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TR -113 Adequacy Review Response Cont. <br />Page 2 of 2 <br />range for dissolved iron at the Trapper Mine. The 1.33 mg/1 may also be within the <br />natural range for this constituent." <br />There is no other indication of any outside factors that may have affected the iron level at <br />this well. Well P -1 is in a shallow aquifer and may be easily manipulated by dry periods <br />and lower water levels. <br />3.) Well P -3 has been reported to be dry since the last measurements were taken in June of <br />2005. Prior to this, the water elevation's almost mirrored the elevations measured at well P -1 <br />until the well was reported to be dry. This is logical given the construction of this well and its <br />proximity to P -1. It is unclear why this well went dry so suddenly. There may be a problem with <br />this well, perhaps a blockage of some kind. Please evaluate the condition or provide an <br />explanation for why the well went dry. <br />Upon further inspection by myself and Jared Ebert of the division it appears there is a <br />problem at this well. The casing has either cracked, sheared or collapsed at <br />approximately 17 feet of a total of 34.9 feet. <br />George Hoffinan states, "The Lewis Shale well P -3 has produced very similar results to <br />the P -1 alluvial Pyeatt well. The Lewis Shale is not a reasonable aquifer due to its low <br />permeability and poor water quality. Monitoring of the Lewis Shale at the Trapper Mine <br />should not be necessary and not very likely to produce beneficial data." <br />Trapper will evaluate the abandonment and or repair of this well at this time. If the <br />division is supportive of abandonment of this monitoring point, it will be included as <br />such in a future permitting action. Trapper concurs with Mr. Hoffinan that the well is <br />probably not of any benefit in the future. <br />Please contact me if you have any additional questions or comments. <br />Sincerely, <br />,,,a /�- 4 <br />Graham Roberts <br />Environmental Engineer <br />GCR <br />WANNUALRPTORMSURPTIAnnual Hydrology Report Responsel Letter.DOC <br />Enclosure <br />File 109.2.3.4, w/o enc <br />Shelf Binder w /enc <br />