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A� <br /> ti 680 Chesapeake Dnve Redwood City,CA 94063 {415) 364 9600 FAX(415) 364 9233 <br /> Sequoia <br /> r 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(51D)988 9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 111W Analytical <br />%PDS Services Client Project ID Unocal #0123, 1034 Central Ave,Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6121094-99 Reported Dec 30, 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 D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch# BLK122396 BLK122396 BLK122396 BLK122396 <br /> Date Prepared 12/23/96 12/23/96 12/23/96 12/23/96 <br /> Date Analyzed 12/23/96 12/23/96 12/23/96 12/23/96 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> Conc Spiked 20 yg/L 20 Ng/L 20 Ng/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 100 115 110 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 105 100 98 <br /> Relative % <br /> Difference 11 90 95 96 <br /> LCS Batch# 2LCS122396 2LCS122396 2LCS122396 2LCS122396 <br /> Date Prepared 12/23/96 12/23/96 12/23/96 12/23/96 <br /> Date Analyzed 12/23/96 12/23/96 12/23/96 12/23/96 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery 95 105 100 98 <br /> % Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> Please Note <br /> The LCS 1s 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 /> 6121094 MPD <10> <br />