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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 /> a- ) <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX (916)921 0100 <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 Sarkis Karkarian QC Sample Group 5090207-12 Reported Sep 19, 1995 <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 K Nill K N111 K Nill K Nill J Dinsay <br /> MS/MSD <br /> Batch# 5090211 5090211 5090211 5090211 BLK090795 <br /> Date Prepared 9/12/95 9/12/95 9/12/95 9/12/95 9/7/95 <br /> Date Analyzed 9/12/95 9/12/95 9/12/95 9/12/95 9/7/95 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 GCHP-3A <br /> Conc Spiked 20Mg/L 20Ng/L 20pg/L 60Ng/L 300,ug/L <br /> Matrix Spike <br /> % Recovery 105 110 110 117 63 <br /> 1`10 Matrix Spike <br /> Duplicate% <br /> Recovery 105 110 110 120 67 <br /> Relative % <br /> Difference 00 00 00 28 51 <br /> LCS Batch# 9LCS091295 9LCS091295 9LCS091295 9LCS091295 LCS090795 <br /> Date Prepared 9/12/95 9/12/95 9/12/95 9/12/95 9/7/95 <br /> Date Analyzed 9/12/95 9/12/95 9/12/95 9/12/95 9/8/95 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 GCHP-3A <br /> LCS % <br /> Recovery 90 95 95 100 67 <br /> %Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 38-122 <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 /> Protect Manager <br /> 5090207 MPD <4> <br />