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1455 McDowell Blvd,North Ste D <br /> 4DSequoia Petaluma.CA 94954 <br /> (707)792-1965 <br /> 42 <br /> IW Analytical FAX{707ialabs om <br /> www sequmalabs com <br /> Is <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-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 %REC Lunits RPD limit Notes <br /> Batch 4090626-EPA 5030B,waters/EPA 9015B-VOA <br /> Blank(4090626-BLKI) Prepared&Analyzed 09/24/04 <br /> Gasoline Range Organics(C4-Cl2) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 287 300 96 77-101 <br /> Laboratory Control Sample(4090626-BSI) Prepared&Analyzed 09/24/04 <br /> Gasoline flange Organics(C4-C12) 2210 50 UO 2750 80 67-101 <br /> Surrogate 4 Bromofluorobenzene 306 300 102 77-101 LH <br /> Matrix S ike(4090626-MSI) Source P409397-05 Prepared&Analyzed 09/24/04 <br /> Gasoline Range Organics(C4-C 12) 2180 50 ugll 2750 ND 79 67-101 <br /> Surrogate 4-Bromofluoroberizene 192 300 97 77-101 <br /> Matnx Spike Dup(4090626-MSD1) Source P409397-05 Prepared&Analyzed 09/24/04 <br /> .ddhGasohn Range Organics(C4-C12) 2160 50 ug/l 2750 ND 79 67-101 09 20 <br /> arrogate 4-Bromofluorobenzene 293 300 98 77-101 <br /> Batch 4090627-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4090627-BLKI) Prepared&Analyzed 09/24/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/I <br /> Surrogate 4-Bromofluorobenzene 258 " 300 86 77-101 <br /> Laboratory Control Sample(4090627-BSI) Prepared&Analyzed 09/24/04 <br /> Gasoline Range Organics(C4-C]2) 2200 50 ug/l 2750 80 67-101 <br /> Surrogate 4-Bromofluorobenzene 279 300 93 77-101 <br /> Matrix Spike(4090627-MS1) Source P409417-01 Prepared&Analyzed 09/24/04 <br /> Gasoline Range Organics(C4-C12) 2120 50 ug/l 2750 ND 77 67-101 <br /> Surrogate 4-Bromofluorobenzene 272 300 91 77-101 <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 />