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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> x Analytical FAX(707)792 0342 <br /> www sequmalabs com <br /> i <br /> URS Corp-Sacratnento Project Arco Site 6100,Tracy,CA P403161 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/11/0411 27 <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 Limit Notes <br /> Batch 4030228-EPA 5030B,waters <br /> Matrix S ike 4030228-MS1 Source P403051-04 Prepared&Analyzed 03/10/04 <br /> Gasolme Range Organu,s(C6-C10) 2550 50 mg/m3 Air 2750 ND 93 65-135 <br /> Gasoline Range Organics(C6-C10) 725 14 ppmv 780 2 2 93 65-135 <br /> Benzene 426 0 50 mg/m'Air 32 0 0 11 133 65-135 <br /> Benzene 13 4 0 16 ppmv 10 0 0 033 134 65-135 <br /> Toluene 604 0 13 " 50 4 0 064 120 65-135 <br /> Toluene 227 0 50 mg/m'Air 190 0 24 119 65-135 <br /> Ethylbenzene 50 5 0 50 45 5 ND ill 65-135 <br /> Ethylbenzene 11 6 0 12 ppmv 10 5 ND 110 65-135 <br /> Xylenes(total) 55 1 0 12 " 51 2 0 040 108 65-135 <br /> Xylenes(total) 239 0 50 mg/m3 Air 222 ND 108 65-135 <br /> Methyl tert-butyl ether 204 0 56 ppmv 15 0 0 15 135 65-135 <br /> Idwhyl.tert-butyl ether 73 3 2 0 mg/m'Air 54 0 054 135 65-135 <br /> ogate a a a-Trifluorotoluene 580 ppmv 503 115 65-135 <br /> Surrogate a a a-Trifluorotoluene 346 mg/m'Air 300 115 65-135 <br /> Surrogate 4-Bromofluorobenzene 42 3 ppmv 41 9 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 302 mg/m'Air 300 101 65-135 <br /> Matrix Spike Dup(4030228-MSD1) Source P403051-04 Prepared&Analyzed 03/10/04 <br /> Gasoline Range Organics(C6-C 10) 722 14 ppmv 780 2 2 92 65-135 0 4 20 <br /> Gasoline Range Organics(C6-C10) 2540 50 mg/m'Air 2750 ND 92 65-135 0 4 20 <br /> Benzene 43 2 0 50 " 32 0 0 11 135 65-135 1 20 <br /> Benzene 13 5 0 16 ppmv 100 0 033 135 65-135 0 7 20 <br /> Toluene 231 0 50 mg/m'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 120 0 12 " 105 ND 114 65-135 3 20 <br /> Ethylbenzene 522 0 50 mg/m'Air 45 5 ND 115 65-135 3 20 <br /> Xylenes(total) 247 0 50 222 ND 111 65-135 3 20 <br /> Xylenes(total) 57 1 0 12 ppmv 51 2 0 040 ill 65-135 4 20 <br /> Methyl tert-butyl ether 640 2 0 mg/m'Air 540 054 118 65-135 14 20 <br /> Methyl tert-butyl ether 178 0 56 ppmv 15 0 0 15 118 65-135 14 20 <br /> Surrogate a a a-Trri luorotoluene 602 11 503 120 65-135 <br /> Surrogate a a a-Trifluorotoluene 359 mglm'Air 300 120 65-135 <br /> Surrogate 4-Brom ofluoro benzene 435 ppmv 41 9 104 65-135 <br /> Surrogate 4-Brom ofluoro benzene 311 mg/m'Air 300 104 65-133 <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 />