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The value (330 mg/I) noted by the Division refers to a specific part of the mass balance <br />analysis performed during the initial PHC study. That analysis is concerned with the <br />long-term TDS concentrations in Trout Creek as stated on page 2.5-103. The analysis <br />predicts an average TDS value of 196 mg/I with the 330 mg/1 potentially occurring if the .~ <br />mine had a normal nrecinitati_ on year and the axatershed_above the mine had only half of <br />the normal_pcecipi[ation. As stated on page 2.5-105, approximately 300-400 years would <br />be required to reduce the leachate TDS to these conditions. <br />3. On page 3/ ol7he /999.9 HR. P&A1 indicates that the elevated levels of TDS in Well TR- <br />/..i may he fi-an nn old abnrrdorred underground mine up the Li!!le Trout G~eek drainage <br />or possiblv.from ilre irnnrdation of [he wren in /ate spring of 199.1 and the /gying of <br />lelephorre cahle upsh~ecrrn of dre area during the summer of 199.1. To aid in identifying <br />the source of the elevated TDS rahres, the Division is requesting additional infirrmution <br />r-egnrding [he on-site ullm•iul monitoring u~e/!s. Please provide surrey ir~fornrntion <br />(inchrding gro:md surface elevation and u rp of x•el1 ecrsirrg/measuring point elevation) <br />unrl depth !o u~n[er mensuremerrts.for 1995 through /999 for {{%lls TR-/..i, and {VR-1. <br />Al.co, the DMG cannot locale the well log ja• We1l TR-3. Please provide [!us monitor <br />well log, r'/ available. <br />The completion log gf+vell TR-l.~ indiccrres that this well eras only drilled to 6.0 below <br />ground surface acrd mater level was initially 3. D, feet belo+v ground surface. {Nell TR-L.i <br />is located below the reclaimed FVes7 Ridge Area and does not appear to be entriely <br />upgradient ofllTe disnu$ance urea. Frn•ther review ofthese data nmy determine [he <br />source of the elevated levels of TDS ut well TR-l..i. P/ease provide any infornu~tion lhcrt <br />P8M Wray have concerning the locatiar cmd oper•arion of the referenced old abandoned <br />zmdergrowtd mine up the Little Trout Creek drainage. <br />Survey information for Wells TR-1.5 and WR-1 are as follows: <br />TR-1.5: Ground Elevation = 7173.3 ft. (amsl) <br />Casing Height = 2.35 ft. <br />WR-1: Ground Elevation = 7168.0 ft. (amsl) <br />Casing Height = 2.38 ft. <br />Water measurement information for 1995 through 1999 is attached. <br />Well log for TR-3 is attached. <br />Well TR-1.5 may not appear to be upgradient of all mining disturbance when viewed in <br />plan view. However, when the strike and dip of the various fornrations in the West Ridge <br />area are taken into consideration as shown on Exhibit 2.1-1, the upgradient position of <br />Well Tr-1.5 becomes readily apparent. <br />The abandoned underground mine referred to in the AHR, in fact, is a reference to 3 <br />separate underground mines which may be influencing Well TR-1.5. The Big Mack <br />Mine closed in 1944, the Blue Spruce Mine closed in 1941, and the Moffat Coal Co. <br />Mine closed in 1941. These mines are shown on Exhibit 3.1-1. As noted in the Section <br />3.3.1, these mines extracted coal from the Pimracle Coal seam. <br />