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CONSTITUENTS i <br />QC NAME <br />CONTROL LIMITS <br />TRUE VALUE <br />FOUND VALUE <br />% RECOVERY <br />Conductivity <br />178698 <br />1000 uS/cm <br />500 <br />501.0 <br />100.2 <br />Al <br />178698 <br />90 -110 % <br />1200.0 <br />1186 <br />98.8 <br />As <br />178698 <br />90 -110 % <br />50.0 <br />49.6 <br />99.2 <br />Cd <br />178698 <br />90 -110 % <br />5.0 <br />4.77 <br />95.4 <br />Cu <br />178698 <br />90 -110 % <br />100 <br />91.6 <br />91.6 <br />Fe <br />178698 <br />90 -110 % <br />2000 <br />2036 <br />101.8 <br />Hg <br />178698 <br />- 80 -120 % <br />0.5 <br />0.482 <br />96.4 <br />Mn <br />178698 <br />90 -110 % <br />250 <br />231 <br />92.4 <br />Zn <br />178698 <br />90 -110 % <br />175.0 <br />160.0 <br />91.4 <br />CONSTITUENTS <br />QC LOT# <br />CONTROL LIMITS <br />TRUE VALUE <br />FOUND VALUE <br />% RECOVERY <br />Conductivity <br />178698 <br />1000 uS/cm <br />500 <br />501.0 <br />100.2 <br />pH <br />STOCK <br />90 -110 % <br />7.0 <br />7 <br />100.0 <br />Sulfate <br />178698 <br />90 -110 % <br />250 <br />231 <br />92.4 <br />Total Dissolved Solids <br />178698 <br />90 - 110 % <br />900 <br />912 <br />101.3 <br />SINCE 1994 <br />Sangre De Cristo (SDC) Laboratory, Inc. <br />QUALITY CONTROL WORKSHEET <br />CLIENT NAME: RIO GRANDE SILVER <br />CLIENT COC #'S: 32803 -14 <br />Tierra Del Sol Industrial Park, 2329 Lava Lane, Alamosa, CO 81101 <br />Ph.: (719) 589 -1024 • Email: edv(Wsangrelabs.com • Fax.: (719) 589 -3697 <br />HEAVY METALS; <br />** = Stock OC Solution was diluted to be within the range of standards. <br />CATIONS / ANIONS: <br />VERIFIED BY : <br />DATE: 44/t, <br />