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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> MPDS Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 3121489-92 Reported Jan 7, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes 1,1-Dichloro- Tnchloro- Chloro <br /> Benzene ethene ethene benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst A T/J F AT/J F A T/J F A T/J F K Nill K Nill K Nill <br /> MS/MSD <br /> Batch# 3121624 3121624 3121624 3121624 3121489 3121489 3121489 <br /> Date Prepared 1/3/94 1/3/94 1/3/94 1/3/94 12/30/93 12/30/93 12/30/93 <br /> Date Analyzed 1/3/94 1/3/94 1/3/94 1/3/94 12/30/93 12/30/93 12/30/93 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 HP5890/1 HP5890/1 HP5890/1 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60u9/L 10ug/L 10ug/L 10ug/L <br /> Matrix Spike <br /> % Recovery 105 105 105 105 97 100 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 105 105 105 110 110 100 <br /> Relative % <br /> Difference 00 00 0 0 00 13 95 2 0 <br /> LCS Batch# 1 LCS010394 1 LCS010394 1 LCS010394 1 LCS010394 BLK123093 BLK123093 BLK123093 <br /> Date Prepared 1/3/94 1/3/94 1/3/94 1/3/94 12/30/93 12/30/93 12/30/93 <br /> Date Analyzed 1/3/94 1/3/94 1/3/94 1/3/94 12/30/93 12/30/93 12/30/93 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 HP5890/1 HP5890/1 HP5890/1 <br /> LCS % <br /> Recovery 97 98 98 100 95 110 100 <br /> ecovery <br /> Control Limits 71-133 72-128 72-130 71-120 28-167 35-146 38-150 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> EQUOIA ANALYTICAL 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 subfected to the entire analytical procedure It <br /> I the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoveryis to be used to validate the batch Alan Kerr1�,�� <br /> Project Mar�a`ger <br /> 3121489 MPD <6> <br />