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Sequoia 680 Chesapeake Dnve Redwood Cary,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 4D 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OMITS Services Client Project I0 Unocal #6981, 4707 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan QC Sample Group 5041776-88 Reported May 12, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 5050097 5050097 5050097 5050097 <br /> Date Prepared 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Date Analyzed 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 20ug/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 105 105 110 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 115 115 115 117 <br /> Relative <br /> Difference 91 91 44 44 <br /> LCS Batch# 1 LCS050795 1 LCS050795 1 LCS050795 1 LCS050795 <br /> Date Prepared 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Date Analyzed' 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 115 115 121 119 <br /> Recovery <br /> Control Limits- 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> Signature on File the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 5041776MPD <6> <br />