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985 Jarvis Dnve <br /> HI <br /> ` Sequoia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> Analytical wseq o 782-630n <br /> www equialabs corn <br /> URS Corporation[Arcot] Project ARCO#2093,Tracy,CA MOL0332 <br /> 2870 Gateway Oaks Dr,Ste 300 Protect Number GOCIP-0006 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 12/13/05 16 37 <br /> I <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br />' Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5LO9024-EPA 5030B P/T/EPA 9260B <br /> Matrix Spike(5L09024-MSI) Source MOL0180-01 Prepared&Analyzed 12/09/05 <br /> tert-Amyl methyl ether 00151 00050 mg/kg 00150 ND 101 80-130 <br /> Benzene 000511 00050 000516 000036 92 65-125 <br /> tert-Butyl alcohol 0 363 0 020 0 143 0 18 128 80-135 <br /> D,-Isopropyl ether 00147 00050 00151 ND 97 85-115 <br /> 1,2-Dtbromoethane(EDB) 00153 00050 00149 ND 103 85-130 <br /> 1,2-Dichloroethane 00128 00050 00147 ND 87 63-124 <br /> Ethanol 0116 010 0142 ND 82 35-150 <br /> Ethyl tert-butyl ether 00149 00050 „ 00150 ND 99 80-125 <br /> Ethylbenzene 000723 00050 000754 ND 96 80-135 <br /> Methyl tert-butyl ether 000879 00050 000702 00022 94 75-115 <br /> Toluene 00333 00050 00372 000069 88 85-125 <br /> bXylenes(total) 00393 00050 " 00412 000044 94 80-140 <br /> Gasoline Range Organics(C4-C 12) 0 621 0 10 0 440 010 118 53-126 <br /> Surrogate 11-Dtchloroethane-d4 000401 000500 80 60-115 <br /> Matrix Spike Dup(5L09024-MSD1) Source MOL0180-01 Prepared&Analyzed 12/09/05 <br /> tert-Amyl methyl ether 00146 00050 mg/kg 00150 ND 97 80-130 3 25 <br /> Benzene 000496 0 0050 000510 000036 89 65-125 3 20 <br /> Cert Butyl alcohol 0 362 0 020 0 143 0 18 127 80-135 0 3 20 <br /> Di isopropyl ether 00143 00050 00151 ND 95 85-115 3 20 <br /> 1,2-Dtbromoethane(EDB) 00148 00050 00149 ND 99 85-130 3 15 <br /> 1,2-Dtchloroethane 00124 00050 00147 ND 84 63-124 3 25 <br /> Ethanol 0117 010 0142 ND 82 35-150 09 40 <br /> Ethyl tert-butyl ether 00145 00050 00150 ND 97 80-125 3 25 <br /> Ethylbenzene 000721 00050 000754 ND 96 80-135 0 3 20 <br />' Methyl tert-butyl ether 000911 00050 0 00702 00022 98 75-115 4 35 <br /> Toluene 00323 00050 00372 000069 85 85-125 3 15 <br /> Xylenes(total) 00393 00050 00412 000044 94 80-140 0 20 <br /> Gasoline Range Organics{C4-C 12) 0 597 1111 0 440 0 10 113 53-12.6 4 25 <br /> Surrogate 1 1-Dtchloroethane-d4 000404 000500 81 60-125 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 8 <br />