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I <br /> c (� 1455 McDowell Blvd,North Ste D <br /> ( \ <br /> Sequoia Petaluma CA 44954 <br /> (707)792-1855 <br /> Analytical www <br /> seq 7) labs corn www sequwalabs coin <br /> oft—o <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P406360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 07 39 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %nREC Limits RPD Limit Notes <br /> Batch 4060527-EPA 5030B,waters <br /> Blank(4060527-BLKI) Prepared&Analyzed 06/24/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ugfl <br /> Surrogate 4-Bromofluorobenzene 300 300 100 65-135 <br /> Laboratory Control Sample(4060527-BS1) Prepared&Analyzed 06/24/04 <br /> Gasoline Range Organics(C4-C 12) 2360 50 ug/I 2750 86 — 65-135 <br /> Surrogate 4-Bromofluorobenzene 310 11U'3 00 107 65-135 <br /> Matrix Spike(4060527-MSI) Source P406360-04 � Prepared&Analyzed 06/24/04 } Q 6J <br /> Gasoline Range Organics(C4-C12) 114000 2500 ug/1 138000 2600 81 � 65-135 <br /> Surrogate 4-Bromofluorobenzene 227 300 8 65-135 S J f r A-01 <br /> Matrix Spike Dup(4060527-MSD1) Source P406360-04 Prepared&Analyzed 06/24/04 <br /> olinc Range Organics(C4 C12) 111000 2500 ugA 138000 2600 79 65-135 3 20 <br /> Surrogate 4-Brornofluorobenzene 300 11300 100 _ 65-135 <br /> .Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody doctunent Unless otherwise stated results are reported on a wet weight basis <br /> Thts analytical report must be reproduced in its entirety <br /> Page 15 of 21 <br />