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404 N Wiget tune <br /> Sequoia Watnut Creek CA 94598 <br /> e a (925)988-9600 <br /> - l y 4ical - - — - -- - - - - FAX www s98$(925) 9673 <br /> m `'} <br /> J equoialaUs com <br /> Jecor-Rancho Cordova Project Arco <br /> 017 Kilgore Rd,Ste #10() 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 1G16023- EPA 5030B(P/T) <br /> S(1G16023-BS2) Prepared&Analyzed 20-Jul-01 <br /> ethyl tert-butyl ether 2 14 020 mgAg 250 _ 956 70-130 <br /> Jrrogale Dibromofluoromethane _ 245 ;i 250 980 50 150 <br /> rogate 1 1-Dichloroeihane-d4 220 250 880 50-150 <br /> Matrix Spike(tG16023-MSI) Source W107036-01 Prepared&Analyzed 16-Jul-01 <br /> Ethyl tent-butyl ether - 2 76- - - 020 mglkg� 250 - ND - - 110 60-140 <br /> rogale Dibromofluoromelhane 245 250 980 50 150 <br /> Surrogate 12-Dichloroethane-d4 1 95 250 780 50-150 <br /> �atrix Spike Dup(1G16023-MSDI) Source WI07036-01 Prepared&Analyzed 16-Jul-01 <br /> thyl tert-butyl ether 304 020 mg/kg 250 ND 122 60-140 966 25 <br /> Surrogate Dibromofluoromethane 240 - " 150 960 50-150 <br /> V! 1 2-Dichloroethane-d4 20.5 250 820 50-150 <br /> G20011 -EPA 5030B(PIT) <br /> ank(IG2001I-BLK1) - Prepared&Analyzed 20-Jul-01 - <br /> anol ND 500 ugll <br /> tent-Butyl alcohol ND 20 <br /> ethyl tert-butyl ether ND 20 " <br /> -isopropyl ether ND 2 0 " <br /> yl tett-butyl ether ND 20 " <br /> vert-Amyl mcthyl ether ND 20 " <br /> [Dichloroethane ND 20 " <br /> -,ylcnc dtbromide ND 20 " <br /> Surrogate Drbromofluoromethane 470 500 940 50-150 <br /> Va te 12-Dwhloroethane-d4 460 500 92 0 50-150 <br /> 1 j <br /> • a Analytical- Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 10 of 13 <br />