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SEQUOIA 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 #5098, 5606 Pacific Ave , Stockton <br /> 401 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 3091460-1463 Reported Oct 13, 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 /> Ana lyst JF JF J F J F <br /> Conc Spiked 20 20 20 20 <br /> Units ug/L ug/L ug/L ug/L <br /> LCS Batch# 3LCS100793 3LCS100793 3LCS100793 3LCS100793 <br /> Date Prepared 10/7/93 10/7/93 10/7/93 10/7/93 <br /> Date Analyzed 10/7/93 10/7/93 10/7/93 10/7/93 <br /> Instrument I D # HP 5 HP-5 HP-5 HP 5 <br />. LCS % <br /> Recovery 123 118 116 113 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 3091300 3091300 3091300 3091300 <br /> Date Prepared 10/7/93 10/7/93 10/7/93 10/7/93 <br /> Date Analyzed 10/7/93 10/7/93 10/7/93 10/7/93 <br /> i <br /> Instrument I D # HP-5 HP-5 HP-5 HP 5 <br /> Matrix Spike <br /> % Recovery 110 100 85 107 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 120 115 115 110 <br /> Relative % <br /> Difference 95 14 30 28 <br /> SEQUOIA ANALYTICAL Please Note <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 flue to matrix effects the QC limits for MS/MSD's are advisory only <br /> I and are not used to accept or reject batch results <br /> Alan Kemp (T <br /> Project Manager-' 3091460 KEI <6> <br />