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885 Jarvis Drive <br /> Sequoia Morgan H08)77 .9600 <br /> l,CA 95037 <br /> {408}776-9600 <br /> iW Analytical FAX <br /> ww.seg8)782-6308 <br /> wwsequoialabs.com <br /> URS Corporation[Arcolj Project:ARCO#5450,Stockton,CA MOE0229 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZN-0001 Reported: <br /> Sacramento CA,95833 Project Manager:Jeff Brooks 05/24/05 16:37 <br /> Purgeable Hydrocarbons by EPA 8015B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyle Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5E13004-EPA 5030B PIT]1 EPA 8015B-VOA <br /> Blank(5E13004-BLKI) Prepared&Analyzed:05/13/05 <br /> Gasoline Range Organics(C4-C 12) ND 50 ugll <br /> Surrogate:4-Bromofluorobenzene 40.5 40.0 101 80-120 <br /> Laboratory Control Sample(SE13004-BSI) Prepared&Analyzed:05/13/05 <br /> Gasoline Range Organics(C4-C12) 270 50 ug/l 275 98 55-130 <br /> Surrogate:4-Bromofluorobenzene 43.3 40.0 108 80-120 <br /> Matrix Spike(5E13004-MS1) Source:MOE0206-01 Prepared&Analyzed:05/13/05 <br /> Gasoline Range Organics(C4-C12) 336 50 ug/l 275 130 75 55-130 <br /> Surrogate,4-Bromofluorobenzene 43.1 40.0 108 80-120 <br /> Matrix Spike Dup(SE13004-MSD1) Source:MOE0206-01 Prepared&Analyzed:05/13/05 <br /> AdlWasoline Range Organics(C4-C12) 302 50 ug/I 275 130 63 55-130 11 35 <br /> WN -Bromofluorobenzene 42.4 40.0 106 80-120 <br /> Sequoia Analytical-Morgan Hill 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 6 of 9 <br />