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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> y (707)742-1865 <br /> qWrAnalytical FAX(707)792 0342 <br /> www sequoialabs co- <br /> 7 <br /> om <br /> UR0 Gateway Oaks Drive Suite 300 Project Number WR36619 <br /> S Corp-Sacramento Project Arco Site 6100,Tracy,CA P403162 <br /> 287Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/11/04 11 36 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B18021B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC <br /> Analyte Result Limit Units Level Result %REC Limits :RPD=Lim1t Motes <br /> Batch 4030228-EPA 5030B,waters <br /> Matrix Spike 4030228-MS1 Source P403051-04 Prepared&Analyzed 03/10/04 <br /> Gasolme Range Organics(C6-C 10) 2550 50 mg/m'Air 2750 ND 93 65-135 <br /> Gasoline Range Organics(C6-C 10) 725 14 ppmv 780 2 2 93 65-135 <br /> Benzene 42 6 050 mg/m'Air 320 0 it 133 65-135 <br /> Benzene 13 4 0 16 ppmv 10 0 0 033 134 65-135 <br /> Toluene 604 0 13 " 504 0 064 120 65-135 <br /> Toluene 227 050 mg/m'Air 190 024 119 65-135 <br /> Ethylbenzene 505 050 " 45 5 ND 111 65-135 <br /> Ethylbenzene 11 6 0 12 ppmv 10 5 ND 110 65-135 <br /> Xylenes(total) 55 1 0 12 1151 2 0 040 108 65-135 <br /> Xylenes(total) 239 050 mg/ml Air 222 ND 108 65-135 <br /> Methyl Cert-butyl ether 204 056 ppmv 15 0 0 15 135 65-135 <br /> Nighyl.tert-butyl ether 73 3 2 0 mg/ml Air 54 0 0 54 135 65-135 <br /> agate a a a-Trifluorotoluene 58 0 ppmv 503 115 65-135 <br /> Surrogate a a a-Trifluoro toluene 346 mg/m'Arr 300 115 65-135 <br /> Surrogate 4-Bromofluorobenzene 42 3 ppmv 41 9 101 65-135 <br /> Surrogate 4-Brom ofluoro benzene 302 mg/m'Air 300 101 65-135 <br /> Matrix Spike Du (4030228-MSD1) Source P403051-04 Prepared&Analyzed 03/10/04 <br /> Gasoline Range Organics(C6-C10) 722 14 ppmv 780 2 2 92 65-135 04 20 <br /> Gasoline Range Organics(C6-C10) 2540 50 mg/ml Air 2750 ND 92 65-135 0 4 20 <br /> Benzene 432 050 320 0 11 135 65-135 1 20 <br /> Benzene 13 5 0 16 ppmv 10 0 0 033 135 65-135 0 7 20 <br /> Toluene 231 0 50 mg/ml Air 190 024 121 65-135 2 20 <br /> Toluene 61 5 0 13 ppmv 504 0 064 122 65-135 2 20 <br /> Ethylbenzene 12 0 0 12 10 5 ND 114 65-135 3 20 <br /> Ethylbenzene 52 2 050 mg/ml Air 45 5 ND 115 65-135 3 20 <br /> Xylenes(total) 247 050 " 222 ND 111 65-135 3 20 <br /> Xylenes(total) 57 l 0 12 ppmv 51 2 0 040 111 65-135 4 20 <br /> Methyl tert-butyl ether 64 0 2 0 mg/ml Air 54 0 0 54 118 65-135 14 20 <br /> Methyl tent-butyl ether 17 8 056 ppmv 15 0 0 15 lis 65-135 14 20 <br /> Surrogate a a a-Trifluoro toluene 602 11503 120 65-135 <br /> Surrogate a a a-Trti luorotoluene 359 mg/m'Air 300 120 65-135 <br /> Surrogate 4-Bromofluorobenzene 435 ppmv 41 9 104 65-135 <br /> Surrogate 4-Bromofluorobenzene 311 mg/m'Air 300 104 65-135 <br /> �oia 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 5 of 6 <br />