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819 Sinker Avenue,Suite 8 <br /> (D (916)Sequoia Sacramento,CA 95834 <br /> 921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs corn <br /> I <br /> tter-Ryan-Rancho Cordova Project Unocal 0187,Stockton,CA <br /> 40Gold Camp Dr,Ste 170 Project Number N/A Reported <br /> ancho Cordova CA,95670 Project Manager David Herzog 03/04/02 16 09 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2020270-EPA 3050E <br /> Blank(2020270-BLK1) Prepared 02/22/02 Analyzed 02/25/02 <br /> Lead ND 2 5 mg/kg <br /> LCS(2020270-BSI) Prepared 02/22/02 Analyzed 02/25/02 <br /> Lead 484 2 5 mg/kg 500 968 80-120 <br /> Matrix Spike(2020270-MSI Source 5202277-01 Prepared 02/22/02 Analyzed 02/25/02 <br /> Lead 52 5 10 mg/kg 500 ND 978 80-120 <br /> Matrix Spike Dup(2020270-MSDI) Source 5202277-01 Prepared 02/22102_Analyzed 02/25/02 <br /> Lead 52 3 10 mg/kg Soo ND 974 80-120 0 382 20 <br /> • <br /> uoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 8 of 9 <br />