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lvd North Sic <br /> Sequoia 1455 McDowPealuma CA 949544 <br /> Z— (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> . www scquoialabs com <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 8015B18021B -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 4030128-EPA 5030B,waters <br /> Matrix Spike(4030128-MSI) Source P402528-01 Prepared&Analyzed 03/05/04 <br /> Gasoline Range Organics 2250 50 mg/ml Air 2750 15 81 65-135 <br /> Gasoline Range Organics 639 14 ppmv 780 4 2 81 65-135 <br /> Benzene 365 050 mg/ml Air 33 5 ND 109 65-135 <br /> Benzene 11 4 0 16 ppmv 105 ND 109 65-135 <br /> Toluene 200 050 mg/ml Air 190 ND 105 65-135 <br /> Toluene 53 1 0 13 ppmv 504 ND 105 65-135 <br /> Ethylbenzene 472 050 mg/rn'Air 45 5 ND 104 65-135 <br /> Ethylbenzene 109 0 12 ppmv 105 ND 104 65-135 <br /> Xylenes(total) 51 5 0 12 " 51 2 0 097 100 65-135 <br /> Xylenes(total) 223 050 mere'Air 222 042 100 65-135 <br /> Methyl cert-butyl ether 160 056 ppmv 15 D ND 107 65-135 <br /> Methyl tert-butyl ether 576 2 0 mg/m'Air 540 ND 107 65-1[35 <br /> Surrogate a a a-Trrfluorotoluene 319 300 106 65-135 <br /> Surrogate a a a-Trifluorotoluene 534 ppmv 503 106 65-135 <br /> Surrogate 4-Bromofluorobenzene 301 mg/m'Air 300 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 421 ppmv 419 100 65-135 <br /> Matrix Spike Dup(4030128-MSDI) Source_ P402528-01 Prepared&Analyzed 03/05/04 <br /> Gasoline Range Organics 654 14 ppmv 780 42 83 65-135 2 20 <br /> Gasoline Range Organics 2300 50 mg/ml Air 2750 15 83 65-135 2 20 <br /> Benzene 394 0 50 33 5 ND 118 65-135 8 20 <br /> Benzene 124 0 16 ppmv 10 5 ND 118 65-135 8 20 ! <br /> Toluene 55 9 0 13 " 504 ND 111 65-135 5 20 <br /> i <br /> Toluene 210 0 50 mg/ml Air ][90 ND 111 65-135 5 20 <br /> Ethylbenzene 484 050 455 ND 106 65-135 3 20 <br /> Ethylbenzene 11 2 0 12 ppmv 10 5 ND 107 65-135 3 20 <br /> Xylenes(total) 227 050 mg/m'Air 222 042 102 65-135 2 20 <br /> Xylenes(total) 524 0 12 ppmv 51 2 0 097 102 65-135 2 20 <br /> Methyl tert-butyl ether 205 056 ]so ND 137 65-135 25 20 zQLIM <br /> Methyl tert-butyl ether 73 7 2 0 mg/ml Air 540 ND 136 65 135 25 20 zQLIM <br /> Surrogate a a a-Trifluorotoluene 585 ppmv 503 116 65 135 <br /> Surrogate a a a-Trifluorotoluene 349 mg/m'Air 300 116 65-135 <br /> Surrogate 4-Bromofluorobenzene 434 ppmv 419 104 65-135 <br /> Surrogate 4-Bromofluorobenzene 310 mg/m'Rtr 300 103 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 13 of 23 <br />