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1455 McDowell l <br /> Sequoia Petaluma, <br /> North Ste <br /> aluu ma,CA 949544 <br /> a__ � 4 <br /> (707)792-13 <br /> Analytical 65 <br /> FAX(707)792-0342 <br /> www,sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <br /> Purgeable Hydrocarbons by EPA 8015B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %RI;C RPD <br /> Analyse Result limit Units Level Result °/6REC Limits RPD Limit Notes <br /> Batch 4120548-EPA 5030B,waters 1 EPA 8015B-VOA <br /> Blank(4120548-BLK1) Prepared&Analyzed 12/29/04 <br /> Gasoline Range Organics(C4-C12) ND 54 URA <br /> Surrogate 4-Bromofluorobenzene 159 300 86 80-110 <br /> Laboratory Control Sample(4120548-BSI) Prepared&Analyzed 12/29/04 <br /> Gasoline Range Organics(C4-C12) 2860 50 ugfl 2750 104 67-101 HL <br /> Surrogate 4-Bromofluorobenzene 304 300 101 80-110 <br /> Matrix Spike(4120548-MSI) Source P412368-03 Prepared&Analyzed 12/29/04 <br /> Gasoline Range Organics(C4-C12) 2840 50 ugli 2750 57 101 67-101 <br /> Surrogate 4-Bromofluorobenzene 305 .300 101 80-110 <br /> Matrix Spike Dup(4120548-MSDI) Source P412368-03 Prepared&Analyzed 12/29/04 <br /> Gasoline Range Organics(C4-C12) 2750 50 ugll 2750 57 98 67-101 3 20 <br /> .Surrogate 4-Bromofluorobenzene 305 300 101 80110 <br /> Batch 4120569-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4120569-BLK1) Prepared&Analyzed 12/30/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ugll <br /> Surrogate 4-Bromofluorobenzene 173 300 91 80-110 <br /> Laboratory Control Sample(4120569-BSI) Prepared&Analyzed 12/30/04 <br /> Gasoline Range Organics(C4-C12) 2880 50 ugll 2750 105 67-101 HL <br /> Surrogate 4-Bromofluorobenzene 305 300 101 80-110 <br /> Matrix Spike(4120569-MSI) Source P412423-06 Prepared&Analyzed 12/30/04 <br /> Gasoline Range Organics(C4-C 12) 2950 50 ugll 2750 68 105 67-101 HL <br /> Surrogate 4-Bromofluorobenzene 304 11300 101 80-110 <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 /> 10 This analytical report must be reproduced in its entirety <br /> Page 17 of 33 <br />