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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9690 FAX(415) 364 9233 <br /> 1900 Sates Avenue Suite L Concord, CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 'WPBS Services Client project Ib Unocal #2859, 1665 Pacgic Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedesslan CC Sample Group 4051180-86 Reported Jun 10, 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 Fantecha <br /> MS/MSD <br /> Batch# <br /> Date Prepared - <br /> Date Analyzed - <br /> Instrument I D # - - <br /> Conc Spiked - - <br /> Matrix Spike <br /> % Recovery <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery - <br /> Relative% <br /> Difference - <br /> LCS Batch# 1 LCS060394 1 LCS060394 1 LCS060394 1 LCS060394 <br /> Date Prepared 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Date Analyzed 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP 2 <br /> LCS% <br /> Recovery 105 102 103 103 <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 subjected 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 /> Interference,the LCS recovery 1s to be used to validate the batch <br /> B Ke <br /> Project Man ger <br /> 4051180 MPD <3> <br />