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<br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br /> <br /> <br />ARCADIS GE RAGHTY& MILLER <br />14) Other environmental permits: <br />Mined Land Reclamation Board: M-88-I 12 <br />UIC: None <br />404 permit: There is no individual 404 permit for the site. <br />RCRA permit: None <br />CDPS Stormwater Permit CDPS General Permit No COR-0400000 <br />Technical Support <br />Document for the <br />CDPS Permit <br />Application <br />Colorado State Air Pollution Emission: 89CS333-1,2,3,4,5 and 6 . These permits were issued for the <br />operating period of the mine. <br />Other: None <br />I S) Site-specific conditions <br />a) is site located within one mile of landfill, or any mine or mill tailings from a historic site? <br />The mine is not located within one mile of a landfill. <br />There are two historic mining activities located in the vicinity of the BMRI San Luis Mine. The EI <br />Plomo mine and its workings were incorporated into development of the East Pit and are no longer <br />relevant to the site. The location of the former EI Plomo mill site exists approximately 0.25 miles east <br />of the West Pit along the Rito Seco Road on the north side of the stream. <br />Earth Sciences Incorporated operated a heap leach that was located on the south side of the Rito Seco in <br />the area just north of monitoring point RS-3. BMRI removed all of the ore and leached materials from <br />the previous heap leach pad down to, and including, the liner. These materials were processed along <br />' with the ores from the San Luis mine. The area of the former heap leach was completely reclaimed by <br />BMRI. <br /> <br /> <br /> <br /> <br /> <br /> <br />b) is there a possibility of groundwater contamination? <br />TR-26 identifies water management issues associated with impacts to the groundwater in the vicinity of <br />the "window" along the Rito Seco. Seeps identified in October, 1998 were reported to CDPI-~ and <br />DMG immediately upon discovery in accordance with the reporting requirements of the stormwater <br />permit. This permit application is intended to cover the seepage front in the alluvial groundwater which <br />results from the backfilled West Pit. <br />The conceptual hydrologic model of the pit and alluvium identify the inflows and outflows from the <br />West Pit backfill as the likely sources of the seeps. Water quality impacts from the seeps to the <br />downstream water quality monitoring stations on the Rito Seco are not readily distinguishable, except at <br />RS-2 where it is apparent that some contaminated groundwater is in contact with Rito Seco surface <br />water. The volume and flow rate are not measurable at any of the stations identified [o date. <br />5/ I 0 <br /> <br />