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i S equ oia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1842 <br /> FAX(707)792-0342 <br /> www.sequoi2labs.com <br /> U <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GO13ZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 04/13/05 09:46 <br /> Purgeable Hydrocarbons by EPA 8015B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source °/6REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5040041-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(5040041-BLKI) Prepared&Analyzed:04/05/05 <br /> Gasoline Range Organics(C4-Cl2) ND 50 ug/1 <br /> Surrogate:4-Brbmofluorobenzene 189 300 96 80-110 <br /> Laboratory Control Sample,(5040041-BSI) Prepared&Analyzed:04/05/05 <br /> Gasoline Range Organics(C4-C 12) 2680 50 ugll 2750 97 60.9-120 <br /> Surrogate:4-Bromofluorobenzene 295 " 300 98 80-110 <br /> Matrix Spike(5040041-MSI) Source:P504010-01 Prepared&Analyzed:04/05/05 <br /> Gasoline Range Organics(C4-C 12) 2630 50 ug/1 2750 ND 96 60.9-120 <br /> Surrogate:4-Bromofluorobenzene 288 300 96 80-110 <br /> Matrix Spike Dup(5040041=MSA1) Source:P504010-01 Prepared&Analyzed:04/05/05 <br /> Gasoline Range Organics(C4-C 12) 2560 50 ugll 2750 ND 93 60.9-120 3 20 <br /> 'urrogate:4-Bromofluorobenzene 284 300 95 80-110 <br /> Batch 5040054-EPA 50308,waters 1 EPA 8015E-VOA <br /> Blank(5040054-BLK1) Prepared&Analyzed:04/06/05 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/l . <br /> Surrogate:4-Bromofluorobenzene 183 " 300 94 80-110 <br /> Laboratory Control Sample(5040054-BS1) Prepared&Analyzed:04/06/05 <br /> Gasoline Range Organics(C4-C 12) 2440 50 ug/l 2750 89 60.9-120 <br /> Surrogate:4-Brbmofluorobenzene 305 " 300 102 80-110 <br /> Matrix Spike(5040054-MSI) Source:P504013-03 Prepared&Analyzed:04/06/05 <br /> Gasoline Range Organics(C4-C 12) 2370 50 uo 2750 ND w 86 60.9-120 <br /> Surrogate:4-Bromofluorobenzene 299 300 100 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 entirety. <br /> Page 19 of 29 <br />