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A Sequoia 680 Chesapeake Drive Redwood CIM CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 1-5) Analytical 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �t�5 Services Client Project ID Unocal #5098, 5606 Pacific Avenue, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarian QC Sample Group 5020647-652 Reported Mar 2, 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# 5020740 5020740 5020740 5020740 <br /> Date Prepared 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Date Analyzed: 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Instrument I D #' HP-5 HP-5 HP-5 HP-5 <br /> Conn Spiked 20lig/L 20 Ps/L 20 Ng/L 60pg/L <br /> Matra Spike <br /> %Recovery. 110 110 105 105 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 110 110 105 103 <br /> Relative% <br /> Difference 00 00 0 0 1 9 <br /> LCS Batch# 3LCS021395 3LCS021395 3LCS021395 3LCS021395 <br /> Date Prepared. 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Date Analyzed 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Instrument I.D # HP-5 HP-5 HP-5 HP-5 <br /> LCS% <br /> Recovery: 109 106 106 103 <br /> % ecovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS 1s 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 /> OSignature 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 is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 5020647 MPD <4> <br />