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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> (1) <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> %0 Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OMP0S Services Client Project ID Unocal #6981, 4707 pacific Ave ,Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6011538-550 Reported Feb 14, 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 N Beaman N Beaman N Beaman N Beaman <br /> MS/MSD <br /> Batch# BLK020796 BLK020796 BLK020796 BLK020796 <br /> Date Prepared 2/7/96 2/7/96 2/7/96 2/7/96 <br /> Date Analyzed 1/31/96 2/7/96 2/7/96 2/7/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Cone Spiked 20pg/L 20lig/L 20{ig/L 60ug/L <br /> Matrix Spike <br /> % Recovery 90 95 95 95 <br />• Matrix Spike <br /> Duplicate % <br /> Recovery 90 90 90 91 <br /> Relative % <br /> Difference 00 54 54 3 6 <br /> LCS. Batch# 2LCS020796 2LCS020796 2LC8020796 2LCS020796 <br /> Date Prepared 2/7/96 2/7/96 2/7/96 2/7/96 <br /> Date Analyzed 2/7/96 2/7/96 2/7/96 2/7/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 105 115 115 115 <br /> % Recovery <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 /> 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 /> 6011538 MPD <6s <br />