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Technical Support <br />' Document for the <br />ARCADISGERAGHTY&MIILER CDPS Permit <br />Application <br />' The document titled "TR-26, Water Management in the West Pit Area, San Luis Project, Costilla County, <br />Colorado" provides detailed information regarding BMRI's response to these conditions as required under <br />the current DMG permit. The response plan includes short-term and long-term water management plans. <br />' The short-term water management plan includes the operation of a French drain pumping system and <br />physical surface isolation of any measurable surface seeps with steel and HDPE curtains anchored into the <br />' ground at the seeps. The plan also contemplates pumping of wells in the backfilled pit to produce a final <br />water level that will reverse the groundwater gradient away from the Rito Seco such that the seepage into <br />the Rito Seco alluvium from the West Pit area will be eliminated. The water pumped will be handled <br />t through an evaporation system and/or through treatment by an industrial wastewater plant. <br />This permit application is intended to permit the direct discharge from the proposed wastewater treatment <br />' plant as well as the seepage front associated with the backfilled West Pit. The permit application <br />contemplates best management practices intended to respond to the seepage front as described in more <br />detail in Section 6.0 of TR-26. <br />' The mine is not currently operating, so no mining or milling processes are contributing to, or could <br />contribute to the wastestreams being permitted. <br />' 7) Type of Mining Activity: There are no current mining operations or activities ongoing at the site. <br />Reclamation activities have been underway since cessation of mining activities in 1996. However, the <br />DMG reclamation bond has not been released. <br />Under the Federal definition, as described in 40 CFR 440.132 "an Active mining area" is a place where <br />work or other activity related to the extraction, removal, or recovery of metal ore is being conducted, <br />' except, with respect to surface mines, any area of land on or in which grading has been completed to <br />return the earth to desired contour and reclamation work has begun. Reclamation work has been <br />initiated at the San Luis Mine, and according to this definition, it is not considered to be an Active <br />' mining area. <br />8) Production: Not applicable. See response to item 6. <br />' 9) Lv operation seasonal? No <br />' 10) Intermittent discharges. No. <br />11) Location Map: See Figure I attached. <br />' 12) Site Map: See Figure 2 attached. <br />1 <br /> <br />3/10 <br /> <br />