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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,07)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P305040 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/15/03 20 19 <br /> Total Petroleum Hydrocarbons as Gasoline 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 3050178-EPA 5030,waters <br /> Blank 3050178-BLKI Pr ared&Analyzed 05/07/03 <br /> Gasoline Range Organics 160 50 ug/1 <br /> Benzene 0 155 0 50 " <br /> Toluene 0 192 050 " <br /> Ethylbenzene 0206 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 291 300 97 65-135 <br /> Surrogate 4-Bromofluorobenzene 199 300 100 65-135 <br /> Laboratory Control Sample(3050178-BSI) Prepared&Analyzed 05/07/03 <br /> Gasoline Range Organics 2170 50 U94 2750 79 65-135 <br /> Benzene 36 8 0 50 40 0 <br /> 92 65-135 <br /> 6 oluene 205 0 50 186 <br /> hylbenzene 433 0 50 47 0 92 65-135 <br /> 92 65-135 <br /> Xylenes(total) 224 050 210 107 65-135 <br /> Surrogate a,a,a-Trifluorotoluene 327 300 109 65-135 <br /> Surrogate 4-Bromofluorobenzene 321 300 107 65-135 <br /> Matrix Spike(3050178-MS1) Source P305040-01 Prepared&Analyzed 05/07/03 <br /> Gasoline Range Organics 2090 50 ug/l 2750 18 75 65-135 <br /> Benzene 35 3 0 50 400 ND 89 65-135 <br /> Toluene 201 050 I86 027 108 65-135 <br /> Ethylbenzene 43 0 0 50 470 ND 91 65-135 <br /> Xylenes(total) 220 050 210 ND 105 65-135 <br /> Surrogate a a a-Trtfluorotoluene 331 300 110 65-135 <br /> Surrogate 4-Bromof7uorobenzene 310 300 103 65-135 <br /> Matrix Spike Du (3050178-MSDl) Source P305040-01 _____Erepared&Analyzed 05/07/03 <br /> Gasoline Range Organics 1880 50 U91 2750 18 68 65-135 11 20 <br /> Benzene 33 3 050 400 ND 83 65-135 6 20 <br /> Toluene 191 0 50 186 027 103 65-135 5 20 <br /> Ethylbenzene 407 0 50 470 ND 87 65-135 5 20 <br /> Xylenes(total) 210 0 50 210 ND 100 65-135 5 20 <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 8 of 12 <br />