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1455 McDowell Blvd,North Ste D <br /> Sequoia owPetaluma,CA 94954 <br /> (707)792-1865 <br /> '"�'►�`�"' Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento project Arco Site 6020,Manteca,CA P307306 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/18/03 15 20 <br /> Total Petroleum Hydrocarbons as Gasoline 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 3070376-EPA 5030,soils <br /> Blank 3070376-BLK1 Prepared&Analyzed 07/18/03 <br /> Gasoline Range Organics ND 10 mg/kg <br /> Benzene ND 00050 " <br /> Toluene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate a a a-Trifluarotoluene 0 314 0 300 105 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 309 0 300 103 65-135 <br /> Laboratory Control Sample(3070376-BSI) Prepared&Analyzed 07/18/03 <br /> Gasoline Range Organics 2 25 1 0 mg/kg 2 75 82 65-135 <br /> Benzene 0 0339 00050 00400 85 65-135 <br /> Johylbenzene <br /> luene 0 175 00050 „ D 186 94 65-135 <br /> 00390 00050 00470 83 65-135 <br /> Xylenes(total) 0 195 0 0050 0 210 93 65-135 <br /> Surrogate a a a-Trifluorotoluene 0 317 0 300 106 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 317 0 300 106 65-135 <br /> } Matrix S ike 3070376-MS1 Source P307307-01 Prepared&Analyzed 07/18/03 <br /> Gasoline Range Organics 2 36 1 0 mg/kg 275 ND 86 65-135 <br /> Benzene 00353 00050 i; 0 0400 ND 88 65-135 <br /> Toluene 0 182 00050 0 186 000034 98 65-135 <br /> Ethylbenzene 00411 00050 00470 ND 87 65-135 <br /> Xylenes(total) 0 202 00050 0 2 1 0 ND 96 65-135 <br /> Surrogate a a a-Trifluorotoluene 0 316 0 300 105 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 308 0 300 103 65-135 <br /> Matrix Spike Dup(3070376-MSD1) Source P307307-01 Prepared&Analyzed 0_7/18/_0_3_ <br /> Gasoline Range Organics 227 1 0 mg/kg 275 ND 83 65-135 4 20 <br /> Benzene 0 0339 0 0050 00400 ND 85 65-135 4 20 <br /> Toluene 0 176 0 0050 0 186 000034 94 65-135 3 20 <br /> Ethylbenzene 0 0398 0 0050 " 0 0470 ND 85 65-135 3 20 <br /> Xylenes(total) 0 195 0 0050 0 210 ND 93 65-135 4 20 <br /> Surrogate a a a-Trifluorotoluene 0 314 0 300 105 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 308 0 300 103 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 5 of 7 <br />