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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave , Stockton <br /> 401 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Goup 3060894-897 Reported Jul 1, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Phenol 2 Chlorophenol 1,4-Dichloro- N-Nitroso-Di- 1,2,4-Tnchloro- 4-Chloro-3- <br /> benzene ___N-propylarnine benzene Meth I hen I <br /> Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst Son Le Son Le Son Le Son Le Son Le Son Le <br /> Conc Spiked 200 200 100 100 100 200 <br /> Units ug/L k9/L pg/L pg/L Fig/L k9/L <br /> LCS Batch# LCS062293 LCS062293 LCS062293 LCS062293 LCS062293 LCS052293 <br /> Date Prepared 6/22/93 6/22/93 6/22/93 6/22/93 6/22/93 6/22/93 <br /> Date Analyzed 6/23/93 6/23/93 6/23/93 6/23/93 6/23/93 6/23/93 <br /> Instrument I D # GC/MS1 GC/MS1 GC/MS1 GC/MS1 GC/MS1 GC/MS1 <br /> LCS <br /> soRecovery 65 59 60 70 66 71 <br /> Control Limits 12-89 27-123 36-97 41-116 3998 23-97 <br /> MS/MSD <br /> Batch# BLK062293 BLK062293 BLK062293 BLK062293 BLK062293 BLK062293 <br /> Date Prepared 6/22/93 6/22/93 6/22/93 6/22/93 6/22/93 6/22/93 <br /> Date Analyzed 6/23/93 6/23/93 6/23/93 6/23/93 6/23/93 6/23/93 <br /> Instrument I D # GC/MS1 GC/MS1 GC/MS1 GC/MS1 GC/MSI GC/MSi <br /> Matrix Spike <br /> % Recovery 65 59 60 70 66 71 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 77 70 68 82 74 83 <br /> Relative% <br /> Difference 17 17 13 16 11 16 <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 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 /> Alan emp� <br /> Project Manager Page 1 of 2 <br /> 3060894 KEI <8> <br />