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<br /> <br />MEMORANDUM <br />TO: Ms. Lori Potter E-MAIL: lpotter@khgk.com <br />FROM: Jerald S. Fifield, Ph.D. FAX: (303) 841-6386 <br />HydroDynamics Incorporated PHONE: (303) 841-0377 <br />19039 E. Plaza Drive E-MAIL: hdi@ecentral.com <br />PO Box 1327 <br />Parker, CO 80134 <br />DATE: Apri123, 1999 PROJECT NO. 9925-O1 <br />SUBJECT: Response to BMRI Report <br />As requested, we have reviewed the Battle Mountain Resources, Inc. (BMRI) report. Our <br />evaluation is limited to items associated with surface water and sediment and erosion <br />control. We assume items related to ground water conditions, chemical reactions, and <br />treatment for chemical related problems aze addressed by other individuals. <br />The following is presented for your review and consideration: <br />.Very little information is presented about the Ri[o Seco. It may be possible that <br />monitoring stations along this stream have not detected any degradation. However, <br />BMRI should demonstrate this fact in their report. <br />.It appears precipitation data (see Figure 2-1) has been omitted from 10/01/89 to <br />10/01192. Also, precipitation data should be illustrated at least monthly rather than <br />quarterly. <br />.I[ appears the sulfate and manganese data illustrated in Figure 3-6 represent random <br />"grab samples" from the Rito Seco. Since continuous sampling has not been <br />completed, it is not known how these constituents actually varied throughout each <br />yeaz. For example, do the graphs represent maximum, minimum, or average <br />concentrations? <br />.No information has been presented on whether sediment has entered, or is cudrently <br />entering, the Rito Seco at rates that exceed historic conditions. Continuous <br />monitoring of the stream should occur for Tota] Suspended Solids (TSS) to evaluate <br />this situation. <br />.Figure 3-4 and Figure A-30 illustrate ground water movement toward the Rito Seco. <br />While information has been presented on sulfate and manganese concentrations, little <br />data are available about Total Dissolved Solids (TDS). Since TDS values are not <br />illustrated, it is not known if the stream has been impacted by the mining gperation. <br />.It appeazs runoff waters from the Ri[o Seco tributary where monitoring Statiop RS-3 is <br />located may have been impacted by the mining operation. Although BMR)< attributes <br />the fluctuation of manganese to "natural sources" (see page 18), it is curious that the <br />changes appear to commence once the mining operation began. This should be <br />further evaluated. <br />.Significant fluctuations in sulfate and manganese appear to occur at the lowest <br />downstream monitoring station (RS-5) during 1997. In addition, Station RS-2 <br />illustrates increased concentrations of sulfate and manganese began in the latter part <br />