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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1855 <br /> Analytical <br /> FAX equoi labs cam www sequoiafabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403078 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/19/04 15 02 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4030129-EPA 5030B,waters <br /> Matrix Spike 4030129-MSI) Source P403007-01 Prepared&Analyzed 03/05/04 <br /> Gasoline Range Organics 559 14 ppmv 780 5 3 71 65-135 <br /> Gasoline Range Organics 1970 50 mg/ml Air 2750 19 71 65-135 <br /> Benzene 11 4 0 16 ppmv 105 ND 109 65-135 <br /> Benzene 362 0 50 mg/ml Air 33 5 ND 108 65-135 <br /> Toluene 55 6 0 13 ppmv 504 0 042 110 65-135 <br /> Toluene 209 0 50 mg/ml Air 190 0 16 110 65-135 <br /> Ethylbenzene 10 6 0 12 ppmv 10 5 ND 101 65-135 <br /> Ethylbenzene 46 0 0 50 mg/ml Air 45 5 ND 101 65-135 <br /> Xylenes(total) 542 0 12 ppmv 51 2 0 19 105 65-135 <br /> Xylenes(total) 235 050 mg/ml Air 222 0 82 105 65-135 <br /> Methyl tent-butyl ether 15 8 0 56 ppmv 15 0 0 028 105 65-135 <br /> Methyl tert butyl ether 56 8 2 0 mg/ml Au 540 ND 105 65-135 <br /> Surrogate a a a-Trifluororoluene 345 11300 115 65-135 <br /> Surrogate a a a-Trifluorotoluene 578 ppmv 503 115 65-135 <br /> Surrogate 4-Bromofluorobenzene 285 mg/m'Atr 300 95 65-135 <br /> Surrogate 4-Bromofluorobenzene 399 ppmv 41 9 95 65-135 <br /> Matrix Spike Dup(4030129-MSD1) Source P403007-01 Prepared&Analyzed 03/05/04 --- <br /> Gasoline Range Organics 1930 50 mg/m'Air 2750 19 69 65-135 2 20 <br /> Gasoline Range Organics 548 14 ppmv 780 5 3 70 65-135 2 20 <br /> Benzene 108 0 16 1. 10 5 ND 103 65-135 5 20 <br /> Benzene 344 050 mg/m'Air 33 5 ND 103 65-135 5 20 <br /> Toluene 520 0 13 ppmv 504 0 042 103 65-135 7 20 <br /> Toluene 195 050 mg/ml Air 190 0 16 103 65-135 7 20 <br /> Ethylbenzene 43 5 0 50 455 ND 96 65-135 6 20 <br /> Ethylbenzene 100 0 12 ppmv 105 ND 95 65-135 6 20 <br /> Xylenes(total) 508 0 12 51 2 0 19 99 65-135 6 20 <br /> Xylenes(total) 220 0 50 mg/m'Air 222 0 82 99 65-135 7 20 <br /> Methyl tert butyl ether 62 3 2 0 540 ND 115 65-135 9 20 <br /> Methyl tert butyl ether 17 3 0 56 ppmv 15 0 0 028 115 65-135 9 20 <br /> Surrogate a a a Trifluorotoluene 328 mg/m'Air 300 109 65-135 <br /> Surrogate a a a Trifluorotoluene 55 0 ppmv 503 109 65-135 <br /> Surrogate 4 Bromofluorobenzene 286 mg/m'Air 300 95 65-135 <br /> Surrogate 4-Bromofluorobenzene 400 ppmv 419 95 65-135 <br /> .Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 15 of 23 <br />