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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma, <br /> A94965 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> Purgeable Hydrocarbons by EPA 8015B - 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 4GO7005-EPA 5030B JP/Tl <br /> Matrix Spike Dup(4G07005-MSDI) Source P406495-07 Prepared&Analyzed 07/07/04 <br /> Gasoline Range Organics(C4-C 12) 515 50 ugA 550 ND 94 62 134 8 41 <br /> Surrogate 4-Bromofluorobenzene 377 400 94 70-130 <br /> Batch 4GO8004-EPA 5030B [PIT] <br /> Blank(4G08004-BLK1) Prepared&Analyzed 07/08/04 <br /> Gasoline Range Organics(C4 C 12) ND 50 ug/I <br /> Surrogate 4-Bromofluorobenzene 368 400 92 70-130 <br /> Laboratory Control Sample(4G08004-BS2) Prepared&Analyzed 07/08/04 <br /> Gasolme Range Organics(C4-Cl2) 239 50 ug/l 250 96 62-134 <br /> Surrogate 4-Bromofluorobenzene 421 400 105 70-130 <br /> Atrix Spike(4G08004-MS1) Source P406495-19 Prepared&Analyzed 07/08/04 <br /> oline Range Organics(C4-C 12) 588 50 ugll 550 ND 107 62-134 <br /> Surrogate 4-Bromofluorobenzene 468 400 117 70-130 <br /> Matrix Spike(4G08004-MS2) Source P406495-18 Prepared 07/08/04 Analyzed 07/10/04 <br /> Gasoline Range Organics(C4-C 12) 532 50 ug/l 550 ND 97 62 134 <br /> Surrogate 4-Bromofluorobenzene 456 400 114 70-130 <br /> Matrix Spike Dup(4G08004-MSDI) Source P406495-19 Prepared&Analyzed 07/08/04 <br /> Gasoline Range Organics(C4-C12) 604 50 ugA 550 ND 110 62-134 3 41 <br /> Surrogate 4-Bromofluorobenzene 470 400 118 70-130 <br /> Matrix Spike Dup(4G08004-MSD2) Source P406495-18 Prepared 07/08/04 Analyzed 07/10/04 <br /> Gasoline Range Organics(C4-C12) 471 50 ug/I 550 ND 86 62-134 12 41 <br /> Surrogate 4-Bromofluorobenzene 448 400 112 70-130 <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 26 of 41 <br />