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3455 McDowell Blvd,NonL Ste D <br /> Se uola Petaluma.CA 94954 <br /> � (707)792-3865 <br /> a— ) FAX <br /> (707)792-0342 <br /> Analytical www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Purgeable Hydrocarbons by EPA 8015B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result limit Units Level Result °/9REC Limits RPD limit Notes <br /> Batch 4090627-EPA 5030B,waters 1 EPA 8015B-VOA <br /> Matrix Spike Dup(4090627-MSDI) Source P409417-01 Prepared&Analyzed 09/24/04 <br /> Gasoline Range Organics(C4-C12) 2230 50 ug/1 2750 ND 81 67-101 5 20 <br /> Surrogate 4-Bromofluorobenzene 272 300 91 77-101 <br /> Batch 4090730-EPA 50308,waters/EPA 8015B-VOA <br /> Blank(4090730-BLKI) Prepared&Analyzed 09/29/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ugf I <br /> Surrogate 4-Bromofluorobenzene 277 " 300 91 804-110 <br /> Laboratory Control Sample(4090730-BSI) Prepared&Analyzed 09/29/04 <br /> Gasoline Range Organics(C4-C12) 2110 50 ug/1 2750 77 67-101 <br /> Surrogate 4-Bromofluorobenzene 294 300 98 804-110 <br /> atnx Spike(4090730-MSl) Source P409434-03 Prepared&Analyzed 09/29/04 <br /> Gasolme Range Organics(C4-C12) 2120 50 ugll 2750 ND 77 67-101 <br /> Surrogate 4-Bromofluorobenzene 306 11300 102 804-110 <br /> Matnx Spike Dup(4090730-MSDI) Source P409434-03 Prepared&Analyzed 09/29/04 <br /> Gasoline Range Organics(C4-C12) 2110 50 ugll 2750 ND 77 67-101 05 20 <br /> Surrogate 4 Bromofluorobenzene 304 300 101 804-110 <br /> Sequoia Analytical ical-Petaluma The results in this report apply to the samples analyzed to 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 20 of 29 <br />