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♦r V <br /> Sequoia 1455 McDowell alumavd,NCA 949544 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs wm <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P401386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/29/04 19 13 <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 Nates <br /> ] <br /> Batch 4010498-EPA 5035,soil <br /> Blank(4010498-BLS Prepared&Analyzed 01/27/04 <br /> Gasoline Range Organics ND 1 0 mg/kg <br /> Benzene ND 0 0050 " <br /> Toluene ND 0 0050 " <br /> Ethylbenzene ND 0 0050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate a a a-Trifluorotoluene 0 303 0 300 101 65-135 <br /> Surrogate 4-Bromofluorobenzene0 267 0 300 89 65-135 <br /> Laboratory Control Saru&,(4010498-BSI) Prepared&Analyzed 01/27/04 <br /> Gasoline Range Organics 2 28 1 0 mg/kg 2 75 83 65-135 <br /> Benzene 0 0430 00050 0 0400 108 65-135 <br /> OToluene 0209 00050 0 186 112 65-135 <br /> thylbenzene 0 0502 00050 0 0435 115 65-135 <br /> Xylenes(total) 0 241 00050 0 210 115 65-135 <br /> Surrogate a a a-Tr�fluorotoluene 0 296 0 300 99 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 263 0 300 88 65-135 <br /> _Matrix Spike(4010498-MS1_) Source P401269-01 Prepared&Analyzed 01/27/04 _ <br /> Gasoline Range Organics 1 49 1 0 mg/kg 2 75 0 031 53^ 65-135 QM-RX <br /> Benzene 00298 0 0050 00400 ND 74 65-135 <br /> Toluene 0 145 0 0050 0 186 ND 78 65-135 <br /> Ethylbenzene 00343 0 0050 0 0435 000040 78 65-135 <br /> Xylenes(total) 0 167 0 0050 0 210 00027 78 65-135 <br /> Surrogate a a a-Trifluorotoluene 0 215 " 0 300 72 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 193 0 300 64 65-135 S-04 <br /> Matrix Spike(4010498-MS2) Source_P40.1269-01 Prepared&Analyzed_ 01/27/_04 <br /> Gasoline Range Organics 2 05 l 0 mg/kg 275 0 031 73 65-135 <br /> Benzene 0 0422 0 0050 00400 ND 106 65-135 <br /> Toluene 0 208 0 0050 0 186 ND 112 65-135 <br /> Ethylbenzene 0 0480 0 0050 0 0435 0 00040 109 65-135 <br /> Xylenes(total) 0 231 00050 0 210 0 0027 109 65-135 <br /> Surrogate a a a-Tris luorotoluene 0 301 0 300 100 65-135 <br /> Surrogate 4-Bromafluorobenzene 0 238 " 0 300 79 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 an a wet weight <br /> 40 basis This analytical report must be reproduced in its entirety <br /> Page 5 of 8 <br />