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AraZ Laboratories, Inc. <br />2773 Downhill Drive Steamboat Springs, CO 80487 (800) 334-5493 <br />Rio Grande Silver, Inc. ACZ Project ID: L25209 <br />PARAMETER <br />METHODWORKNUM <br />QUAL <br />DESCRIPTION <br />L25209-02 WG386584 Mercury, total <br />M1631, Atomic Fluorescence <br />C5 <br />Sample received with inadequate chemical preservation. <br />Additional preservation performed by the laboratory. <br />WG386529 Silica, total recoverable <br />M200.7 ICP <br />ZS <br />Digestion procedures have the potential to trigger silica <br />polymerization and precipitation, leading to low biased <br />results. Silica chemistry is complex and polymerization <br />kinetics are unpredictable. Dissolved and/or acid soluble <br />silica analyses may provide more accurate measurements. <br />WG387348 Carbon, dissolved organic (DOC) <br />SM5310B <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< 1 Ox MDL). <br />WG386291 Chemical Oxygen Demand <br />M410.4 <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< 1 Ox MDL). <br />WG386550 Chloride <br />M300.0 - Ion Chromatography <br />RA <br />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 />WG386196 Nitrite as N, dissolved <br />M353.2 - Automated Cadmium <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />Reduction <br />validation because the sample concentration is too low for <br />accurate evaluation (< 1 Ox MDL). <br />WG386676 Nitrogen, ammonia <br />M350.1 <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< 1 Ox MDL). <br />WG386566 Nitrogen, total Kjeldahl <br />M351.2 - TKN by Block Digester <br />M1 <br />Matrix spike recovery was high, the recovery of the <br />associated control sample (LCS or LFB) was acceptable. <br />M351.2 - TKN by Block Digester <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< 1 Ox MDL). <br />WG386628 Phosphorus, total <br />M365.1 - Auto Ascorbic Acid <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />(digest) <br />validation because the sample concentration is too low for <br />accurate evaluation (< 1 Ox MDL). <br />WG386197 Residue, Filterable (TOS) @180C <br />SM2540C <br />N1 <br />See Case Narrative. <br />SM2540C <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< 1 Ox MDL). <br />WG386260 Residue, Non -Filterable (TSS) @105C <br />SM2540D <br />N1 <br />See Case Narrative. <br />SM2540D <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< IOx MDL). <br />WG386326 Sulfide as S <br />SM450OS2-D <br />M1 <br />Matrix spike recovery was high, the recovery of the <br />associated control sample (LCS or LFB) was acceptable. <br />SM450OS2-D <br />RA <br />Relative Percent Difference (RPD) was not used for data <br />validation because the sample concentration is too low for <br />accurate evaluation (< 1 Ox MDL). <br />REPAD.15.06.05.01 <br />L25209-1507241357 Page 34 of 45 <br />