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885 Jarvis Drive <br /> Morgan C 95037 <br /> Sequoia (40408)777 6 9600 <br /> AFAXsz 6sos <br /> Analytical <br /> www sequoiaquoiala6s cam <br /> • <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Protect Number Arco X2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Protect Manager Brian Carey 03/31/06 14 03 <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 °/aREC Limits RPD Limit Notes <br /> Batch 6C12001 -EPA 3810 Heads ace I EPA 8015B <br /> Blank(6C12001-BLKI) Prepared&Analyzed 03/12/06 <br /> Methanol ND 100 ugA <br /> Surrogate !pentanol 2160 1500 86 75-110 <br /> Laboratory Control Sample(602001-13SI) Prepared&Analyzed 03/12/06 <br /> Methanol 937 100 ugA 1000 - - -- 94- -30-150 - <br />-Surrogate -1 pentanol --2440 —2500 - 98- 75-120 <br /> `Matrix Spike(6C120fl1=MS1) - <br /> ----Source MPC0117-06- Prepared&Analyzed 03/12_/0.6 <br /> Methanol 908 100i'ug/11000 Nd 91 30-150 <br /> Suri ogaie !-pentanol 2340 112500 94 75-120 <br /> Matrix Spike Dup(6CI2001-MSDI) Source MPC0117-06 Prepared&Analyzed 03/12/06 <br /> Methanol 994 IOD ugA 1000 ND 99 34-150 9 20 <br /> Surrogate !-pentanol 2470 2500 99 75-120 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain off <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 8 of 20 <br />