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N. Wlget Lane <br /> Sequoia WalnutOCr eek,CA 94598 <br /> (925)988-9600 <br /> 45)- <br /> Analytical FAX(925)988-9673 <br /> settler Ryan,Inc.-Dublin Project: Unocal <br /> 6747 Sierra Court Suite 7 Project Number: Unocal SS# 11195 Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 09-Sep-99 17:35 <br /> Volatile Organic Compounds by EPA Method 8260A - 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 9H25009: Prepared 24-Aug-99 Using EPA 5030B [PIT] <br /> Blank(9H25009-BLKI) <br /> lett-Butyl alcohol ND too ugll <br /> Methyl tert-butyl ether ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl tert-butyl ether ND 2.0 " <br /> ter(-Amyl methyl ether ND 2.0 " <br /> Surrogate:Dibrantofluarornethmre 50.0 50.0 100 50-150 <br /> Surrogate: 1,2-Dichloroelhmre-d4 49.0 50.0 95.0 50-150 <br /> LCS (9H25009-BSI) <br /> Methvl tert-butyl ether 49.6 2.0 ug/I 50.0 97.2 70-130 <br /> Surrogate:Dibr•ornofluoronredrane 49.7 50.0 99.4 50-151 <br /> iirogatc,' 1.2-Dichloroefhane-d4 45.0 50.0 96.0 50-150 <br /> =:1 <br /> Matrix Spike(9H25009-MSI) Source: W908259-08 <br /> Mathyl tert-butyl ether 47.4 2.0 uril 500 2.2 904 60-140 <br /> Surrogate:Dibronrofluor•onrelhane 48.6 50.0 973 50-150 <br /> Surrogaler 1,1-Dichloroelhane-dJ 46.1 50.0 92.1 511-150 <br /> Matrix Spike Dup (9H25009-MSD1) Source: W908259-08 <br /> Methvi tart-hutyl ether 48.3 2.0 ugil 50.0 2.2 92.2 60-140 1.98 25 <br /> i <br /> Surrogate:Dibrourofluoronrethane 48.8 50.0 9'.6 50-150 <br /> Surrogate: 1.1-Dicirloraclharrc-d4 47.1 520 94.6 RI-150 j <br /> Et <br /> I <br /> f <br /> I <br /> I <br /> Sequoia Analytical - Walnut Creek The results•in this•report apply to the srvriple_r analyzed in ciccorc&mee with the chain of <br /> custody document.This arnlyficrrl report nnrs7 he reproduced in ifs errrirely. <br /> u e Pegley, Project MaruiYer Page 6 of 7 <br />