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85 <br /> Drive <br /> (D- Sequoia MorganBHillaCA95037 <br /> E (408)776 9600 <br /> Analytical FAX(408)782-6108 <br /> www sequoialabs com <br /> URS Corporation rArcoII Project ARCO#5469, Stockton,CA MOI0324 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOBZP-0002 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/28/05 09 43 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REG Limits RPD Lima Notes <br /> Batch 5115058- EPA 5030B P/T/EPA 8260B <br /> Matrix Spike(5115058-MS1) Source M0I0324-04 Prepared&Analyzed 09/15/05 <br /> tert-Amyl methyl ether 729 25 ug/I 752 ND 97 80-115 <br /> Benzene 324 25 258 53 105 65-115 <br /> Cert-Butyl alcohol 8510 1000 7150 ND 119 75-120 <br /> Di-isopropyl ether 764 25 757 ND 101 75-125 <br /> 1 2-Dibromoethane(EDB) 850 25 742 ND 115 85-120 <br /> 1,2-Dichloroethane 670 25 736 ND 91 85-130 <br /> Ethanol 7480 5000 7070 ND 106 70-135 <br /> Ethyl tert-butyl ether 727 25 751 ND 97 75-130 <br /> Ethylbenzene 402 25 377 ND 107 75-135 <br /> Methyl tert-butyl ether 2660 25 351 2100 160 65-125 BB LM <br /> Toluene 1950 25 1860 ND 105 85-120 <br /> Des(total) 2280 25 2070 ND 110 85-125 <br /> ne Range Organics(C4-C12) 26200 2500 22000 1600 112 70-124 <br /> Surrogate 12-Dichloroethane-d4 1 71 250 68 60-135 <br /> Matrix Spike Dup(5115058-MSD1) Source MOI0324-04 Prepared&Analyzed 09/15/05 <br /> tert-Amyl methyl ether 748 25 ug/l 752 ND 99 80-115 3 15 <br /> Benzene 318 25 258 53 103 65-115 2 20 <br /> ter[-Butyl alcohol 7360 1000 7150 ND 103 75-120 14 25 <br /> Di-isopropyl ether 762 25 757 ND 101 75-125 0 3 15 <br /> l 2-Dibromoethane(EDB) 865 25 742 ND 117 85-120 2 15 <br /> 1,2-Dichloroethane 653 25 736 ND 89 85-130 3 20 <br /> Ethanol 6210 5000 7070 ND 88 70-135 19 35 <br /> Ethyl tert-butyl ether 730 25 751 ND 97 75-130 04 25 <br /> Ethylbenzene 394 25 377 ND 105 75-135 2 15 <br /> Methyl tert-butyl ether 2660 25 351 2100 160 65-125 0 20 BB LM <br /> Toluene 1910 25 1860 ND 103 85-120 2 20 <br /> Xylenes(total) 2250 25 2070 ND 109 85-125 1 20 <br /> Gasoline Range Organics(C4-C]2) 26000 2500 22000 1600 111 70-124 0 8 20 <br /> Surrogate 12-Dichloroeihane-d4 1 75 2.50 70 60-135 <br /> �uota Analytical -Morgan Hill The results in this report apply to the samples analysed in accordance wrth the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must he reproduced to its entirety <br /> Page 13 of 18 <br />