Laserfiche WebLink
Whetstone <br />Associates <br />Technical Memorandum <br />15) Please provide a copy of the Yang and Edwards (1984) publication that reported that the <br />upstream U concentration in Ralston Creek was 4.0 mg/L. <br />In response to this comment, the Yang and Edwards (1984) paper was provided to DRMS by e-mail <br />on April 5, 2010. The upstream water quality in Ralston Creek is reported as 0.13 pCi/L Ra-226 and <br />4 ug/L uranium. The data published in this paper was collected before the sumps and upgraded <br />water treatment plant were operational. This paper was one of the major reasons the sumps were <br />installed in the alluvium in 1990. <br />REFERENCES <br />DRMS, 2009. Schwartzwalder Mine, Jefferson County, Permit No. M-1977-300, Environmental Protection <br />Plan, Technical Revision TR-11, Adequacy Review 41. Letter from David Bird, Division of <br />Reclamation Mining and Safety, to Mr. Craig Harlin, Cotter Corporation. October 21, 2009. <br />4109C.100416 9