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(1) 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 /> 4IIW Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> QMPDS Services Client project IC Unocal #0187, 437 5 Miner Ave , Stockton <br /> 2401 Stanwell Dr , Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4111336-338 Reported Dec 5, 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 A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 4111303 4111303 4111303 4111303 <br /> Date Prepared 11/30/94 11/30/94 11/30/94 11/30/94 <br /> Date Analyzed 11/30/94 11/30/94 11/30/94 11/30/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conic Spiked 20jtg/L 2opg/L 2opg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 75 85 90 95 <br /> 0 Matrix Spike <br /> Duplicate% <br /> Recovery 80 90 90 95 <br /> Relative% <br /> Difference 65 56 00 00 <br /> LCS Batch# 2LCS113094 2LCS113094 2LCS113094 2LCS113094 <br /> Date Prepared 11/30/94 11/30/94 11/30/94 11/30/94 <br /> Date Analyzed 11/30/94 11/30/94 11/30/94 11/30/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 88 98 102 104 <br /> % Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS rs 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 /> Ognature 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 is to be used to validate the batch <br /> Project Manager <br /> 4111336 MPD <3> <br />