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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364-9600 FAX(415)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988-96W FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> WPDS Services Client Project ID Unocal #2859, 1665 Pacific Ave,Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarian QC Sample Group 5080655-63 Reported Aug 24, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst K Nill K Nill K Nill K Nill <br /> MS/MSD <br /> Batch# 5080615 5080615 5080615 5080615 <br /> Date Prepared 8/21/95 8/21/95 8/21/95 8/21/95 <br /> Data Analyzed 8/21/95 8/21/95 8/21/95 8/21/95 <br /> Instrument I D # HP 4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20ug/1- 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 95 95 95 97 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 85 90 90 93 <br /> Relative % <br /> Difference 11 5 4 5 4 35 <br /> LCS Batch# 2LCS082195 2LCS082195 2LCS082195 2LCS082195 <br /> Date Prepared 8/21/95 8/21/95 8/21/95 8/21/95 <br /> Date Analyzed 8/21/95 8/21/95 8/21/95 8/21/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 101 105 106 106 <br /> % Recovery <br /> Control Limits 71-133 72-128 72-130 71 120 <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 recovea is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 5080655 MPD <3> <br />