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4 -4 Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686-9600 FAX(510)686 9689 <br /> qIF Analytical 819 Sinker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 1*PDS Services Client Project Its Unocal #5098, 5606 Pacific Avenue, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan OC Sample Group 5020647-652 Reported Mar 2, 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 A.Tuzon A.Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 5020620 5020620 5020620 5020620 <br /> Date Prepared 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Date Analyzed 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20 fug/L 20mg/L 20 frg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 105 100 105 105 <br /> 0 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 105 105 107 <br /> Relative% <br /> Difference 47 2 0 00 19 <br /> LCS Batch# 1 LCS021395 1 LCS021395 1 LCS021395 1 LCS021395 <br /> Date Prepared- 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Date Analyzed 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Instrument 1 D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 107 103 106 106 <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 /> ignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery 1s to be used to validate the batch <br /> Project Manager <br /> 5020647 MPD <5> <br />