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V <br /> v� <br /> ' 41)l Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(51o)988 9673 <br /> woAnalytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OPIDS Services Client Project 10 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 5111126-37 Reported Nov 27, 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# 5110386 5110386 5110386 5110386 <br /> Date Prepared 11/22/95 11/22/95 11/22/95 11/22/95 <br /> Date Analyzed 11/22/95 11/22/95 11/22/95 11/22/95 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 <br /> Conc Spiked 10}tg/L 10yg/L 10lig/L 30lig/L <br /> Matrix Spike <br /> % Recovery 93 95 95 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 95 97 99 <br /> Relative% <br /> Difference 1 1 00 21 10 <br /> LCS Batch# - - - - <br /> Date Prepared - - - <br /> Date Analyzed - - - <br /> Instrument I D # - <br /> LCS% <br /> Recovery - - - - <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, #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 /> Ognature 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 /> 5111126 MPD <5> <br />