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1455 McDowell Blvd,North Ste D <br /> a_ _� Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs Com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P406360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 07 39 <br /> Industrial Solvents by EPA Method 8015B modified - Quality Control <br /> Sequoia Analytical _ Morgan Hill <br /> Reporting Spike Source "/REC RPD <br /> Malyte Result Lmut Units Level Result %REC Lanits RPD Limil Notes <br /> Batch 4F23011 -EPA 3810 Headspace <br /> Blank(4F23011-BLKI) Prepared&Analyzed 06/23/04 <br /> Methanol ND� 100 ug/l <br /> Surrogate 1 pentanol 2290 2500 92 62-129 <br /> Laboratory Control Sample(4F23011-BS1) Prepared&Analyzed 06/23/04 <br /> Methanol 964 100 uglt 1000 96 68-130 <br /> Surrogate 1 pentanol 1520 11 .r 2500 101 62-129 <br /> Matrix Spike(4F23011-MSI) Source P406360-04'`tq W 7 Prepared&Analyzed 06/23/04 <br /> Methanol 1450 100 ug/t 1000 500 95 68-130 <br /> Surrogate I-pentanol 2430 11 <br /> 2500 97 / 62-129 <br /> Matrix Spike Dup(4F2301 I-MSD 1) Source P406360-04 mL T Prepared&Analyzed 06/23/04 <br /> —Adethnnol 1530 100 uglt 1000 500 103 68-130 5 r 19 <br /> .gate 1 pentanol 2560 2500 102 62-129 <br /> Batch 4F29007-EPA 3810 Heads ace / <br /> Blank(4F29007-BLKI) Prepared&Analyzed 06/29/04 <br /> Methanol ND 100 ug/l <br /> Surrogate I-pentanol 2520 2500 101 62-129 <br /> Laboratory Control Sample(4F29007-BSI) Prepared&Analyzed 06/29/04 <br /> Methanol 949 100 ngA 1000 95 -� 68-I30 <br /> Surrogate 1 pentanol 2560 2500 102 62-129 <br /> Matrix Spike(4F29007-MS1) Source P406360-04 Prepared&Analyzed 06/29/04 <br /> Methanol 1490 100 u9A 1000 590 90 / 68-130 <br /> Surrogate 1 pentanol 2620 2500 105 62-129 <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 werght basis <br /> 0 Thrs analytical report must be reproduced in its entirety <br /> Page 13 of 21 <br />