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1455 McDowell Blvd,North Ste D <br /> ID Sequoia Petaluffuk CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs cvm <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P309344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 45 <br /> Total Petroleum Hydrocarbons as Gasoline by EPA 8015B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Ltnuts RPD Lmut Notes <br /> Batch 3090551-EPA 5030,waters <br /> Blank(3090551-BLKI) Prepared&Analyzed 09/24/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 263 300 88 65-135 <br /> Laboratory Control Sample(3090551-BS1) Prepared&Analyzed 09/24/03 <br /> Gasoline Range Organics 2320 50 ug/l 2750 84 65-135 <br /> Surrogate 4-Bromofluorobenzene 289 300 96 65-135 <br /> Matrix Spike(3090551-MSI) Source P309293-01 Prepared&Analyzed 09/24/03 <br /> Gasoline Range Organics 2210 50 ug/1 2750 ND 80 65-135 <br /> Surrogate 4-Bromofluorobenzene 285 300 95 65-135 <br /> Matrix Spike Dup(3090551-MSDI) Source P309293-01 Prepared&Analyzed 09/24/03 <br /> Gasoline Range Organics 2320 50 ugil 2750 ND 84 65-135 5 20 <br /> urragate 4-Bromofluorobenzene 288 300 96 65-135 <br /> Batch 3090579-EPA 5030,waters <br /> Blank(3090579-BLKI) Prepared&Analyzed 09/25/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 281 300 94 65-135 <br /> Laboratory Control Sample(3090579-BS1) Prepared&Analyzed 09/25/03 _ <br /> Gasoline Range Organics 2500 50 ug/l 2750 91 65-135 <br /> Surrogate 4-Bromofluorobenzene 295 300 98 65-135 <br /> Matrix Spike(3090579-MS1) Source P309344-07 Prepared&Analyzed 09/25/03 <br /> Gasoline Range Organics 2300 50 ug/l 2750 16 83 65-135 <br /> Surrogate 4-Bromofluorobenzene 289 " 300 96 65-135 <br /> Sequoia Analytical - Petaluma 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 be reproduced in its entirety <br /> Page 10 of 15 <br />