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Sequoia CA 404 lane <br /> Walnut Creek CA 94598 <br /> 4 (925)988 9600 <br /> - - <br /> Analticaltical_- - - - - fAX(9z5)988 corn <br /> www sequoialabs coin <br /> ecor-Rancho Cordova Project Arco <br /> 017 Kilgore Rd Ste N 100 Project Number Arco# 4932 Reported <br /> Rancho Cordova CA 95670 Project Manager Rusty Benkosky 26-Jul-01 12 27 <br /> ' Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Inalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1G2001 i - EPA 50308(PIT) <br /> S(IG2001I-BS2) Prepared&Analyzed 24-Jul-01 <br /> ethyl tert-butyl ether 50 1 2 0 ug/1 500 100 70-130 <br /> rugate Dibromofluoromethane 540 - --50 0 108 50-150 <br /> rogale 12-Dichloroethane-d4 520 500 104 50-150 <br /> LCS(I G2001 I-BS3) Prepared&Analyzed 25-Jul-01 <br /> thyl tert-butyl ether 53 8 - - 2 0 ug/l - 50 0- - --- —108 70-130 - — — — - - <br /> rogate Drbromofluoromethane 560 500 112 50 150 <br /> Surrogate 1 2-Dichloroelhane-d4 500 300 100 50 150 <br /> trix Spike(1G2001i-MSI) Source W107223-04 Prepared&Analyzed 24-Jul-01 <br /> thyl tcrt-butyl ether 47 9 2 0 Ug/l Soo ND 959 60-150 <br /> Surrogate Dibromofluoromethane 490 -- 500 980 50-150 <br /> r1 2-Dichloroethane d4 470 500 940 50-150 <br /> #!Atrix Spike Dup(1G2001I-MSDI) Source W107223-04 Prepared 24-Jul-01 Analyzed 25-Jul-01 <br /> Mcthyl tcrt-butyl cthcr ------586 <br /> 586 2 0 ugA 500 ND 117 60-150 20 1 25 <br /> Drbromofluoromelhane 54 0 50 0 108 50-150t.g_te <br /> ugate 1,2-Dichloroethane-d4 510 500 104 50-150 <br /> 1 <br /> 1 <br /> 1 <br /> a Analytical -Walnut Creek The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 12 of 13 <br /> ca} <br />