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Sequoia 660 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1a) Analytical 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> wo819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (9 16) 921 9600 FAX(916)921 0100 <br /> *PD8 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 OC Sample Group 5082062-064 Reported Aug 31, 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# 5081901 5081901 5081901 5081901 <br /> Date Prepared 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Date Analyzed 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20Vg/L 20pg/L 20ug/L 60ug/L <br /> Matrix Spike <br /> %Recovery 100 105 110 108 <br /> iMatrix Spike <br /> Duplicate% <br /> Recovery 100 105 110 108 <br /> Relative% <br /> Difference 00 00 00 00 <br /> LCS Batch# 2LCS082895 2LCS082895 2LCS082895 2LC8082895 <br /> Date Prepared 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Date Analyzed 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS% <br /> Recovery 93 101 105 104 <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 /> ignature 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 /> 5082062 MPD <4> <br />