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885 Jarvis Drive <br /> 15� (409) <br /> Morgan Hill CA 95637 <br /> Sequoia (468)„6 9666 <br /> � www sequoi Analytical FAX6908 <br /> quotalabs coin <br /> • <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO246 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/11/06 09 55 <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 °/oREC Limits - RPD Limit Notes <br /> Batch 6C12002-EPA 5030B/5035A McOH I EPA 8260B <br /> Laboratory Control Sample(6C12002-BS2) Prepared&Analyzed 03/12/06 <br /> Cert-Amyl methyl ether 0 730 0 025 mg/kg 0 612 119 80-130 <br /> Benzene 0 221 0 050 0 189 117 65-125 <br /> tert-Butyl alcohol 695 50 633 110 80-165 <br /> Di-isopropyl ether _ _ - 0 667 0 025 0 609 110 85-115 - - - f- --- - - <br /> l 2 Dtbromoethane(EDB) 0616 0 025 0 624 99---- 85=130 f <br />—1-2-Dichloroethane 0 594 0 025 0 582 102 63-124 <br /> Ethanol 827 10 6 18 134 35-150 <br />=Ethyl tert-butyl ether TT T ~ _ µ 0709-0025— --- -0 615 a 115 -80-125 _ <br /> Ethylbenzene 0 301 0 050 0 273 110 80-135 <br /> Methyl tert-bury!ether 0 338 0 025 0 294 115 75-115 <br /> Toluene 145 0050 142 102 85-125 <br /> Xylenes(total) 178 0 050 153 116 80-140 <br /> Gasoline Range Organics(C4-C 12) 19 6 2 5 165 119 60-140 <br /> Sirrrogale l 2-Dechloroethane-d4 000247 000250 99 60-125 <br /> Laboratory Control Sample Dup(6C12002-BSD2) Prepared&Analyzed 03/12/06 <br /> tert-Amyl methyl ether 0 637 0 025 mg/kg 0612 104 80-]30 14 25 <br /> Benzene 0 193 0 050 0 189 102 65-125 14 20 <br /> terl-Butyl alcohol 571 5 0 633 90 80-165 20 25 <br /> Di-isopropyl ether 0 593 0 025 0 609 97 85-115 12 20 <br /> 1 2-Dtbromoethane(EDB) 0 553 0 025 0 624 89 85-130 11 15 <br /> 1,2-Dtchloroethane 0 544 0 025 0 582 93 63-124 9 25 <br /> Ethanol 715 10 618 116 35-150 15 40 <br /> Ethyl tert-butyl ether 0 631 0 025 0 615 103 80-125 12 25 <br /> Ethylbenzene 0 270 0 050 0 273 99 80-135 11 20 <br /> Methyl tert-butyl ether 0 305 0 025 0 294 104 75-115 10 35 <br /> Toluene 1 33 0 050 142 94 85-125 9 15 <br /> Xylenes(total) 160 0 050 1 53 105 80-140 11 20 <br /> Gasoline Range Organics(C4 C12) 16 2 2 5 165 98 60-140 19 25 <br /> Surrogate l 2-Dechloroethane-d4 000246 000250 98 60-125 <br /> Sequoia Analytical- Morgan Hill The results in this report apply to the samples analyzed to accordance with the chain of <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 25 of 28 <br />