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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> t10vIPOS Services Client Project ID Unocal #2859, 1665 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC 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 Fontecha <br /> MS/MSD <br /> Batch# 4051290 4051290 4051290 4051290 <br /> Date Prepared 6/5/94 6/5/94 6/5/94 6/5/94 <br /> Date Analyzed 6/5/94 6/5/94 6/5/94 6/5/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conic Spiked 20 pg/L 20 erg/L 20 Ng/L 60 pg/L <br /> Matrix Spike <br /> % Recovery 110 110 110 110 <br /> i� Matrix Spike <br /> Duplicate% <br /> Recovery 115 115 115 112 <br /> Relative% <br /> Difference 44 44 44 18 <br /> LCS Batch# 1 LCS060394 1 LCS060394 1 LCS060394 1 LCS060394 <br /> Date prepared 6/5/94 6/5/94 6/5/94 6/5/94 <br /> Date Analyzed 6/5/94 6/5/94 6/5/94 6/5/94 <br /> Instrument l D # HP-2 HP-2 HP-2 HP-2 <br /> LCS% <br /> Recovery 108 104 105 106 <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 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 is to be used to validate the batch <br /> Ala Kern <br /> P sect M er <br /> 4051180 MPD <5> <br />