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1455 McDowell Blvd,North Ste D <br /> a— ) <br /> Sequoia Petaluma CA 94954 <br /> qWAnalytical (707)792-1$65 <br /> FAX(707)792.4342 <br /> www sequoiala6s co <br /> � <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 8015BI8021B-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 /> Blank(4030129-BLK1) Prepared&Analyzed 03/05/04 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/ml Air <br /> Benzene ND 016 ppmv <br /> Benzene ND 050 mg/ml Air <br /> Toluene ND 050 " <br /> Toluene ND 013 ppmv <br /> Ethylbenzene ND 012 " <br /> Ethylbenzene ND 0 50 mg/m3 Air <br /> Xylenes(total) ND 050 " <br /> Xylenes(total) ND 0 12 ppmv <br /> Methyl tert-butyl ether ND 056 " <br /> Methyl tert-butyl ether ND 20 mg/ml Air <br /> Surrogate a a a-Trifluorotoluene 321 ppmv 503 104 65-135 <br /> Surrogate a a a-Trifluorotoluene 311 mg/m'Air 300 104 65-135 <br /> Surrogate 4-BromoJluorobenzene 283 11300 94 65-135 <br /> Surrogate 4-Bromofluorobenzene 396 ppmv 41 9 95 65-135 <br /> Laboratory Control Sample 4030129-BS1 Prepared&Analyzed 03/05/04 <br /> Gasoline Range Organics 2050 50 mg/ml Air 2750 75 65-135 <br /> Gasoline Range Organics 581 14 ppmv 780 74 65-135 <br /> Benzene 380 050 mg/ml Air 33 5 113 65-135 <br /> Benzene 11 9 0 16 ppmv 105 113 65-135 <br /> Toluene 562 0 13 1, 50 4 112 65-135 <br /> Toluene 211 050 mg/ml Air 190 111 65-135 <br /> Ethylbenzene 452 050 45 5 99 65 135 <br /> Ethylbenzene 104 0 12 ppmv 10 5 99 65-135 <br /> Xylenes(total) 542 0 12 " 51 2 106 65-135 <br /> Xylenes(total) 235 050 mg/m'Air 222 106 65-135 <br /> Methyl tert-butyl ether 173 056 ppmv 15 0 115 65-135 <br /> Methyl tert-butyl ether 62 3 2 0 mg/ml Air 540 115 65-135 <br /> Surrogate a a a-Trifluorotoluene 577 ppmv 503 115 65-135 <br /> Surrogate a a a-Trifluorotoluene 344 mg/m3 Air 300 115 65-135 <br /> Surrogate 4-Bromof7uorobenzene 411 ppmv 419 98 65-135 <br /> Surrogate 4-Bromofluorobenzene 294 mg/m'Air 300 98 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 14 of 23 <br />