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ACZ Laboratories, Inc. <br />2773 Downhill Drive Steamboat Springs, CO 80487 (800) 334 -5493 <br />Rio Grande Silver, Inc. <br />ACZ ID WORK14411 <br />METHOD <br />QU ". - -DI SCRIPTION <br />REPAD.15.06 05.01 <br />WG340405 Sulfate (1312 DI) <br />Acid <br />M365.1 - Automated Ascorbic RA Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< 10x MDL). <br />D516 -02 - Turbidimetric HD Analysis is outside the intended scope of the method, <br />which does not provide hold time information for soil <br />extracts No hold time is observed for collection to <br />extraction. The referenced method hold time is observed <br />for extraction - to-analysis <br />D516 -02 - Turbidimetric M2 Matrix spike recovery was low, the recovery of the <br />associated control sample (LCS or LFB) was acceptable <br />D516 -02 - Turbidimetric RA Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< 10x MDL) <br />Acid <br />Inorganic Extended <br />Qualifier Report <br />ACZ Project ID: L11050 <br />which does not provide hold time information for soil <br />extracts. No hold time is observed for collection to <br />extraction The referenced method hold time is observed <br />for extraction - to-analysis. <br />Page 29 of 38 <br />