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<br />Mr. David Beverlin <br />-2- <br />August 16, 1990 <br />3. TDS levels reach their highest average level at sample point TR-C. This <br />appears to be a result of mining activities at the Edna Mine. These <br />increases appear to be within predicted parameters. TDS dilutions are <br />less in 1989, probably due to the lower flow rates from upstream. The <br />company mentions the increased agricultural activity on the western bank <br />of Trout Creek as an additional source for increased TDS's. Readings for <br />the April 1989 TDS was 1005 and for October 1989 was 51. These readings <br />do not follow other site parameters of same period or expected readings <br />based upon TR-C historic data. The operator claims that the readings <br />were properly taken, and the instrument registered "normal" readings at <br />other sites both before and after these readings. H~ reoorts that the <br />instrument is 1'brated annuall No conclusions can be arrived at this <br />time a ou the significance o ese two readings. At the time of <br />routine readings the operator is advised to take notes of pertinent <br />conditions that might influence readings, such as rainfall, runoff, <br />stream conditions, etc. to better allow interpretation for these <br />unexpected readings. <br />Concerns with presented laboratory work are as follows: <br />Surface <br />TR-C EC pry 9 & Oct 89 <br />TR-D EC Oct 89 <br />Ground <br />WR-1 SOq 7u 1- $J <br />4. Water levels appear largely unchanged or slightly lower in 1989. TR-3 <br />and WR-1 show lower levels, while TR-1 .5 and TR-4 appear unchanged. <br />Sincerely, <br />'_~"G". <br />J. M. Clayton <br />Reclamation Specialist <br />JMC/scg <br />Enclosure(s) <br />9537E <br />