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V1� <br /> �$ Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> WWW sequotalabs com <br /> IJRS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number ]ntrtm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elanb 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> �1y Result Lumt Units Lavel Result %REC Lits RPD Lunt Notes <br /> Batch 3060630-EPA 5030 waters <br /> Matrix Spike Dn (3060630-MSDI) Source P306252-01 Prepared 06/24/03 Analyzed 06/25/03 <br /> Tert-amyl methyl ether 426 10 ugA 500 ND 85 70-116 16 20 <br /> Tertbutyl alcohol 121 20 100 10 111 62-142 3 20 <br /> Di-isopropyl ether 507 10 500 ND 101 71-121 6 20 <br /> Ethyl tert-butyl ether 469 10 500 ND 94 71-110 09 20 <br /> Methyl tert-butyl ether 128 050 " 500 84 88 77-123 5 20 <br /> Surrogate Dibromofluoromethane 487 450 108 84-122 <br /> Surrogate 1 2-Dichloroethaned4 440 450 98 74-135 <br /> Surrogate Toluene-& 465 450 103 84-119 <br /> Batch 3060638-EPA 5030 waters <br /> Blank(3060638-BLK1) Prepared&Analyzed 06/25/03 <br /> Tert-amyl methyl ether ND 10 ug/1 <br /> bury]alcohol ND 20 <br /> tsopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Mothyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 475 Soo 95 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 502 500 100 74-135 <br /> Surrogate Toluene-d8 511 500 102 84-119 <br /> Laboratory Control Sample(3060638-BS1) - Prepared&Analyzed 06/25/03 <br /> Tert-amyl methyl ether - 494 10 ug/l 500 99 70-116 <br /> Tort-butyl alcohol 110 20 100 110 62-142 <br /> fh-nopropyl ether 488 10 500 98 71-121 <br /> Ethyl tort butyl ether 470 10 " 5 00 94 71-110 <br /> Methyl tertbutyl ether 508 050 " 500 102 77-123 <br /> Surrogate Drbromofluoromethane 475 500 95 84-122 <br /> Surrogate 1 2-1)ichloroethaned4 500 500 100 74-135 <br /> Surrogate Toluene-d8 514 500 103 84-119 <br /> I <br /> I <br /> uola Analytical-Petallttna 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 24 of 27 <br />