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885 Jarvis Dr <br /> Sequoia Mogan Hill,CA 95037 <br /> (408)776-9600 <br /> a— ) <br /> ' Analytical FAX(408)782-6308 <br /> www sequoialabs can <br /> URS Corporation[11 Project ARCO#2093,Tracy,CA MLL0596 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#2093,Tracy,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 12/20/02 1142 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD �I <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2120299-EPA 3050B <br /> Blank(2120299-BLKI) Prepared 12/18/02 Analyzed 12/20/02 <br /> Lead ND 25 mglkg <br /> Laboratory Control Sample(2120299-BSI) Prepared 12/18/02 Analyzed 12/20/02 <br /> Lead 470 25 mg/kg 500 94 80-120 <br /> Matrix Spike(2120299-MSI) Source 5212380-01 Prepared 12/18/02 Analyzed 12/20/02 <br /> Lead 210 10 mg/kg 500 150 120 80-120 QM-07 <br /> Matrix Spike Dup(2120299-MSDI) Source 5212380-01 Prepared 12/18/02 Analyzed 12/20/02 <br /> Lead 180 10 mg/kg 500 150 60 80-120 15 20 QM-07 <br /> i <br /> Sequoia 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 an a wet weight basis <br /> This analytical report must be reproduced rn its entirety <br /> 5 of 6 <br />