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Table D-1. Detections in field blanks,2023 First Semiannual Monitoring. <br /> Sodium TDS <br /> Blank Sample (mg/L) (mg/L) <br /> Date <br /> 1 2/1/2023 19 40 <br /> 2 3/24/2023 ND ND <br /> 3 4/4/2023 ND ND <br /> Field Duplicates <br /> Duplicates monitor matrix consistency or heterogeneity. Three field duplicates were collected <br /> during the 2023 First Semiannual Monitoring event. Most of the duplicate sample results <br /> agreed, had differences within 10 percent, or had differences within the PQL of the constituents <br /> analyzed. Table D-2 shows constituents having differences between duplicate samples greater <br /> than 10 percent and differences greater than the PQL. Differences in duplicate samples collected <br /> and analyzed during the 2023 First Semiannual monitoring event for all constituents except <br /> Total Coliform either agreed, had differences within 10 percent, or had differences within the <br /> PQL of the constituents analyzed. <br /> Table D-2. Constituents having differences between duplicate samples greater than 10 percent <br /> and differences greater than the PQL, 2023 First Semiannual Monitoring. <br /> Total Coliform <br /> Site Sample (MPN/100 <br /> Date <br /> mL) <br /> CLSP-12 2/1/2023 7.8 <br /> CLSP-12 (D) 2/1/2023 4.5 <br /> Difference 1.3(54%) <br /> MBRMW-3 4/3/2023 2 <br /> MRBRMW-3 (D) 4/3/2023 ND <br /> Difference 1(50%) <br /> Matrix Spikes and Laboratory Control Samples <br /> Matrix spikes (MS), matrix spike duplicates (MSD), laboratory control samples (LCS), blank spikes <br /> (BS) and blank spike duplicates (BSD) were analyzed by the laboratory to evaluate the accuracy <br /> and precision of the sample extraction and analysis procedures and to evaluate potential matrix <br /> interference. Matrix interference is defined as the effect of the sample matrix on the precision <br /> of the extraction and/or analysis procedure. These effects may bias the sample results either <br /> high or low. <br /> MS or MSD samples are prepared by adding a known quantity of the target analyte(s) to a <br /> sample. BS and BSD samples are prepared by adding a known quantity of the target analyte(s)to <br /> laboratory grade deionized water. The samples are then extracted and analyzed as a typical <br /> environmental sample and the results are reported as a percent recovery. <br /> Spike analysis result — original sample concentration <br /> %Recovery = x 100% <br /> Concentration of spike addition <br /> D-2 <br />