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1 <br /> ,1 Sequoia 1455 McDowell Blvd,North Ste D <br /> — ) Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequotalabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Industrial Solvents by EPA Method 8015B modified- Quality Control <br /> Sequoia Analytical-Morgan Hdl <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3L 18016-EPA 3810 Heads ace <br /> Blank 3L18016-BLKl Prepared&Analyzed 12/18/03 <br /> Methanol ND 104 ug/! <br /> Surrogate I-pentanol 2580 2500 103 62-129 <br /> Laboratory Control Sample(3L]8016-BSI) Prepared&Analyzed 12/18/03 <br /> Methanol 889 100 ug/l 1000 88 9 68-130 <br /> Surrogate Ipentanol 2550 2500 102 62-129 <br /> Matrix Spike 3L18016-MS1 Source P312285-01 Prepared&Analyzed 12/18/03 <br /> Methanol 958 100 ug/1 1000 ND 95 8 68-130 <br /> Surrogate I-pentanol 2210 2500 884 62-129 <br /> Matrix Spike Dup(31,18016-MSD11 Source P312285-01 Prepared&Analyzed 12/18/03 <br /> Methanol 916 loo ug/I 1000 ND 91 6 68-130 448 19 <br /> Surrogate 1 pentanol 2330 2500 932 62-129 <br /> Batch 3L22003-EPA 3810 Heads ace <br /> Blank 3L22003-BLK1 Prepared&Anal zed 12/22/03 <br /> Methanol ND 100 ug/l <br /> Surrogate I-pentanol 2720 2500 109 62-129 <br /> Laborato a Control Sample @L22003-BS 1) Prepared&Analyzed 12/22/03 <br /> Methanol 967 100 u911 1000 967 68-130 <br /> Surrogate I-pentanol 2780 2500 111 62-129 <br /> Matrix Spike_(31,22003-MSI) - Source P3_12285-23 Prepared&Analyzed 12/22/03 _ <br /> Methanol 944 loo ug/l 1000 ND 944 68-130 <br /> Surrogate I pentanol 2480 " 1500 992 62-129 <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 /> 0 basis This analytical report must be reproduced in its entirety <br /> Page 23 of 35 <br />