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i <br /> 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)666 9689 <br /> ill Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> qkPb$ Services Client Project Ifs Unocal #0187, 437 E Miner Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarian CSC Sample Group 5021294-96 Reported Mar 7, 1995 <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# 5021682 5021682 5021682 5021682 <br /> Date Prepared 3/1/95 3/1/95 3/1/95 3/1/95 <br /> Date Analyzed 3/1/95 3/1/95 3/1/95 3/1/95 <br /> Instrument I D.# HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20pg/L 20,ug/L 20Ng/L 60pg/L <br /> Matrix Spike <br /> % Recovery 85 90 95 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 95 95 97 <br /> Relative% <br /> Difference 57 54 0 0 4 2 <br /> LCS Batch# 2LCS030195 2LCS030195 2LC8030195 2LCS030195 <br /> Date Prepared 3/1/95 3/1/95 3/1/95 3/1/95 <br /> Date Analyzed 3/1/95 3/1/95 3/1/95 3/1/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery. 85 94 95 96 <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 /> Ignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan 8 Kemp Interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 5021294 MPD <3> <br />