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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lame 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 />*MPE)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 6111573-581 Reported Dec 9, 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 K Nill K Nil K Nill K Nill <br /> MS/MSD <br /> Batch# 6110808 6110808 6110808 6110808 <br /> Date Prepared 11/26/96 11/26/96 11/26/96 11/26/96 <br /> Date Analyzed 11/26/96 11/26/96 11/26/96 11/26/96 <br /> Instrument I D # HP-2 HP 2 HP 2 HP-2 <br /> Conc Spiked 20pg/L 20ftg/L 20ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 115 115 125 120 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 120 120 130 123 <br /> Relative % <br /> Difference 4 3 43 39 2 7 <br /> LCS Batch# 2LCS112696 2LCS112696 2LCS112696 2LCS112696 <br /> Date Prepared 11/26/96 11/26/96 11/26/96 11/26/96 <br /> Date Analyzed 11/26/96 11/26/96 11/26/96 11/26/96 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> LCS % <br /> Recovery 120 120 130 125 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> Please Nate <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 /> Oignature 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 /> 6111573 MPD <47 <br />