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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane 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 /> MPDS 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 6071861-872 Reported Aug 7, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> Method EPA 8260 EPA 8260 EPA 8260 EPA 8260 EPA 8260 <br /> Analyst Son Le Son Le Son Le Son Le Son Le <br /> MS/MSD <br /> Batch# 6072134 6072134 6072134 6072134 6072134 <br /> Date Prepared 8/5/96 8/5/96 8/5/96 8/5/96 8/5/96 <br /> Date Analyzed 815196 815196 815196 815196 815196 <br /> Instrument I D # GC/M$2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 <br /> Conc Spiked 50}Ig/L 50 pg/L 50 pg/L 50 jig1L 50 pg/L <br /> Matrix Spike <br /> % Recovery 122 104 42 74 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 131 111 100 106 120 <br /> Relative % <br /> Difference 70 63 7 0 76 6 9 <br /> LCS Batch# LCS080596 LCS080596 LCS080596 LCS080596 LCS080596 <br /> Date Prepared 8/5/96 8/5/96 8/5/96 8/5/96 8/5/96 <br /> Date Analyzed 815196 815196 8/5196 815196 815196 <br /> Instrument I D # GC/MS 2 GC/MS 2 GC/MS 2 GCIMS 2 GC/MS 2 <br /> LCS % <br /> Recovery 105 100 103 98 110 <br /> Recovery <br /> Control Limits 65-135 70-130 70-130 70-130 70-130 <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 /> 0 <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> Signature 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 /> 6071861 MPD 48> <br />