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~~_ _ <br />~II I~~II~II~II~~ I~~ <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmenl of Nal ural Resource <br />1 :tl 3 Sherman 51., Room 215 <br />Denver, ColoraAo 8020] <br />Phone: (3071 866-3567 <br />FAX: (303) 83?-8106 <br />MEMORANDUM <br />TO: Susan McCannon, David Berry <br />FROM: Mike Boulay !~/1~ <br />DATE: February 19, 1998 <br />~~ <br />DEPARTMEfVT OF <br />NATURAL <br />RESOURCES <br />Roy Rumer <br />Governor <br />lames 5. LochheaJ <br />Exec W ive Director <br />Michael B. Lung <br />Divi.ion Dueclnr <br />SUBJECT: Holding Times for Samples Collected by Mr. Ron Hanna for MCC at Edwards Mine <br />portal Dischazge <br />As requested, [ have investigated the sample holding times for water samples collected at the <br />Edwards (vline portal discharge by Ron Hanna (contractorto MCC). The holding times range from <br />48 hours for Orthophosphate to 6 months for most total, total recoverable, and dissolved metals. 1 <br />have a list of the holding times if you are interested for your files. <br />There were at least two exceedances of the maximum allowable holding times. These are <br />summarized below: <br />Orthophosphate -holding time - 48 hours, date sampled 12/04/97, date analyzed 12/09/97; <br />Mercury -holding time - 28 days, date sampled 12/04/97, date analyzed 01/02/98. <br />There appears to be one additional exceedance but this is likely a typographical error by the <br />laboratory. <br />Molybdenum -holding time - 6 months, date sampled 12/04/97, date analyzed 12/29/98. <br />The laboratory used for [he analyses was Commercial Testing Xc Engineering Co. The laboratory <br />sheets are attached for your reference. The constituents in question are highlighted. <br />Please let me know if you require additional information. <br />