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404 N Wiget Lane r <br /> Sequoia Walnut Creek CA 94598 <br /> 4 > (925)988-9600 <br /> Analytical FAX equ 9atis co 3 <br /> www sequoialabs corn <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron# 9-2033 Reported <br /> Dublin CA,94568 Project Manager Deanna L ]larding 12-Mar-01 07 45 <br /> Dissolved Metals by EPA 200 Series Methods - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Linut Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1CO1004-200 7 <br /> Blank(IC01004-BLKI) Prepared 01-Mar-01 Analyzed 08-Mar-01 <br /> Cadmium ND 0 010 mg/l <br /> Chromium ND 00100 " <br /> Lead ND 00200 <br /> Nickel ND 00100 " <br /> Zmc ND 0 0100 <br /> LCS(1C01004-BS1) Prepared 01-Mar-01 Analyzed 08-Mar-01 <br /> Cadmium 0 994 0 010 mg/1 1 00 994 80-120— <br /> Chromium 0 914 00100 100 914 80-t20 <br /> lead 0 974 00200 1 00 974 80-120 <br /> Nickel 0 989 00100 1 00 989 80-120 <br /> Zmc 1 00 00100 100 100 80-120 <br /> LCS Dup(1001004-BSDI) Prepared 01-Mar-01 Analyzed 08-Mar-01 <br /> Cadmium 0 973 0 Oto mgfl 100 973 80-120 2 14 20 <br /> Chromium 0 918 00100 1 00 918 80-120 0 437 20 <br /> Lead 0 914 00200 too 914 80-120 636 20 <br /> Nickel 0 969 00100 T 100 969 80-120 204 20 <br /> Zmc 102 00100 1 00 102 80-120 1 98 20 <br /> Matrix Spike(1C01004-MS1) Source W102418-01 Prepared 01-Mar-01 Analyzed 08-Mar-01 <br /> Cadmium 0 958 0 010 mg/1 106 ND 95 8 80-120 <br /> Chromium 0 895 00100 1 00 00447 850 80-120 <br /> Lead 0 877 00200 100 ND 877 80-120 <br /> Nickel 0 914 00100 100 Nil 914 80-120 <br /> Zmc 0 949 00100 1 00 00220 927 80-120 <br /> Matnx Spike Dup(iC01004-MSD]) Source W102418-01 Prepared 01-Mar-01 Analyzed 08-Mar-01 <br /> Cadmium 0 976 0 010 mg/l 160 ND 9-76 80-120 186 20 <br /> Chromium 0 903 00100 too 0 0447 858 80-120 0 890 20 <br /> Lead 0 867 00200 100 ND 867 80-120 1 15 20 <br /> Nickel 0 995 00100 1 fin rvn 01 a un-lin i IM �n <br /> Zmc 0 959 00100 1 00 00220 937 80-120 1 05 20 <br /> Sequoia Analytical -Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 11 of 25 <br />