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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> t707l 792-1865 <br /> FAX(707)792-0342 <br /> Analytical <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %RHC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4120453-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4120453-BLK1) Prepared 12/21/04 Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 266 300 89 80-110 <br /> Laboratory Control Sample(4120453-BSI) Prepared 12/21/04 Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C12) 2270 50 ug/l 2750 83 67-101 <br /> Surrogate 4-Bromofluorobenzene 309 300 103 80-110 <br /> Matrix Spike(4120453-MS1) Source P412145-12 Prepared 12/21/04 Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C 12) 2510 50 ug/l 2750 260 82 67-101 <br /> Surrogate 4-Bromofluorobenzene 314 300 105 80-110 <br /> Matrix Spike Dup(4120453-MSD1) Source P412145-12 Prepared 12/21/04 Analyzed 12/22/04 <br /> ,okasoline Range Organics(C4-C12) 2450 50 ug/l 2750 260 80 67-101 2 20 <br /> urrogate 4-Bromofluorobenzene 312 300 104 80-110 <br /> Batch 4120469-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4120469-BLK1) Prepared&Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/I <br /> Surrogate 4-Bromofluorobenzene 265 300 88 80-110 <br /> Laboratory Control Sample(4120469-BSI) Prepared&Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C12) 2280 50 ugll 2750 83 67 101 <br /> Surrogate 4-Bromofluorobenzene 307 300 102 80-110 <br /> Matrix Spike(4120469-MS1) Source P412205-06 Prepared&Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C12) 48300 1000 ug/1 55000 3000 82 67-101 <br /> Surrogate 4-Bromofluorobenzene 310 300 103 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 /> This analytical report must be reproduced in its entirely <br /> Page 13 of 21 <br />