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ve <br /> Sequoia 885JarvisCis 5037 <br /> Morgan Hill CA 95037 <br /> ID (408)776-9600 <br /> mqW Analytical 09)782 6308 <br /> wwwwwseqequoialabs com <br /> • <br /> Secor- Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO261 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/04/06 13 28 <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 6012002 - EPA 5030B/5035A McOH 1 EPA 8260B <br /> Laboratory Control Sample(6C12002-BS2) Prepared&Analyzed 03/12/06 <br /> Ethylbenzene 0 301 0 050 mg/kg 0 273 110 80-135 <br /> Methyl tert-butyl ether 0 338 0 025 0 294 115 75-115 <br /> Toluene 145 0050 142 102 85-125 <br /> Xylenes(total) 178 0 050 1 53 116 80-140 <br /> -- - - - = - -_ - -- -- ---- --- <br /> Gasoline Range Organics(C4 C12) 196 25 165 _ 1 t9 60-140 <br />-=Surrogate 4-2-Dichloroethane d4 =0 00247 D 00250 99 60-125-- <br /> -Laboratory <br /> 0-125-L-aboratory Control Sample Dup(6C32002-BSD1) — - - - _ ---Prepared&Analyzed 03/12/06 <br /> Chlorobenzene 0 528 0 050 mg/kg 4 500 106�85E130-0 2 25 <br /> l 2-Dichlorobenzene 0 524 0 050 0 500 105 80-145 1 25 <br /> 1,3-Dichlorobenzene 0 541 0 050 0 500 108 80-130 2 25 <br /> l 4 Dichlorobenzene 0 519 0 050 0 500 104 80-135 08 20 <br /> Surrogate 4-BromoJluorobencene 000270 000250 108 75-120 <br /> Laboratory Control Sample Dup(6C12002-BSD2) Prepared&Analyzed 03/12/06 <br /> tert Amyl metliyl ether 0 637 0 025 mg/kg 0 612 104 80-130 14 25 <br /> Benzene 0 193 0 050 0 189 102 65-125 14 20 <br /> tert Butyl alcohol 5 71 5 0 633 90 80-165 20 25 <br /> Di isopropyl ether 0 593 0 025 0 609 97 85-115 12 20 <br /> l 2 Dibromoethane(EDB) 0 553 0 025 0 624 89 85-130 11 15 <br /> l 2-Dichloroethane 0 544 0 025 0 582 93 63-124 9 25 <br /> Ethanol 7 15 10 6 18 116 35-150 15 40 <br /> Ethyl ten 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 133 0050 142 94 85-125 9 15 <br /> Xylenes(total) 160 0 050 153 105 80-140 11 20 <br /> Gasol me Range Organics(C4-C 12) 16 2 2 5 165 98 60-140 19 25 <br /> Surt ogare 1 2-Dichloroelhane-d4 000246 " 000250 98 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 stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 19 of 20 <br />