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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 /> Analytical 819 Sinker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *PDS Services Client project It) 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# 6021227 6021227 6021227 6021227 <br /> Date Prepared 2/22/96 2/22/96 2/22/96 2/22/96 <br /> Date Analyzed 2/22/96 2/22/96 2/22/96 2/22/96 <br /> Instrument I D.# HP 9 HP-9 HP-9 HP-9 <br /> Conc Spiked 20 pg/L 20 ug/L 20}tg/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 110 107 105 108 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 110 102 105 105 <br /> Relative % <br /> Difference 00 47 00 31 <br /> LCS. Batch#: 4LCS022296 4LCS022296 4LCS022296 4LCS022296 <br /> Date Prepared 2/22/96 2/22/96 2/22/96 2/22/96 <br /> Date Analyzed 2/22/96 2/22/96 2/22/96 2/22/96 <br /> Instrument I D.# HP 9 HP-9 HP 9 HP-9 <br /> LCS % <br /> Recovery 110 110 100 110 <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 /> lognature 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 <5> <br />