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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> ,i/ Analytical FAX(707) <br /> 792 0342www <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P305591 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/05/03 16 20 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/802113-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 3050782-EPA 5030,waters <br /> Matrix Spike(3050782-MSI) Source P305424-01 Pre ared&Analyzed 05/31/03 <br /> Gasoline Range Organics 2580 50 mg/ml Air 2750 180 87 65-135 <br /> Gasoline Range Organics 733 14 ppmv 780 52 87 65-135 <br /> Benzene 29 8 0 16 125 21 70 65-135 <br /> Benzene 95 0 0 50 mg/m'Air 400 65 75 65-135 <br /> Toluene 53 5 0 13 ppmv 493 ND 109 65-135 <br /> Toluene 201 0 50 mg/m'Air 186 ND 108 65-135 <br /> Ethylbenzene 11 2 0 12 ppmv 10 8 041 100 65-135 <br /> Ethylbenzene 48 6 050 mg/m'Air 470 1 8 100 65-135 <br /> Xylenes(total) 217 050 " 210 3 7 102 65-135 <br /> Xylenes(total) 50 1 012 ppmv 48 6 0 86 101 65-135 <br /> ethyl tert-butyl ether 18 8 056 " 17 2 ND 109 65-135 <br /> ethyl tert-butyl ether 67 6 2 0 mg/ml Air 620 1 0 107 65-135 <br /> Surrogate a,a,a-Trifluorotoluene .55.5 ppmv .503 110 65-135 <br /> Surrogate a,a a-Trifluorotoluene 331 mg/m'Air 300 110 65-135 <br /> Surrogate 4-Bromofluorobenzene 429 ppmv 419 102 65-135 <br /> Surrogate 4-Bromofluorobenzene 307 mg/m'Air 300 102 65-135 <br /> Matrix Spike Du 3050782-MSD/ Source P305424-01 Prepared&Analyzed 05/31/03 <br /> Gasoline Range Organics 2600 50 mg/m'Air 2750 180 88 65-135 0 8 20 <br /> Gasoline Range Organics 739 14 ppmv 780 52 88 65-135 0 8 20 <br /> Benzene 99 5 050 mg/m'Air 400 65 86 65-135 5 20 <br /> Benzene 31 2 0 16 ppmv 125 21 82 65-135 5 20 <br /> Toluene 207 0 50 mg/ml Air 186 ND 111 65-135 3 20 <br /> Toluene 55 0 0 13 ppmv 49 3 ND 112 65-135 3 20 <br /> Ethylbenzene 492 050 mg/ml Air 470 1 8 101 65-135 1 20 <br /> Ethylbenzene 11 4 0 12 ppmv 108 041 102 65-135 2 20 <br /> Xylenes(total) 53 1 0 12 486 0 86 107 65-135 6 20 <br /> Xylenes(total) 230 050 mg/ml Air 210 3 7 108 65-135 6 20 <br /> Methyl tert-butyl ether 696 2 0 620 1 0 111 65-135 3 20 <br /> Methyl tert-butyl ether 19 4 056 ppmv 172 ND 113 65-135 3 20 <br /> Surrogate a,a,a-Trifluorotoluene 548 " 503 109 65-135 <br /> Surrogate aa,a-Trtfluorotoluene 327 mg/m'Air 300 109 65-135 <br /> Surrogate 4-Bromofluorobenzene 41 9 ppmv 419 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 300 mg/m'Air 300 100 65-135 <br /> equola 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 7 of 8 <br />