND COND/770NSOFPERHlT 7 V!. REPORTWG REQUlREMEN7S t V/L PUBLlCNOTlCECNANGES 4 L UPDATE This is for the renews! ojthegeneral sand and gravel permit fast issued on October 28, 1982, with reissuances on June 10,1987, Augur 3/, 1992, and August 31, 1997. The General Permit system jar regulating sand and gravel production operations has worked well jo. the State ojColorado. The following minor changes have been made to the permit and Rationale during renewal: A. SrnallMuntctpalitvF.xemotion: The RationalediscussionontkestormwaterpermittingExemptionsforSmallMunicipalitie (Section lILB) has been changed to include the March /0, 1003 deadline for permit coverage for municipally owner industries. This did not involve any changes to the permit. B. Reanolication: Authorization to drschatge under thisgeneral permit will espire on September 30, 2007. Forcertification: covering stormwater discharges only ~.e., the permittee's individual certification does not indicate that Part I.B of thr permit must be followedJ, the deadline for reapplication for continued coverage under the general permit has been changer to ninety-days prior to permit expiration, or June 30,1007. The due date for permittees certified to discharge storrnwate: a~ process water will remain as 180 days before permit expiration, or March 31, 2007. C. A paragraph was included in the introducmry page explaining the right ofanyparry to an adjudicatory hearing contesting the renewal of this general permit, as per the Colorado Discharge Permit Svstem Regulations. Regulation No. 61, (S CCI 1002-till. Note that thrs does not provide for an adjudicatory hearing for a certifrcation issued under this general permit D. Impacted Stream Seements: For this general permit, any existing or new operation that discharges to a segment that is lister on the Division's 303(dJ list ojimpacted stream segments may require an individual permit The 3030 segments art segments in whick water quality standards for one or more pollutants are exceeded. For most, ifnot all, of the operations that discharge under this permit, there are no monitoring data to verify the expectatior that these discharges will not impact a lrsted segment. Therefore, far those facilities that discharge process water tt segments on the 303(d) list, the permittees will be required to perform a one-time analysts upon commencement ojdischarg~ for the !sited parameters ofconcern to confirm that stream standards for these parameters are not exceeded in the discharge concenhations. Where the receiving water u included an the state's 303(d) list, total maximum daily loads (TMDLs) are being developed it accordance with the Division's schedulejor TMDL completion. Once a TMDL has been established, ijit it necessary n incorporate limitations for afacility certified under this general permil which are based upon the outcomes ofthe TMDL o the results ojthe one-time analysis. an individual permit may be written to regulate drschargesfrom thisjaciliry. Thejacilir would continue to be covered under this general permit cernfication until the individual permit is issued. Il. STORMWATER PROGRAM As required under the Clean Waterrdct amendments of1987, the Environmental Protection,4gency (EPAJ has established aframewon jorregulatingmunicipalandindustrialstormwaterducharges. TkisframeworkisundertheNationalPollutanrDischargeEJiminatim System (NPDES) program. The regulations (40 CFR 112.26) require specific types of industria[jacilities which discharge stormwate associated witk industrial activity (industrial srormwater), to obtain coverage for this discharge under an NPDES permit. Facilitie which discharge industrial stormwater either directly to rut face waters or indirectly, through municipal separate storm sewers, must b covered by a permit.