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LAFARGE <br />NORTH AMERICA <br />Construction Materials <br />Lafarge acknowledges the CDPS maximum daily dischazge rate of 1.44 MGD. Lafazge will <br />amend the existing CDPS permit prior to adding new discharge points in the amendment area or <br />dischazging at a rate greater than 1,000 GPM. <br />25. In Section 4 -Table A, there appears to be a discrepancy between the Key and the table. <br />The Division assumes that the diesel fuel tanks, etc. will be placed on impervious surfaces <br />and requests that the applicant describe the makeup of the "impervious surface. " <br />An updated version of the Stormwater Management Plan has been included, which includes <br />significant changes to the format and information included. The updated version is intended to <br />serve as a guideline and provide Best Management Practices (BMPs). The SWMP for the site <br />cannot be truly accurate until mining commences; at this point no stormwater controls aze <br />necessary. <br />26. Section 7.• Preventative Maintenance, the applicant should specify an inspection <br />frequency for all facilities listed. <br />Section 7: Preventative Maintenance has been updated to specify an inspection frequency for <br />each facility listed. <br />27. The statements describing the implementation and applicability of the practices in <br />Section 9: Best Management Practices are listed as options. Please indicate which <br />one(s) will actually be used on site and where so the Division can calculate the <br />applicable bond amount for removal and/or reclamation of such structures. <br />Specific BMPs have been selected to allow the Division the ability to calculate the bond amount; <br />the maximum number of controls has been selected to eliminate the need for future bond re- <br />calculations. Once mining begins and the need for storm water controls arises, the SWMP will <br />be revised. The number of controls implemented will not exceed what is presently indicated in <br />the SWMP. <br />End Memo - SKJ <br />Enclosures: Groundwater and Surface Water Evaluation Before During and After Riverbend <br />Mining Operations <br />Borehole Data <br />Borehole Location Map <br />SWMP <br />Exhibit F <br />Groundwater Monitoring Plan <br />LAFARGE NORTH AMERICA INC. -Lafarge Aggregates, Concrete & Asphalt <br />10170 Church Ranch Way, Suite 200 Westminster, Colorado 80021 <br />Telephone: (303) 657-0000 Facsimile: (303) 657-0037 <br />