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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 Former Unocal #5098, 5606 Pacific Ave <br /> 401 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Goup 3061150-53 Reported Jul 14, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloroethene Chloro- <br /> ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K Nill K Nill <br /> Conc Spiked 10 10 10 <br /> Units ltg/L pg/L pg/L <br /> LCS Batch# LCS070893 LCS070893 LCS070893 <br /> Date Prepared 7/8/93 7/8/93 7/8/93 <br /> Date Analyzed 7/8/93 7/8/93 7/8/93 <br /> Instrument I D # HP5890/6 HP5890/6 HP5890/6 <br /> LCS % <br /> Recovery 90 99 100 <br /> Control Limits 70-130 70-130 70-13D <br /> MS/MSD <br /> Batch # 3061063 3061063 3061063 <br /> Date Prepared 7/8/93 7/8/93 7/8/93 <br /> Date Analyzed 7/8/93 7/8/93 7/8/93 <br /> Instrument I D # HP5890/6 HP5890/6 HP5890/6 <br /> Matrix Spike <br /> % Recovery 97 110 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 93 110 100 <br /> Relative % <br /> Difference 42 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 /> j�S,1E11Ul0IA ANALYTICAL 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/MSD's are advisory only <br /> - and are not used to accept or reject batch results <br /> emp <br /> rolect Manager <br /> 3061150 KEI <7> <br />