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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX 921 <br /> Analytical www sequoialabs Con <br /> ' <br /> SECOR International-Rancho Cordova Project ARCO 595, Stockton,CA <br /> 3017 Kilgore Road, Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/31/01 17 12 <br /> Total Metals by EPA 6000/700_0 Series Methods - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD ' <br /> Analyte Result Limit Units Level Result %R$C Limits RPD Limit Notes <br /> Batch 1070251 -EPA 3010A <br /> Blank(1070251-BLKI) Prepared 07/26/01 Analyzed 07/27/01 _ <br /> Lead ND 0 050 mgll <br /> LCS(1070251-BSI) Prepared 07/26/01 Analyzed 07/27/01 i <br /> Lead 0 536 0 054 mg/i 0 500 107 80-120 <br /> Matrix Spike(1070251-MS1) Source 5107265-01 Prepared 07/26/01 Analyzed 07/27/01 <br /> Lead 0 520 0 050 mg(l 0 500 ND 104 80-120 <br /> _Matrix Spike Dup(1070251-MSD1) Source 5107265-01 Prepared 07/26/01 Analyzed 07/27/01 <br /> Lead 0 520 0 050 mg/1 0 500 ND 104 80-120 000 20 , <br /> Batch 1070252-EPA 3050E <br /> Blank(1070252-BLKI) Prepared 07/26/01 Analyzed 07/27/01 <br /> Lead ND 25 mg/kg <br /> LCS_ (1070252-BSI) Prepared 07/26/01 Analyzed 07/27/01 <br /> Lead 530 25 mg/kg 500 106 80-120 <br /> Matrix Spike(1070252-MSI) -- - --=Source SI07210=I3- —Prepared 07/26/01 Analyzed 07/27/01 <br /> Load 526 10 mg/kg 500 ND 105 80-120 <br /> Matrix Spike Dup(1070252-MSD1) Source 5107210-13 Prepared 07/26/01 Analyzed 07/27/01 ' <br /> Lead 538 10 mg/kg 500 ND 108 80-120 226 20 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety ' <br /> Page 6 of 8 , <br />