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Sequoia 660 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 /> WOAnalytical 8t9 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> MPDS 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 5120563-568 Reported Dec 28, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- <br /> ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst I z I z I z <br /> MS/MSD <br /> Batch# 5121431 5121431 5121431 <br /> Date Prepared 12/18/95 12)18195 12/18/95 <br /> Date Analyzed 12/18/95 12/18/95 12/18/95 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg1L <br /> Matrix Spike <br /> % Recovery 127 93 86 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 114 86 86 <br /> Relative% <br /> Difference 11 78 00 <br /> LCS Batch# LC3121895 LCS121895 LCS121895 <br /> Date Prepared 12/18/95 12/18/95 12/18/95 <br /> Date Analyzed 12/18/95 12/18/95 12218/95 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> LCS % <br /> Recovery 112 81 82 <br /> % Recovery <br /> Control Limits 28-167 35-146 38 150 <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 /> oignatufe on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LGS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 5120563 MPD <9> <br />