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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 #5098, 5606 Pacific Ave , Stockton <br /> 01 Stanwell Or, Ste 400 Matrix Water <br /> oncord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 3031170-73 Reported Apr 7, 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 JF J F JF JF <br /> Conc Spiked 20 20 20 60 <br /> Units ug/L u9/L Ing/L ug/L <br /> LCS Batch# 2LCS033193 2LCS033193 2LCS033193 2LCS033193 <br /> Date Prepared 3/31/93 3/31/93 3/31/93 3/31/93 <br /> Date Analyzed 3/31/93 3/31/93 3/31/93 3/31/93 <br /> Instrument I D # HP-2 HP 2 HP 2 HP 2 <br /> LCS % <br /> Recovery 113 108 108 110 <br /> Control Limits 70-130% 70-130° 70-130% 70-130% <br /> MS/MSD <br /> Batch # 3031160 3031160 3031160 3031160 <br /> Date Prepared 3/31/93 3/31/93 3/31/93 3/31/93 <br /> Date Analyzed 3/31/93 3/31/93 3/31/93 3/31/93 <br /> Instrument I D # HP 2 HP-2 HP 2 HP-2 <br /> Matrix Spike <br /> % Recovery 115 110 110 112 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 115 110 110 112 <br /> Relative % <br /> Difference 00 00 00 00 <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/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Scott A Chieffo <br /> Project Manager 3031170 KEI <6> <br />