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885 Jarvis Drive <br /> a_ _� Sequoia Morgan(408)7769600 <br /> Analytical FAX cquoi lab 6308 <br /> coin www sequoiaiabs com <br /> • <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO246 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/11/06 09 55 <br /> Industrial Solvents by EPA Method 8015B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6C10008- EPA 3810 Headspace 1 EPA 8015B <br /> Blank (6CI0008-BLKI) Prepared&Analyzed 03/10/06 <br /> Methanol ND 10 mg/kg <br /> Surrogate 1-pentanol 102 100 102 55-140 <br /> Laboratory Control Sample(600008-BSI) Prepared&Analyzed 03/10/06 <br /> f Methanol -- - - - — — __ - 927 ' 10 mg/kg - too f -_ - -- 93=-- --65-140 - <br />�.Surrogate=1 pentanol 963 11100 98 55-140 <br /> ---Matrix Spike(600008-MS0— _ _ -Source MPCO246-05_ _.. ____. Prepared.&Analyzed 03/10/06 - <br />—Metlianot 8 60 1 0=mg/kg 10 0 ND 86 65-140 <br /> Surrogate I-pentanol 933 100 93 55-140 <br /> Matrix Spike Dup(6C10008-MSD1) Source MPCO246-05 Prepared&Analyzed 03/10/06 <br /> Methanol 8 11 10 mg/kg too ND 81 65-140 6 25 <br /> Surrogate 1-pentanol 881 100 88 55-140 <br /> Sequoia Analytical - Morgan Hill The results in this report apply to the samples analysed in accordance with the chain 0 <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 17 of 28 <br />