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January 11, 2019 Lab ID : STKI854539 <br /> Pacific Northwest Oil Customer : 3-16002 <br /> Quality Control -Inorganic <br /> Definition <br /> ND :Non-detect-Result was below the DQO listed for the analyte. <br /> <'/4 :High Sample Background-Spike concentration was less than one forth of the sample concentration. <br /> DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Explanation <br /> 220 :The CCB was greater than the DQO.However,all results were either five times greater than the CCB concentration or ND relative <br /> to the PQL. <br /> 430 :Post Digestion Spike(PDS)not within Acceptance Range(AR)because of matrix interferences affecting this analyte.Data was <br /> accepted based on the LCS recovery. <br /> 435 :Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Amended Page 8 of 8 <br />