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Sequoia680 Chesapeake Dn,e 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 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> ID <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 6020685-696 Reported Feb 29, 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# 6020694 6020694 6020694 6020694 <br /> Date Prepared 2/23/96 2/23/96 2/23/96 2/23/96 <br /> Date Analyzed 2/23/96 2/23/96 2/23/96 2/23/96 <br /> Instrument I D.# HP-11 HP-11 HP-11 HP-11 <br /> Conc Spiked 20jtg/L 20pg/L 20pg/L 60frg/L <br /> Matrix Spike <br /> % Recovery 115 105 110 113 <br /> is Matrix Spike <br /> Duplicate% <br /> Recovery 115 105 110 115 <br /> Relative% <br /> Difference 00 00 00 15 <br /> LCS Batch# 5LCS022396 51-C8022396 5LCS022396 5LCS022396 <br /> Date Prepared 2/23/96 2/23/96 2/23/96 2/23/96 <br /> Date Analyzed 2/23/96 2/23/96 2/23/96 2/23/96 <br /> Instrument I D # HP-11 HP-11 HP-11 HP 11 <br /> LCS % <br /> Recovery 110 100 105 108 <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 /> 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 /> 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 batch <br /> Alan B Kemp <br /> Project Manager <br /> 6020685 MPD <6> <br />