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8Jams Drive <br /> D <br /> Sequoia MorganHill CA 95037 <br /> (408)776-9600 <br /> iW Analytical FAX(408)782 6308 <br /> www seyuotalabs coin <br /> URS Corporation rArco I Project ARCO 45469, Stockton,CA M010324 <br /> 2870 Gateway Oaks Dr Ste 300 Project Number GOBZP-0002 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/28/05 09 43 <br /> Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5I20058-General Preparation /EPA 410 4 <br /> Blank(5120058-BLK1) Prepared&Analyzed 09/20/05 <br /> Chemical Oxygen Demand ND 30000 ugll <br /> Laboratory Control Sample(5I20058-BSI) Prepared&Analyzed 09/20/05 <br /> Chemical Oxygen Demand 112000 33000 ug/l 111000 101 75-120 <br /> Matrix Spike(5120058-MS1) Source M010324-10 Prepared&Analyzed 09/20/05 <br /> Chemical Oxygen Demand 144000 33000 ug/l 111000 31000 102 75-120 <br /> Matrix Spike Dup(5120058-MSD1) Source M010324-10 Prepared&Analyzed 09/20/05 <br /> Chemical Oxygen Demand 150000 33000 ug,9 111000 31000 107 75-120 4 15 <br /> orola 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 on a wet weight basis <br /> This analytical report must he reproduced in its entirety <br /> Page 16 of 18 <br />