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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(4t5) 364 9233 <br /> + 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> a- ) <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *PDS Services Client Project Ib Unocal #2859, 1685 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarlan QC Sample Group 5050373-381 Reported May 19, 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 N Zahedi N Zahedi N Zahedi N Zahedi <br /> MS/MSD <br /> Batch# 5050193 5050193 5050193 5050193 <br /> Date Prepared 5/11/95 5/11/95 5/11/95 5/11/95 <br /> Date Analyzed 5/11/95 5/11/95 5/11/95 5/11/95 <br /> Instrument I D # HP-1 HP-1 HP-1 HP 1 <br /> Conc Spiked 10ug/L 10ug/L 10ftg/L 30ug/L <br /> Matrix Spike <br /> % Recovery 103 104 106 109 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 92 91 95 <br /> Relative% <br /> Difference 91 12 15 14 <br /> LCS Batch# -- -- -- -- <br /> Date Prepared - -- - <br /> Date Analyzed -- - - <br /> Instrument I D # -- <br /> LCS % <br /> Recovery -- <br /> % <br /> - -- -- <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, #2000 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 /> 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 is to be used to validate the hatch <br /> Alan B Kemp <br /> Project Manager <br /> 5050373 MPD <3> <br />