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Sequoia 680 Chesapeake Dnve 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 /> �II Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> OMP08 Services Client Project ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedisslan CSC Sample Group 5011287-299 Reported Feb 10, 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 M Creusere M Creusere M Creusere M Creusere <br /> MS/MSD <br /> Batch# 5011284 5011284 5011284 5011284 <br /> Date Prepared 2/2/95 2/2/95 2/2/95 2/2/95 <br /> Date Analyzed 2/2/95 2/2/95 2/2/95 2/2/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20yg/L 20pg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 70 90 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 70 90 95 98 <br /> Relative% <br /> Difference 00 00 0 0 10 <br /> LCS Batch# 2LCS020195 2LCS020195 2LCS020195 2LCS020195 <br /> Date Prepared 2/1/95 2/1/95 2/1/95 2/1/95 <br /> Date Analyzed 2/1/95 2/1/95 2/1/95 2/1/95 <br /> Instrument I D # HP 4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 73 92 97 100 <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 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> .Signature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery 1s to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 5011287 MPD <7> <br />