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885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> i wwwsequoialabs,com <br /> URS Corporation[Arcola Project: ARCO#0548,Stockton,Ca N4NH0053 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: NIP Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 08/06/04 16:20 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source a/aREC RPD <br /> Analyte Result limit Units Level Result °/aREC limits RPD limit Notes <br /> Batch 4HO5027-EPA 5030B PIT <br /> Laboratory Control Sample(4H05027-BS2) Prepared&Analyzed: 08/05/04 <br /> Benzene 5.41 0.50 ug/l 6.40 85 78-124 <br /> Ethylbenzene 7.75 0.50 6.96 111 84-117 <br /> Methyl tent-butyl ether 9.04 0.50 9.92 91 63-137 <br /> Toluene 31.1 0.50 29.7 105 78-129 <br /> Xylenes(total) 38.5 0.50 i; 33.7 114 83-125 <br /> Gasoline Range Organics(C4-C12) 382 50 440 87 70-124 <br /> Surrogate:l,2-Dichloroethane-d4 2.19 2.50 88 78-129 <br /> Laboratory Control Sample Dup(4H05027-BSD1) Prepared:08/05/04 Analyzed:08/06/04 <br /> tent-Amyl methyl ether 10.1 0.50 ug/l 10.0 101 56-140 0 12 <br /> ,,Benzene 10.1 0.50 10.0 101 7$-124 3 12 <br /> tert-Butyl alcohol 53.8 20 50.0 108 0.206 14 22 <br /> Di-isopropyl ether 10.1 0.50 10.0 101 76-130 0 9 <br /> 1,2-Dichloroethane 10.4 0.50 10.0 104 77-136 1 13 <br /> Ethanol 105 100 200 52 31-186 45 37 IC,RB <br /> Ethyl tert-butyl ether 10.4 0.50 10.0 104 61-141 2 9 <br /> Ethylbenzene 10.4 0.50 10.0 104 84-117 3 10 <br /> ' Methyl tert-butyl ether 10.9 0.50 10.0 109 63-137 9 13 <br /> Toluene 9.98 0.50 10.0 100 78-129 3 10 <br /> Xylenes(total) 31.3 0.50 30.0 104 83-125 2 11 <br /> I Surrogate:l,2-Dichloroethane-d4 2.18 2.50 87 78-129 <br /> Matrix Spike(4H05027-MSI) Source: MNH0071-02 Prepared: 08/05/04 Analyzed:08/06/04 <br /> Benzene 564 50 ug/l 640 ND 88 78-124 <br /> Elhylbenzene 824 50 696 ND 118 84-117 LM <br /> Methyl tert-butyl ether 3580 50 992 2700 89 63-137 <br /> Toluene 3200 50 2970 ND 108 78-129 <br /> Xylenes(total) 4020 50 3370 ND 119 83-125 <br /> Gasoline Range Organics(C4-C12) 40300 5000 44000 ND 92 70-124 <br /> Surrogate:l,2-Dichloroethane-d4 1.26 2.50 90 78-129 <br /> equoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of- <br /> custody <br /> fcustody document. Unless otherwise stated, results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> ' Page 13 of 16 <br />