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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 9640 FAX(916)921 0100 <br /> �I, F <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 6090769-774 Reported Oct 7, 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 C Westwater C Westwater C Westwater C Westwater I Dalvand <br /> MS/MSD <br /> Batch# 6090417 6090417 6090417 6090417 BLK091796 <br /> Date Prepared 9/25/96 9/25/96 9/25/96 9/25/96 9/17/96 <br /> Date Analyzed 9/25/96 9/25/96 9/25/96 9/25/96 9/17/96 <br /> Instrument I D # HP-4 HP 4 HP-4 HP-4 HP-313 <br /> Conc Spiked 20ug/L 20pg/L 20pg/L 60Ng/L 300pg/L <br /> Matrix Spike <br /> % Recovery 22 18 18 53 108 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 24 19 19 57 110 <br /> Relative % <br /> Difference 87 541 541 7 27 1 8 <br /> LCS Batch# 4LCS092596 4LCS092596 4LCS092596 4LCS092596 LCS091796 <br /> Date Prepared 9/25/96 9/25/96 9/25/96 9/25/96 9/17/96 <br /> Date Analyzed 9/25/96 9/25/96 9/25/96 9/25/96 9/17/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 HP-313 <br /> LCS % <br /> Recovery 22 17 18 53 94 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 50-150 <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 /> Signature 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 /> 6090769 MPD <7> <br />