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885 Jarvis Drive <br /> Sequoia Morgan Hill C95037 <br /> (408)7776-4600 <br /> FAX' 6308Analytical wwwsequoalabs <br /> 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 6000/7000 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 5J17008-General Preparation <br /> Blank(5J17008-BLK1) Prepared&Analyzed 10/14/05 <br /> Hexavalent Chromium ND 030 ug/l <br />' LCS(M17008-BSI) Prepared&Analyzed 10/14/05 <br /> Hexavalent Chromium 492 050 u9A 500 98 75-125 <br /> Duphcate(5J17008-DUP1) Source MOJ0913-01 Prepared&Analyzed 10/14/05 <br />' Hexavalent Chromium ND 050 ug/l ND 20 <br /> Matrix Spike(M17008-MSI) Source MOJ0913-01 Prepared&Analyzed 10/14/05 <br /> fHexavalent Chromium 468 050 ugA 500 ND 94 75-125 <br /> Batch 5J21007-EPA 7470A <br /> fBlank(5J21007-BLK1) Prepared&Analyzed 10/21/05 <br /> Wry ND 01 ug/l <br /> LCS(5J21007-BS1) Prepared&Analyzed 10/21/05 <br /> fMercury 848 020 ug/l 800 106 80-120 <br /> Matrix Spike(5J21007-MS1) Source MOJ0913-07 Prepared&Analyzed 10/21/05 <br /> Mercury 861 020 ug/1 800 ND 108 80-120 <br /> I <br /> f Matrix Spike Dup(5J21007-MSD1) Source MOJ0913-07 Prepared&Analyzed 10/21/05 <br /> Mercury 861 020 ug/1 800 ND 108 80-120 0 25 <br /> f <br /> f <br /> f <br /> f <br /> I <br /> oia Analytical -Morgan Hill The results in this report apply to the samples analyzed to accordance with the chain of <br /> I custody document Unless otherwise stated results are reported on a wet weight basis This <br /> analytical report must be reproduced in its entirety <br /> IPage 49 of 80 <br />