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Sequoia 1455 McDowell plum North <br /> eia Ste <br /> ''`►-'�'' Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical www <br /> sequ7) labs c 42 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/14/05 16 07 <br /> Purgeable Hydrocarbons by EPA 8015B -Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source '/oREC RPD <br /> Analyte Result Limit Units Level Result °/JWC Limns RPD Limit Notes <br /> Batch 5040054-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(5040054-BLK1) Prepared&Analyzed 04/06/05 <br /> Gasoline Range Organics(C4-C 12) ND 50 ugA <br /> Surrogate 4-Bromofluorobenzene 283 300 94 80-110 <br /> Laboratory Control Sample(5040054-BS1) Prepared&Analyzed 04/06/05 <br /> Gasoline Range Organics(C4-C 12) 2440 50 ugA 2750 89 609-120 <br /> Surrogate 4-Bromofluorobenzene 305 300 102 80-110 <br /> Matrix Spike(5040054-MS1) Source P504013-03 Prepared&Analyzed 04/06/05 <br /> Gasoline Range Organics(C4-C12) 2370 50 upfl 2750 ND 86 609-120 <br /> Surrogate 4-Bromofluorobenzene 299 300 100 80-110 <br /> Matrix Spike Du (5040054-MSDI) Source P504013-03 Prepared&Analyzed 04/06/05 <br /> Gasoline Range Organics(C4-C 12) 2330 50 ugA 2750 ND 85 609-120 2 20 <br /> arrogate 4-Bromofluorobenzene 305 300 102 80-110 <br /> Batch 5040101-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(5040101-BLKI) Prepared&Analyzed 04/12/05 <br /> Gasoline Range Organics(C4-C12) ND 50 ugA <br /> Surrogate 4-Bromofluorobenzene 252 300 84 80-110 <br /> Laboratory Control Sample(5040101-BSI) Prepared&Analyzed 04/12/05 <br /> Gasoline Range Organics(C4-C 12) 2710 50 ugA 2750 99 609-120 <br /> Surrogate 4-Bromofluorobenzene 276 300 92 80-110 <br /> Matrix Spike(5040101-MSI) Source P504057-04 Prepared&Analyzed 04/12/05 <br /> Gasoline Range Organics(C4-C 12) 2730 50 ugA 2750 ND 99 609-120 <br /> Surrogate 4-Bromofluorobenzene 273 300 91 80-110 <br /> Sequoia Analytical-Petaluma The results in 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 entrrety <br /> Page 12 of 20 <br />