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(� 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 4D (707)792-1865 <br /> iv— Analytical FAXequoi792-0342 <br /> www sequo[alabs corn <br /> 0 <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P310692 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/14/03 15 55 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3110173-EPA 5030 waters <br /> Matrix Spike(3110173-MS1) Source P310692-14 Prepared&Analyzed 11/10/03 <br /> Tert-amyl methyl ether 246 5 0 ug/l 25 0 ND 98 70-116 <br /> Benzene 38 3 2 5 25 0 la 97 81-118 <br /> Tert-butyl alcohol 385 100 500 ND 77 62-142 <br /> Di-isopropyl ether 22 5 5 0 25 0 ND 90 71-121 <br /> Ethanol 499 500 500 ND 100 65-135 <br /> Ethylbenzene 48 5 2 5 25 0 23 102 89-122 <br /> Ethyl tert-butyl ether 22 9 5 0 25 0 ND 92 71-110 <br /> Methyl tent-butyl ether 244 2 5 25 0 1 2 93 77-123 <br /> Toluene 26 1 2 5 25 0 1 6 98 84-119 <br /> Xylenes(total) 744 2 5 75 0 ND 99 86-132 <br /> #rr0,,9,",t, <br /> le Dibromof]uoromethane 4 74 450 105 84-111 <br /> I 1-Dichloroethane-d4 4 39 450 98 74-135 <br /> rogale Toluene-d8 520 4.50 116 84-I19 <br /> Matrix Spike Du (3110173-MSD1) Source P310692-14 Prepared&Analyzed 11/10/03 <br /> Tert-amyl methyl ether 24 8 5 0 u9/1 25 0 ND 99 70-116 0 8 20 <br /> Benzene 389 2 5 25 0 14 100 81-118 2 20 <br /> Tert-butyl alcohol 319 100 500 ND 64 62-142 19 20 <br /> Di-isopropyl ether 229 5 0 25 0 ND 92 71-121 2 20 <br /> Ethanol 344 500 500 ND 69 65-135 37 20 QR-01 <br /> Ethylbenzene 494 2 5 25 0 23 106 89-122 2 20 <br /> Ethyl tert-butyl ether 23 6 5 0 25 0 ND 94 71-110 3 20 <br /> Methyl tert-butyl ether 249 2 5 25 0 1 2 95 77-123 2 20 <br /> Toluene 266 2 5 25 0 1 6 100 84-119 2 20 <br /> Xylenes(total) 766 2 5 75 0 ND 102 86-132 3 20 <br /> Surrogate Dibromofluoromethane 4 85 450 108 84-122 <br /> Surrogate 1 1-Dichloroethane-d4 4 34 450 96 74-135 <br /> Surrogate Toluene-d8 5 15 450 114 84-119 <br /> Sequoia Analytical -Petaluma The results in this report apply to the vamples analyzed in accordance with the chain <br /> of custody document Unless otherwise slated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 15 of 22 <br />