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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> 0prealian Engineering, Inc Client Project 1D Unocal, 2835 Navy Dr , Stockton <br /> 01 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E CC Sample Croup 3051491-1497 Reported Jun 8, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method EPA 8020 EPA 8024 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst J F J F J F J F K Amer <br /> Conc Spiked 20 20 20 60 300 <br /> Units Yg/L Ing/L ug/L Ng/L ug/L <br /> LCS Batch# 2LCS060493 2LCS060493 2LCS060493 2LCS060493 BLK060493 <br /> Date Prepared 6/4/93 6/4/93 6/4/93 6/4/93 6/4/93 <br /> Date Analyzed 6/4/93 6/4/93 6/4/93 6/4/93 6/8/93 <br /> Instrument I D # HP 4 HP 4 HP 4 HP-4 HP-3B <br /> LCS % <br /> Recovery 88 88 91 91 93 <br /> Control Limits 70 130 70-130 70 130 70 130 80-120 <br /> MS/MSD <br /> Batch # 3051491 3051491 3051491 3051491 060493 <br /> Date Prepared 6/4/93 6/4/93 6/4/93 6/4/93 6/4/93 <br /> Date Analyzed 6/4/93 6/4/93 6/4/93 6/4/93 6/8/93 <br /> Instrument I D # HP 4 HP-4 HP 4 HP-4 HP 3B <br /> Matrix Spike <br /> % Recovery 85 85 90 90 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 90 90 92 95 <br /> Relative % <br /> Difference 57 57 00 22 21 <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 /> cots A Cllleffo <br /> Project Manager <br /> 3051491 KEl <5> <br />