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.` 4a) Sequoia 680 Chesapeake Drive 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> lie <br /> MPDS Services Client Project ID Unocal #0187, 437 E Miner Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan QC Sample Group 5051049-51 Reported May 24, 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# 5050314 5050314 5050314 5050314 <br /> Date Prepared 5/18/95 5/18/95 5/18/95 5/18/95 <br /> Date Analyzed 5/18/95 5/18/95 5/18/95 5/18/95 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 <br /> Conc Spiked 10ug/L 10ug/L 10 fig/L 30 fig/L <br /> Matrix Spike <br /> % Recovery 99 87 113 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 102 95 111 92 <br /> Relative % <br /> Difference 3 0 8 8 18 00 <br /> LCS Batch# LCS051795 LCS051795 L08051795 LCS051795 <br /> Date Prepared 5/17/95 5/17/95 5/17/95 5/17/95 <br /> Date Analyzed 5/17/95 5/17/95 5/17/95 5/17/95 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 <br /> LCS % <br /> Recovery 92 115 95 101 <br /> ° ecovery <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 /> SE01.101A 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 /> Qgnature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery 1s to be used to validate the batch <br /> Project Manager <br /> 5051049 MPD <3> <br />