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Attachment 2 <br />Whetstone <br />Assocla?te Technical Memorandum <br />Tw John Hamrick, Randy Whicker (Crater Corporatism) A104C' <br />From: Susan Wyman, P.E., P.G. <br />Date: June 118, 2010 <br />Subject: Interim water treatment system for the Schwarwvalder Mine <br />An interim water trmtmcnt system is proposed to treat groundwater from Sump I at the <br />Schwart2.walder Mine. <br />Groundwater will be pumped from Sump 1 usinb a submersible purnp or jet pump capable of <br />pumping 40 gal tons per minute (gpm). The raw water will be piped approximately 25 feet to a skid- <br />mounted ion exchange (IX) water treatment system provided by Water Remediation Tecluiology <br />(WWI.). <br />The treatment system will consist of two ion-exchange columns capable of treating up to 50 gpm. <br />The ion-exchunbc colulnm are ptrckt:d with 7T92 resin, which is spccilically onginecrod for removal <br />of uranium. <br />The treated water will be piped from the treatment system, through 3-inclt HDPE. (poly) pipe to a <br />discharge point on Ralston Crcck (Figure 1). For the interim measure. the pipe will be laid at Wound <br />surf9cc, cxocpt where it crosses the existing aces road where it will be buried and bedded or <br />culvcdod. At the temporary outfall on Ralston Crock, the pipe aril1 daylight and the flow will be <br />routed onto a rip rap apron to prevent excessive scour and erosion 41 the outfall. Flow will be <br />visible, measurable, and sampPeable at the outfall. <br />The skid-mounted treatment system will be replaced by a weatherized water treauztent systern that <br />will be housed in the existing water trcaunct plant (WTP) building. Signifi cant engineering design <br />work has already been performed for the larger water treatment system, pumps, and buried piping <br />system. The interim sy,,tem is expected to be in use for four to five weeks, and will remove 9,77 Ibs <br />of uranium per day (9.35 kg/day) based on a flow rate of 40 gpm and an alluvial >ulrundwatcr <br />Goncentratitnt of 1.G €qVL. <br />Whetstmm Associates, Inc. <br />243 N. Mann St. ? Gunni&w, Colorado 812306 Phone 970-641-7471 4 Fax 070-641-7431