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885 Jarvis Dave <br /> Sequoia Morgan Hill CA 95037 <br /> 4D (408)776 9600 <br /> Analytical FAX(408)782-6308 <br />' www sequoialabs com <br />' ETIC Engineering Inc-Pleasant Hill(Exxon) Project Exxon 7-3942 MOJ0913 <br /> 2285 Morello Avenue Project Number Exxon 7-3942 Reported <br /> Pleasant Hill CA,94523 Project Manager Ted Moise 11/09/05 15 08 <br /> Total Metals by EPA 200 Series Methods - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Evaluation Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5J17029-EPA 3005A <br />' Blank(5J17029-BLK1) Prepared 10/17/05 Analyzed 10/20/05 <br /> Sodium 0 449 025 mg/1 A-01 <br /> Magnesium ND 005 <br /> Potassium ND 1 " <br /> Calcium ND 025 " <br /> Iron ND 005 " <br /> LCS(Ml.7029-13SI) Prepared 10/17/05 Analyzed 10/19/05 <br /> Iron 0 959 0 10 mg/l 1 00 96 85-115 <br /> Calcium 102 050 100 102 85-115 <br /> Magnesium 104 010 100 104 85-115 <br /> mm <br /> 990 20 100 98 85-115 <br /> m <br /> 103 050 " 100 103 85-115 A-01 <br /> Matrix Spike(5J17029-MSI) Source MOJ0913-01 Prepared 10/17/05 Analyzed 10/19/05 <br /> Magnesium 587 0 10 mg/1 100 49 97 85-115 QM04 <br /> Sodium 395 0 50 100 30 95 85-115 A-01 <br /> Calcium 117 050 100 100 170 85-115 QM01 <br /> Iron 883 0 10 1 00 89 -7 85-115 QM02 <br /> Potassium 1 1 2 20 100 37 75 85-115 QM02 <br />' Matrix Spike Dup(5J17029-MSD1) Source MOJ0913-01 Prepared 10/17/05 Analyzed 10/19/05 <br /> Magnesium 59 1 0 10 mg/I 100 49 101 85-115 07 20 QM08 <br /> Calcium 118 050 100 100 180 85-115 09 20 QM04 <br /> Sodium 398 050 100 30 98 85-115 08 20 A-01 <br /> Iron 848 010 100 89 42 85-115 4 20 QM05 <br /> IPotassium 109 20 too 3 7 72 85-115 3 20 QM07 <br /> �1a Analytical -Morgan Hill 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 This <br /> analytical report must be reproduced in its entirety <br /> Page 44 of 80 <br />