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® SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> l�aprealian Engineering, Inc Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Goup 3091460-1463 Reported Oct 13, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloroethene Chloro- <br /> ethene benzene <br /> Method EPA 6010 EPA 8010 EPA 8010 <br /> Analyst K Nil] K Noll K Nill <br /> Conc Spiked 10 10 10 <br /> Units ug/L ug/L ug/L <br /> LCS Batch# LCS101193 LCS101193 LCS101193 <br /> Date Prepared 10/11/93 10/11/93 10/11/93 <br /> Date Analyzed 10/11/93 10/11/93 10/11/93 <br /> Instrument I D # HP-5890/1 HP-5890/1 HP-5890/1 <br /> LCS % <br /> 4DRecovery 110 96 91 <br /> Control Limits 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 3091463 3091463 3091463 <br /> Date Prepared 10/11/93 10/11/93 10/11/93 <br /> Date Analyzed 10/11/93 10/11/93 10/11/93 <br /> Instrument I D # HP-5890/1 HP-5890/1 HP 5890/1 <br /> Matrix Spike <br /> % Recovery 91 100 96 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 100 95 <br /> Relative % <br /> Difference 19 0 0 00 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> EOUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> 73' <br /> validation of sample batch results Due to matrix effects the OC limits for MS/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> AlarrB KempL77---� <br /> Project Manager 3091460 KEI <7> <br />