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ADZ Laboratories, Inc. <br />2773 Downhill Drive Steamboat Springs, CO 80487 (800) 334-5493 <br />Twentymile Coal Co. October 26, 2015 <br />Project ID: 451748015 <br />ACZ Project ID: L27265 <br />ACZ Laboratories, Inc. (ACZ) received 2 oil samples from Twentymile Coal Co. on October 15, 2015. The samples were <br />received in good condition. Upon receipt, the sample custodian removed the samples from the cooler, inspected the <br />contents, and logged the samples into ACZ's computerized Laboratory Information Management System (LIMS). The <br />samples were assigned ACZ LIMS project number L27265. The custodian verified the sample information entered into the <br />computer against the chain of custody (COC) forms and sample bottle labels. <br />All analyses were performed within EPA recommended holding times. <br />These samples were analyzed for organic parameters. The individual methods are referenced on both, the ACZ invoice <br />and the analytical reports. The extended qualifier reports may contain footnotes qualifying specific elements due to QC <br />failures. In addition the following has been noted with this specific project: <br />1. (S13) Surrogate recovery was below laboratory and method acceptance criteria. Sample was reanalyzed on a dilution <br />confirming initial recovery. Matrix interference suspected, but insufficient sample received to confirm by reextraction. <br />Lf#/'P�' M� 648 Page 2 of 23 <br />