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_ $85 Jarvis Drive <br /> 'Sequoia Morgan 5J CA 95037 <br /> ` r (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www,sequoialabs.com <br /> URS Corporation rArcol) Project:ARCO 42130,Stockton,CA M0I0544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNernon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike source "/6REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5I22020-EPA 5030B PIT 1 EPA 8260B <br /> Matrix Spike(5I22020-MSI) Source:M010493-02 Prepared&Analyzed:09/22/05 <br /> tent-Amyl methyl ether 69.0 2.5 ug(I :75.2 ND 92 80-115 <br /> Benzene 24.4 2.5 .25.8 ND 95 65-115 <br /> tert-Butyl alcohol <br /> 633 100 .,715 ND 89 75-120 <br /> Di-isopropyl ether 68.3 2.5 75.7 ND 90 75-125 <br /> 1,2-Dichloroethane 68.2 2.5 :73.6 ND 93 85-130 <br /> Ethanol 646 500 707 ND 91 70-135 <br /> Ethyl Cert-butyl ether 67.5 2.5 75.1 ND 90 75-130 <br /> Ethylbenzene 30.1 2.5 37.7 ND 80 75-135 <br /> Methyl tert-butyl ether 48.3 2.5 35.1 13 101 65-125 <br /> Toluene 172 2,5 186 ND 92 85-120 <br /> Xylenes(total)` 176 2.5 207 ND 85 65-125 <br /> r�Gasoline Range Organics(C4-C]2) 2440 250 2200 ND 111 70-124 <br /> urr19ate:1,2-bichloroelhane-d4 1.91 1.50 76 60-135 <br /> ,L <br /> Matrix Spike;Dup(5I22020-MSD!) Source:M0I0493-02 Prepared&Analyzed:09/22/05 <br /> tert-Amyl methyl ether 67.8 2.5 ug/l 75.2 ND 90 80-115 2 15 <br /> Benzene 23.2 2.5 25.8 ND .90 65-115 5 20 <br /> tert-Butyl alcohol 589 100 '715 ND 82 75-120 7 25 <br /> Di-isopropyl ether 66.5 2.5 75.7 ND 88 75-125 3 15 <br /> r <br /> 1,2-Dichloroethane 65.0 2.5 73.6 ND 88 85-130 5 20 <br /> Ethanol 1 611 500 707 ND 86 70-135 6 35 <br /> Ethyl tert-butyl!ether 65.8 2.5 75.1 ND 88 75-130 3 25 <br /> Ethylbenzene 29.3 2.5 37.7 ND 78 75-135 3 15 <br /> Methyl tert-butyl ether 48.8 2.5 35.1 13 102 65-125 1 20 <br /> Toluene 165 2.5 ,186 ND 89 85-120 4 20 <br /> Xylenes(total)' 168 2.5 207 ND 81 85-125 5 20 LN <br /> '4 <br /> Gasoline Range Organics(C4-C12) 2330 250 :2200 ND 106 70-124 5 20 <br /> Surrogate:1,2-Dichloroethane-d4 1.84 1.50 74 60-135 <br /> r <br /> Sequoia.Analytical-Morgarl Hill 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 hasis. <br /> This analytical report must be reproduced in its entirety. <br /> Page.]9 of 25 <br /> ii <br />