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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, Inc Client Project ID Unocal #2859, 1665 Pacific Ave, Stockton <br /> 2401 Stanwell Dr. Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedisslan QC Sample Group 4021427-33 Reported Mar 8, 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# 4021422 4021422 4021422 4021422 <br /> Date Prepared 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Date Analyzed 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Instrument I D # HP-2 HP 2 HP 2 HP-2 <br /> Cone Spiked 20ug/L 20 fug/L 20kg/L 60pg/L <br /> Matrix Spike <br /> %Recovery 1o5 105 105 105 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 100 100 102 <br /> Relative % <br /> Difference 47 4 9 49 29 <br /> LCS Batch# 1 LCS030194 1 LCS030194 1 LCS030194 1 LCS030194 <br /> Date Prepared 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Date Analyzed 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP 2 <br /> LCS % <br /> Recovery 107 104 105 106 <br /> Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <br /> Please Nate <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> .SEQUOIA 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 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 recove is to be used to validate the batch <br /> A Kem <br /> Project Ma r <br /> 4021427 MPD <4> <br />