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<br />/ANALYTICAL ~ <br />~ LABORATORY <br />LABORATORY TESTING SERVICES <br />RECEIVED <br />JUL 3 11000 <br />SOUTHDOWN, INC. <br />STEVE MOSSBERG <br />07/17/00 LAB NO: 9613 <br />PAGE 2 OF 4 <br />PARAMETER <br />TOTAL SELENIUM <br />TOTAL THALLIUM <br />SUMMARY OF QC DATA: Uiviaion of Minerals and GeolopY <br />REAGENT LCS RESULTS LCS TV <br />BLANK N27429 H27429 <br />mg/L <0.002 <br />mg/L <0.001 <br />0.024 0.023 <br />0.0069 0.0064 <br />TV=TRUE VALUE <br />mg/L =MILLIGRAMS PER LITER OR PPM <br />~A~ 24O S Mein Street Brighton, Colorado 80601 [303) 659-23'13 <br />Mailing Address: F?O. Drawer 507, Brighton, Colorado 80601 <br />