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Sequoia Walnut N. <br /> X94% <br /> D <br /> (925)988-9600 <br /> FAX(925)988-9673 <br /> Iw Analytical www.sequoWabsrALm <br /> Gettler Ryan,Inc.-Dublin Project: Chevron <br /> 6747 Sierra Court Suite 7 Project Number: Chevron ti 9-4275 Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 15-Mar-01 10:45 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1 C05013-EPA 5030B(PIT) <br /> Blank(IC05013-BLKI) Prepared&Analyzed: 02-Mar-01 <br /> Ethanol ND 500 ug/I <br /> tert-Butyl alcohol ND 50 <br /> Methyl Cert-butyl ether ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl'erl-butyl ether ND 2.0 — — _— <br /> tort-Amyl methyl ether ND 2.0 <br /> 1,2-Dichloroethane ND 2.0 " <br />_Ethylene dibromideND 2:0 <br /> Surrogate:DibromoJluoromerhane 53.0 50.0 106 50-150 <br /> Surrogate:l,2-Diehloroethone-d4 49.0 50.0 98.0 50.150 <br /> Blank(1C05013-BLK2) Prepared&Analyzed: 06-Mar-01 <br /> Ethanol ND 500 ug/1 <br /> tert-Butyl alcohol ND 50 <br /> Methyl tut-butyl ether ND 2.0 " <br /> Di-isopropyl ether ND 2.0 <br /> Ethyl tut-butyl ether <br /> ND 2.0 <br /> - <br /> tent-Amyl methyl ether ND 2.0 „ <br /> 1,2-Dichlomethane ND 2.0 " <br /> Ethylene dibromide ND 2.0 " <br /> Surrogate:Dibromofluoromethane 53.0 500 106 50-150 <br /> Surrogate:l,2-Dichlor+oethane-d4 49,0 50.0 98.0 50-150 <br /> LCS(l C05013-BS 1) Prepared&Analyzed:02-Mar-OI <br /> Methyl tert-butyl ether 48.3 2.0 ug/I 50.0 96.6 70-130 <br /> Surrogate:Dibrotnofluoramethane 51.0 50.0 101 50.150 <br /> Surrogate:1,2-Dichloroethane-d4 49.0 50.0 98.0 50-150 <br /> Sequoia Analytical- Walnut Creek The results in this•report apply io the samples analyzed in accordance with the chain <br /> custody document_ This analytical report must be reproduced in its entire. <br /> Page 12 of 14 <br /> ,c><x <br />