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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> realian Engineering,Inc Client Project 1D Former Unocal #5098, 5606 Pacific Ave <br /> 1 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 3061150-53 Reported Jul 14, 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 J F J F J F J F <br /> Cone Spiked 20 20 20 60 <br /> Units ug/L u9/L ug/L ug/L <br /> LCS Batch# 2LCS070193 2LCS070193 2LCS070193 2LC6070193 <br /> Date Prepared 7/1/93 7/1/93 7/1/93 7/1/93 <br /> Date Analyzed 7/1/93 7/1/93 7/1/93 7/1/93 <br /> Instrument I D# HP-4 HP-4 HP 4 HP-4 <br /> LCS <br /> 0 Recovery 94 95 97 100 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# 3061153 3061153 3061153 3061153 <br /> Date Prepared 7/1/93 7/1/93 7/1/93 7/1/93 <br /> Date Analyzed. 7/1/93 7/1/93 7/1/93 7/1/93 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Matrix Spike <br /> % Recovery* 95 95 95 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 95 95 95 100 <br /> Relative% <br /> Difference 0 0 00 00 0 0 <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 /> ` e and are not used to accept or reject batch results <br /> tan 8 Khemp -oject Manager <br /> 3061150 KEI <6> <br />