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885 Jarvis Dnve <br /> Hill CA 95037 <br /> Sequoia Morgan(408)776-9600 <br /> FAX(408)782-6308 <br /> qWAnalytical www sequoialabs corn <br /> —0 <br /> SecOC-Rancho Cordova(ARCO) Project ARCO 42133,Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco 42133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 03/31/06 14 03 <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 %REC Limits RPD Limit Notes <br /> Batch 6C16020-EPA 5030B P/T 1 EPA 8260B <br /> Blank(6C16020-BL,K1) Prepared&Analyzed 03/16/06 <br /> Surrogate Drbromofluoromethane 232 ug/1 250 93 65-130 <br /> Surrogate 4-Bromofluoroben_ene 228 11250 91 70-120 <br /> Laboratory Control Sample(6C16020-B51) Prepared 03/16/06 Analyzed 03/17/06 <br /> Cert Amyl methyl ether - "- - - - 15 4- -- --0 50 - ug/E - ---163 - - W --94-- 80-115 <br />_Benzene 548 0 50 504 109 65-115 <br /> tent-Butyl alcohol 147 20— —" 169 87 75=150— <br />,_, D-i-isopropyl ether - - - - -- 18 8 - - -0 50 - - - 16 2 - 116 75-125_ <br /> 1 2 Dibromoethane(EDB) 14 9 —6-50—" 16 6 90 85=120 <br /> 1 2-Dichloroethane 118 050 15 5 76 85-130 HM,PF <br /> E=thanol 207 300 165 125 70-135 IC <br /> Ethyl tert-butyl ether 15 5 050 16 4 95 75-130 <br /> Ethylbenzene 727 0 50 728 100 75-135 <br /> Methyl tert butyl ether 1686 0 50 7 84 88 65-125 <br /> roluene 36 0 0 50 38 0 95 85-120 <br /> Xylenes(total) 44 1 050 40 8 108 85-125 <br /> Gasoline Range Organics(C4-C12) 432 50 440 98 60-140 <br /> Surrogate 12 Dichloroethane-d4 181 250 72 60-135 <br /> Surrogate Toluene-d8 260 250 104 70-120 <br /> Surrogate Dibromofluoromethane 233 250 93 65-130 <br /> Surrogate 4-Bromofluorobenzene 240 250 96 70-120 <br /> Laboratory Control Sample Dup(6C16020-BSD1) Prepared 03/16/06 Analyzed 03/17/06 <br /> cert Amyl methyl ether 15 9 050 ug/l 16 3 98 80-115 3 15 <br /> Benzene 578 0 50 504 115 65-115 5 20 <br /> tert-Butyl alcohol 145 20 169 86 75-150 1 25 <br /> Di-isopropyl ether 19 3 0 50 162 119 75-125 3 15 <br /> 1 2-Dibromoethane(EDB) 149 050 166 90 85-120 0 15 <br /> 1,2 Dichloroethane 11 7 050 155 75 85-130 0 9 20 HM,PF <br /> Ethanol 225 300 165 136 70-135 8 35 HL,IC <br /> Ethyl tori butyl ether 15 9 050 164 97 75-130 3 25 <br /> Ethylbenzene 759 050 728 104 75-135 4 15 <br /> Methyl ten-butyl ether 6 86 050 7 84 88 65-125 0 20 <br /> 1 oluene 36 9 0 50 380 97 85-120 2 20 <br /> Xylenes(total) 460 050 408 113 85-125 4 20 <br /> Gasoline Range Organics(C4-C 12) 453 50 440 103 60-140 5 25 <br /> The results in this report apply to the samples analyzed in accordance with he chain of <br /> Sequoia Analytical -Morgan Hill <br /> custody document Unless otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 18 of 20 <br />