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SEQUOIAA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> prealian Engineering, Inc Client Project ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 01 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 3101239-51 Reported Nov 5, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J F J F J F J F <br /> Cone Spiked 20 20 20 60 <br /> Units pg/L ug/L ug/L Pg/L <br /> LCS Batch# 3LCS102793 3LCS102793 3LCS102793 3LCS102793 <br /> Date Prepared 10/27/93 10/27/93 10/27/93 10/27/93 <br /> Date Analyzed 10/27/93 10/27/93 10/27/93 10/27/93 <br /> Instrument I D # HP-5 HP 5 HP 5 HP 5 <br /> LCS <br /> lbRecovery 120 114 107 106 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 3101233 3101233 3101233 3101233 <br /> Date Prepared 10/27/93 10/27/93 10/27/93 10/27/93 <br /> Date Analyzed 10/27/93 10/27/93 10/27/93 10/27/93 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Matrix Spike <br /> % Recovery 125 120 120 115 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 95 95 <br /> Relative % <br /> Difference 22 18 23 19 <br /> SEQUOIA ANALYTICAL Please(vote <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> \ validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> --� and are not used to accept or reject batch results <br /> AarnI5 emp <br /> Project Manager <br /> 3101239KE] t4> <br />