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1� <br /> *P <br /> �"� 1455 McDowell Blvd,North Ste D <br /> ,!DSequoia Petatuma,CA94954 <br /> (707)792-1865 <br /> Auaytical FAX(707)792.0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 434,Lodi,CA P306214 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim 50433 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/16/03 16 01 <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 Llmlt Units Level Result °/.REC Limits RPD Limit Notes <br /> Batch 3060315-EPA 5030,waters <br /> Blank(3060315-BLK1) Prepared&Analyzed 06/13/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate a a a-Trrfluorotoluene 303 300 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 279 300 93 65-135 <br /> Laboratory Control Sample(3060315-BSI) Prepared&Analyzed 06/13/03 <br /> Gasoline Range Organics 2750 50 ug/l 2750 100 65-135 <br /> Benzene 32 5 050 33 5 97 65-135 <br /> W <br /> luene 220 050 202 109 65-135 <br /> hylbenzene 510 050 " 47,5 107 65-135 <br /> Xylenes(total) 241 050 240 100 65-135 <br /> Surrogate a a a-Trifluorololuene 345 300 115 65-135 <br /> Surrogate 4-Bromofluorobenzene 306 300 102 65-135 <br /> Matrix Spike(3060315-MSI) Source P306065-01 Prepared&Analyzed 06/13/03 <br /> Gasoline Range Organics 2710 50 ug/I 2750 ND 99 65-135 <br /> Benzene 34 0 050 33 5 ND 101 65-135 <br /> Toluene 228 0 50 202 ND 113 65-135 <br /> Ethylbenzene 51 8 050 475 ND 109 65-135 <br /> Xylenes(total) 243 050 240 ND 101 65-135 <br /> Surrogate a a a-Tnfluorotoluene 352 300 117 65-135 <br /> Surrogate 4-Bromofluorobenzene 300 300 100 65-135 <br /> Matnx Spike Dup(3060315-MSD1) Source P306065-01 Prepared&Analyzed 06/13/03 <br /> Gasoline Range Organics 2510 50 ug/l 2750 ND 91 65-135 8 20 <br /> Benzene 350 050 335 ND 104 65-135 3 20 <br /> Toluene 217 0 50 202 ND 107 65-135 5 20 <br /> Ethylbenzene 511 050 475 ND 108 65-135 1 20 <br /> Xylenes(total) 241 050 240 ND 100 65 135 08 20 <br /> Surrogate a a a-Trifluorotoluene 333 300 111 65-135 <br /> Surrogate 4-Bromofluorobenzene 291 300 97 65-135 <br /> .Sequoia Analytical-Petaluma The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entireiy <br /> Page 7 of 10 <br />