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COLORAJ~IJEPARTMEM OF PLIBLlC HEALTH AND ENVIRONMENT; Water Quotiry Conrrot Division Rareonale -Page 1. Permit No. COGSOa7a0 RATIONALE SAND AND GRAVEL PRODUCTION OPERATIONS (AND OTHER NONMETALLIC MINERALS EXCEPT FUEL) GENERAL PERMIT IN COLORADO COLORADO DISCHARGE PERMIT NUMBER COG-500000 FOURTH RENEWAL CONTENTS PAGE IL STORMWAT£R PROGRAM III. COVERAGE UNDER ITIIS PERMIT IY CERTIFICATION V. TERMS AND CONDITIONS OF PERMIT YI. REPORTING REQUIREMENTS vll. PUBLIC NOI7CE CHANGES UPDATE This is for the renewal ojthegeneral sand and gravel permitfirst issued on October 28, 1481, with reissuances on June 10, 1987, August 31, 1991, and.4ugust 31, 1997. The Genera/ Permit system jot regulating sand and gravel production operations has worked wel/for the Stare of Colorado. The following minor changes have been made to the permit and Rationale during renewal: A. Small MunicipalityF,xemption: The RationalediscussiononthestormwaterpermittingF.xemptionsforSmallMunicipatitie.~ (Section III.B) has been changed ro include the March 10, 1003 deadline for permit coverage jot municipally owner' industries. This did not involve any changes to the permit. B. Reapplication: Authorization to discharge under this general permit will expire on September 30, 2007. For cerrificatiwa covering stormwater discharges only (i. e., the permittee's individual certification does not indicate that Parr LB of tl: - permirmust be followed), the deadline for reapplication for continued coverage under the generalpermit has been changr~ to ninety-days prior to permit expiration, or June 30, 2007. The due date for permittees certified to discharge srormwal.; and process water will remain as 180 days before permit expiration, or March 3I, 1007. C A paragraph was included in the introductorypage explaining the right ofanyparty to an adjudicatory hearing contesti the renewal ofthis general permit, as per the Colorado Discharge Permit System Rezularions, Regulation No. 6I, (3 C( 1002-61). Note that this doer not provide for an adjudicatory hearing for a certification issued under this general pen.; D. Impacted Stream Segmenu: For this general permit, any existing or new operation that discharges to a segment that is !i on the Division's 303(d) list of impacted stream segmenu may require an individual permit The 303(d) segmenu segmenu in which water quality standards for one or more pollutanu are exceeded. For most, ifnot all, of the operations that discharge under thispermit, there are no monitoring data to verify the expecu.~ that these discharges will not impact a listed segment. Therefore, for those facilities that discharge process wat~• segmenu on the 303(d) list, the permitrees will be required to perform a one-time analysis upon commencement ofdiscl,•= for the listed parameters ofconcern ro confirm that stream standards for these parameters are nor exceeded in the discF,a cancenrrarions. Where the receiving water is included on the state's 303(d) list, total maximum daily loads (TMDLs) are being develol~« accordance with the Division's schedule for TMDL completion. Once a TMDL has been established, if it is necessar incorporate limttarions for a facility certified under thisgeneral permit which are based upon the outcomes of the TM" the resvlu ofthe one-time analysis, an individualpermitmay be written to regulate duchmges from this facility. Thej would continue to be covered under this general permit cert~cation until the individual permit is issued. II STORMWATER PROGRAM As required under the Clean WaterAct amendmenu of1987, the Environmental Protection.fgency (EPA) has established afrm for regulating municipal and industrial stormwaterdischarges. This framework is under the National Pollutant Discharge Elin System (NPDES) program. The regulations (40 CFR 12216) require specif[c types of industrial facilities which discharge slot associated with industrial activity (i»dustria/ stormwater), to obtain coverage for this discharge under an NPDESpermit F which discharge industrial stosmwater either directly ro surface waters or indirectly, through municipal separatestorm sewers, covered by a permit.