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u <br /> o� <br /> Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> ,—!D— 404 N W,,,Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)986 9673 <br /> woAnalytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *P[)S 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 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# 5110359 5110359 5110359 5110359 <br /> Date Prepared 11/21/95 11/21/95 11/21/95 11/21/95 <br /> Date Analyzed 11/21/95 11/21/95 11/21/95 11/21/95 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 <br /> Conc Spiked long/L 10pg/L 10pg/L 30pg/L <br /> Matrix Spike <br /> % Recovery 91 136 101 118 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 97 103 102 106 <br /> Relative% <br /> Difference 64 28 099 11 <br /> LCS Batch# LCS112195 LCS112195 LCS 112195 LCS112195 <br /> Date Prepared 11/21/95 11/21/95 11/21/95 11/21/95 <br /> Date Analyzed 11/21/95 11/21/95 11/21/95 11/21/95 <br /> Instrument I D # HP 1 HP-1 HP 1 HP 1 <br /> LCS % <br /> Recovery 98 97 99 101 <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 /> 61griature 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 <6> <br />