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STATE OF CO~.ORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dapanment w Na0.nal Re wurees <br />1317 Sherman St., Roam 215 <br />Denver, Colorado flIL'O7 DIVISION O F <br />Rhone: l3ml fl64-7547 MINERAL S <br />FAK: IJO7)fl32-8104 & <br /> GEOLOGY <br /> RECLAMATION <br /> ' MINING•SA FETY <br />Date: September 10, 1999 <br /> Bill Owens <br /> <br />To: <br />Jim Dillie Grnemor <br /> _ ~l <br />1 ~ Grcg E Walchcr <br /> <br />r ~ Execw;ve Dveclur <br />From: Harry Poseyv M;chael R. Eong <br /> Drviy~nn Direclnr <br />Subject: Review of TR-26 Response, BMRI, San Luis Project; M-88-112 <br />TR-26 Response <br />General Comment 1. It is recognized that the only surface water quality exceedances <br />are for sulfate and manganese. It is understood that these exceedances pose aesthetic <br />risks only, not human health risks. It appears that most of TR-26 and the TR-26 <br />responses aim at reducing concentrations of sulfate and manganese in ground and/or <br />surface water. The operator should recognize that concentrations of several elements <br />in some backfill wells exceed either surface water standards, groundwater numeric <br />protection levels, drinking water or agriculture standards. Concentrations of Mn and <br />SOa routinely exceed drinking water standards, but so also does F. The following <br />parameters do not meet either surface water, drinking water or agriculture standards for <br />at least one sampling of one well: AI, Ag, As, Ba, B, CI, Cr, Fe, NH4, Hg, Ni, NOZ-N03, <br />Pb, pH, and Zn. The proposed treatment systems must address these elements as well <br />as Mn and SO4. <br />COMMENTS ON NANOFILTRATION/REVERSE OSMOSIS SYSTEM <br />Information received in BMRI's letter of August 27 indicate that chemicals including <br />NaOH, CaO, and HCI will accompany the RO/Nanofiltration process. If volumes of <br />these chemicals stored on site are to be significant, it may be necessary to bond for <br />their maintenance or removal. What maximum quantities of these chemicals will be <br />stored on site? Where/how will they be stored? Will other chemicals be necessary? If <br />so, which chemical and what maximum quantities may be stored on site? <br />