Laserfiche WebLink
; Emeco <br />A Coming Company <br />i <br />Sample Description <br />See the attached Sample Description Information. <br />The samples were received under chain -of -custody. <br />II Analysis Repuest <br />The following analytical tests were requested. <br />Lab ID Analysis Description <br />062346-1 thru 9 Copper (Dissolved) <br />Lead (Dissolved) <br />Total Dissolved Solids, Specific Conductance <br />III guality Control <br />A. Project Specific OC. No project specific QC (i.e., spikes and/or <br />duplicates) was requested. <br />C. Laboratory Control Samples - The LCS Program <br />Duplicate Control Samples.. A DCS is a well -characterized matrix <br />(blank water, sand or celite) which is spiked with certain target <br />parameters and analyzed at approximately 10% of the sample load in <br />order to establish method -specific control limits. The DCS <br />results associated with your samples are on the attached Duplicate <br />Control Sample Report. <br />Accuracy is measured by Percent Recovery as in: <br />% recovery = (measured concentration) x 100 <br />(actual concentration) <br />Precision is measured using duplicate tests by Relative Percent Difference <br />(RPD) as in: <br />RPD = (% recovery test 1 - % recovery test 2) x 100 <br />(Jp recovery test 1 + % recovery test 2)/2 <br />Control limits for accuracy (percent recovery) are based on the average, <br />historical percent recovery +/-3 standard deviation units. Control limits <br />for precision (relative percent difference) range from 0 (identical <br />duplicate DCS results) to the average, historical relative percent <br />difference + 3 standard deviation units. In cases where there is not <br />enough historical data, EPA limits or advisory limits are set, with the <br />approval of the Quality Assurance department. <br />