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A ® Sequoia680 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 /> MPDS Services Client Project ID Unocal #5886, 2701 W March Ln Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6120681-683 Reported Dec 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Sharma <br /> MS/MSD <br /> Batch# 6120681 6120681 6120681 6120681 BLK121396 <br /> Date Prepared 12/19/96 12/19/96 12/19/96 12/19/96 12/13/96 <br /> Date Analyzed 12/19/96 12/19/96 12/19/96 12/19/96 12/13/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 HP-3A <br /> Conc Spiked 20pg/L 20pg/L 20yg/L 60ug/L 300 ug/L <br /> Matrix Spike <br /> % Recovery 85 80 85 80 67 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 95 85 95 85 83 <br /> Relative % <br /> Difference 11 61 11 61 22 <br /> LCS Batch# 5LCS121996 5LCS121996 5LCS121996 5LCS121996 LCS121396 <br /> Date Prepared 12/19/96 12/19/96 12/19/96 12/19/96 12/13/96 <br /> Date Analyzed 12/19/96 12/19/96 12/19/96 12/19/96 12/13/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP 5 HP-3A <br /> LCS % <br /> Recovery 85 80 85 83 87 <br /> % Recovery <br /> Control Limits 60-140 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, #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 /> O'griature 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 /> 6120681 MPD <5> <br />