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<br />' ARCADISGERAGHTY&MILLER <br />1 <br />Technical Support <br />Document for the <br />CDPS Permit <br />Application <br />' 29) Priority Pollutant scan: Data not available since the unit is not yet operational. We will analyze the <br />efFluent waste stream for the pollutants in Appendix A of the petmit application when a waste stream is <br />' available. <br />30) Additional Monitoring: Relevant data are included in Appendix A and Appendix B attached to this <br />' application. <br />31) Submit a copy of all water quality monitoring data of outfalls or receiving streams gathered over <br />1 the past 5 years and which is required by DMG. <br />The data are included in Appendix B to this application, in electronic forma[. The program which can <br />' open the file is Microsoft Access or Excel. <br />32)Bulkstorage: Not applicable <br />' 33) Activity duration: Mining began at the site in Spring 1990 and ceased in October 1996. <br />' The estimated life of the activity from which the discharges to be permitted originate is described in <br />section 3.2.4 of TR-26. <br />' 34) Stormwater discharge: A Stormwater discharge permit is currently in place for the site. The Mine is <br />covered under CDPS General Permit No. COR-0400000 for Stormwater related discharge. <br />35) Pollution Prevention Plans: The following Best Management Practices (BMPs) have been employed <br />' at the mine site to prevent surface water and shallow groundwater from impacting the Rito Seco. <br />A french drain has been installed upgradient of the seep locations to intercept the seeps. The water <br />' captured by the French drain has been pumped back to the West Pit. <br />Isolation structures have been installed below the seeps to isolate the seep water from the surface water <br />' in the Rito Seco. The structures are built from steel curtains driven into the streambed. These curtains <br />are lined with HDPE inserts on the upstream side. <br />' A pumpback system has been installed to reverse the gradient away from the Rito Seco. <br />Run-on control measures have been installed across the reclaimed site to prevent Stormwater run-on <br />' from entering the Rito Seco. <br />An enhanced evaporation system has been installed to remove water from the West Pit. The <br />evaporation system is currently removing approximately 60 gpm. <br />' Diversion structures have been placed within the pits. <br />1 <br />9/ 10 <br /> <br />