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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1845 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number]ntrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/04 14 40 <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 °/oREC lAmrts RPD Limit Notes <br /> Batch 4110609-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4110609-BLKI) Prepared&Analyzed 11/23/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ugA <br /> Surrogate 4-Bromofluorobenzene 191 300 97 80-110 <br /> Laboratory Control Sample(4110609-BSI) Prepared&Analyzed 11/23/04 <br /> Gasoline Range Organics(C4-C12) 2630 50 ugA 2750 96 67-101 <br /> Surrogate 4-Bromofluorobenzene 311 300 104 80-110 <br /> Matrix Spike(4110609-MSI) Source P411239-05 Prepared&Analyzed 11/23/04 <br /> Gasoline Range Organics(C4-C12) 2700 50 ug/l 2750 ND 98 67-101 <br /> Surrogate 4-Bromofluorobenzene 313 300 104 80-110 <br /> Matnx Spike Dup(4110609-MSD1) Source P411239-05 Prepared&Analyzed 11/23/04 <br /> Gasoline Range Organics(C4-C12) 2750 50 ugA 2750 ND 100 67-101 2 20 <br /> Surrogate 4-Bromofluorobenzene 318 300 106 80-110 <br /> Watch 4110614-EPA 503013,waters/EPA 8015B-VOA <br /> Blank(4110614-BLKI) Prepared&Analyzed 11/23/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ugA <br /> Surrogate 4-Bromofluorobenzene 242 300 81 80-110 <br /> Laboratory Control Sample(4110614-BSI) Prepared&Analyzed 11/23/04 <br /> Gasoline Range Organics(C4-C12) 2510 50 ugA 2750 91 67-101 <br /> Surrogate 4-Bromofluorobenzene 268 300 89 80-110 <br /> Matrix Spike(4110614-MSI) Source P411280-12 Prepared&Analyzed 11/23/04 <br /> Gasoline Range Organics(C4-C 12) 364000 5000 UgA 275000 83000 102 67-101 LM <br /> Surrogate 4-Bromofluorobenzene 175 11300 92 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 /> w <br /> Page 13 of 19 <br />