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APPL, INC. <br /> Wet Chemistry Lab <br /> QC Summary <br /> Client: Camp, Dresser McKee, Inc. <br /> ARF: 27886 <br /> Method 353.2 <br /> Analyte: NO2-N <br /> Blank Recovery <br /> Blank Conc.(mg/L) <br /> NO2-N <0.1 980616A-353,2 <br /> Matrix Duplicate and Spike <br /> aam-11212 SA(mall.) SRg/L) SSR[me/L) J%R RPD QQG <br /> 65679W 0 ND X X <DL 980616A-353.2 <br /> 65679WD 0 ND X X 980616A-353.2 <br /> 65679WMS 4 0.00 3.9 97.5 0.0 980616A-353.2 <br /> 65679WMSD 4 0.00 3.9 97.5 980618A-353.2 <br /> Laboratory Control Sample <br /> A_nAjM 5ALm-2LU MilngAd M B EQ_ <br /> NO2-N 4 4.1 102.5 0.0 980616A-353.2 <br /> N0 2-N 4 4.1 102.5 X 98 16A-353.2 <br /> Initial Calibration Verification <br /> Analyte SAa/L1 .031mgm %R <br /> NO2-N 3 3.1 103.3 980616A-353.2 <br /> Continuing Calibration Verification <br /> Analyte SA(mol) 55BLM-2&1 %R <br /> NO2-N 1 1.0 100.0 980616A-353.2 <br /> NO2-N 1 1.0 100.0 980616A-353.2 <br /> Acceptable limit for the method blank Is<than the MRL (0.1 mg/L). <br /> Acceptable limit for a matrix duplicate Is RPD<20. <br /> Acceptable limit for matrix spike Is+1-25%spike recovery. <br /> Acceptable limit for Laboratory Control Sample Is+/-20%spike recovery <br /> SA=spike amount SR--sample recovery SSR=sample spike recovery <br /> %R--%recovery RPD=relative%difference QCG=quality control group <br /> CS 011081 <br /> Page 2 City of Stockton 190855-0006 <br />