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/�;�\ 1455 McDowell Blvd,North Ste <br /> /- \ <br /> Sequoia Petaluma CA 949544 <br /> 4 <br /> .. <br /> 792-1965 <br /> Analytical <br /> FAX(707)792 0342 <br /> www sequotafabs coin <br /> URS Corp-Sacramento Project BP Hentage Site 11191,Stockton,Ca P501283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/27/05 08 37 <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 lama Notes <br /> Batch 5010267-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5010267-MS1) Source P501283-01 Prepared&Analyzed 01/25/05 <br /> Tert-amyl methyl ether 3000 500 ug/1 2500 ND 120 78-117 LM <br /> Benzene 2510 250 2500 ND 100 81-118 <br /> Tert butyl alcohol 46200 10000 50000 ND 92 60-147 <br /> Dt-isopropyl ether 2710 500 2500 ND 108 70-125 <br /> Ethanol 46700 50000 50000 ND 93 55-200 <br /> Ethylbenzene 2380 250 2500 ND 95 89-122 <br /> Ethyl tert-butyl ether 2580 500 2500 ND 103 71-120 <br /> Methyl tert-butyl ether 13500 250 2500 9400 164 70-122 LM <br /> Toluene 2500 250 2500 ND 100 84-119 <br /> Xylenes(total) 7460 250 7500 ND 99 86-132 <br /> Surrogate Dibromofluoromethane 509 5 00 102 84-122 <br /> arrogate 1 2-Dichloroethane-d4 558 5 00 112 74-135 <br /> arrogate Toluene-d8 504 500 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 79 5 00 96 86-119 <br /> Matrix Spike Dup(5010267-MSDI) Source P501283-01 Prepared&Analyzed 01/25/05 <br /> Ten-amyl methyl ether 3000 500 ugll 2500 ND 120 78-117 0 20 LM <br /> Benzene 2550 250 2500 ND 102 81-118 2 20 <br /> Tert-butyl alcohol 51200 10000 50000 ND 102 60-147 10 20 <br /> Di-isopropyl ether 2730 500 2500 ND 109 70-125 0 7 20 <br /> Ethanol 47800 50000 50000 ND 96 55-200 2 20 <br /> Ethylbenzene 2480 250 2500 ND 99 89-122 4 20 <br /> Ethyl tent-butyl ether 2640 500 2500 ND 106 71-120 2 20 <br /> Methyl tert-butyl ether 13800 250 2500 9400 176 70-122 2 20 LM <br /> Toluene 2510 250 2500 ND 100 84-119 04 20 <br /> Xylenes(total) 7760 250 7500 ND 103 86-132 4 20 <br /> Surrogate Dibromofluoromeihane 494 500 99 84-112 <br /> Surrogate 12 Drchloroethane-d4 556 500 Ill 74-135 <br /> Surrogate Toluene-d8 487 500 97 84-119 <br /> Surrogate 4 Bromofluorobenzene 479 500 96 86-119 <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 11 of 12 <br />