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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 1900 Bates Avenue,Suite L Concord, CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 619 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> vIPD8 Services Client Protect ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4041376-88 Reported May 11, 1994 <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# 4041267 4041267 4041267 4041267 <br /> Date Prepared 5/4/94 5/4/94 5/4/94 5/4/94 <br /> Date Analyzed 5/4/94 5/4/94 5/4/94 5/4/94 <br /> Instrument I D # HP 4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20yg/L 20pg/L 20pg/L 60Mg/L <br /> Matrix Spike <br /> % Recovery 100 105 105 105 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 105 110 110 110 <br /> Relative% <br /> Difference 4 9 47 47 47 <br /> LCS Batch# 1 LCS050494 1 LCS050494 1 LCS050494 1 LCS050494 <br /> Date Prepared 5/4/94 5/4/94 5/4/94 5/4/94 <br /> Date Analyzed 5/4/94 5/4/94 5/4/94 5/4/94 <br /> Instrument I D # HP-4 HP-4 HP 4 HP-4 <br /> LCS % <br /> Recovery 95 96 97 99 <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 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 subfected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> A K interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 4041376 MPD <5> <br />