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it <br /> eD (707) <br /> 1455 McDowell Blvd , CASequoia Petalumaorth Ste, CA 4495444 792-1865 <br /> Analytical FAX(707)792-0342 <br /> (� www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P307150 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/23/03 16 39 <br /> Total Petroleum Hydrocarbons as Gasoline 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 3070137-EPA 5030,waters <br /> Blank(3070137-BLKI) Prepared&Analyzed 07/10//03 _ <br /> Gasoline Range Organics ND 50 mg/ml Air <br /> Gasoline Range Organics ND 14 ppmv <br /> Benzene ND 016 " <br /> Benzene ND 0 50 mg/ml Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 050 mg/m'Air <br /> Ethylbenzene ND 050 " <br /> Ethylbenzene ND 012 ppmv <br /> Xylenes(total) ND 050 mg/m'Air <br /> Xylenes(total) ND 0 12 ppmv <br /> Methyl tert-butyl ether ND 2 0 mg/ml Air <br /> �Jaethyl tort-butyl ether ND 056 ppmv <br /> Surrogate a a a-Trifluorotoluene 300 mg/m3 Air 300 100 65-135 <br /> Surrogate a a,a-Trifluorotoluene 503 ppmv 503 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 421 419 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 301 mg/m'Air 300 100 65-135 <br /> Laboratory Control Sample(3070137-BS1) Prepared&Analyzed 07/10/03 <br /> Gasoline Range Organics 715 14 ppmv 780 92 65-135 <br /> Gasoline Range Organics 2520 50 mg/ml Air 2750 92 65-135 <br /> Bmzene 13 3 016 ppmv 125 106 65-135 <br /> Benzene 425 050 mglm'Air 400 106 65-135 <br /> Toluene 222 050 186 119 65-135 <br /> Toluene 59 1 0 13 ppmv 493 120 65-135 <br /> Ethylbenzene 10 5 012 108 97 65-135 <br /> Ethylbenzene 45 5 050 mg/ml Air 470 97 65-135 <br /> Xylenes(total) 54 8 0 12 ppmv 48 6 113 65-135 <br /> Xylenes(total) 238 050 mg/ml Air 210 113 65-135 <br /> Methyl text-butyl ether 16 9 056 ppmv 172 98 65-135 <br /> Methyl tert-butyl ether 60 7 2 0 mg/m'Air 620 98 65-135 <br /> Surrogate a a,a-Trifluorotoluene 576 ppmv 503 115 65-135 <br /> Surrogate a a,a-Trifluorotoluene 344 mg/m'Air 300 115 65-135 <br /> Surrogate 4-Bromofluorobenzene 322 300 107 65-135 <br /> Surrogate 4-Bromofluorobenzene 451 ppmv 419 108 65-135 <br /> equola Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> l 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 10 of 16 <br />