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la Sequoia680 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 /> �„ r <br /> OLDS 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 6121094-096 Reported Dec 30, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Sharma <br /> MS/MSD <br /> Batch# 6121180 6121180 6121180 6121180 BLK121896 <br /> Date Prepared 12/23/96 12/23/96 12/23/96 12/23/96 12/18/96 <br /> Date Analyzed 12/23/96 12/23/96 12/23/96 12/23/96 12/20/95 <br /> Instrument I D # HP-9 HP 9 HP-9 HP-9 HP-3A <br /> Conc Spiked 20Pg/L 20Ng/L 20pg/L 6opg/L 300jig/L <br /> Matrix Spike <br /> % Recovery 105 110 110 116 80 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 110 110 118 63 <br /> Relative % <br /> Difference 00 00 00 14 23 <br /> LCS Batch# 9LCS122396 9LC8122396 9LCS122396 9LCS122396 LCS121896 <br /> Date Prepared 12/23/96 12/23/96 12/23/96 12/23/96 12/18/96 <br /> Date Analyzed 12/23/96 12/23/96 12/23/96 12/23/96 12/20/96 <br /> Instrument I D # HP-9 HP 9 HP-9 HP-9 HP-3A <br /> LCS % <br /> Recovery 110 115 105 120 70 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 60-140 <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 /> 01gnature 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 <7> <br />