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Y / \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> (D 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> W&F Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OLDS Services Client Project ID Unocal #5098, 5606 Pacific Ave Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6061488-498 Reported Jun 27, 1996 <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 S Chullakorn S Chullakorn S Chullakom S Chullakorn <br /> MS/MSD <br /> Batch# 6061493 6061493 6061493 6061493 <br /> Date Prepared 6/25/96 6/25/96 6/25/96 6/25/96 <br /> Date Analyzed 6/25/96 6/25/96 6/25/96 6/25/96 <br /> Instrument i D # HP 4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20 ug/L 20 yg/L 20 ug/L 60 jug/L <br /> Matrix Spike <br /> % Recovery 95 95 90 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 90 90 90 <br /> Relative % <br /> Difference 54 54 00 3 6 <br /> LCS Batch# 4LCS062596 4LCS062596 4LCS062596 4LCS062596 <br /> Date Prepared 6/25/96 6/25/96 6/25/96 6/25/96 <br /> Date Analyzed 6/25/96 6/25/96 6/25/96 6/25/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 80 85 85 85 <br /> % Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> Please Mote <br /> The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> O'griature on File the recovery of analytes from the matrix spike does not fall 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 /> 6061488 MPD <5> <br />