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gT,(:q@H laboratories <br /> Condor Earth Technologies,Inc. Project Number: 5401 <br /> 188 Frank West Circle Project Name: 216 N.California St.Closure Work Order No.: <br /> Stockton,CA 95206 Project Manager: Bill Cook 1802060 <br /> BTEX EPA Method 8021B-Quality Control <br /> Argon Laboratories <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch I800494-EPA 5030B <br /> Blank(I800494-BLKI) Prepared&Analyzed:02/28/08 <br /> Surrogate:a,a,a-Triuorotoluene 48.0 ug/L 50.0 96 70-130 <br /> Benzene ND 0.5 " <br /> Toluene ND 0.5 " <br /> Xylenes(total) ND 1.0 " <br /> Ethylbenzene ND 0.5 " <br /> LCS(I800494-BS1) Prepared&Analyzed:02/28/08 <br /> Benzene 20.0 ug/L 25.0 80 80-120 <br /> LCS Dup(I800494-BSD1) Prepared&Analyzed:02/28/08 <br /> Benzene 22.2 ug/L 25.0 89 80-120 10 20 <br /> Matrix Spike(1800494-MSI) Source:1802051-08 Prepared&Analyzed:02/28/08 <br /> Benzene 20.3 ug/L 25.0 ND 81 70-130 <br /> Matrix Spike Dup(I800494-MSD1) Source:I802051-08 Prepared&Analyzed:02/28/08 <br /> Benzene 20.3 ug/L 25.0 ND 81 70-130 0 20 <br /> Batch 1800495-EPA 5030B <br /> Blank(1800495-BLKI) Prepared&Analyzed:02/27/08 <br /> Surrogate:a,a,a-Tri,/luorotoluene 0.0545 mg/kg 0.0500 109 70-130 <br /> Benzene ND 0.005 " <br /> Toluene ND 0.005 " <br /> Xylenes(total) ND 0.010 " <br /> Ethylbenzene ND 0.005 " <br /> LCS(1800495-BS1) Prepared&Analyzed:02/27/08 <br /> Benzene 0.024 mg/kg 0.0250 96 80-120 <br /> LCS Dup(I800495-BSDI) Prepared&Analyzed:02/27/08 <br /> Benzene 0.024 mg/kg 0.0250 96 80-120 0 20 <br /> Matrix Spike(I800495-MS1) Source:1802058-15 Prepared&Analyzed:02/27/08 <br /> Benzene 0.023 mg/kg 0.0250 92 70-130 <br /> Matrix Spike Dup(I800495-MSDI) Source:I802058-15 Prepared&Analyzed:02/27/08 <br /> Benzene 0.022 mg/kg 0.0250 88 70-130 4 20 <br /> Appr wed By <br /> Argo i Laboratories,Inc. California D.O.H.S.Cert.#2359 <br /> 2905 Railroad Avenue, Ceres, CA 95307 e Phone (209) 581-9280 e Fax (209) 581-9282 <br /> email: info@argonlabs.com Page 7 of 11 <br />