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885 Drive <br /> Sequoia Morgan Hilt1,,CA CA 950375037 <br /> (408)776 00 <br /> Analytical WWw sequo,792 l63abscom <br /> Secor-Rancho Cordova(ARCO) Project ARCO 114932,Stockton,CA MND0090 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager RustyBenkosky 04/19/04 17 58 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B18021B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4DO7003-EPA 50308 [P/TI <br /> Blank(4D07003-BLK1) Prepared&Analyzed 04/07/04 <br /> Gasoline Range Organics(C4 C 12) ND 10 mg/ml Air <br /> Gasoline Range Organics(C4 C 12) ND 24 ppmv <br /> Benzene ND 010 mg/ml Air <br /> Benzene ND 0 031 ppmv <br /> Toluene ND 0 027 " <br /> Toluene ND 010 mg/ml Air <br /> Ethylbenzane ND 0 023 ppmv <br /> Ethylbenzene ND 010 mglm'Air <br /> Xylenes(total) ND 0 047 ppmv <br /> Xylenes(total) ND 020 mg/m'Air <br /> Methyl tent-butyl ether ND 014 ppmv <br /> Methyl tert butyl ether ND 050 mg/ml Air <br /> Surrogate a a a-Tris luorotaluene 792 800 99 0 56 134 <br /> Surrogate aria-Trac luororoluene 133 ppmv 134 993 56 134 <br /> Surrogate 4-Bromofluorobenzene 6 70 mg/m'Air 800 838 70-130 <br /> Surrogate 4-Bromofluorobenzene 09.37 ppmv 112 B37 70-130 <br /> Laboratory Control Sample(4D07003-BS1) Prepared&Analyzed 04/07/04 <br /> Benzene 0 548 0 031 ppmv 0 627 87 4 62 125 <br /> Benzene 175 010 mg/ml Air 200 875 62-125 <br /> Toluene 0 537 0 027 ppmv 0 532 101 68-121 <br /> Toluene 2 02 010 mg/ml Air 200 101 68-121 <br /> Ethylbenzene 211 010 " 200 106 75-125 <br /> Ethylbenzene 0 488 0 023 ppmv 0 462 106 75-125 <br /> Xylenes(total) 150 0 047 138 109 76-121 <br /> Xylencs(total) 650 020 mg/m'Air 600 108 76-121 <br /> Surrogate a a a-7}ifluorotoluene 134 ppmv 134 100 56-134 <br /> Surragale a a a-Tri luorotoluene 798 mg/m'Air 800 998 56 134 <br /> Surrogate 4 Bromofluorobenzene 0 955 ppmv 112 853 70-130 <br /> Surrogate 4-Bromofluorobenzene 683 mg/m'Air 8 00 85 4 70-130 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the Cham of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> 1 <br /> Page 11 of 15 <br />