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,G)— 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 /> WO Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> PDS Services Client Project ID Unocal #5421, 7303 Pacific Ave, Stockton <br /> 401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4060357-60 Reported Jun 21, 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# 4060393 4060393 4060393 4060393 <br /> Date Prepared 6/17/94 6/17/94 6/17/94 6/17/94 <br /> Date Analyzed 6/17/94 6/17/94 6/17/94 6/17/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20pg/L 20ug/L 20ftg/L 60Ng/L <br /> Matrix Spike <br /> % Recovery 100 95 95 95 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 95 98 <br /> Relative% <br /> Difference 51 00 00 31 <br /> LCS Batch# 3LCS061694 3LCS061694 3LCS061694 3LCS061694 <br /> Date Prepared 6/17/94 6/17/94 6/17/94 6/17/94 <br /> Date Analyzed 6/17/94 6/17/94 6/17/94 6/17/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 99 98 98 99 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS 1s 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 /> F the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> F1 interference,the LCS recovery 1s to be used to validate the batch <br /> AKe <br /> reject Ma ger <br /> 4060357 MPD <5> <br />