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( . ' Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> IIW Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> • <br /> URS Carp-Sacramento4678 <br /> Project BP Heritage Site 11191,Stockton,Ca <br /> 2870 Gateway Oaks Drive Suite 300 Project Number-WR36368 P4 <br /> Sacramento CA,95833 Reported <br /> Project Manager Vernon P Elarth 05/27/04 15 02 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyse Result Limn Units Leve[ Result %REC Limits RPD LimitNotes <br /> Batch 4050263-EPA 5030B waters <br /> Laboratory Control Sample(4050263-BSJ) Prepared 05/11/04 Analyzed 05/12/04 <br /> Tert-amyl methyl ether 540 10 ug/1 5 00 <br /> 108 78-117 <br /> Benzene 528 050 1. 5 00 106 81-118 <br /> Tert butyl alcohol 104 20 " 100 <br /> E04 60-147 <br /> Di-isopropyl ether 526 10 5 00 105 70-125 <br /> Ethanol 970 I00 100 <br /> Ethylbenzene " 97 55-200 <br /> 4 99 0 50 500 100 89-122 <br /> Ethyl tert-bury[ether 539 10 500 <br /> 108 71-I20 <br /> Methyl tert-butyl ether 5 34 050 500 <br /> [07 7D-122 <br /> Toluene 5 15 0 50 500 <br /> 103 84-119 <br /> Xylenes(total) 154 0 50 150 <br /> 103 86-132 <br /> Surrogate Dibromofluoromethane 496 500 <br /> 99 84-121 <br /> Surrogate 12-Dichloroethane-d4 5 46 500 <br /> 109 74-135 <br /> ogate Toluene-d8 5 19 500 104 84-119 <br /> atrix Spike(4050263-MSI) Source P404694-11 Prepared 05/11/04 Analyzed 05/12/04 <br /> Tert-amyl methyl ether 538 1 0 ugll Soo ND 108 78-117 <br /> Benzene 537 0 50 " 500 ND 107 81-118 <br /> Tert-butyl alcohol 108 20 100 ND 108 60-147 <br /> Di-isopropyl ether 534 1 0 Soo ND 107 70-125 <br /> Ethanol 993 100 100 ND 99 55-200 <br /> Ethylbenzene 5 04 0 50 Soo ND 101 89-122 <br /> Ethyl tert-butyl ether 567 1 0 500 ND 113 71-120 <br /> Methyl tert-butyl ether 569 050 Soo 026 109 70-122 <br /> Toluene 5 17 050 500 ND 103 84-119 <br /> Xylenes(total) 158 050 15 0 ND 105 86-132 <br /> Surrogate Dibromofluoromelhane 538 500 108 84-122 <br /> Surrogate 11-Dichloroethane-d4 5 79 500 116 74-135 <br /> Surrogate Toluene-d8 533 11 500 107 84-119 <br /> Sequoia Analytical -Petaluma The results in this reporl apply 10 the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 12 of 14 <br />