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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 /> Iwo- Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> O <br /> MPDS 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 6080666-677 Reported Aug 26, 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 Z T Z T Z T Z T <br /> MS/MSD <br /> Batch# MS081796 MS081796 MS081796 MS081796 <br /> Date Prepared 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Date Analyzed 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 10ug/L 10ug/L 10Vg/L 30yg/L <br /> Matrix Spike <br /> % Recovery 71 66 65 90 <br /> is Matrix Spike <br /> Duplicate% <br /> Recovery 60 56 56 80 <br /> Relative % <br /> Difference 17 17 15 12 <br /> LCS Batch# LCS081696 LCS081696 LCS081696 LCS081696 <br /> Date Prepared 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Date Analyzed 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> LCS % <br /> Recovery 82 80 85 100 <br /> % Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <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, #1894 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 /> nature 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 is to be used to validate the batch <br /> Project Manager <br /> 6080666 MPD <7> <br />