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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> ID 404 N Wigct 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 /> OMPDS Services Client Project it) Unocal #6981, 4707 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarian QC Sample Group 5041776-88 Reported May 12, 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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 5041678 5041678 5041678 5041678 <br /> Date Prepared 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Date Analyzed 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Cone Spiked 20ug/L 20pg/L 20frg/L 60pg/L <br /> Matrix Spike <br /> Recovery 95 95 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 95 95 95 <br /> Relative % <br /> Difference 00 00 00 21 <br /> LCS Batch# 3LC8050795 3LCS050795 3LCS050795 3LCS050795 <br /> Date Prepared 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Date Analyzed 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Instrument I D #. HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery. 99 100 98 101 <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 /> Wsignature 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 /> 5041776 MPD <7> <br />