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lvd North Ste D <br /> Sequoia 145�McDowPetalum CA 94954 <br /> D—r <br /> 7 (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs coin <br /> • <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy, CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA, 9833 Project Manager-Jay Johnson 05/19/05 11 20 <br /> Purbeable Hydrocarbons by EPA 8015B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Bach Prepared Analyzed Method Note <br /> 6100 ATNF(P505120-01)Air Sampled 05/16/05 10 45 Received 05/16/05 I2 53 <br /> Gasoline Range Organics(C4-C12) 29000 500 mg/m'Air 10 5050093 05/17/05 05/17/05 EPA S015B-VOA <br /> 1223 <br /> Surrogate 4-Bromofluorobenzene 93 % 65-135 " <br /> Gasoline Range Organics(C4-C12) 8200 140 ppmv 10 ^ <br /> Surrogate 4-Bromofluorobenzene 93 % 65-135 " <br /> 6100 A SYS INF(P505120-02)Air Sampled 05/16/05 10 40 Received 05/16/05 12 53 <br /> Gasoline Range Organics(C4-C12) 22000 500 mg/m'Air 10 5050093 05/17/05 05/17/05 EPA 8015B-VOA <br /> 12 51 <br /> Surrogate 4-Bromofluorobenzene 93 % 65-135 " <br /> Gasoline Range Organics(C4-C12) 6300 140 ppmv 10 " <br /> Surrogate 4-Bromof7uorobenzene 93 % 65-135 <br /> 0 A SYS EFF(P505120-03)Air Sampled 05/16/051035 Received 051161051253 <br /> oline Range Organics(C4-C12) ND 50 mg/m'Air 1 5050093 05/17/05 05/17/05 EPA 8015E-VOA <br /> 1125 <br /> Surrogate 4-Bromof7uorobenzene 88 % 65-135 " <br /> Gasoline Range Organics(C4-C12) ND I4 ppmv <br /> Surrogate 4-Bromofluorobenzene 88 % 65-135 " <br /> �quoia 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 3 of 11 <br />