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Sequoia 1455 McDowell Blvd,North Ste D <br /> 4DPetaluma CA 94954 <br /> Analytical (707)792 1865 <br /> FAX(707)192 0342 <br /> WWW sequoiala6s� <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P311307- <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/01/03 15 25 <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 Lints Notes <br /> Batch 3110312-EPA 5030,waters <br /> Matrix Spike(3110312-MSI) - Source P311131.01 Prepared&Analyzed 11/14/03 <br /> Gasoline Range Organics 645 14 ppmv 780 4 6 82 65-135 <br /> Gasoline Range Organics 2270 50 mg/m'Air 2750 16 82 65 135 <br /> Benzene 11 7 0 16 ppmv 127 0 046 92 65-135 <br /> Benzene 374 050 mg/m'Air 405 0 15 92 65-135 <br /> Toluene 209 0 50 208 ND 100 65-135 <br /> Toluene 55 4 0 13 ppmv 554 ND 100 65-135 <br /> Ethylbenzene 102 0 12 " 104 ND 98 65-135 <br /> Ethylbenzene 44 2 0 50 mg/m'Air 45 0 ND 98 65-135 <br /> Xylenes(total) 526 0 12 ppmv 502 ND 105 65-135 <br /> Xylenes(total) 228 050 mg/ml Air 218 ND 105 65 135 <br /> Methyl tort-butyl ether 192 0 56 ppmv 175 0 055 109 65-135 <br /> Methyl tert-buty[ether 69 1 2 0 mg/ml Air 63 0 0 20 109 65-135 <br /> Surrogate a a a-Trrfluorotoluene 53 6 ppmv 503 107 65-135 <br /> Surrogate a a a-Trifluorotoluene 320 mg/m'Air 300 107 65 135 <br /> Surrogate 4-Bromofluorobenzene 411 ppmv 419 98 65-135 <br /> Surrogate 4-Bromofluorobenzene 294 mg/m'Air 300 98 65-135 <br /> Matrix Spike Du 3110312-MSDI Source P311131-01 Prepared&Anal ed 11/14/03 <br /> Gasoline Range Organics 2170 50 mg/ml Air 2750 16 78 65-135 5 20 <br /> Gasoline Range Organics 617 14 ppmv 780 4 6 79 65-135 4 20 <br /> Benzene 11 3 0 16 11 12 7 0 046 89 65-135 3 20 <br /> Benzene 360 050 mg/ml Air 405 0 15 89 65-1[35 4 20 <br /> Toluene 203 0 50 208 ND 98 65-135 3 20 <br /> Toluene 53 9 0 13 ppmv 554 ND 97 65-135 3 20 <br /> Ethylbenzene 424 0 50 mg/ml Air 450 ND 94 65-135 4 20 <br /> Ethylbenzene 9 79 0 12 ppmv 104 ND 94 65-135 4 20 <br /> Xylenes(total) 220 0 50 mg/ml Air 218 ND 101 65-135 4 20 <br /> Xylenes(total) 507 0 12 ppmv 502 ND 101 65-135 4 20 <br /> Methyl tert-butyl ether 674 2 0 mg/ml Air 630 020 107 65-135 2 20 <br /> Methyl tert-butyl ether 18 7 0 56 ppmv 175 0 055 107 65-135 3 20 <br /> Surrogate a a a-Trifluorotoluene 310 mg/m'Air 300 103 65-135 <br /> Surrogate a a,a-TriJluorotoluene 519 ppmv 503 103 65-135 <br /> Surrogate 4-Bromofluorobenzene 416 11 419 99 65-135 <br /> Surrogate 4-Bromofluorobenzene 298 mg/m'Air 300 99 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply pply to the samples analyzed in accordance with the chain <br /> ofeustody document Unless otherwise stated,results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 1 I of 15 <br />