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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> *7F Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *PDS Services Client Project ID Unocal #2859, 1665 Pacific Ave,Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6020685-696 Reported Mar 1, 1996 <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 L Huang L Huang L Huang L Huang <br /> MS/MSD <br /> Batch# 6021491 6021491 6021491 6021491 <br /> Date Prepared 2/28/96 2/28/96 2/28/96 2/28/96 <br /> Date Analyzed 2/28/96 2/28/96 2/28/96 2/28/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 <br /> Conc Spiked 20ug/L 20ug/L 20ftg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 85 90 85 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 100 95 98 <br /> Relative% <br /> Difference 11 11 11 11 <br /> LCS Batch# 2LCS022896 2LCS022896 2LCS022896 2LCS022896 <br /> Date Prepared 2/28/96 2/28/96 2/28/96 2/28/96 <br /> Date Analyzed 2/28/96 2/28/96 2/28/96 2/28/96 <br /> Instrument 1 D # HP-4 HP-4 HP-4 HP 4 <br /> LCS% <br /> Recovery 85 90 85 92 <br /> E ° Recovery <br /> Control Limits 71 133 72-128 72-130 71-120 <br /> Please Bate <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 /> lognature 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 /> 6020685 MAD <8> <br />