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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 94599 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Straker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> QPDS Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr,Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 5122228-235 Reported Jan 12, 1996 <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 D Sharma D Sharma D Sharma D Sharma <br /> MS/MSD <br /> Batch# 5122408 5122408 5122408 5122408 <br /> Date Prepared 1/3/96 1/3/96 1/3/96 1/3/96 <br /> Date Analyzed 1/3/96 1/3/96 1/3/96 1/3/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Cone Spiked 201ig/L 20ug/L 20Ng/L 60ug/L <br /> Matrix Spike <br /> % Recovery 90 so 85 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 95 95 98 <br /> Relative % <br /> Difference 00 54 11 11 <br /> LCS Batch# 3LCS010396 3LCS010396 3LCS010396 3LCS010396 <br /> Date Prepared 1/3/96 1/3/96 1/3/96 1/3/96 <br /> Date Analyzed 1/3/96 1/3/96 1/3/96 1/3/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 105 105 105 105 <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 /> 61ginature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 5122228 MPD <4> <br />